[Mattzl1]

Originally Posted by ace32x

Collecting parts currently to throw on the car here shortly. currently have a custom ground cam a 9.1 lower crank pulley, 2.5 upper, solid isolator coupler, some kooks LT's and a kdi heat exchanger and a nick williams 102 TB that will go on when i port the snout.

what im curious about is blower life in the 1900 with the 9.1 lower and the 2.5 upper. im debating porting the heads and doing valves before everything gets put in and as that would lower the boost some since theres less restriction would bumping up the 9.5 lower and having the 2.5 upper significantly increase bearing wear on the blower vs the 9.1 and 2.5 combo?

and what are we seeing failure points on the bottom end of these things stock? i havent heard of one failing yet so im curious

(will be tuning on 92)

There is alot of ZL1's out there with the 2.5 and 9.1 combo and that is just over the recomended max RPM range. Lingenfelter used the 2.5 and 9.5 on the car they were making the 760HP and say they have been using that combo on the CTSV for a while. Lower boost from less restriction doesn't mean less power, it just means more efficient power.