GT40 aluminum Y303 or thumper ported.

[Mark89coupe]

I found GT40 aluminum Y303 heads for 699 a set. Are these better flow and a better head in general than the ported thumper heads besides being much lighter?
Does anyone have these heads?
What cam do you use?
How much HP does your combo produce?

 

[Rick 91GT]

Personally I would take almost any alum head over any stock head ported or not...it will give you more room to grow in the future.

 

[Mark89coupe]

Im mostly looking for street power very fast off the line. The thumper heads seem great for that. If I go with the GT40's and a bigger cam will it make all of its power above 3000 rpms?

 

[NKau]

Im mostly looking for street power very fast off the line. The thumper heads seem great for that. If I go with the GT40's and a bigger cam will it make all of its power above 3000 rpms?

The GT40Y's are a true street head; should not shift your powerband. The cam will be what determines where your engine makes it's hp/tq.