Big Block engine swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kissingbug1978 · 10-24-2008, 12:54 AM

How hard is to swap a big block into these trucks. I know that I've seen it before. But just don't know what kind of mounts to use or where to locate them on the frame. And anything else that might be involved. Or potentail headaches.

d10s69c10 · 10-24-2008, 01:06 AM

Beauty of chevy a 4.6 and a 9.3 will fit in the same mounts just about.

simply put no its not that hard if you have a complete motor to drop in.

"common" issues will be radiator Exhaust front springs.

really depends on how stout of a engine you are throwing in, but everything from the back of your crankshaft to your wheel studs could also factor in.

for those who are guessinga 9.3 is a 572. whats a 10.3?

kissingbug1978 · 10-24-2008, 01:43 AM

The engine I'm currently looking at is a 396 with stock internals and the usual bolt-ons(intake,carb, headers and a decent cam). I'm not looking to get to crazy here as my truck is planned to be a daily driver with an automatic overdrive tranny. I guess the question I was trying to ask is, Is it just a matter of changing the mounts and dropping in the engine. Or is it more involved?

leftcoast66 · 10-24-2008, 02:47 AM

Quote:

Originally Posted by kissingbug1978

The engine I'm currently looking at is a 396 with stock internals and the usual bolt-ons(intake,carb, headers and a decent cam). I'm not looking to get to crazy here as my truck is planned to be a daily driver with an automatic overdrive tranny. I guess the question I was trying to ask is, Is it just a matter of changing the mounts and dropping in the engine. Or is it more involved?

Basically is just like swapping smallblocks. Very simple in these trucks. I believe ece or one of those places has some big block mounts, and then the radiator I'm not sure about, but you get the picture. Its simple.

**ChiefRocka** · 10-24-2008, 06:58 AM

Check with CHEVYFLEETSIDE....he is currently working on one on his back-burner.....

kissingbug1978 · 10-24-2008, 08:39 AM

thanks for the info as I've not been able to find it anywhere else on the net.

**Chevy Fleetside** · 10-24-2008, 10:27 AM

Here is my thread so far. You don't have to go as far as cutting the firewall. That was a personal choice. http://67-72chevytrucks.com/vboard/s...d.php?t=259536

BRASSHEAD · 10-24-2008, 12:38 PM

I have a 402 in mine. I cut the fire wall, made the cut out wider and deeper. I also trimmed the frame about 3/4 of an inch and modified my motor mounts to clear the manifolds.

steverino66 · 10-24-2008, 01:38 PM

Here's my 454.
I had to get some 68-72 big block frame mount towers to fit the header on the driver side (#2 tube was hitting the small block tower).
I mounted mine on the forward holes on the frame rails to clear the firewall with teh valve covers. I'll have to have a driveshaft cut to fit. Requires some patience, but it can be done.

BRASSHEAD · 10-24-2008, 03:24 PM

Sorry about the picture still learning.

joeys66pickup · 10-24-2008, 03:41 PM

10.3 is a 632ci? i might be wrong but im sure 604ish is about 10L so somewhere in there (im probably wrong but im only 19 so i usually am

)

10-24-2008, 12:54 AM	#1
kissingbug1978 Registered User Join Date: Feb 2008 Location: San Antonio,Tx Posts: 83	Big Block engine swap How hard is to swap a big block into these trucks. I know that I've seen it before. But just don't know what kind of mounts to use or where to locate them on the frame. And anything else that might be involved. Or potentail headaches. Last edited by kissingbug1978; 10-24-2008 at 12:56 AM.

10-24-2008, 01:43 AM	#3
kissingbug1978 Registered User Join Date: Feb 2008 Location: San Antonio,Tx Posts: 83	Re: Big Block engine swap The engine I'm currently looking at is a 396 with stock internals and the usual bolt-ons(intake,carb, headers and a decent cam). I'm not looking to get to crazy here as my truck is planned to be a daily driver with an automatic overdrive tranny. I guess the question I was trying to ask is, Is it just a matter of changing the mounts and dropping in the engine. Or is it more involved? Last edited by kissingbug1978; 10-24-2008 at 01:45 AM.

10-24-2008, 06:58 AM	#5
ChiefRocka Hollister, CA. Join Date: Sep 2006 Location: Hollister, Ca. Posts: 6,151	Re: Big Block engine swap Check with CHEVYFLEETSIDE....he is currently working on one on his back-burner..... __________________ John What the Heck is that ?? CURRENT BUILDS: 62 BurbMaster Other Builds: My '63 C-10,LWB,CC,BBW '06 HD StrAight Axle Swap Father/Son '67 C-20, LQ9,4L80,Bagged,8-Lugger !!Good Friend Richard's Build AMERICAN CUSTOMS & CLASSICS (831) 630-1965 www.ACCHOLLISTER.com ACC on FACEBOOK "Rest in Peace, Mom & Dad ... I will see you again someday!"

10-24-2008, 08:39 AM	#6
kissingbug1978 Registered User Join Date: Feb 2008 Location: San Antonio,Tx Posts: 83	Re: Big Block engine swap thanks for the info as I've not been able to find it anywhere else on the net.

10-24-2008, 10:27 AM	#7
Chevy Fleetside Registered User Join Date: Sep 2006 Location: San Francisco Posts: 4,783	Re: Big Block engine swap Here is my thread so far. You don't have to go as far as cutting the firewall. That was a personal choice. http://67-72chevytrucks.com/vboard/s...d.php?t=259536 __________________ "A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536

10-24-2008, 01:06 AM	#2
d10s69c10 Built 4 Speed Join Date: May 2008 Location: Geneva FL Posts: 619	Re: Big Block engine swap Beauty of chevy a 4.6 and a 9.3 will fit in the same mounts just about. simply put no its not that hard if you have a complete motor to drop in. "common" issues will be radiator Exhaust front springs. really depends on how stout of a engine you are throwing in, but everything from the back of your crankshaft to your wheel studs could also factor in. for those who are guessinga 9.3 is a 572. whats a 10.3? __________________ 1969 C/10 Short Box: 496/T-56 in worx. "To Be Old And Wise, First You Must Be Young And Stupid" Last edited by d10s69c10; 10-24-2008 at 01:11 AM.

10-24-2008, 12:38 PM	#8
BRASSHEAD Registered User Join Date: Feb 2006 Location: Indiana Posts: 188	Re: Big Block engine swap I have a 402 in mine. I cut the fire wall, made the cut out wider and deeper. I also trimmed the frame about 3/4 of an inch and modified my motor mounts to clear the manifolds. Attached Images Last edited by BRASSHEAD; 10-24-2008 at 03:29 PM.

10-24-2008, 01:38 PM	#9
steverino66 Registered User Join Date: Oct 2005 Location: oklahoma Posts: 663	Re: Big Block engine swap Here's my 454. I had to get some 68-72 big block frame mount towers to fit the header on the driver side (#2 tube was hitting the small block tower). I mounted mine on the forward holes on the frame rails to clear the firewall with teh valve covers. I'll have to have a driveshaft cut to fit. Requires some patience, but it can be done. Attached Images

10-24-2008, 03:24 PM	#10
BRASSHEAD Registered User Join Date: Feb 2006 Location: Indiana Posts: 188	Re: Big Block engine swap Sorry about the picture still learning. Attached Images

10-24-2008, 03:41 PM	#11
joeys66pickup Dr. Frankenstein Join Date: Feb 2008 Location: beaverton,Or Posts: 458	Re: Big Block engine swap 10.3 is a 632ci? i might be wrong but im sure 604ish is about 10L so somewhere in there (im probably wrong but im only 19 so i usually am) __________________ I Wanna Go Fast!!



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