When it comes to notching the pistons are there different depths for different applications, or is it a "one size fits all" kinda deal? I've been looking to see when notching becomes necessary but haven't seen anything on how much extra clearance is made.

Also, does stroking the motor effect piston to valve clearance?

One by one I'm putting my pieces together, and want to make sure what i have in mind is correct. BTW this will be for the mach.

Thanks in advance
-chris

 

Only notch the piston as deep as needed. Anything more is pointless and will lower your compression ratio. As far as stroking, it depends. If the piston is brought closer to the deck, then obviously it's closer to the valve so deeper clearances would be needed.

 

I assume you are using "stock" 3cc dished pistons?
You are not going to see a HIGH valve lift from the DOHC heads like you would on the 2V's. The 4V's intake valve curtain area at .500" lift is the same as a 2V at .800". Half an inch lift for the DOHC is considered HIGH lift.

I'm thinking the stock cam lift intake for your car is around .430" and I believe that the Ford GT supercar has cams with an intake lift of .520"

 

pistons will likely be 10cc from livernois's stroker rotating assembly, cam specs are:
comp xe278-114
lift- .475 intake
.450 exhaust
duration at .05- 242 intake
- 240 exhaust