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For those of you that have had your 3.1 heads P&P, how much did you pay if you went to a machine shop? What kind of angle job did you have done?
 

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i charge 700 canadian for full port and polish, 3 angle valve job and a resurface. also that includes bead blasting and cleaning of the heads.
 

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darkz24 said:
I charge 1240$CDN, includes new seals, titanium retainers and flow sheet.
hey Mev what do you usally get on the exaust side for #'s on the gen II heads?
 

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Let me think what mine cost....

275.00 for the quite radical port and polish
68.00 per head for rebuild

I can't remember what the teflon valve guide seals and bronze guides cost me, putting on the 1.455" dual coil 450 lb springs, spring cups, and stainless steel valves........

You should be able to find a good local machine shop to do the necessary rebuild and they should have a hook up for port and polish work.
 

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don't let anyone BS you the ONLY way to properly regrind valves and seats is a "3 angle valve job" no performance gain there...it is to properly make the valve "face" seal against the valve "seat"(in the head) it must be done for heads to be properly reconditioned
 

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I disagree. The only angle that matters for properly sealing the valve to the seat is the 45* angle. The other 2 angles are used to smooth the transition of air flow from the bowl area past the seat and into the chamber. Grinding the back of the valve will smooth this transition as well, and adding angles on the seat will help as well. You have to know what angles help with the design of the head. less turbulence = better flow.

Also for flow values, they don't mean much if you just a max flow @ .500 lift, or even a single value at max lift. More flow doesn't = more power always. Quite a few factors for an end result worth discussing.
 

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vegeta is 100% correct. as I've said before I perform a two cut method on the valve, and a three cut on the valve seat. (look at jbp.com I've added 5-ang valve job pics to the machine shop section) After a 5 angle cut vs 3-ang, I pull an extra 1CFM out of the gen2 heads. Still have yet to work on a gen-3 head.

z_two_4:
my exhaust side varies slightly for CFM, it's usually around: 200 or so at .400 lift. however, the power output is predicted by what application you are running.
 

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darkz24 said:
z_two_4:
my exhaust side varies slightly for CFM, it's usually around: 200 or so at .400 lift. however, the power output is predicted by what application you are running.
holy shit! you're getting an extra 90 cfm out of the exhaust side? :eek:
 

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c24 said:
I was quoted $300 US for P&P on both heads on my 2.8L. I don't see how you get $1200 that's outrageous even if you did a 5 angle valve job lol. I'm with whoever said they'd do it themselves though.
well thats 1200 cdn, so 800 Us, and let's see your guy get 200-220 cfm on the intake side. stock is approx 130 I believe.
 
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