250 to 350 conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NicoSlam · 12-06-2010, 09:56 AM

I just wanted to show the progress I am making in switching my 69SWB from a 250 to a 350. The 250 was original and ran great other then a small flat spot on the monojet between idle and acceleration. I got a good deal on a stock 350 which I have done the following: complete rebuild plus flat top pistons, edelbrock 2102 cam, vortec heads, BS serpenting pullys, SS Headers, Carter AFB 625cfm and all new external components. Also going with an aluminum radiator and dual electric fan setup.

fattyarbuckle · 12-06-2010, 10:27 AM

sweet looking engine there!

Rich916 · 12-06-2010, 12:19 PM

No! Another 250 bites the dust...Ill take that power steering set up.

Jacfourteen · 12-06-2010, 12:45 PM

Both are great looking engines! let us know as you get closer, I can't wait for a video of that beast running.

RCbowtie69 · 12-06-2010, 07:24 PM

I love the pulley set up, who makes it, that the set up i need on my motor, what did they cost u, nice set up, looking good, keep on truckin'',

NicoSlam · 12-06-2010, 07:26 PM

billet specialties produces this as a kit. set you back about $500 but it looks great and everything aligns perfectly.

swamp rat · 12-06-2010, 11:45 PM

Quote:

Originally Posted by NicoSlam

billet specialties produces this as a kit. set you back about $500 but it looks great and everything aligns perfectly.

Got a part number for the kit?

NicoSlam · 12-07-2010, 12:19 PM

Here is the part number directly from billetspecialties: FM2122PC

Ronnny · 12-07-2010, 05:52 PM

Nice swap you have thier. Both the motor out and in looks clean. Myself if i could swap my 68 lwb 350/400 for a straight 6 w/3 on the tree in a minute.

swamp rat · 12-07-2010, 10:57 PM

Quote:

Originally Posted by NicoSlam

Here is the part number directly from billetspecialties: FM2122PC

Thanks for the information!! It will definantly be put on my "do" list..

72BlckButy · 12-06-2010, 08:13 PM

Nice looking update...

brans72 · 01-03-2011, 08:23 PM

I put a 350 in our 67 with 700r4 trans and moved stnds foward (which I got some V8 stands) and driver shaft seeems to fit perfect but yet to start truck.

NicoSlam · 01-04-2011, 10:42 AM

The heads are both 062 (three humps). the single half moon you see on the d-side head is just whats on the opposite end of a 062 head . The 906 has a single hump thats similar.

vasquezmrysvll · 01-04-2011, 01:14 PM

i have the "saw tooth" on both sides of my heads. only way iv ever seen them? also the heads are non-directional.

NicoSlam · 01-04-2011, 02:58 PM

Quote:

i have the "saw tooth" on both sides of my heads. only way iv ever seen them? also the heads are non-directional

I'm not disagreeing with your comment but apparently something alse is going on which may not have anything to do with the heads being 906 or 062. Apparently mine do not have saw tooth marks on both sides of the heads as your do and no literature I have read makes that statement. Maybe I have repos that have both the marks of a saw tooth (062) and the hump of a (906). When I get home, I'll check the casting numbers. That should tell me what I have regardless of shapes etc. I'll post pics this afternoon. Hopefully someone else can chime in.

vasquezmrysvll · 01-04-2011, 03:10 PM

just saying, the saw tooth is more desirable, if your builder advertised "vortecs" you should AT-LEAST get a matching pair, that flow the same numbers. goodluck

12-06-2010, 09:56 AM	#1
NicoSlam Registered User Join Date: Nov 2009 Location: San Antonio TX Posts: 251	250 to 350 conversion I just wanted to show the progress I am making in switching my 69SWB from a 250 to a 350. The 250 was original and ran great other then a small flat spot on the monojet between idle and acceleration. I got a good deal on a stock 350 which I have done the following: complete rebuild plus flat top pistons, edelbrock 2102 cam, vortec heads, BS serpenting pullys, SS Headers, Carter AFB 625cfm and all new external components. Also going with an aluminum radiator and dual electric fan setup. Attached Images

12-06-2010, 10:27 AM	#2
fattyarbuckle Registered User Join Date: Nov 2010 Location: St. Louis Mo. Posts: 282	Re: 250 to 350 conversion sweet looking engine there!

12-06-2010, 12:19 PM	#3
Rich916 Registered User Join Date: Dec 2009 Location: Rancho Cordova, CA Posts: 274	Re: 250 to 350 conversion No! Another 250 bites the dust...Ill take that power steering set up. __________________ 71 Short Step Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=429946

12-06-2010, 12:45 PM	#4
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: 250 to 350 conversion Both are great looking engines! let us know as you get closer, I can't wait for a video of that beast running. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

12-06-2010, 07:24 PM	#5
RCbowtie69 Registered User Join Date: Dec 2003 Location: Thomasville, NC Posts: 1,877	Re: 250 to 350 conversion I love the pulley set up, who makes it, that the set up i need on my motor, what did they cost u, nice set up, looking good, keep on truckin'',

12-06-2010, 07:26 PM	#6
NicoSlam Registered User Join Date: Nov 2009 Location: San Antonio TX Posts: 251	Re: 250 to 350 conversion billet specialties produces this as a kit. set you back about $500 but it looks great and everything aligns perfectly.

12-07-2010, 12:19 PM	#8
NicoSlam Registered User Join Date: Nov 2009 Location: San Antonio TX Posts: 251	Re: 250 to 350 conversion Here is the part number directly from billetspecialties: FM2122PC

12-07-2010, 05:52 PM	#9
Ronnny Registered User Join Date: Aug 2010 Location: newnan Posts: 60	Re: 250 to 350 conversion Nice swap you have thier. Both the motor out and in looks clean. Myself if i could swap my 68 lwb 350/400 for a straight 6 w/3 on the tree in a minute.

12-06-2010, 08:13 PM	#11
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	Re: 250 to 350 conversion Nice looking update... __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)

01-03-2011, 08:23 PM	#12
brans72 Registered User Join Date: Dec 2009 Location: Durham,NC Posts: 636	Re: 250 to 350 conversion I put a 350 in our 67 with 700r4 trans and moved stnds foward (which I got some V8 stands) and driver shaft seeems to fit perfect but yet to start truck.

01-04-2011, 10:42 AM	#13
NicoSlam Registered User Join Date: Nov 2009 Location: San Antonio TX Posts: 251	Re: 250 to 350 conversion The heads are both 062 (three humps). the single half moon you see on the d-side head is just whats on the opposite end of a 062 head . The 906 has a single hump thats similar.

01-04-2011, 01:14 PM	#14
vasquezmrysvll "the other guy" Join Date: Oct 2008 Location: Olivehurst California 95961 Posts: 901	Re: 250 to 350 conversion i have the "saw tooth" on both sides of my heads. only way iv ever seen them? also the heads are non-directional. __________________ God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE" Last edited by vasquezmrysvll; 01-04-2011 at 01:16 PM.

01-04-2011, 03:10 PM	#16
vasquezmrysvll "the other guy" Join Date: Oct 2008 Location: Olivehurst California 95961 Posts: 901	Re: 250 to 350 conversion just saying, the saw tooth is more desirable, if your builder advertised "vortecs" you should AT-LEAST get a matching pair, that flow the same numbers. goodluck __________________ God Said,"Building A 10 Second Import Is Like Coming Out Of The Closet, In The End Ur Still....."EXPLETIVE" Last edited by vasquezmrysvll; 01-04-2011 at 03:10 PM.

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