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Thanks guys.

The heads have been go thru and are working fine. so They will not be changed. If I understand it correctly the 516's cc about 78 is that correct. If so then domed pistons are out.

So a good set of flat tops and try to end up around 10.0 to 1 are in.

Next the HP manifolds I already have along with the flowmaster exhaust from front to back.

I was looking at the e268h comp cam, but on the installation notes it is saying you need to do head work, stock springs are out and you need adjustable valve train. So that would kinda kill the idea of not touching the heads. Although I'm not opposed to taking them apart and relieving an area for clearance issues. Adding better springs and adjustable rocker arms. But I was trying to stay away from doing that.

I also did not want to change the converter unless absolutely necessary.

Thanks for your help so far.

Would love to hear is someone knows the cc's for sure on 516 heads and e268h install stories.

Thnaks again

gary

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As far as the 516 head is concerned with the cc's
run about 78 for sure. If my years is correct on
this head the valve sizes are 2.08 IN/1.60 EX,
(64-67 361/383),closed chamber head. Good cylinder
head, good flowing ports but small exhaust valve.
If you are comfortable with it, it will be fine
but if you are looking to "turn up the wick" a
little, go to the slightly bigger 1.74 exhaust
valve. They were standard on the 67 440 HP head
with closed chambers (915), which are the same as
your 516's but with the larger exhaust valve.
I would run flat top pistons with this head!!
Check with the other member who specs cams, he
IS on his game. Good luck with it and
have fun. 383's like bending the tach needle!!!