Will GT2 Evo cams clear 7.5:1CR, 98mm Max Moritz pistons on a 3.2 (3.4)?

[Tippy]

I have a 3.2 converted to 3.4 using the Max Moritz flat-top pistons. I believe these are 7.5:1CR with 3.2 heads?

Will the GT2 Evo's clear? If not, what should the fly-cut depth be?

They already have divots from my mechanical overrev, so more than likely will already clear.

Just want to make sure if the stars align, and I find a pair.

Second question, is there GT2 and GT2 Evo variants? Any info would be great.

I plan on running sub-7kRPM. Low speed torque is not a concern having a G50.

[Josh D]

Do you have pictures of the pistons?

[Tippy]

Originally Posted by Josh D

Do you have pictures of the pistons?

Hello Josh, this is about the best I have that I can quickly pull:

[Lyle O]

Originally Posted by Tippy

I have a 3.2 converted to 3.4 using the Max Moritz flat-top pistons. I believe these are 7.5:1CR with 3.2 heads?

I just re-did my 3.2 with Max Moritz 98mm pistons, but the CR is 9.8:1. See photo attached. The MM style are not flat; they are technically an asymmetric wedge. FWIW, I am using Web Cams 20/21 grind for my cams, which works well with these pistons.

[Lyle O]

Not sure why my photo did not make it to the last post...

[Tippy]

My MM pistons are pretty flat. No valve reliefs like yours. I cannot tell if your reliefs are below the crown surface or not?

21's have more lift than GT2's according to DRC's.

[Josh D]

Are they made by Mahle? I didn't know MM did a turbo upgrade.

[Tippy]

Originally Posted by Josh D

Are they made by Mahle? I didn't know MM did a turbo upgrade.

Was told they were here either by a symbol or part number

[Ronnie's.930]

Cory, I can't help with your questions, but just wanted to give you props for your hilarious use of the rockers!

Also, not to be an alarmist, but with dents like like put in the piston crowns, wouldn't it be a good idea to have the rods and crank checked for damage (maybe you've already planned on that)?

[Tippy]

Originally Posted by Ronnie's.930

Cory, I can't help with your questions, but just wanted to give you props for your hilarious use of the rockers!

Also, not to be an alarmist, but with dents like like put in the piston crowns, wouldn't it be a good idea to have the rods and crank checked for damage (maybe you've already planned on that)?

Yep, checked them. I also spoke with a couple engineers at work if they thought I was in trouble piston wise. Since the material was compressed, rather than removed, they gave me the go ahead. I was trained on blending high metal on damaged aviation parts in my early career, so I felt confident on making these useable.

BTW, fly-cutting the pistons would have removed material, this method (piston kissing exhaust valves) acted more billet.

If anyone believes opposite, well, I'll be the guinea pig for long term longevity (or catastrophic failure).