need some help with selecting cylinder head Mopar 408

[mopar_persson]

okey I'd rather not replace the pistons in the engine is a bit low on money right now.
can i get some J heads to flow enough? because I think I will get to high compression with RPM cylinder heads.

1fast340= jag ska kolla på nitroz tack så mycke

 

[MoparAnglia]

okey I'd rather not replace the pistons in the engine is a bit low on money right now.
can i get some J heads to flow enough? because I think I will get to high compression with RPM cylinder heads.

1fast340= jag ska kolla på nitroz tack så mycke

Its not really static compression you need to worry about. As Rumblefish said, 11:1 is possible with the fuel you intend to use. Also, a good closed chamber design will generally tolerate more compression than an open chamber when using flat top pistons, regardless of cylinder head material.

 

[mopar_persson]

Its not really static compression you need to worry about. As Rumblefish said, 11:1 is possible with the fuel you intend to use. Also, a good closed chamber design will generally tolerate more compression than an open chamber when using flat top pistons, regardless of cylinder head material.

okay fuel I use is 93 octane, so i can run the engine with 11:1? or should I run it on ethanol? If I use Edelbrock rpm heads should I use the heads with the 65 Combustion chamber volume ? I've heard that I need to have at least 220 cfm flow on the heads to my 408

thanks for all the answers

 

[mopar_persson]

up

 

[IQ52]

okey I'd rather not replace the pistons in the engine is a bit low on money right now.
can i get some J heads to flow enough? because I think I will get to high compression with RPM cylinder heads.

1fast340= jag ska kolla på nitroz tack så mycke

If you have someone who knows what they are doing you can get plenty of flow from the J heads. We have ported the J heads to:

.100".......78 cfm
.200"......139
.300"......187
.400"......232
.500"......270
.600"......292
.700"......298

However, I do not believe you have a big enough camshaft to run 11:1 on pump gas. I think you wil need something in the 260 degrees duration at .050" lift.

 

[66dartman]

The 63cc Edelbrock heads work well on a 408. Since you have a cast crank, I would not build anything too wild, 500 hp is what they are rated for and I think that is an optimistic rating.