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I believe the cast iron bellhousings for the 351 engines were built for the 164 tooth flywheel and the aluminum housings (289/302) were typically for the 157/160 tooth flywheel. This has implications for the flywheel, clutch fork, clutch, bell housing plate, and starter. I think either will fit but all parts must be compatible with each setup. There may be some exceptions to the above, but I think its true in most cases. I would guess that the 164/cast iron set up is probably stronger than the aluminum one, but I don't know if must be considered. Back in the 70s, I modified a 164 tooth aluminum marine bellhousing to accommodate both types of flywheels by adding starter bolt holes for the 157 tooth starter position.

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