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Old 09-28-2010, 05:18 PM
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I need an experienced engine builder/machinist help with a deck height problem

Im having an issue with piston deck height. The problem is the piston is not level across the piston pin.Number one and four are the worst,the front side of the piston is .012 out of the hole and the rear is .001 out. the other is .007 out and -.002 in. the others are wihin a few thou. The measurements were taken at center of piston across the pin.
Ive swapped them around to a different hole and even different rods and it seems to follow the piston but when I checked the pistons from the pin to the crown of the piston they are within .0005 tolerance.
This is a ford 302 stroked to 331 everything is new DSS Racing cnc'd block,eagle forged crank,eagle h-beam rods,DSS Racing Forged Pistons.
This isnt my first build and Ive never ran across something like this.
If anyone can help it would be very helpfull,If anyone can help id even call them to go into detail.

Scott
M&W Auto Custom Paint and Performance

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Old 09-28-2010, 06:59 PM
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Quote:
Originally Posted by et1320n12
Im having an issue with piston deck height. The problem is the piston is not level across the piston pin.Number one and four are the worst,the front side of the piston is .012 out of the hole and the rear is .001 out. the other is .007 out and -.002 in. the others are wihin a few thou. The measurements were taken at center of piston across the pin.
Ive swapped them around to a different hole and even different rods and it seems to follow the piston but when I checked the pistons from the pin to the crown of the piston they are within .0005 tolerance.
This is a ford 302 stroked to 331 everything is new DSS Racing cnc'd block,eagle forged crank,eagle h-beam rods,DSS Racing Forged Pistons.
This isnt my first build and Ive never ran across something like this.
If anyone can help it would be very helpfull,If anyone can help id even call them to go into detail.

Scott
M&W Auto Custom Paint and Performance
The only thing you can do is have your rod and pistons ckecked using the alignment fixure sunnen has, You can check the piston on the rod and then check the rod for bend and twist with out the piston attached,

Good luck
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