dthompson67

whats the biggest valves you can put in gt40x aluminum heads? how much hp do they add usually?

90Lxstanger

Why do you want bigger vavles in those heads, there like 40 horses outta the box( supposably), i would just think haveing the professionally ported realy good would help alot

dthompson67

i wouldnt want to spend the money. and brother said bigger valves will make it run better. and my dad has been a mechanic all his life and knows so much about cars and everything. built his own drag car from scratch and did all work himself. hes currently porting his cobra jet aluminum heads. hes straighting the exhaust ports so the flow more at a straight line then a angle. im gonna have him do it.

90Lxstanger

Sounds like a good deal, yeah i dont know about doin a vavle job on them, be tricky im my eyes