[John Milner]

I run several 428's. I run one that has the factory replacement TRW pistons with a 13cc dish, 670 heads, 1965 tripower, 3:90 gears, 1967 ram air manifolds and a 4 speed. The cam in that engine is a Melling 744. It idles with a slight loap, has very good low end torque and never overheats. I'm really running nothing fancy on this engine. It has stock rockers and the stock 1966 421 points distributor with a good set of points. In my heavy '66 Tempest convertible, it has no trouble burning the tires. I have never run it down a track and do not think I ever will. I would estimate my compression to be just under 10:1. I have only ran 91 octane in the engine and it does not ping.

It would really depend on what pistons are in your engine. If they are flat top, I would run 6x4 heads or something similar. If you have a 13cc dish like a factory 428 piston, I would use the 62 heads. They should have around a 75CC chamber if they haven't been milled.

[bhieb]

Originally Posted by John Milner

I run several 428's. I run one that has the factory replacement TRW pistons with a 13cc dish, 670 heads, 1965 tripower, 3:90 gears, 1967 ram air manifolds and a 4 speed. The cam in that engine is a Melling 744. It idles with a slight loap, has very good low end torque and never overheats. I'm really running nothing fancy on this engine. It has stock rockers and the stock 1966 421 points distributor with a good set of points. In my heavy '66 Tempest convertible, it has no trouble burning the tires. I have never run it down a track and do not think I ever will. I would estimate my compression to be just under 10:1. I have only ran 91 octane in the engine and it does not ping.

It would really depend on what pistons are in your engine. If they are flat top, I would run 6x4 heads or something similar. If you have a 13cc dish like a factory 428 piston, I would use the 62 heads. They should have around a 75CC chamber if they haven't been milled.

Hi John,

Thanks for responding to my post. Your engine sounds a lot like what I'm looking for. To lower the compression ratio, is it advantageous to keep the 62 heads and change pistons because the 62 heads flow/perform better than low compression heads? Or, are there low compression heads that would perform just as well as the 62 heads?

Brad