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#1
12-24-2003, 05:15 PM
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My brother recently purchased a set of the 72cc Edelbrock heads. He then purchased an Xtreme Energy 51-225-4 cam from Comp Cams. The stats for the cam are on the Com website at the following link http://www.compcams.com/Technical/Ca...L/210-217.html
My question is how would one check to see if he has ample valve clearence to run 1.65 rockers? He has a 400 punched .30+ and has Speed Pro Flat tops with 4 valve reliefs. Any help would be greatly appriciated. 
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#2
12-24-2003, 05:15 PM
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My brother recently purchased a set of the 72cc Edelbrock heads. He then purchased an Xtreme Energy 51-225-4 cam from Comp Cams. The stats for the cam are on the Com website at the following link http://www.compcams.com/Technical/Ca...L/210-217.html
My question is how would one check to see if he has ample valve clearence to run 1.65 rockers? He has a 400 punched .30+ and has Speed Pro Flat tops with 4 valve reliefs. Any help would be greatly appriciated.
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#3
12-24-2003, 06:59 PM
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With the cam installed,put some modeling clay on the piston top.Put the head on the engine and use a pushrod and rocker.Rotate the engine 2 revolutions. Take head off and measure the indentation in the clay.
johnta1 Pontiac Power RULES !!! www.wallaceracing.com 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#4
12-25-2003, 07:24 PM
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Thanks, I'll try it and see what happens. What measurement would ensure that there is enough clearence? Do I need to do anything to account for expansion?
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#5
12-26-2003, 06:27 PM
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You can not check that way with a hydraulic lifter unless you "make it" solid. Unless it is pumped up - but here is what I do: Get an old lifter. (that is not worn out) take it apart and replace the spring with aluminum foil or what ever to keep the plunger from going down. Of course this is not necessary with solid lifters.
On Hydraulic roller motors, I use the same fake solid lifter with a corresponding (longer) pushrod - not the hyd roller pushrod that is much shorter. Also do not use the head gasket if the piston is below deck. Then you can add the compressed head gasket thickness to the clay method (like .040). If the piston is above deck - you must use a gasket or the piston will touch the head and not allow the engine to rotate. turn the motor over (by hand) at least 2 complete revolutions so the cam will turn at least once. Its easier to start at TDC on the compression stroke so both valves are closed. you should have over .080 clearance your also should not even be close to having any issues with that cam. more details on Comp web site. ~~~~~~~~~~~~~~~~~~~~~~~~~ www.spottsperformance.com
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~~~~~~~~~~~~~~~~~~~~~~~~~ www.spottsperformance.com East Coast Pontiac engine builder - still going strong 4 month waiting list email [email protected] 1981 Trans Am 455 w/6X heads 4 speed 4 wheel disc (for sale) 1969 Trans Am clone 9.79 at 139 so far 1964 Banshee clone project - Opel GT platform |
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