Another "recommend a cylinder head?" thread!

I know you guys are going to beat me on the noggin for asking this question again, but I'm a slow learner!

I built my LA 360 with open-chamber "J" heads and too high a compression ratio (10.5:1), back when you could buy better gas, and now it detonates badly on 91 octane no matter what I do. I am sure this is because the J heads don't have enough quench. If I changed to a closed-chamber head, I'd get more quench, right?

Can anybody suggest one? Thanks a lot.


Did you verify the compression ratio or are you just assuming what it is?

Quench won't save you. To actually get the CR you say you have the piston has to be out of the hole .040-.050 unless you milled the heads to death.

You need to consider other things.