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I just picked up a 454 long block that was in the process of a rebuild. Unfortunately the guy who started the rebuild is no longer with us and I have some figuring out what I am working with. I pulled the numbers off the cast iron heads and found that they are an open chamber head. I ordered some aluminum heads (closed chamber) prior to finding this out because I am new to all this and learning as I go. Hopefully not an expensive lesson. Anyways, after pulling the heads, the pistons that are in the motor are a flat top piston with L2377 030 stamped on the top of the piston. The aluminum heads are a closed chamber and my question is this: Am I able to use the closed chamber aluminum heads with these pistons and still have clearance so I wont bend any valves? Also I am guessing that the connecting rods are stock length. Any feed back would be greatly appreciated. Unfortunately I dont have deep pockets to just have someone build me a motor and am up for the challenge anyways and pretty excited about it. I have seen motors being put together and finally am able to put one together myself. Thanks again for any info in regards to this