Posted by D Slater on March 04, 2015 at 16:33:03 from (184.14.187.78):
In Reply to: Re: Farmall M Head posted by Russell Dewsnup on March 04, 2015 at 13:27:31:
Is the piston contacting the combustion chamber deck edge on the opposite side from the spark plug? Could you let us know the brand of pistons?
Pistons ideally should be the same weight for all 4 cylinders and the combustion chambers the same CC. If hitting the sharp edge of the combustion camber I asked about above you can round that edge off a little. Maybe do all 4 chambers the same. May loose a little compression but don't think any performance will be lost.
Unless the piston is obviously made with the raised area different than the other pistons. Saw some aftermarket pistons with the top not clocked correctly with the pin holes. Would send them back if so. Sometimes the head castings can be a little off also. Lay a straight edge down the edge of the combustion chambers to see if any one looks cocked compared to the others.
If hitting head where I asked about there's another option. A 400 or 450 head would probably work without hitting and give you more power. They have a sloop on the combustion chamber edge and I'm guessing your piston step isn't very high.
This post was edited by D Slater at 16:34:36 03/04/15.
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