I have a mild built 440 that has 906 with no port work, well i was planning on buying a set of 440 sources aluminum heads for my engine. But i have 1 3/4 hooker super comps, if i used 440 sources heads would those headers have to go to 1 7/8 or would the 1 3/4 be ok ???
I think for now you'd find they are okay. What is the rest of your combination?
Be careful, or you may encounter an actual performance "loss", by switching to the aluminum head combo from the iron heads.
Like Ghoste says, whats the rest of the combo ?
Bob out.
the aluminum sucks alot of heat out of the combustion chamber. a 9:1 compression ratio will be boarder line on good. 10.5 would be better. plus if the valves are too big compared to your old head you'll lose a bit of power too.
The 1 3/4 headers will work fine.....it might lose a few HP up top but it will make lots of power down low....it really depends on the cam profile and where the power comes in at. For best results you want 10:1 or more compression with the aluminum heads. You can have them milled if the static compression ratio needs to be increased. ;)
What pistons are in this motor ? How far below deck are they ?
Ron
right now my piston are dombed 10.34 comp with 88cc heads ( 906 ).. the cam is a comp magnum 292 dur .501 lift 244@.050 TM-7 intake. The deck height is very close to the factory i made sure i was very conservative when i had this one machined It is bored .30 over
Quote from: mally69 on January 05, 2008, 08:27:59 AM
right now my piston are dombed 10.34 comp with 88cc heads ( 906 ).. the cam is a comp magnum 292 dur .501 lift 244@.050 TM-7 intake. The deck height is very close to the factory i made sure i was very conservative when i had this one machined It is bored .30 over
That will work just fine with the aluminum closed chamber heads. :2thumbs:
Ron
awesome, looks like ill be switching heads as soon as they are released :cheers: :cheers:
stick a supercharger on it, youll make up lots of hp :) afterall aluminum heads are ment for boost
Quote from: Silver R/T on January 05, 2008, 02:36:22 PM
stick a supercharger on it, youll make up lots of hp :) afterall aluminum heads are ment for boost
Thats what my 512 is for ;)
Street stalkers supposedly make on heck of a supercharger