I recently emailed compcams for a recommendation for my daily driver L98 TPI. It has stock iron L98 heads that have been ported and "cleaned" up a bit. The intake plenum has also been hogged out, along with the TB. I have some SLP runners Im going to put on today too. I also have a TPIS afpr set at 52psi and a custom PROM. When I emailed them I told them all of the mods I have done to the car, including the Hooker LT's, Mufflex Ypipe and dynomax catback. Anyway, their recommendation was a TPI grind, .444lift Int/Exh, 212/218 duration@.050 and a 114 lobe sep angle, 110intake cntr line. Is that too little?? Are they just being conservative? I also noticed in the catalog that the cam is emissions legal, which doesnt mean much to me. I know the TPI doesnt like over .500 of lift stock......but I also read somewhere that the TPI likes high lift with short duration...to build up pressure quicker??? ANy thoughts on this? suggestions???? Im lost ......

 

In my experience, they tend to be conservative with their recommendations. I'm sure they've been burned before for over-camming. They want to be able to suggest a cam that will guaranty performance without problems, so they don't always push the limits. Then again, they understand valve trains and how they affect engine performance.

Just out of curiosity, why are you running 52 PSIG fuel pressure with a custom PROM? You should have been able to size injectors, change the constants, and map the tables to run at a more normal pressure so you don't have to replace pums every year.