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Old 07-21-2010, 11:29 PM
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Swaping a TBI to a Daul 4 bbl Carb

Hey guys I love this site. AWESOME Info.
My question is I have a 56 chevy truck project. I bought a 91 GMC for a number of parts including the engine and 5 speed OD. Not wanting to use ANY Computer stuff I want to install this in my project.Besides what I have read already about the boring out the two center holes on the intake and the HEI Dist. and I was thinking of beefing up the cam. Is there anything else I need to be concerned about to make this work. (ie....lifters,rockers,valves,ect,,,)

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Old 07-21-2010, 11:49 PM
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You have swirl port or ramp port heads; not really what you'd want to be running dual fours. If they were Vortecs, then OK. Or even early 70's and older big valve heads.
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Old 07-22-2010, 09:24 PM
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Ok Will this work.. if I have a set of heads on a 79 Scottsdale truck that has a 4 bbl on it now ,Looks factory, will that be ok to use or even be able to bolt them to the 91 block. Also with the bigger cam what mods would I be looking at...I'm not really looking for power to go fast, Just a nice looking show piece that runs good and sounds good LOL just for show
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Old 07-22-2010, 11:34 PM
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What engine? 350 or 454?
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Old 07-22-2010, 11:36 PM
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if its just for show, the TBI heads will be fine. get a intake, bore the center holes out and get yourself an HEI dizzy.

Cause the engine is out of a truck, it SHOULD have a flat tappet cam, So unless you want to upgrade to roller, just buy a new cam/lifter set.
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Old 07-22-2010, 11:37 PM
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Also, the engine MIGHT not have a spot for a mechanical fuel pump, some have it machined others dont. i have had 4 TBI 350's now, only one of them has been machined for fuel pump.
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Old 07-23-2010, 06:12 AM
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Yes well I was planning on a after market electric pump on the frame somewhere. Also it's a 350 I was also thanking of going ahead and changing the oil pump and also the mains & rodds while it is out and easy to get to. I'm not sure of the miles on it.
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Old 07-23-2010, 06:17 AM
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Also yes it's just for show. I am not interested in braking any records down the 1/4 or 1/8 mile track, but would hope it purr's like a kitten on the highway and at idle kinda rocks the ground if you know what I mean.
What size cam would be good for this engine with the 2X4's on it.
And thank's for the replies..
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