malott's formula

do i needa fly cut if i run a ms3 with prc stage 2.5 5.3 heads

00 black ss

iTrader: (9)

You don't but its always good to measure just incase. And I'm pretty sure you need to have the valves sunk in order for the ms3 to fit

Sales2@Texas-speed

iTrader: (5)

And as a note, the heads MUST be setup originally for the MS3. If you get some used heads that weren't built for the MS3, you'll have clearance issues!

blue99fbody

iTrader: (5)

my pistons had marks on them from the valves with stock heads and ms3

carreras

iTrader: (7)

What would be the biggest cam u could run with those heads if they weren't set up for the MS3?

mastercoryd

iTrader: (3)

not to hijack but i have a stupid noob question... to flycut a piston? what is that process? is it a diy or u have a machine shop do it?

badss_02

iTrader: (2)

You would take them to a machine shop... I am sure you wouldn't have the tools needed to do that.

blue99fbody

iTrader: (5)

buy the tool and diy

SIC GTO

so what do you have to do in order not to have these marks???
I am installing my ms3 on stock heads in 3 weeks!!!

01FbTaWs6

iTrader: (12)

flycut

ZTwentyAteU

iTrader: (12)

I didnt have to flycut on ms3..I don't see how you guys hit the pistons at just over .600 lift on stock stuff. Must be stretching valves!

01FbTaWs6

iTrader: (12)

its not just the lift that is the issue. Its a combination of lift, duration and ICL. Also, whats an acceptable clearance to you? .100 on intake AND exhaust?

Sales2@Texas-speed

iTrader: (5)

It really depends how the heads were setup when originally sold. The best way to find out what you can run comfortably, is to measure the free valve drop (distance the valve travels from its seat until it hits the piston at TDC) on intake and exhaust. Based on those numbers, we can make a recommendation.