Quote:

I recently saw some flow bench numbers on this site which included flow for 516s and they weren't that bad, probably around 20 cfm less than a later head. While that is 45 hp or so it isn't a deal-breaker as far as I'm concerned. The heads you have should be good for 400+ hp.


to not count the -516 out. It's easy to discard that head for something 'better' when it's someone else's money.

Consider teh '66 440 in a C-body - 350-365 hp depending on LP vs TNT -- with 516 heads.