Quote:
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?
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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