Piston Class is in !!

Plymouth 65 said

The Edelbrock Performer RPM 60179 heads are for pistons that are above the deck. I run them on my 273 with the TRW pistons. 65'

Click to expand...

You are correct thats what is confusing about the topic The weird unusual concept they incorporated into the heads surely was done to accept something other than a 10.1 factory style flat top correct ??