Dyno testing a stock(?) 1972 440

Great thread IQ,

I just ported two sets of 516 heads for a 383 and a 413.
The 383 is gonna be high comp and the 413 very low lol.
But after seeing this thread, it’s not all bad news for the
413.
Have done many 516 heads in the past, ‘cheap and cheerful’.
But I never realised till this week, there are DIFFERENT 516 castings!
It seems all the ones I had before were POO till now?
The biggest problem was the crappy exhaust port, and every time you enlarge them, yep you go through into water!
I can’t work out why they is different after all these years?
I have a rusty 66 pair with crap ports.

Now a 64 pair and 65 pair, with what I would call 915 exhaust ports (almost), whooppee.


When folks were saying that 516’s are coolio, I was thinking HOW???

Now totally outta da blue, I have picked up two decent pairs AT Last...