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- - Big block 3 speed combo? (https://67-72chevytrucks.com/vboard/showthread.php?t=333857)

MTCHEVY

03-16-2009 06:48 PM

Big block 3 speed combo?

My 68 has as 6cyl and a 3 speed (Saginaw). The 6cyl needs rebuilt, but the 3 speed is in great shape. I have a good 454 big block, can I drop that in place of the 6 cyl keeping the 3 speed? The reason I ask is that it’s the cheapest way to go V8 and it’s what I have. What are the potential issues any heads up before I tackle it this spring? Thanks

Longhorn Man

03-16-2009 11:00 PM

Re: Big block 3 speed combo?

they did come stock with that combo... but I have no clue what 3 speed was used. Yours may go bad with the quickness

crites_72

12-11-2014 01:27 PM

Re: Big block 3 speed combo?

i know this thread is pretty much dead but will a 454 go in the 6cly spot?

frostbyte

12-11-2014 02:58 PM

Re: Big block 3 speed combo?

The big block will fit, you will need Big Block motor mounts and the frame might need to be trimmed due to the exhaust clearance :gmc2:

enjoy the build

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