Is a TB from a 454 worth it on a 4.3L?

I'm getting ready to stick my Edelbrock TBI intake manifold on my 4.3L TBI ('91 issue) over the next month or so. Hopefully I'll get rid of a few of the "might as well"s while I'm at it, like replacing the old lifters. Would
it be worth it to bore out the intake to fit a 454 throttle body before I bolt 'er in? I don't have any head work planned but I do have a set of headers installed so he's not choked too much (Jimmy is definitely a "he"). A cam isn't totally out of the question, nor are 1.6 rockers (I'd hate to have to replace my valve springs though). Any opinions?
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Would
"he").
Nope, not worth the effort for many reasons....................too lazy right now to type them all out!
Doc

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if you are going to use a 454 tbi, you could have stolen the adapter plate too and used it on a spreadbore 4.3 intake. early 454's had q-jet intakes w/a adapter plate to accept tbi units. -pete
Is a TB from a 454 worth it on a 4.3L? Group: alt.autos.4x4.chevy-trucks Date: Sat, Apr 17, 2004, 5:37pm From: snipped-for-privacy@sympatico.remove.ca (SBlackfoot) I'm getting ready to stick my Edelbrock TBI intake manifold on my 4.3L TBI ('91 issue) over the next month or so. Hopefully I'll get rid of a few of the "might as well"s while I'm at it, like replacing the old lifters. Would it be worth it to bore out the intake to fit a 454 throttle body before I bolt 'er in? I don't have any head work planned but I do have a set of headers installed so he's not choked too much (Jimmy is definitely a "he"). A cam isn't totally out of the question, nor are 1.6 rockers (I'd hate to have to replace my valve springs though). Any opinions?
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IMHO.....you should do your homework friend. chances are that 1.6:1 rockers and a hi-lift cam will cause coil bind with stock heads, so maybe head-work should be on your list. Don't do anything that will slow down the airflow thru the motor such as installing a 7.4 litre throttle body on a 4.3 litre engine. Shoot for .480" lift on the intake/exhaust with the 1.6:1 rockers installed. you may have to machine the pushrod guide slots in the heads because the 1.6:1 rockers are longer than 1.5:1 rockers and may cause the pushrods to hit during max lift. Years ago i built a torqy little 229 cid motor using a off-road cam, small-tube hedders, 390cfm carb and single-plane intake.....sleeper.
--
Mad Dog

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installed.
Actually this is part of the homework I've been doing for months...
I meant a cam or the 1.6 rockers, definitely not both. The rockers would just be an easy way out of a cam swap. I'd hate to have to tear it down that far. Ideally I want the Edelbrock bolt-on setup (intake, cam, headers) but the 1.6 rockers should be enough with the factory cam to keep me happy.
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