Mangum

Hey guys,

I am a new member of the Forum as well as new member of the Corvette(Z06) family.

My question is how much gain from porting the stock LS7 heads. All the valve train issues have been corrected already but the heads was not ported. Trying to find out if its worth having it done.

Thanks!

lilredvette05

Your gonna get multiple multiple answers, I've heard read and heard as little as 5hp and as much as 25hp. I personally think most of the hp comes from the milling as the LS7 heads are already CNC ported, but I'm sure there is room for a little improvement.

Bottom line I think if you your gonna do a serious H/C car I would port and mill the heads

JoesC5

I don't have ported stock heads but I do have PRC 265 heads(not milled, so no increase in compression ratio) that flow 9% more on the intake and 12% more on the exhaust.

The shop only adjusted the tune to compensate for the additional flow(otherwise the same tune as stock) and I picked up around 20-25 HP at the rear wheels.

1SLOLT1

I just got a tune and had my heads ported. The car picked up 30hp and 25tq but I believe most of that was from the tune. I plan on more mods in the future (cam, headers, etc..) which is why I went with ported heads. If you never plan on more mods then I don't think porting is worth it.

MudZ06

I picked up 15whp.

Michael_D

Porting may hurt performance with the oem camshaft. It makes little sense to have them ported and not have a cam ground to work with the new port flow.

greatone61

Is it just possible to fix the stock heads with new retainers and valve and no porting/milling? I am thinking of doing a mild cam for a daily driver and if I can save 2k from not getting ported heads that would be awesome.

JT Metal

Milling is worth 20 +/- porting 5 +/-

FrankTank

Not worth it with the stock cam. you don't need it save the money

Absolutely , porting is optional for example with the WCCH stage II rebuilt LS7 heads., you don't need to mill either, they can just resurface so just a little shaving to get a clean start. I stuck with the stock cam and did not mill.

Dirty Howie

As Frank said, I got my WCCH with SS valves/titanium retainers/dual springs/bronze guides without milling or porting and kept my stock cam.


DH

MarkC

Talk to Vengeance Racing, they are a vendor on this forum.

Mark2009

Yes and no....
Not getting porting will only save you $700.

The term "WCCH Stage II" describes a ported head. Best not to use the term "Stage II" if you do not want ported heads (info from WCCH website).

Bobcatt

27 rwhp is what I picked up with AI ported stock heads, no milling.

0HorsePowerAddicts

We have LS7 packages with porting and without porting. Our base Head package is $2308.02 for rebuilding the LS7 heads with all the upgrades(bronze guides, SS exhaust valves, resurfacing, comp valve job, labor, ect.)

Alot of ls7 owners go for our head package without porting and add a cam the same time. That way you get greats gains from the cam and milling but can now sleep at night knowing you have taken care of the LS7 valvetrain issues.

Contact us for a quote today.

Mangum

Thanks for the replies, the heads are already milled .030 with all the valve guide issues fixed and SS exhaust valves installed from WCCH and has a 228/248 stick. (Put down 557)There will be more mods to come on the car like Fast 102 possibly NW 102 but undecided on the TB, any sugestions? What about the stock fuel pump and injectors? I was thinking the injectors would be maxed out but like I said this is the first Corvette for me.

rabrooks

With a .030 mill, how much does that increase compression. What is a safe increase using 93 octane.

Mangum

I think it moves to 11.8 or 11.9:1 and yes 93 is ok with proper tune

jnv255

There's always meth injection to help with that too

rabrooks

I suppose any knock sensor retards timing as protection, no?

Mangum

Yea they sure do... Can't figure out if that was sarcasm or what? I wouldn't soley trust my knock sensors to keep my motor together. IMO