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390 deck milling |
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DragRacingSpirit 
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Joined: May/27/2009 Location: Mo Status: Offline Points: 903 |
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 Posted: Nov/28/2021 at 11:59pm |
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when you are looking at numbers in the machining world.......or in the engine specification world, .070 is a lot to me ?
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Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Nov/29/2021 at 12:20am |
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DragRacingSpirit - I'll go along with that .070" is considerable, but not "huge" physically, in context.
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brownspirit
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Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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Posted: Nov/29/2021 at 4:43am |
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I agree that it is a lot, it makes me nervous. It is visible, when I was looking the block over, it was easy to tell that it had been decked more than typical. My measurements could be off a bit, but not much. I certainly wish the previous owner had not taken that route. I’m not positive piston availability was the reasoning, but that is all I can figure. They could have put 401 rods in, that would have got the pistons to .028-.030 in the hole which is where they are now after the decking. It was a bad choice, someone was trying to recover from a mistake.
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Nov/29/2021 at 5:23am |
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.07 should cause no issues but you should plane the intake surfaces
on all three planes. Heads and gasket deck. .02 should cause no issues. Keeping a .030 to .040 quench may cause you some fits :-)
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Gremlin Dreams
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brownspirit
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Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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Posted: Nov/29/2021 at 9:26am |
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Im gonna end up getting pistons for it I bet, it’s not worth the hassle of having issues. Also, I can get the compression ratio where I want it. Thanks for the input all. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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