Do i need to notch pistons with TF TW heads?
04-23-2007, 04:08 PM
#1
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Do i need to notch pistons with TF TW heads?
Someone help me on this one, i'm clueless. I've actually read an article that says that you DONT need to but people have told me that you do. Someone that has tf heads please answer this post with what you have done please
04-23-2007, 04:17 PM
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RE: Do i need to notch pistons with TF TW heads?
yea i read it. Dont really understand it. Are you saying that as long as i dont run a cam over .540 lift then i will be fine w/o notching the pistons?
04-23-2007, 04:30 PM
#6
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RE: Do i need to notch pistons with TF TW heads?
idk, i'm buyin em used from a guy that buys and sells mustang parts...he's giving me 1.6 roller rockers with them for 700 bucks so it seems like a pretty good deal.
04-23-2007, 04:34 PM
#7
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RE: Do i need to notch pistons with TF TW heads?
yeah that is a good price if they are in good shape. i bought mine new 1100 new.but if u are going to run a bigger cam than.540 i would definetely find out what springs u have or just replace them since they are new then u can run a bigger cam
04-23-2007, 05:06 PM
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RE: Do i need to notch pistons with TF TW heads?
ORIGINAL: 94RedDevil
yea i read it. Dont really understand it. Are you saying that as long as i dont run a cam over .540 lift then i will be fine w/o notching the pistons?
yea i read it. Dont really understand it. Are you saying that as long as i dont run a cam over .540 lift then i will be fine w/o notching the pistons?
Edit: I can't spell...
04-23-2007, 08:35 PM
#9
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RE: Do i need to notch pistons with TF TW heads?
yea they will they come stock wit springs that hold up to .600 lift. i would check ptv nooone can tell u what ur car will do. on a normal 5.0 u should be able to get away wit it. but i would check.
ORIGINAL: LTnone
Your pistons would be fine, but stock TW valve springs won't hold up to .540+ lift
Edit: I can't spell...
ORIGINAL: 94RedDevil
yea i read it. Dont really understand it. Are you saying that as long as i dont run a cam over .540 lift then i will be fine w/o notching the pistons?
yea i read it. Dont really understand it. Are you saying that as long as i dont run a cam over .540 lift then i will be fine w/o notching the pistons?
Edit: I can't spell...
04-23-2007, 10:09 PM
#10
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RE: Do i need to notch pistons with TF TW heads?
The .540" for TW heads and .600" for TH heads, is a valve springs limitation spec, not a PtV spec.....otherwise they wouldn't include.......
...in their Tech Specs sheet.
BTW, total valve lift is not a factor for possible PtV problems...the valves can only collide with the piston during the exh-to-intake changeover cycle (overlap), and both valves (intake and exhaust) could be open from .016" to .1xx" depending on the cam profile. You could have a .600" lift cam that would not have problems, and a .440" lift cam that would bend some valves.
NOTE:
• Maximum camshaft lift with factory flat top pistons:
Twisted Wedge: .540" lift; Track Heat: .600" lift
• Check piston to valve clearance before installation
• Stock stamped Ford rocker arms are not recommended
• Maximum camshaft lift with factory flat top pistons:
Twisted Wedge: .540" lift; Track Heat: .600" lift
• Check piston to valve clearance before installation
• Stock stamped Ford rocker arms are not recommended
BTW, total valve lift is not a factor for possible PtV problems...the valves can only collide with the piston during the exh-to-intake changeover cycle (overlap), and both valves (intake and exhaust) could be open from .016" to .1xx" depending on the cam profile. You could have a .600" lift cam that would not have problems, and a .440" lift cam that would bend some valves.