sbc to bbc swap questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

liftlawssuck · 10-17-2011, 06:24 PM

I am swapping in a big block to my 79 K10 truck. I have a couple of questions for you all.
Are the steel frame mounts the same?
Are the rubber motor mounts the same?
Also can it fit with tall valve covers and the stock brake booster?
These are just some I have now and I am sure I will have more.
Thanks, Brian

DirtyLarry · 10-17-2011, 07:00 PM

Yes, yes and probably. Stuffing a big block in a square is a piece of cake. Not 100% on tall valve covers though.

b454rat · 10-17-2011, 07:26 PM

covers will be close yes to everything esle been there done that couple times

madcow75 · 10-17-2011, 07:27 PM

I thought steel engine stands small block to big block are different. Rubber mounts are definatley a different part #'s in LMC book.

rome704 · 10-17-2011, 08:23 PM

What are stands? Do you mean mounts?

madcow75 · 10-17-2011, 08:27 PM

stands are the steel part of a motor mount which is attached to the block and the mounts are the rubber mount attached to the frame section

b454rat · 10-17-2011, 08:41 PM

Not the clam shells are the same between TRUCK SBC and BBC. The mounts for a big block are little heavier duty, but not required. I swapped a 468 in my old 78 Malibu and used the stock SBC mounts. If they are shot then replace, but if not don't worry about it.

rome704 · 10-17-2011, 08:43 PM

humm good to go then

liftlawssuck · 10-17-2011, 08:44 PM

Oh that's right. I forgot the mount brackets that bolt to block. Those the same? Earlier I was talking about the mounts that bolt in to the frame that the rubber mounts bolt to.
What about running a fuel return line? Does it matter or not? Anything else? Thanks for the responses, Brian

b454rat · 10-17-2011, 08:46 PM

if it's there run it. If not then don't worry. I know the '54 in my crew had a return line, motor is from an 86. I want to say all motors have a return line, but don't work on them much anymore, loosing interest by the day it seems....

rayfinseats · 10-17-2011, 11:05 PM

Mounts are pretty much the same. In a chevelle the BB mounts wer an inch lower or was it higher? Anyway bolt in.

liftlawssuck · 10-20-2011, 06:36 PM

Thanks for all the help guys. Sounds like just what I thought it was. Anyways 1 more if you don't mind. What headers are you guys running? I was thinking Hedman Elite. I like the shinny look and the ball/socket collector. Price isn't too bad either. Not sure how they would fit. They say they are for 79 K10 with manual. But... My main concern is is on the passenger side where the collector would end then having to bend the pipe real quick to get up over the trans crossmember. I had that problem with my small block. Not that it's a huge problem, I just don't want it to look goofy. Any thoughts?

10-17-2011, 06:24 PM	#1
liftlawssuck Registered User Join Date: Mar 2011 Location: MA Posts: 353	sbc to bbc swap questions I am swapping in a big block to my 79 K10 truck. I have a couple of questions for you all. Are the steel frame mounts the same? Are the rubber motor mounts the same? Also can it fit with tall valve covers and the stock brake booster? These are just some I have now and I am sure I will have more. Thanks, Brian

10-17-2011, 07:00 PM	#2
DirtyLarry Windy Corner of a Dirty Street Join Date: Jun 2003 Location: Pueblo West, Colorado Posts: 2,926	Re: sbc to bbc swap questions Yes, yes and probably. Stuffing a big block in a square is a piece of cake. Not 100% on tall valve covers though. __________________ Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles Instagram

10-17-2011, 07:26 PM	#3
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: sbc to bbc swap questions covers will be close yes to everything esle been there done that couple times __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

10-17-2011, 07:27 PM	#4
madcow75 Registered User Join Date: Jun 2009 Location: Fort Erie , Ontario Posts: 525	Re: sbc to bbc swap questions I thought steel engine stands small block to big block are different. Rubber mounts are definatley a different part #'s in LMC book.

10-17-2011, 08:23 PM	#5
rome704 Registered User Join Date: Feb 2009 Location: NC Posts: 85	Re: sbc to bbc swap questions What are stands? Do you mean mounts? __________________ Roman "LCPL" Planter The Few The Proud The Marines

10-17-2011, 08:27 PM	#6
madcow75 Registered User Join Date: Jun 2009 Location: Fort Erie , Ontario Posts: 525	Re: sbc to bbc swap questions stands are the steel part of a motor mount which is attached to the block and the mounts are the rubber mount attached to the frame section

10-17-2011, 08:41 PM	#7
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: sbc to bbc swap questions Not the clam shells are the same between TRUCK SBC and BBC. The mounts for a big block are little heavier duty, but not required. I swapped a 468 in my old 78 Malibu and used the stock SBC mounts. If they are shot then replace, but if not don't worry about it. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

10-17-2011, 08:43 PM	#8
rome704 Registered User Join Date: Feb 2009 Location: NC Posts: 85	Re: sbc to bbc swap questions humm good to go then __________________ Roman "LCPL" Planter The Few The Proud The Marines

10-17-2011, 08:44 PM	#9
liftlawssuck Registered User Join Date: Mar 2011 Location: MA Posts: 353	Re: sbc to bbc swap questions Oh that's right. I forgot the mount brackets that bolt to block. Those the same? Earlier I was talking about the mounts that bolt in to the frame that the rubber mounts bolt to. What about running a fuel return line? Does it matter or not? Anything else? Thanks for the responses, Brian

10-17-2011, 08:46 PM	#10
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: sbc to bbc swap questions if it's there run it. If not then don't worry. I know the '54 in my crew had a return line, motor is from an 86. I want to say all motors have a return line, but don't work on them much anymore, loosing interest by the day it seems.... __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

10-17-2011, 11:05 PM	#11
rayfinseats Registered User Join Date: Dec 2010 Location: sioux city, iowa Posts: 619	Re: sbc to bbc swap questions Mounts are pretty much the same. In a chevelle the BB mounts wer an inch lower or was it higher? Anyway bolt in.

10-20-2011, 06:36 PM	#12
liftlawssuck Registered User Join Date: Mar 2011 Location: MA Posts: 353	Re: sbc to bbc swap questions Thanks for all the help guys. Sounds like just what I thought it was. Anyways 1 more if you don't mind. What headers are you guys running? I was thinking Hedman Elite. I like the shinny look and the ball/socket collector. Price isn't too bad either. Not sure how they would fit. They say they are for 79 K10 with manual. But... My main concern is is on the passenger side where the collector would end then having to bend the pipe real quick to get up over the trans crossmember. I had that problem with my small block. Not that it's a huge problem, I just don't want it to look goofy. Any thoughts?



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