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Well I got my long block together now with the LF4 pistons in. Ther were no clearance issues but it will be an interference engine. Even after polishing the combustion chamber to a mirror finish and un shrouding the valves it is making 11:1 compression with a cold engine compression test...

These pistons were designed for another engine 94mm bore that ran 10.2 to 1 compression and 18 psi boost from twin turbos. 24mm wrist pin 31.5 compression ht. 51mm Total ht. rings included. They have steel reinforced ring/piston land support to handle that kind of pressure with durability...

Zander thanks for sharing all of this and great info! You should have put forged pistons with ductile iron rings in it with a slight more compression if you are thinging about boosting. I am in the process of building this now for my GX470. I am using the same rods in mine also. What did it...