Not in an evo i'm assuming a DSM

 

Yes a dsm but evo heads are leaps and bounds better than 1g heads.

 

not really...same exhaust, same combustion chamber, same valve..I haven't seen a leap or a bound better. Maybe for street application the EVO head is way better, but it is really close to the 2G head.

 

Huumm so what's the verdict here. I was thinking of doing some work to my head as far as porting goes. But i don't have anyone in my area that i would trust to do any sort for machining on my head. I guess you won't get any sort of power difference by replacing the valves springs, valves and retainers correct?? just helps with reliability i assume?

 

Just a brief update.

Went 141.8mph on the stock head last night!

 

Update that sig Pat!!!Nice

 

Imho they are as far as core shift and cooling.

 

A GOOD valve job can yeild some minor power gains.

 

So is it safe to say head work should be somewhat the last thing to do?

 

For the amount that head work would cost there is many more effective ways to raise power output.