These heads
These heads Do you think I will have any issues with these heads on a stock 346 cube?
I am going to order these along with an MS4 cam.
I am mainly concerned with the valve size. I want to ensure they are not to big. My original plan was to go with 7.350" pushronds to compensate for the .005" milling on the heads.
I am going to order these along with an MS4 cam.
I am mainly concerned with the valve size. I want to ensure they are not to big. My original plan was to go with 7.350" pushronds to compensate for the .005" milling on the heads.
Last edited by -=Modified=-; Dec 18, 2006 at 03:57 AM.
I am pretty much going to do what they did in this article. They didn't mention anything about flycutting.
http://www.gmhightechperformance.com...onclusion.html
http://www.gmhightechperformance.com...onclusion.html
Originally Posted by -=Modified=-
Can you explain why you would cut them? This is what I am still trying to understand. I am a bit confused. Is it because the piston might hit the head?
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Originally Posted by -=Modified=-
Ah I see. So TSP mills them .005 and they don't account for this?
IN the article they used Stg 1 heads. Those heads do not require flycutting. You want to purchase Stg 2.5 heads which are milled. They mill the heads for smaller combusion chambers. Flycutting is something the builder needs to figure out because of endless possibilities with camshafts. With the size of the MS4, it will require flycutting.
Originally Posted by Oh4GTO
IN the article they used Stg 1 heads. Those heads do not require flycutting. You want to purchase Stg 2.5 heads which are milled. They mill the heads for smaller combusion chambers. Flycutting is something the builder needs to figure out because of endless possibilities with camshafts. With the size of the MS4, it will require flycutting.
The last sentence in the first paragraph.
A replacement set of Texas Speed & Performance chromemoly pushrods (PN 25-7350, retail $109.99) in a 7.350-in size are used to compensate for the .005 of head milling performed to ensure a flat sealing surface.
* 7.400" = 187.96mm
* -7.350" = 186.69mm
____________________
* 0.050" = 1.27mm
Head mill of .005 = .127mm
Wouldn't they be safe not flycutting and still going with a 7.400" pusrod?
The gasket should cover the difference and not hurt compression right?
Last edited by -=Modified=-; Dec 18, 2006 at 04:14 AM.
TECH Resident
Joined: Sep 2004
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From: Clarksville, Tn
Not to sound like a dick, but call TSP or email them and ask.....They have all the answers, they made the stuff, so they know what goes well with what, and what needs grinded, or cut and what gaskets to use......
Originally Posted by cws T/A
PRC Stg 1 uses stock size valves 2.00 / 1.550
PRC Stg 2.5 uses 2.04 / 1.575
PRC Stg 2.5 uses 2.04 / 1.575
IM not sure about the milling of the Stg 1s. As far as I knew they had only a CNC job and upgraded springs with all the goodies. I got them because the MS4 would fit without flycutting and they are a great price. Today TSP offers a valve upgrade for those heads. Those valves will defiantely require flycutting the pistons with the MS4.
The stage 1 has extra clearance built into the head allowing us to deck them 15 thou & still give better than stock p/v. That being said the LS6 2.5 heads have less p/v than a stock head. As a result we typically ship the stage 1 with the ms4 camshaft. Honestly with all the results I've seen I like the stg1 heads a lot when combined with the ms4 
Jason
Texas Speed
Jason
Texas Speed
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Thanks Jason.
I will ordering them today.
It sucks because I want the stage 2.5 because I will be adding a Procharger next year but don't feel comfortable milling the pistons.
Can you do stainless steel valves on the Stage 1?
I will try to give you guys a call today to order everything.
You sent me an estimate awhile ago jason.krivda@maab.centaf.af.mil
I will ordering them today.
It sucks because I want the stage 2.5 because I will be adding a Procharger next year but don't feel comfortable milling the pistons.
Can you do stainless steel valves on the Stage 1?
I will try to give you guys a call today to order everything.
You sent me an estimate awhile ago jason.krivda@maab.centaf.af.mil
