Chamber size??

AdamR said

The intake will fit fine. When you mill the heads they will mill the intake side of the heads also. You will likely need shorter push rods.

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Well i all ready have to get specila pushrods for the magnum heads. How do you know what length pushrods you need if you mill the heads?

also how much will it raise my compression if i mill it? I dont want to take to much off the heads.