Just found out today that there is such a thing as a tbi adapter plate that fits the TBI unit on a four barrel manifold. I have a 91'Rs with the stock 305 block built to the 325 horse motor specs in Car Craft's 305 build it or scrap it mag. I gave my motor a tad more compression and a longer duration cam: Crane 442, 465 cam at 214/224 duration, Vortech heads shaved to 57cc with .0015 inch head gaskets (bring compression to over 10:1), a edelbrock vortech intake, and a road demon 625 cfm carb, HEI setup with full headers and 3inch exhaust and a scoop where the air cleaner sticks out of the hood (similiar to fourth gen SS hood). It runs good, but i don't have a stall converter, just a race shift kit. The f@ckin' carb drives me nuts, I can't get it to blaze off the line without it being too rich. I had this same cam in this block earlier with the stock heads and could mash the pedal and lite up the posi. Should I use this TBI adapter plate and go back to the computer, i know that I can't run this 330hp number with the hypertech chip i've got, no way. Let me know waht you guys know and if anyone has done anything similiar with the vortech head thing.

Thanks, Matt

 

i woudl put the tbi back on with a holley 670cfm tb. shoudl work nicely.
do you have any times with that motor?

later
tim

 

I'm looking at the same thing. I've got a 450ish FWHP 383 sitting in mine and the whole carb thing just drives me nuts. I've got a couple of choices in my garage as far as TBI's go; Holley 670's, Holley 670 base with GM Tower; 454 GM TBI...Hell, I've pretty much got all that I need for a dual TBI system. AND I've got a Haltech to program it with. I just wonder if these options will support the 450 HP. I think option two (with 454 injectors) would be the best bet, but I dunno.

It'd be nice if I had another car to daily drive while I learn to program the Haltech...

Steve

 

if you taek the pair of holley bodies and put the same pressure injectors(it will make tuning a lot easier if you only have to work with 1 injector value) in both it will work great. you woudl even have some room to grow.

later
tim