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| Piston to Deck Clearance | Login/Join |
DRR Pro |
My concern would be the position of the top ring, probably wouldn't want to spray it. I put together a bracket 565 that ended up .003" out of the hole, .041" gasket, no issues. Certain combustion chambers like really, really tight quench area for max HP. I strive to keep mine under .040" and I'm comfortable with most at .035" "Despite the high cost of living, it remains popular." Dave Cook N375 | |||
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| DRR S/Pro |
I was told by a World Champ, lay two thin pieces of solder on the deck and across the dome , roll it over no gasket and measure. Adjust from there. Raceless in California! | |||
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DRR Pro |
I ran one 2 out the whole and 28 head gasket. Was many years ago, Don't do it. Glad I did not run it long. Almost made witness marks on the piston. Lets just say there was no carbon on the piston.  | |||
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DRR Sportsman |
Don't forget another issue when using the thin one Hitting the plug. Pending on the reach. Are the pistons notched for the plug and the flame travel? Run the thick gasket and still clay it up. Most critical is 10*BTDC and 10*ATDC. | |||
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| DRR Top Comp |
If checking piston to valve clearance. You still need to check it several degrees each way if advancing or retarding the camshaft. . Dave F J B | |||
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| DRR Sportsman |
The way I was taught to check this by an old Comp Eliminator engine builder/racer was to scribe the head to the bore. Then put a piston upside down with the dome in the chamber. If you can move the piston out past the scribe line in all directions then you know that the dome clears the chamber with the flat of the piston in contact with the head. Meaning the flat is your closest point. I also agree that piston skirt and clearance is a big factor in what you can get away with. As a side note Steve Morris recently posted a really good video about piston to head and quench area especially in regards to an engine running any kind of power adder. B.J. Masiello | |||
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| DRR Trophy |
Have run 4.560 bore 555 with 0.041 gasket, zero deck, 6.535" rod, 4.250" stroke, 9.800" deck. Yes showed evidence of piston rubbing/touching the head on back side of the dome spark plug side of the piston. Swapped to 0.051" head and no longer had issues. The 0.041" gasket combo didn't "cause" any real issues that i could tell, but it was evident that there was some contact, minimal but there was contact. No damage to pistons but you could see the carbon knocked off of the piston and it was rubbed a tad in the area mentioned. With the 0.051" gasket i didn't see that on future rebuilds. Its all about piston rock, as mentioned before piston design plays a factor with longer rods and longer strokes wrist pin has to move upwards in the piston effectively shortening the skirt and thus ability to resist rock at the top and bottom of the bore. Someone said it already, with piston 0.010" out the hole, i'd throw a 0.061" on it and be happy. | |||
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DRR Pro |
x2 honesty is the best policy,insanity is a better deffense 1.036, 6.16@ 224 | |||
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