A stock 452 is usually in the 220’s.
Plus the typical untouched 452 chamber is 88-90cc, the stealths are 80-81...... and closed chamber.
Unless you can get machine shop work done pretty cheap, if you’re going to start with an original set of high mileage oe heads....... you’ll probably spend about the same $$ refurbishing the old heads as buying stealths.
I haven’t seen the RPM copy style head available from SM in a while.
The only BB head I’ve seen from them for over a year is the Victor style head.
