Hello,
Can anyone shed some light on the early 68 production 216 cylinder heads?
I have what seems to be original heads to a 400 HO engine
Date code F 27 7 heads 216
Date code G 11 7 block WQ

216s did come on some 68s, have big valves (2.11-1.77) and came on 330hp 400s.

I was thinking about this as well
I have 62 heads on a 69 WZ block I think they are org to that engine not sure

Also I believe these are like 10.75-1 compression ?
Which would be pretty high any advice on fuel other than the 93 premium

I have a set of 62s I've been saving and have some info on them. Looks like 62s were used on GTOs and Grand Prix and some birds. 400 and 428 higher Hp engines. Also used on auto trans cars in lieu of 48s for standards. Factory shows them at 72cc which if correct (have them cc'd to be exact) puts them at the compression you mentioned. I am presently running 72 cc heads (670s) with flat tops and have found 93 octane is not enough to let me time the engine to run its best. Octane booster has been an easy fix for me.
Bottom line... 62s are desirable performance heads with enough octane.

We I build my engine we dished a cup out of the pistons to decrease the compression a little. The compression was suppose to have been lowered to 9.4. Normal driving does fine with my 16 heads. No issues. But if I romp down on the throttle in 2nd you here a little pinging. Never saw any issues with the plugs so there is no bad detonation.

I've tried some of the octane booster to try to eliminate that slight ping and it does not go away. We have some Sunco's here that sale 112 octane racing fuel. If I want to play with the throttle a little, I generally mix two gals of it to a tank and it does real nice.