Performer RPM Cylinder Heads For S/B Chrysler

saskatchewan said

Would these cylinder heads work on a 1965 Mopar 273?
Aluminum Cylinder Heads - Chrysler - Small-Block - Performer RPM - Edelbrock, LLC.
Is the 63 cc chamber too large, hence, compression ratio would be too low? Could I "shave the head" to raise the compression, or, would it be better to swap the pistons?

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No, they will not. Please be aware that the 273 bore is too small for the 2.02/1.60 valves to clear.
In order to use 2.02/1.60 valved heads you will need to have the blocked notched for valve clearance. You will also have to determine the piston height with relationship to the deck. The HP 273 Commando/Charger engine has a positive piston to deck height. If that's the
case you will have to use the Edelbrock 60179 heads. Regardless of this you must notch the block! 65'