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Old 07-09-2006, 12:40 PM
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BBC In a GMC Sierra - will it fit?

Heres the question for you fellas today.
Sience the engine on my 85 GMC sierra gave up the ghost on me the other day i need a new one.
I have a 396 big block in the chevelle currently, with a 496 in the works.
I was thinking of taking out the big block and swapping it for the little 305 that is currently in the truck.
Im not planning on hammering the car a lot and the engine is nearly stock.
Will this thing even fit?
What changes need to be made for it to work?

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Old 07-09-2006, 12:46 PM
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I believe you could still get those trucks with big blocks in them. You may have to relocate the crossmember for it to fit but the frame may already have provisions in it to do so...
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Old 07-09-2006, 02:00 PM
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I put a 454 in a 79 4x4 and if I remember correctly all we changed was the frame brackets for the motor mounts and the fan shroud. You should be able to get those parts from a GM dealer cause those trucks also came with big blocks.
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Old 07-09-2006, 06:52 PM
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VERY IMPORTANT--be sure to use the tall/wide radiator-
a couple of different sizes were used.
one comes all the way to the top of the core support
the other is 2-3 inches below the top of the core support
My 305 had the tall 2-row radiator so getting to the 4-row was not a problem, but if you have the short radiator and upgrade to the tall one, you will need the upper support/retainer.
get the 454 block mounts---drop 'er in, & rock on

If you do not have air--the biggest prob will be PS mounting and the wiring to the alternator may be too short.

Exhaust---almost forgot

Bryan<<<<<<<<<<<<did this to his 79c-10
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Old 07-09-2006, 08:44 PM
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Uh simply put its a drop in with the current mounts... Everything else bracket wise will have to changed as well as the exhaust and yes of course the radiator...
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