413 cylinder heads... are these toast??
I always thought it was interesting on Ma Mopar's 1967 383, 325 hp, 10:1 cr, 516 closed chamber head, engine build.
The 516 heads had the small exhaust valves, so to compensate Ma Mopar did a split grind on the stock camshaft, keeping the exhaust valve duration open longer to help in expelling the exhaust gasses from the cylinders.
I always thought it was interesting on Ma Mopar's 1967 383, 325 hp, 10:1 cr, 516 closed chamber head, engine build.
The 516 heads had the small exhaust valves, so to compensate Ma Mopar did a split grind on the stock camshaft, keeping the exhaust valve duration open longer to help in expelling the exhaust gasses from the cylinders.
