TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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Has anybody used the stock, 42mm (or an enlarged 46mm) GM TBI unit on a Holley "Pro-Jection" TBI manifold with 2" bores? If so, what were your results? If you know someone that did, and have a link, please share, I couldn't find anything.
I found a thread in this forum relating to this, but they found another way to solve their problem, thus the question went unanswered.
I want to use aluminum heads with the old 86-earlier style intake holes with TBI. These ProComps seem plentiful and cheap:
I would use a small cam, something between a RamJet cam and a 1705 LT1 cam. These heads are less than $700, and would support plenty more power if I wanted to change cams later.
I am considering drilling the stock manifold or using a single plane manifold that would fit these heads and getting a carb adapter. I'd prefer to have a place for the EGR valve (for visual inspections), even though I don't think the ProComps have EGR crossover, but I acknowledge the gains some have had with single plane manifolds.
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I run the GM 7.4L TBI unit with that Holley manifold. Seems OK for me.
Those heads may be too large at 215 cc. Would require a much larger cam than you are suggesting. 170cc-180cc may be a better choice. Does the seller offer smaller?
Has anyone had success or opinions with ProComp? Who are they and what are they called now?
For a single plane carb manifold a Weiand Accellerator is a good choice.
I run the GM 7.4L TBI unit with that Holley manifold. Seems OK for me.
Those heads may be too large at 215 cc. Would require a much larger cam than you are suggesting. 170cc-180cc may be a better choice. Does the seller offer smaller?
Has anyone had success or opinions with ProComp? Who are they and what are they called now?
For a single plane carb manifold a Weiand Accellerator is a good choice.
Thanks for the input. I did see that they offered a 190cc version of that procomp head, but probably still a little large. They must be plentiful and cheap for a reason, right? So, maybe not the best head. I was also looking into some ZZ4 heads, but may just pony up the dough for the stupid GMPP Vortec intake. I've got modest ambitions, as implied with my cam selection.
