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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 07montecarlo on February 08, 2010, 06:46:13 AM

Title: small block to big block swap/whodunit?
Post by: 07montecarlo on February 08, 2010, 06:46:13 AM
78 shortbed.. will be going solid mounts.are the frames in these truck drilled for big block and small block?? do the mounts just get moved out a tiny bit to comensate for the big block added width or do they do it with mounts??
Title: Re: small block to big block swap/whodunit?
Post by: Captkaos on February 08, 2010, 03:43:49 PM
there is only I6 and V8 locations.  SBC and BBC is the same.
Title: Re: small block to big block swap/whodunit?
Post by: 07montecarlo on February 08, 2010, 05:58:14 PM
are you sure the bb isnt just a tad wider at the mounts??
Title: Re: small block to big block swap/whodunit?
Post by: choptop on February 08, 2010, 06:47:48 PM
I swapped my 350 for a 454, no problems. I used the 454 mounts that were on the block already and just bolted them to the existing mounts on the frame. No problems at all. Problem I had was the donor truck was a 4x4 and mine was a 2wd, so the headers didnt fit from the 4x4. All of the accessories, hoses etc bolted right up. Swapped both engines from one truck to the other on a saturday. I used my original radiator because it was already a 4 core,and the donor truck was a 76 where mine was a 81. Ill never regret the swap. Before and after pics included. The after show a dirty engine, sorry.
Title: Re: small block to big block swap/whodunit?
Post by: Captkaos on February 08, 2010, 09:11:32 PM
are you sure the bb isnt just a tad wider at the mounts??
Yeah, I am 100% sure.  I have swapped a few of these out in the past 20+ years.
Title: Re: small block to big block swap/whodunit?
Post by: 07montecarlo on February 09, 2010, 02:56:28 PM
are you sure the bb isnt just a tad wider at the mounts??
Yeah, I am 100% sure.  I have swapped a few of these out in the past 20+ years.

i trust you, just something from the past is running through my head that said they where like a 1/2" wider, but i think thats from a
78 t/a i did from pontiac 455 to bbc, it was off 1/2"....