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Old 03-08-2012, 07:12 PM
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427 tall deck motor

im tryn 2 c how much wud i have 2 bore a tall deck block, what size rod, & what size crank i wud have 2 use 2 make it a 540?

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Old 03-08-2012, 08:56 PM
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Bore x Bore x Stroke x Number of cylinders x .7854

(Example) 4.5 Bore x 4.5 Bore =20.25 - 20.25 x 4.5 Stroke=91.125 - 91.125 x 8 cylinders=729 - 729 x .7854= 572 cubic inches
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Old 03-08-2012, 09:47 PM
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I think you can bore it to..125 over safely.without using hardblock up to to the coolant holes in the block. So bore wold be 4.375 has for.as.stroke.you can fit a 4.500 with clearancen.maybe more. Could possibly for 4,750 stroke. Go 4.440.bore with hard block fill.
that's close to a.4.500 bore of.you think of of that only. .060 more or think of of like this only. .030 per side
personally. I got a. Dart bigM block
use the above.formula to find out cubes good luck
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Old 03-08-2012, 09:50 PM
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Or bore x bore x.stroke x.7854 x 8= cubes
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Old 03-08-2012, 10:03 PM
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ok Stinger460.thnx 4 da info.so will da machine shop have 2 notch da block or will da 4.5 stroke drop rite in?
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Old 03-09-2012, 06:14 AM
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EVERY block is different. When I sleeve these, the OD of repair sleeve is 4.440+ and there is still over .100" still in the original wall. So a .125 overbore should not be a problem. I have drag raced them with no problems. A 4.50 stroke crank will probably need some clearance work. Depends on other factors. Such as Type and length of rods. Crank counterweight style.
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Old 03-09-2012, 02:12 PM
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Or bore x bore x.stroke x.7854 x 8= cubes
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