Straight 6 to SBC ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1ton72GMC · 01-16-2008, 02:51 PM

i have a 72 gmc pickup with the straight 6. what all do i need to do to put a small block v8 into it or will it drop right in? will i need new motor mounts?. how about a big block chevy?

streetstar · 01-16-2008, 03:10 PM

Welcome to the boards !

Whats wrong with the 6? They have a cult-like following now and They're great motors for about everything (except going fast). they look slick with a header, finned valve cover and a sidedraft carb setup

Seriously though -- i dont know all the details, but th topic has been covered before -- maybe you could do a search and find some old threads on it.

try this one

http://67-72chevytrucks.com/vboard/s...ad.php?t=88711

Personally, i'd just keep the 6 over a small block (if it runs well, that is) -- but a big block is a worthwhile swap, or even a new-tech LS series motor if u can find one

1ton72GMC · 01-18-2008, 12:12 AM

Quote:

Originally Posted by streetstar

Welcome to the boards !

Whats wrong with the 6? They have a cult-like following now and They're great motors for about everything (except going fast). they look slick with a header, finned valve cover and a sidedraft carb setup

Seriously though -- i dont know all the details, but th topic has been covered before -- maybe you could do a search and find some old threads on it.

try this one

http://67-72chevytrucks.com/vboard/s...ad.php?t=88711

Personally, i'd just keep the 6 over a small block (if it runs well, that is) -- but a big block is a worthwhile swap, or even a new-tech LS series motor if u can find one

thanks, yea i want to go fast so i want to put 350 in it. anyone else have any details

1969K10 · 01-18-2008, 01:17 AM

You can do the SBC as a straight swap. You will end up with your distributor very close to the firewall, especially if you swap out to HEI. some people move the motor mounts to the "front" location (~1" I believe). but then you have to move the tranny & lengthen the driveshaft.
I would replace the motor mounts while you're doing this swap just because there is no easier time, then when you don't have an engine in the bay...

Putter · 01-18-2008, 01:20 AM

Just a few notes from my memory (I did the same swap)....
Different motor mounts
If changing tranny-different tranny mount
Radiator with tranny cooler ports (optional)
Your RPMs will scream for you to change the gear ratio in the rear.
Different steering column (optional) if going with auto tranny.
Small odds-n-ends will also pop up, so have a few bucks set aside.

01-16-2008, 02:51 PM	#1
1ton72GMC Registered User Join Date: Jan 2008 Location: Currituck Posts: 4	Straight 6 to SBC ?'s i have a 72 gmc pickup with the straight 6. what all do i need to do to put a small block v8 into it or will it drop right in? will i need new motor mounts?. how about a big block chevy?

01-16-2008, 03:10 PM	#2
streetstar Registered User Join Date: May 2007 Location: Moore, Oklahoma Posts: 2,396	Re: Straight 6 to SBC ?'s Welcome to the boards ! Whats wrong with the 6? They have a cult-like following now and They're great motors for about everything (except going fast). they look slick with a header, finned valve cover and a sidedraft carb setup Seriously though -- i dont know all the details, but th topic has been covered before -- maybe you could do a search and find some old threads on it. try this one http://67-72chevytrucks.com/vboard/s...ad.php?t=88711 Personally, i'd just keep the 6 over a small block (if it runs well, that is) -- but a big block is a worthwhile swap, or even a new-tech LS series motor if u can find one __________________ Are you retired too? Nonsense! I'm in my prime Last edited by streetstar; 01-16-2008 at 03:15 PM.

01-18-2008, 01:17 AM	#4
1969K10 Senior Member Join Date: Jul 2004 Location: Clarks Hill, Indiana Posts: 733	Re: Straight 6 to SBC ?'s You can do the SBC as a straight swap. You will end up with your distributor very close to the firewall, especially if you swap out to HEI. some people move the motor mounts to the "front" location (~1" I believe). but then you have to move the tranny & lengthen the driveshaft. I would replace the motor mounts while you're doing this swap just because there is no easier time, then when you don't have an engine in the bay... __________________ 1969 K10 - V8, 465, 205, 12 bolt, D44 2002-current 1969 K20 - V8, 465, 221, Eaton, D44 2012-current Nothin' but drums on all 4 corners! past horses in the stable 72 C10-short step (97-02), 68 C10-long fleet (06-12)

01-18-2008, 01:20 AM	#5
Putter More Cowbell.... Join Date: Mar 2004 Location: Puckett, MS Posts: 3,569	Re: Straight 6 to SBC ?'s Just a few notes from my memory (I did the same swap).... Different motor mounts If changing tranny-different tranny mount Radiator with tranny cooler ports (optional) Your RPMs will scream for you to change the gear ratio in the rear. Different steering column (optional) if going with auto tranny. Small odds-n-ends will also pop up, so have a few bucks set aside. __________________ *There once was a member from Puckett.....Who ( fill in the blank blank blank* ) bucket**



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