Thats when you have it just right Charlie.
Jess
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| Valve to piston clearance https://slantsix.org/forum/viewtopic.php?t=27433 |
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| Author: | pinkiedog64 [ Mon Feb 25, 2008 1:03 pm ] |
| Post subject: | Valve to piston clearance |
I will be running a 280 deg//465" cam with a head that's been milled .100" with stock piston height. How do you check valve to piston clearance, and what is the minimum allowable distance? I have heard of people putting a lump of play-dough on the piston (with the head on) and rotating the crank around until the piston comes to the top and the valves open all the way and then measuring the indention in the play-dough. Thanks for all the input so far and what is to come-you guys are great! |
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| Author: | GTS225 [ Mon Feb 25, 2008 1:26 pm ] |
| Post subject: | Re: Valve to piston clearance |
Quote: I have heard of people putting a lump of play-dough on the piston (with the head on) and rotating the crank around until the piston comes to the top and the valves open all the way and then measuring the indention in the play-dough.
*********************************************************Thanks for all the input so far and what is to come-you guys are great! I'd say do that anyway. It's a darn sure way of seeing just how much clearance you do have. Roger |
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| Author: | Doc [ Mon Feb 25, 2008 1:30 pm ] |
| Post subject: | |
Measure it as discribed, .060 is as close as you want to see it. .100 is better. Make sure you already have the cam degreed, the correct head gasket thickness and the valve lash set before you do the check. DD |
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| Author: | Charrlie_S [ Mon Feb 25, 2008 7:41 pm ] |
| Post subject: | |
I have "cheated", and degreed the cam, install the head with no gasket, set the lash at zero, turn the motor over, and if nothing hits, run it. Of course I did have some valve marks on the top of the pistons, after pulling the engine down to freshen it up. |
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| Author: | LUCKY13 [ Tue Feb 26, 2008 1:49 am ] |
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Thats when you have it just right Charlie. Jess |
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| Author: | Doc [ Tue Feb 26, 2008 8:28 am ] |
| Post subject: | |
Was that process done with a steel shim (.020) or a composit (.045) head gasket? On a 170 or a 225? DD |
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| Author: | Charrlie_S [ Tue Feb 26, 2008 5:28 pm ] |
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Quote: Was that process done with a steel shim (.020) or a composit (.045) head gasket? On a 170 or a 225?
It was a steel shim 170. I am not recommending this procedure. Just stating, that I have gotten away with it. I did have interference, while running, but just barely, Sometimes you get lucky, sometimes you don't.
DD |
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| Author: | Doctor Dodge [ Tue Feb 26, 2008 11:04 pm ] |
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It sure sounds like you fornd where the "edge" is on that combo... (It is alway nice to know where the edge is)  DD |
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