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1 Day 11-14-2004 06:42 PM

Piston to valve clearance
 
I will check the archives for information later on but can any one tell me offhand if piston to valve clearance will be a concern in this application. 327 bored .40, resurfaced deck, .100 domed pistons, .465 lift cam, Edelbrock RPM heads, 70 cc chambers, 170 runners. I'm not sure what the piston to deck distance is. Thank you, awesome amount of great info on this site.

BOBCRMAN@aol.com 11-14-2004 06:47 PM

At .465 lift you should have plenty of room... BUT check it with a piece of clay,, just to be sure!!

Max Keith 11-14-2004 07:34 PM

valve clearance
 
When you clay the pistons to get an imprint of the valve, measure the imprint with a micrometer and you should have a minimum of .050" thickness. Anything thinner could translate to eventual valve/piston clash if your valves should happen to float.
At higher RPM your valves can actually stay open at max lift for a longer period of time as the lifter may actually come off the lobe when it hits the return side of the lobe. when this happens, thats when you could wind up with a valve coming in contact with a piston. Just be sure you have the correct tension springs for your cam and dont try over revving it; turnging it higher than the grinders recommended rpm range.

lluciano77 11-14-2004 09:23 PM

You won't have any problems with that cam.

machine shop tom 11-15-2004 08:16 AM

Re: valve clearance
 
Quote:

Originally posted by Max Keith
When you clay the pistons to get an imprint of the valve, measure the imprint with a micrometer and you should have a minimum of .050" thickness.
That's a little too tight. Most of the time, .100" minimum for exhaust, .080" for the intake is recommended.

However for your application, your lift, duration, and timing events tell that you will have no problems, unless you install the timing components incorrectly.

tom

Max Keith 11-15-2004 12:31 PM

valve clearance
 
Where he to have a lot higher lift and longer duration in his cam, I would have recommended more clearance on the clay measuring. I do agree that probably .100" should be the minimum under usual circumstances.


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