Re: Holley TBI (A New Twist?)
Hey Big Al, in regards to the purchase of the 400cfm holley and an additional spacer, you may find the TBI spacer a plus . I unfortionately have not bored my Intake to match the new TBI unit,instead I am using the Supplied "step down" gasket, but the Increases in HP band have definatly increased. I do plan to bore the Intake manifold to match th TBI bores, as soon as I find out exactly whats the best way to do so. Here is one you may find interesting. I use a Nitrous Oxide system on my 2.8. It is a plate system . The plate provided is around 1/2 to 3/4 " thick and is placed under the TBI. I noticed a improvement in accelleration after I put that on ,that is with the nitrous off. This was with my old Rochester Tbi unit though and because I havent taken it off with the new Tbi , I cant judge wheter it is providing any extra HP now. A spacer on a stock TBI is worth the cash on any 2.8 tBI . The weakest part of the 2.8 engines found in S-10's is the narrow intake manifold and its lack of size. There is very little volume but a TBI spacer adds more capacity.
My s10 also has a crane 2030 compucam, so my increases in power are better than what you should expect, but I still feel this is one Mod you should not overlook. -Will