Oversized valve stems?
Oversized valve stems? I have a set of GTP stage 2 heads a friend is giving me,basically rent to own on them. But the problem is they are for forced induction applications at 70 cc. I sent them to CNC Head in Pinellas Park to be angle milled but upon futher insp. when they recieved them I found out the valve guides are bad, and CNC said due to the exstinsive porting pressing in the new guides would be risky. I was talking with some local friends about this and someone said they make a oversized valve stem that wouldn't require pressing in new guides, just drilling the existing ones out to correct size. I plan on calling CNC and asking them, but I'm open to any suggestions cause I would really like to take advantage of this "deal". Thanks for any input. 
Mark.
Mark. 
TECH Fanatic
Joined: Jun 2002
Posts: 1,979
Likes: 3
From: Upstate NY
Originally Posted by 99LSWON
I have a set of GTP stage 2 heads a friend is giving me,basically rent to own on them. But the problem is they are for forced induction applications at 70 cc. I sent them to CNC Head in Pinellas Park to be angle milled but upon futher insp. when they recieved them I found out the valve guides are bad, and CNC said due to the exstinsive porting pressing in the new guides would be risky. I was talking with some local friends about this and someone said they make a oversized valve stem that wouldn't require pressing in new guides, just drilling the existing ones out to correct size. I plan on calling CNC and asking them, but I'm open to any suggestions cause I would really like to take advantage of this "deal". Thanks for any input. Mark.
Mark.What would be your static compression with these heads? lower than stock?
e-Bay would be a better place for your "friend" to dispose of his heads.
Don't invest any money in this set.
Oh, yeah, listen to GIZMO.
the heads can either have new guides pressed in, or they're junk.
id have them carefully try to do it... with the understanding that the heads might be ruined, and you'll still have to pay for the guide install.
id have them carefully try to do it... with the understanding that the heads might be ruined, and you'll still have to pay for the guide install.
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Originally Posted by airflowdevelop
this all in all is why god created the tig welder...
you can cut the existing guides out also...What is he afraid of? Pushing the spring pocket? Also, How bad are the guides?
Dennis
you can cut the existing guides out also...What is he afraid of? Pushing the spring pocket? Also, How bad are the guides?
Dennis
I'm still pondering the oversize valve stem. I know they weigh more but seems like the ti. retainers would offset that. I'm not going to run above 6,500 with only a 150 shot. does this change anything? 
They should be able to press in new guides without any problems.
Don't panic unless a problem comes up, and then still don't panic.
Like has been said before, there's nothing a TIG can't fix.
Your heads are NOT scrap.
Don't panic unless a problem comes up, and then still don't panic.
Like has been said before, there's nothing a TIG can't fix.
Your heads are NOT scrap.
how bad are they? if they aren't TERRIBLE, back in vocational the teacher said they had a tool you could use that would scuff them up some, actually adding meat back in (fluffing what metal is there up)
On The Tree
Joined: Oct 2003
Posts: 150
Likes: 0
From: harrisburg PA
I am also really liking some of the new repair sleeves...have some in high rev race engines with crazy geometry...and no problems...this should not be a problem..If Hudgins can't get her fixed...I am sure we can figure something out if you are in a bind...
Dennis
Dennis
Originally Posted by airflowdevelop
I am also really liking some of the new repair sleeves...have some in high rev race engines with crazy geometry...and no problems...this should not be a problem..If Hudgins can't get her fixed...I am sure we can figure something out if you are in a bind...
Dennis
Dennis
