408Maro

iTrader: (14)

hey all i want to get the ms4 cam from tsp with there ls6 stg1 heads but noticed theres not a big price diff. to get there sgt 2.5 heads only diff is the stg1 is 2.00 I/1.55E and the 2.5 is 2.02I/1.57E. would i have to have anything done to run the sgt 2.5's with my stock internals? thanks

chuckyt1

iTrader: (33)

I don't know about the MS4 but, I run the PRC heads with 2.02 valves and a T Rex cam. I measured the ptv and decided to flycut. Could not be happier... Flycut if you need to, raise the compresion and have some fun...

GMmexican

iTrader: (7)

call Texas speed foo

jmm98LS1

iTrader: (28)

As you increase valve size, the probability that you'll need to flycut your pistons goes up.

Asmodeus

You'll need to flycut with valves any bigger than stock with an MS4. In fact, to get a "safe" clearance on an MS4, you should probably even flycut with stock heads.