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Old Aug 11, 2010 | 03:18 PM
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From: boiling springs sc
St. Jude Donor '06
Default cam specs question
i want to run a comp thumper cam in my 2001 corvette...auto matic...will the stock heads work or will I have piston to valve clearance problems from my other wise stock motor???



Johnny
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Old Aug 11, 2010 | 04:31 PM
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I am running stock 243 heads. My cam is 224/230 .585/.595 113. with no p/v clearance issues. My understanding is (real motor guys correct me if I am wrong ), any lift < .600 will not encounter p/v issues.

Hope that helps.
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Old Aug 11, 2010 | 06:32 PM
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Total lift is not really relevant. What determines PTV is the duration and ramp rate. If the OP wants more responses, he should really post the cam specifications.
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Old Aug 12, 2010 | 09:10 AM
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Originally Posted by vettenuts
Total lift is not really relevant. What determines PTV is the duration and ramp rate. If the OP wants more responses, he should really post the cam specifications.
duration and ramp rate count! especially if the heads have been milled!
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Old Aug 12, 2010 | 02:23 PM
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From: boiling springs sc
St. Jude Donor '06
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Originally Posted by dankhts
duration and ramp rate count! especially if the heads have been milled!
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT: .554 .537
DURATION AT
.006 TAPPET LIFT 275 295
VALVE TIMING OPEN CLOSE
AT .006 INT 33 62
EXH 77 38

THESE SPECS ARE FOR CAM INSTALLED
@ 103.0 INT C/L
INT EXH

DUR @.050: 219 233
LOBE LIFT: .3260 .3160
LOBE SEPARATION: 109.0
now ....will it fit without cutting the pistons???
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Old Aug 12, 2010 | 03:48 PM
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Looks like a

219/233 554/537 109
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Old Aug 12, 2010 | 03:52 PM
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Originally Posted by AU N EGL
Looks like a

219/233 554/537 109
do you think i can use it??
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Old Aug 12, 2010 | 04:23 PM
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I'm running a 237/242 .609 112LSA on stock 241 heads with no problems.
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Old Aug 12, 2010 | 04:47 PM
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Originally Posted by racerwannabe
do you think i can use it??
no problems
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Old Aug 12, 2010 | 06:17 PM
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Originally Posted by racerwannabe
do you think i can use it??
Stock heads? definitely

Stock springs? ehhh...
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Old Aug 12, 2010 | 06:32 PM
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I also would not use stock springs
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Old Aug 12, 2010 | 08:34 PM
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Should clear but I would still measure for two reasons. You will know how much clearance you have and if you ever decide to do something else (for example mill heads) you won't be guessing later.
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Old Aug 13, 2010 | 10:48 AM
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From: boiling springs sc
St. Jude Donor '06
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Originally Posted by vettenuts
Should clear but I would still measure for two reasons. You will know how much clearance you have and if you ever decide to do something else (for example mill heads) you won't be guessing later.
will do..and will get the kit..springs retainers rockers etc..
thanks guys!!
Johnny
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