452 casting heads ???

[mopwr2004a]

I just pulled some heads off a motorhome 440 and it has flat top pistons, and the heads are 452 casting with the 5/8 small tappered seat spark plug. is there any performance advantages between the big plug head and the small plug head. the small plug head valves look big havent pulled them apart to mic the valves yet.

 

[RustyRatRod]

They are about the same as all the other big block heads. They've outflowed 906s in a few comparisons.

 

[magnumdart]

I have about thirty heads and some have hardened valve seats some don't, but I think basically they are all almost identical, except for the closed chambered heads. I doubt in stock form you could even tell the difference just by driving.

 

[mopwr2004a]

ok cool. the main thing i'm looking at with these are the small plugs. bigger selection of heat ranges for tuning. then the 13/16 gasket type plug. maybe i will sit down and start porting on them to replace the 452's I have on the car now. until I can swing a set of aluminum