spiro27

i have heard alot about the ms3 5.3 2.5 head combo. get higher compresion . has anyone done this combo on an stock ls1. doest this combo have ptv cleaernce problems. or i was also thinking of ms4 ls6 1.0 heads. or ms4 ls5 2.5 heads. same question ad berfore. or will a ms4 and 5.3 2.5 work. i am looking for the setup with the best ptv cleance. or hp i know i cant have both i realy dont want to check ptv clearence or fly cut pistions. thanks for help just trying to decide what combo to get. do you guys have any links to videos for checking ptv cleaence on ls1. what combo would these combo make i have all the suporting mods done to car already headders intake exhaust ect. thanks.
my goal is to make 450rwhp

MYSTIC-1SC

iTrader: (14)

If you run the MS3 with the stage 2.5 5.3 heads from TSP they set the heads up to allow clearance for your cam, but your best bet to go over various combos is to give Texas Speed a call and they can get you the info you need.

earmuffs

You will need to check PTV clearence. Or you can tear apart your bottom end when all hell breaks loose.

MYSTIC-1SC

iTrader: (14)

And yes you should always check PTV clearance to make sure.