New plan for 2008.....

[gs14racer]

Well it looks like Im gonna change the direction of the build for 2008. After much deliberation with my co conspirators where gonna campaign two 240's in the time attacks they have here in the south east.

Now the plan is to stay NA and use Mettlers cams when they become available. However to get where i want to be im thinking i will be needing a little more compression. I want to retain stock pistons and was contemplating milling the heads.

Now you guys are much more knowlegable than me so you tell me.

Will there be piston to valve issues? Etc..

I would like to be as close to 11.5 to 1 as possible.

Also im gonna have the spare heads ported and was thinking of having the crank knife edged as well. Let me know what you guys think.

[Mettler]

hmmm something you could consider with milling the heads is that you'll end up having the intake ports not matching up with the manifold anymore, which will probably be a good excuse to go to ITBs

If you tell me how much you end up milling your heads down by, I'll be able to custom spec some cams just for your application... tho I'm not sure you'll be able to mill them down by much before the edge of the intake valve becomes coincident with the face of the headgasket.

I'm kinda kicking myself at the moment for not taking the extra time to find some higher compression pistons for my build... but you gotta draw the line somewhere... I recommend that you find some custom domed pistons rather than milling the heads!

[SuperHatch]

I recommend that you find some custom domed pistons rather than milling the heads!

I agree with this statement 110%...

Not only will it help keep the geometry of the intake manifold stock, it will also prevent possible timing chain issues, cam timing issues, and piston/valve clearance issues. Custom pistons will allow you to increase compression, but will also allow you to increase the depth of the valve reliefs in the piston dome, allowing a much more agressive cam. The later would be opposite if you mill the heads as aggresively as required to increas the compression as much as you'd like...

[gs14racer]

Guys I totally respect your opinions and in no way am I discounting them.

However this is my dilema all though the cams might yield the power I want, they also may not. So to me since I have a yard full of VH's laying around its easier to swap the heads for another set and slap a supercharger if anything at the end. Thats the main reason I would want to keep the pistons stock and mess with the heads.

After a friend did the rough math I dont even think I can get much over 10.8 to 1 even after milling them down as far as I was told was safe.

I know the cam timing will be slightly off however the intake manifold isnt a concern.

Hopefully Mr. Mettler will get me 350whp at the very least. So i wont get passed by the vipers in the straights

[riu]

I'm kinda kicking myself at the moment for not taking the extra time to find some higher compression pistons for my build... but you gotta draw the line somewhere... I recommend that you find some custom domed pistons rather than milling the heads!

other than getting completely custom pistons made, the only place i knew of that had high compression pistons on the shelf for the VH was Escort Racing, the guys who did the original VH41/45 swaps in japan for the Z32, the same shop that built the Z32 drag car and the salt flat car.

their website is escort-jp.com they used to have a mirrored site in english but its no longer working, but i'm sure its a good place to start looking.

[defrag010]

You will see exponentially greater gains from port work on the heads than raising compression, especially with "mild" cams.