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Tech Question
jason zalewski, prince albert, SK, canada, 1978 dodge monaco 360
I was wondering if it is possible to offset grind a 360 crank down to a 2 inch rod journal. If so can it be done on a cast crank as well as a forged? My plan would be to use a 4 inch stroke crank,offset grind it .125 inch to achieve a 4.25 stroke, use a 6.3 inch rod,1.09 comp height piston,at .060 overbore will come to 440 cube small block..will this combo work?
In a word: No. You have some math problems, for starters: If you offset grind a 2.125" journal to 2.00" you've only increased the stroke by 0.0625", theoretical maximum..
Then there's the cyl. wall thickness problem. The factory recommends 0.040" max. O/S for a reason. Any extra HP you'd get from the small displacement increase from, say, 0.020" to 0.060" bore diameter would be much more than offset by wall flex, which equals blowby.
Then there's the piston question. Sounds like yours will be hockey pucks. If the engine will be drag race only, you'd get by. For street durability, though, I'd rate this engine combo about a 3 on a 10 scale.
The cast crank needs all the iron it comes with!
Rick
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