The Most Cubic Inches Out Of A Stock Block? - 460 Ford Forum
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post #1 of 54 (permalink) Old 09-29-2010, 08:19 PM Thread Starter
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The Most Cubic Inches Out Of A Stock Block?

What is the most cubic inches that you can get out of a stock block? Also what would the bore and stroke numbers be for it? I was just wondering if you could get over 600 cubes but I'm thinking probably not otherwise I would have seen the stroker combo on here by now.

And how are the big boys getting 800+ cubic inches out of those pro-stock motors? Are they using plates ( I don't know what else to call them) in between the block and heads? Or are they just using high dollar blocks that you can bore and stroke the heck out of? Just curious... I'd like to go much larger than my current 521 cid build on the next motor. Thanks in advance!!
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post #2 of 54 (permalink) Old 09-29-2010, 09:04 PM
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557"= +.080" and a 4.5" stroke (aftermarket) crank. The block should be soniced first though. Each block is a little different. The "Mountain Motor" cubes are arrived at with after market blocks and long stroke after market cranks. Conveniently, an off-set ground stock crank (ground to 2.200" journal size, BBC size) and an +.080" over bore nets you 514"....quite a good combination if you ask me and not a lot of $. I had a 514" in my jet boat that was in the neighborhood of 700 horse, all on a 2 bolt block and a offset ground stock cast crank. Hope that helps.
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post #3 of 54 (permalink) Old 09-29-2010, 09:08 PM
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I think I have heard of 572 cubes with a factory block 4.620"stroke and 4.440" bore. I believe that some block clearancing needs to be done at that stroke.

I believe the prostock motors are tall deck blocks and are mucho $$$$! I bet Cale could tell you or Jon Kaase or even Lem Evans.

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post #4 of 54 (permalink) Old 09-29-2010, 09:24 PM
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I think I have heard of 572 cubes with a factory block 4.620"stroke and 4.440" bore. I believe that some block clearancing needs to be done at that stroke.

I believe the prostock motors are tall deck blocks and are mucho $$$$! I bet Cale could tell you or Jon Kaase or even Lem Evans.
for the BIG cubes --C&C aulim. tall decs . 572 are 4.5 by 4.5
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post #5 of 54 (permalink) Old 09-29-2010, 09:43 PM
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I've built a couple 576's.

Half filled block,
4.470" bore,
4.590" stroke; offset ground 4.300" stroke FRPP cranks.

The piston CD was 1.215" so, the ring stack is a NO nitrous piston.

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post #6 of 54 (permalink) Old 09-29-2010, 09:46 PM
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Man, that must be one SKINNY cylinder wall!! lol
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post #7 of 54 (permalink) Old 09-29-2010, 09:59 PM
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I've built a couple 576's.

Half filled block,
4.470" bore,
4.590" stroke; offset ground 4.300" stroke FRPP cranks.

The piston CD was 1.215" so, the ring stack is a NO nitrous piston.
C'mon Randy, you know that combo wants to be hit with a 400 hp nitrous shot.



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post #8 of 54 (permalink) Old 09-29-2010, 10:10 PM
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C'mon Randy, you know that combo wants to be hit with a 400 hp nitrous shot.



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post #9 of 54 (permalink) Old 09-29-2010, 10:45 PM
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So whats the max stroke a 10.300 deck H. block can take?
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post #10 of 54 (permalink) Old 09-30-2010, 08:24 AM
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So whats the max stroke a 10.300 deck H. block can take?
4.75 stroke but the only thing available is a custom billet

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post #11 of 54 (permalink) Old 09-30-2010, 10:01 AM
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572 CID = 4.5 stroke x 4.5 bore. No special clearance or parts needed. Just need to find a block with thick enough cylinder walls....which isn't nearly as uncommon as some might lead you to believe.

604 CID = 4.75 stroke x 4.5 bore. Custom crank and suitable block, but totally do-able.

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post #12 of 54 (permalink) Old 09-30-2010, 11:53 AM Thread Starter
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What length rods are needed for a 4.75 stroke to make 604 cubic inches?
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post #13 of 54 (permalink) Old 09-30-2010, 12:51 PM
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The length of rod is not in this equation. Bore and stroke only.

If you're not living on the edge you're taking up too much space!
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post #14 of 54 (permalink) Old 09-30-2010, 01:09 PM
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Cool

I'm currently collecting parts for a 585 cubic inch stock-block engine. In this combo, the rod ratio is better than a 6.8-rodded 557.

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post #15 of 54 (permalink) Old 09-30-2010, 01:11 PM
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What length rods are needed for a 4.75 stroke to make 604 cubic inches?
You could make it happen with a 6.700 rod. Would also require a semi-custom piston too.

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