changing heads from d2te to edelbrock rpm

[brownd019]

what will happen with the compression ratio by changing from my current stock d2te heads to edelbrock performer rpm 72cc heads on my 390. What kind of power gains can I expect and what other info might be useful in doing this swap

Thanks

[amish77]

Edelbrock doesn't tell you?

[Ford428CJ]

the Q is what cc are your ole D2 heads (have they been milled?)? As for performance with the ED Heads out of the box might be a little better. Get them ported and you will notice a world of difference. Make sure you got a good intake to go with it! JMO

[baddad457]

Have the Ed heads milled about .020 and you won't see much of a drop in compression. There's only a nominal 4 cc difference here. (68-72 vs 72)