Aluminum heads roller cam

[DAVID GAGNARD]

Originally Posted by ender2664

I am currently looking at turn key crate motors ranging from 289-383ci and 370-420hp and most have a roller option. I know the difference between roller and flat in theory but have never owned either.
as for aluminum heads....they just lower weight and dissipate heat better, correct?

Yes and no........Generally speaking aluminum heads will flow better than say a stock cast iron head,but there is a difference in aluminum heads as there is a difference in stock heads..........for instance,Eldlebrock makes 4 or 5 or more small block Ford aluminum heads.....difference is runner size and valve size....flow rates vary also.....

are the heads stock??? have they been ported/polished or otherwise altered from box stock??? makes a difference....

Strictly speaking of swapping out heads,lets use a stock 302 Mustang GT engine,you would gain from 20 to possibly 50 hp with a head swap,depending on the head you are using.......

engine specs will have a lot to do with the hp gain,,,stock engine will gain hp, a modified engine would typically gain more hp because it has more potential to gain hp than a stock engine....

no easy answer unless you had all the specs to consider...

David