350 Engine Position (Long ? sorry) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brownk · 11-16-2005, 02:36 PM

Hey Everyone I need some advice. I just installed a 350 and R4 700 in my 72 Chev pu 2wd stock 250 6cyl with three in the tree. I used stock V8 motor mounts in the holes drilled in the frame to match and it seems that the engine is too far forward. Unfortunately I do not have pictures but it is approx 4-5 inches from the firewall and so close to my new 4 core rad that I will have to put electric fans if I keep it in the present location. The drive shaft fits nicely but I don't want to throw the geometry off too much. Any mbrs with advice or past experience?

chevybill · 11-16-2005, 02:58 PM

do you have any means to post pictures?

brownk · 11-16-2005, 03:02 PM

I may have to re submit this thread with pics on the week-end because I am going back to work on it. Right now I am about 4 hours away from my garage...unfortunatrly I have to work when I would rather be working on my truck!

72MARIO · 11-16-2005, 05:05 PM

Where in canada are you ?

Are you using a long water pump ? That would be my guess as to where your problems started. If the motor mounts were 6 cyl frame mounts that shoulf set the motor back farther than stock. If you get a short water pump you will be able to use the stock fan. Unless you want electric fans.

brownk · 11-16-2005, 05:11 PM

I am living in Edmonton but the truck is in Saskatoon.

I am using a long water pump. I am sure it will fit if I use electric fans but I am not sure if I am going to run into any other problems having the engine further forward. I don't understand how this could have happened in the first place. I was sure that if I put the V8 engine mounts onto the pre drilled holes in the frame that the engine would have been in the right position. Weird....

fastwillie 696969 · 11-16-2005, 07:21 PM

needs pictures

brownk · 11-16-2005, 07:36 PM

I hear you....

I will re post this thread after I get some pics this week-end.

But until then is there anyone out there that has done the swap from a 250 to a 350 that has run into this problem? Or a mechanic that would know whether there will be any issues with an engine position that is further forward then usual? (other then fan clearance)

Green Machine · 11-16-2005, 08:06 PM

Below pics are of the drivers side - The first pic is the 2wd V8 in the correct postion, second pic is same mount in the rear 6 banger or 4WD position, as you can see, the bottom bolt won't line up with anything if its in the wrong position. Hope that helps.....

**john** · 11-16-2005, 08:06 PM

I have the engine towers in the correct position(front holes) with long pump, clutch fan and four core rad. and I have 2 1/2" between clutch and rad. Probably a little less from the fan. I did shorten the shroud by 1 1/4" john

Tx Firefighter · 11-17-2005, 07:28 AM

If you have the engine in the front set of holes, it is indeed in the correct position. You just have to remember, these trucks used short water pump through 72. If you want it "correct", you're going to have to swap your long pump stuff for short pump stuff.

**truckdude239** · 11-17-2005, 10:50 AM

sounds like u need to switch the long pump for and short pump

brownk · 11-17-2005, 11:15 AM

Thx guys,

It appears as though I have the mounts in the correct location but the distributor is quite far from the firewall. This is really puzzeling to me. I will get some pics uploaded ASAP.

Short water pump sounds fine.... Do you guys forsee any issues with the engine being further ahead on the front axle? The harmonic balancer on my brothers 70 shortbox is inline with the drag bar and mine is about an 1.5-2 inches forward of that.

Kurtis

Jim_PA · 11-17-2005, 11:27 AM

So, you can't run a long water pump setup on these things without using an electric fan?

I just read John's reply, and it sounds like he is using a long pump setup without any problems.

Tx Firefighter · 11-17-2005, 01:08 PM

A long pump setup works fine if you mount the engine in the rear set of holes, like a 6 cylinder was originally.

Professor · 11-17-2005, 03:16 PM

Just a thought, but are the engine mount towers reversed? Does the one you have on the driver's side belong on the passenger side, and vice versa?

brownk · 11-17-2005, 03:35 PM

For me they only fit in the holes one way so I don't think so...

But nothing would surprise me now...

Thx Kurtis

crazy longhorn · 11-17-2005, 07:26 PM

You absolutely can not mount those stand bas ackwards, & get them to fit all 3 factory holes(as already mentioned). you need the short waterpump & pulleys/ect to get the fan in the proper spot. Yes, sb V8 position does put the dist a long way from the firewall! I like to mount my sb v8's in the I 6 (250) spot......or same as the 4wd. A small cap dist works best for the swap, although the HEI will fit. where you are right now, I wouldnt move the eng......just get the proper pcs on front

L

brownk · 11-17-2005, 07:50 PM

Thx....sounds like I will have less work to do.

Kurtis

Geezer · 11-17-2005, 10:45 PM

My 67 GMC was a V6. When I put the 350 in it, I tried to use the factory frame holes but the one-piece drive shaft is too short, and Th 400 mounts wouldn’t line up. I bolted the tranny in place with the drive shaft, bolted the engine to the tranny, and then drilled new holes for the engine stands. Using an early points distributor, I can’t quite get two fingers between the firewall and distributor cap.

**john** · 11-23-2005, 08:47 PM

I got this pic from palf70step thread and this has a long pump and plenty of room. John

Tx Firefighter · 11-23-2005, 10:29 PM

Quote:

Originally Posted by john

I got this pic from palf70step thread and this has a long pump and plenty of room. John

He's using 73-87 engine mounts in that picture. The engine is mounted further back than "correct" 67-72 SBC mounting.

**Palf70Step** · 11-23-2005, 11:44 PM

Quote:

Originally Posted by Tx Firefighter

He's using 73-87 engine mounts in that picture. The engine is mounted further back than "correct" 67-72 SBC mounting.

Thanks for the info. I wasn't sure what they did, who ever changed this from a 6 to 8.

mxman · 11-24-2005, 12:08 AM

the 350 in my 68 910 is like 4.5 inches back in the frame, almost touching the firewall, hello longtubes

**Boog** · 11-24-2005, 10:17 AM

There appears to be a number of different mounts, brackets and mounting hole combos that will work on these trucks to locate the engine in the desired position. Most recent is Palf's newest purchase using the 73-87 engine mounts. First I've seen of that combo.
My setup on the 69 is 67-72 small block brackets bolted in the front set of frame holes and the t350 mount bolts right up to the trans crossmember in the stock location. The driveshaft was the wrong length however ( truck was originally 6 cyl/ 3 speed ) so I had to buy another one.
The Dynomax headers didn't fit without massaging, a good bit. The left side wouldn't clear the lower control arm frame bracket and the right side wouldn't clear the engine mount tower. Looked like the engine needed to go in the rear set of holes but that would require drilling new holes for the trans xmember and a shorter drive shaft. I give up. I'm going with some renewed rams horn manifolds. It'll give me more working room in there anyway. I bought a set a while back.
As far as the 73 up front mount accessories on mine it has plenty of room between the fan clutch/blades and the 4 row radiator.

mxman · 11-24-2005, 07:22 PM

I guess i will have to post some pics of my truck now...

11-16-2005, 02:36 PM	#1
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	350 Engine Position (Long ? sorry) Hey Everyone I need some advice. I just installed a 350 and R4 700 in my 72 Chev pu 2wd stock 250 6cyl with three in the tree. I used stock V8 motor mounts in the holes drilled in the frame to match and it seems that the engine is too far forward. Unfortunately I do not have pictures but it is approx 4-5 inches from the firewall and so close to my new 4 core rad that I will have to put electric fans if I keep it in the present location. The drive shaft fits nicely but I don't want to throw the geometry off too much. Any mbrs with advice or past experience?

11-16-2005, 02:58 PM	#2
chevybill Senior Member Join Date: Oct 2004 Location: calhoun city ms Posts: 940	Re: 350 Engine Position (Long ? sorry) do you have any means to post pictures? __________________ ongoing 1970 c 10 lwb 1994 z-28 few mods.-owned since new 1978 vette silver/grey 25th anniv. paint

11-16-2005, 03:02 PM	#3
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	Re: 350 Engine Position (Long ? sorry) I may have to re submit this thread with pics on the week-end because I am going back to work on it. Right now I am about 4 hours away from my garage...unfortunatrly I have to work when I would rather be working on my truck!

11-16-2005, 05:05 PM	#4
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: 350 Engine Position (Long ? sorry) Where in canada are you ? Are you using a long water pump ? That would be my guess as to where your problems started. If the motor mounts were 6 cyl frame mounts that shoulf set the motor back farther than stock. If you get a short water pump you will be able to use the stock fan. Unless you want electric fans. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

11-16-2005, 05:11 PM	#5
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	Re: 350 Engine Position (Long ? sorry) I am living in Edmonton but the truck is in Saskatoon. I am using a long water pump. I am sure it will fit if I use electric fans but I am not sure if I am going to run into any other problems having the engine further forward. I don't understand how this could have happened in the first place. I was sure that if I put the V8 engine mounts onto the pre drilled holes in the frame that the engine would have been in the right position. Weird....

11-16-2005, 07:21 PM	#6
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: 350 Engine Position (Long ? sorry) needs pictures __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

11-16-2005, 07:36 PM	#7
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	Re: 350 Engine Position (Long ? sorry) I hear you.... I will re post this thread after I get some pics this week-end. But until then is there anyone out there that has done the swap from a 250 to a 350 that has run into this problem? Or a mechanic that would know whether there will be any issues with an engine position that is further forward then usual? (other then fan clearance) __________________ 72 Chev Custom Fleetside 2wd, 350 mild performance rebuilt crete .20 over, flat top KB pistons, stock crank, 74cc heads, Edelbrock cam, HEI, 1987 rebuilt R4 700, 20" Eagle rims with cooper 275 45 20's, and a whole lot of body work left to do. My Grandpa bought the truck new and it has worked hard for 33 years. It will now be starting its new life as a street machine and show truck. Last edited by brownk; 11-16-2005 at 07:36 PM.

11-16-2005, 08:06 PM	#8
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: 350 Engine Position (Long ? sorry) Below pics are of the drivers side - The first pic is the 2wd V8 in the correct postion, second pic is same mount in the rear 6 banger or 4WD position, as you can see, the bottom bolt won't line up with anything if its in the wrong position. Hope that helps..... Attached Images __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 11-16-2005 at 08:09 PM.

11-16-2005, 08:06 PM	#9
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: 350 Engine Position (Long ? sorry) I have the engine towers in the correct position(front holes) with long pump, clutch fan and four core rad. and I have 2 1/2" between clutch and rad. Probably a little less from the fan. I did shorten the shroud by 1 1/4" john __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

11-17-2005, 07:28 AM	#10
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: 350 Engine Position (Long ? sorry) If you have the engine in the front set of holes, it is indeed in the correct position. You just have to remember, these trucks used short water pump through 72. If you want it "correct", you're going to have to swap your long pump stuff for short pump stuff. __________________ I'm on the Instagram- @Gearhead_Kevin

11-17-2005, 10:50 AM	#11
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: 350 Engine Position (Long ? sorry) sounds like u need to switch the long pump for and short pump __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

11-17-2005, 11:15 AM	#12
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	Re: 350 Engine Position (Long ? sorry) Thx guys, It appears as though I have the mounts in the correct location but the distributor is quite far from the firewall. This is really puzzeling to me. I will get some pics uploaded ASAP. Short water pump sounds fine.... Do you guys forsee any issues with the engine being further ahead on the front axle? The harmonic balancer on my brothers 70 shortbox is inline with the drag bar and mine is about an 1.5-2 inches forward of that. Kurtis __________________ 72 Chev Custom Fleetside 2wd, 350 mild performance rebuilt crete .20 over, flat top KB pistons, stock crank, 74cc heads, Edelbrock cam, HEI, 1987 rebuilt R4 700, 20" Eagle rims with cooper 275 45 20's, and a whole lot of body work left to do. My Grandpa bought the truck new and it has worked hard for 33 years. It will now be starting its new life as a street machine and show truck.

11-17-2005, 11:27 AM	#13
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: 350 Engine Position (Long ? sorry) So, you can't run a long water pump setup on these things without using an electric fan? I just read John's reply, and it sounds like he is using a long pump setup without any problems. Last edited by Jim_PA; 11-17-2005 at 11:30 AM.

11-17-2005, 01:08 PM	#14
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: 350 Engine Position (Long ? sorry) A long pump setup works fine if you mount the engine in the rear set of holes, like a 6 cylinder was originally. __________________ I'm on the Instagram- @Gearhead_Kevin

11-17-2005, 03:16 PM	#15
Professor Registered User Join Date: Mar 2001 Location: Fayetteville, Arkansas Posts: 160	Re: 350 Engine Position (Long ? sorry) Just a thought, but are the engine mount towers reversed? Does the one you have on the driver's side belong on the passenger side, and vice versa?



Register or Log In To remove these advertisements.

11-17-2005, 03:35 PM	#16
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	Re: 350 Engine Position (Long ? sorry) For me they only fit in the holes one way so I don't think so... But nothing would surprise me now... Thx Kurtis __________________ 72 Chev Custom Fleetside 2wd, 350 mild performance rebuilt crete .20 over, flat top KB pistons, stock crank, 74cc heads, Edelbrock cam, HEI, 1987 rebuilt R4 700, 20" Eagle rims with cooper 275 45 20's, and a whole lot of body work left to do. My Grandpa bought the truck new and it has worked hard for 33 years. It will now be starting its new life as a street machine and show truck.

11-17-2005, 07:26 PM	#17
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: 350 Engine Position (Long ? sorry) You absolutely can not mount those stand bas ackwards, & get them to fit all 3 factory holes(as already mentioned). you need the short waterpump & pulleys/ect to get the fan in the proper spot. Yes, sb V8 position does put the dist a long way from the firewall! I like to mount my sb v8's in the I 6 (250) spot......or same as the 4wd. A small cap dist works best for the swap, although the HEI will fit. where you are right now, I wouldnt move the eng......just get the proper pcs on front L __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

11-17-2005, 07:50 PM	#18
brownk Registered User Join Date: Nov 2005 Location: Canada Posts: 20	Re: 350 Engine Position (Long ? sorry) Thx....sounds like I will have less work to do. Kurtis __________________ 72 Chev Custom Fleetside 2wd, 350 mild performance rebuilt crete .20 over, flat top KB pistons, stock crank, 74cc heads, Edelbrock cam, HEI, 1987 rebuilt R4 700, 20" Eagle rims with cooper 275 45 20's, and a whole lot of body work left to do. My Grandpa bought the truck new and it has worked hard for 33 years. It will now be starting its new life as a street machine and show truck.

11-17-2005, 10:45 PM	#19
Geezer Registered User Join Date: May 2005 Location: Spring Branch Texas Posts: 177	Re: 350 Engine Position (Long ? sorry) My 67 GMC was a V6. When I put the 350 in it, I tried to use the factory frame holes but the one-piece drive shaft is too short, and Th 400 mounts wouldn’t line up. I bolted the tranny in place with the drive shaft, bolted the engine to the tranny, and then drilled new holes for the engine stands. Using an early points distributor, I can’t quite get two fingers between the firewall and distributor cap. __________________ If you can't drive it park it! If you can't park it milk it!

11-23-2005, 08:47 PM	#20
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: 350 Engine Position (Long ? sorry) I got this pic from palf70step thread and this has a long pump and plenty of room. John Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

11-24-2005, 12:08 AM	#23
mxman Registered User Join Date: Mar 2004 Location: Saskatoon sk Posts: 20	Re: 350 Engine Position (Long ? sorry) the 350 in my 68 910 is like 4.5 inches back in the frame, almost touching the firewall, hello longtubes

11-24-2005, 10:17 AM	#24
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,575	Re: 350 Engine Position (Long ? sorry) There appears to be a number of different mounts, brackets and mounting hole combos that will work on these trucks to locate the engine in the desired position. Most recent is Palf's newest purchase using the 73-87 engine mounts. First I've seen of that combo. My setup on the 69 is 67-72 small block brackets bolted in the front set of frame holes and the t350 mount bolts right up to the trans crossmember in the stock location. The driveshaft was the wrong length however ( truck was originally 6 cyl/ 3 speed ) so I had to buy another one. The Dynomax headers didn't fit without massaging, a good bit. The left side wouldn't clear the lower control arm frame bracket and the right side wouldn't clear the engine mount tower. Looked like the engine needed to go in the rear set of holes but that would require drilling new holes for the trans xmember and a shorter drive shaft. I give up. I'm going with some renewed rams horn manifolds. It'll give me more working room in there anyway. I bought a set a while back. As far as the 73 up front mount accessories on mine it has plenty of room between the fan clutch/blades and the 4 row radiator. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-24-2005, 07:22 PM	#25
mxman Registered User Join Date: Mar 2004 Location: Saskatoon sk Posts: 20	Re: 350 Engine Position (Long ? sorry) I guess i will have to post some pics of my truck now...

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Register or Log In To remove these advertisements.