Don Nguyen

iTrader: (2)

What's the recommended amount to fly cut / valve relief the top of the pistons when running an LS3 head to be safe to run any cam later on?

Also, the pistons that are in the block I have already have some fly cutting done. What is the best way to measure how much or how deep it's been cut already?

thanks.

-Don

gotjuice?

iTrader: (5)

It depends on the cam,you don't want to go crazy cutting away
Get your cam,check ptv clearances and then do it

Don Nguyen

iTrader: (2)

I see. Any advice on how to check how much my current pistons have already been fly cut to?

-Don

Tainted

iTrader: (9)

Use modeling clay to make an impression and measure off that

WKMCD

iTrader: (2)

It really depends how much overlap the cam your running has. Do you know?

Don Nguyen

iTrader: (2)

No idea on cam yet. Just seeing if there was a standard depth on fly cutting the heads.

I suppose I just have to measure the depth that they are fly cutted to now and go from there.

Tainted

iTrader: (9)

yup you should, you cant flycut stock pistons but so much

Don Nguyen

iTrader: (2)

Any other suggestions on how to measure without using modeling clay?

Tainted

iTrader: (9)

no, thats the way I wouldve done it. im sure someone else has another way.

Mighty Whitey

You could always use the end of a set of dial calipers and measure from the piston face to the deepest point of the relief (middle of the "eyebrow")

That's about as scientific of a way as using modeling clay, And measuring I suppose..