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I have an 06 and I've sent the head off for porting and it's not too late to change the valve size. I originally asked for +1mm bit now I am thinking 2mm. What is the difference? Will a +2 be better?
Also have big 3, 11:1 piston, webcam and +3mm throttle body.
 

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I have an 06 and I've sent the head off for porting and it's not too late to change the valve size. I originally asked for +1mm bit now I am thinking 2mm. What is the difference? Will a +2 be better?
Also have big 3, 11:1 piston, webcam and +3mm throttle body.
Which web cam?
Youde likely need to go to a bigger billet throttle body for a +2 head.
Who is doing the porting? They should be able to help you make that decision.
 
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Discussion Starter #3
I have an 06 and I've sent the head off for porting and it's not too late to change the valve size. I originally asked for +1mm bit now I am thinking 2mm. What is the difference? Will a +2 be better?
Also have big 3, 11:1 piston, webcam and +3mm throttle body.
Which web cam?
Youde likely need to go to a bigger billet throttle body for a +2 head.
Who is doing the porting? They should be able to help you make that decision.
CT Racing is doing the work and they are using the 940c cam.
 

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I think I asked my dyno guy this question and he mentioned if in the future you are going to do like a 734 BigBore upgrade then do the +2, but staying stock bore stick to the +1.

Discuss with your porter though and confirm that theory.
 
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