I recently purchased a MS4 cam and I was hoping I could go to the Junkyard and grab a set of 799/243 heads and send them to TSP to have them port them, only thing is they said the PTV Clearance isn't too good... Would Milling fix this? Or is my only option to go with the 225cc PRC Heads which they suggested due to a great amount of PTV Clearance?

 

Milling makes it WORSE! The valves are then CLOSER to the piston.

 

Yeah milling is gonna make it worse lol

 

Hahaha I guess I still have that newbie in me , Thats what I figured but I figured Id still ask! So sounds like go with the 225cc Heads?

 

Or fly cut the pistons after checking PtV

 

I also thought about that, I try to avoid it because I don't want to pay a machine shop to do that

 

You can do it with cutters from Lindy and a drill

There is a outside chance you may be good on PtV with that cam and stock head gaskets with unmilled heads also

 

 

What LSA is that MS4 cam on?

 

111.5 with 110 ICL

 

I was under the impression people run that cam with stock heads all the time with out issue? I swear I have seen tsp state on her that PTV is fine with stock heads?

 

They can, after rereading they said that the ls6 heads would work with a little clean up milling.