427 tall deck rebuild

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kellerbm

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Seemed legit and had a decent shop, truthfully seemed knowledgeable. Just was confused on why he was hesitant on boring my block 60 over. Just didn't know if some one had more insight on the reason why.


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74 Shortbed

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Well I got the stroker kit for the 427 tall deck, thing is the pistons with the kit are 4.310 bore 60 over. The guy boring my block suggested i go with 4.280 bore pistons instead, in case something goes wrong the block can still be rebored. I am new to this and looking for any input or thoughts on what I should do.


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The block can go .100 easy, but for piece of mind have it sonic checked if you want, mine has a fair amount of core shift but it could still go .125 and still have plenty material left, but it's you're deal do what you feel comfortable with, you'll have a 489 with .280, I wouldn't think twice at .060 over..
 

kellerbm

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Told what I intended to do with the block, wanted to run pump gas so was looking for about 10:1 compression max.


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kellerbm

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The block can go .100 easy, but for piece of mind have it sonic checked if you want, mine has a fair amount of core shift but it could still go .125 and still have plenty material left, but it's you're deal do what you feel comfortable with, you'll have a 489 with .280, I wouldn't think twice at .060 over..

So you think I should play it safe and switch the pistons out?



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So you think I should play it safe and switch the pistons out?



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That is up to you whatever you feel comfortable with, like I said 60 over is no biggie plenty of material left..
 

Honky Kong jr

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So you think I should play it safe and switch the pistons out?



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I think you should get the opinion of another machinist before trying to return specialty pistons tall deck stuff isn't usually " off the shelf" items.
 

kellerbm

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That is up to you whatever you feel comfortable with, like I said 60 over is no biggie plenty of material left..
Would you happen to know the connecting rod length for a 496 stroker with a 10.2 tall deck with a 4.25 stroke. I have a feeling I ordered the wrong stroker kit.


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Honky Kong jr

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Would you happen to know the connecting rod length for a 496 stroker with a 10.2 tall deck with a 4.25 stroke. I have a feeling I ordered the wrong stroker kit.


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Rod length is directly proportional to piston pin height. Meaning that regardless of tall deck or standard you can run a long rod it's just gonna push the pin further up the piston. Generally on a tall deck you wanna use the longest rod.
 

kellerbm

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Rod length is directly proportional to piston pin height. Meaning that regardless of tall deck or standard you can run a long rod it's just gonna push the pin further up the piston. Generally on a tall deck you wanna use the longest rod.
Well the kit I got from eagle came with 6.385 connecting rods with 18cc pistons, is there a way to figure the rod length depending on piston height.

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If you got a 496 kit 6.385 is the right combination and the piston will have the right pin location, but the dome may not be right for the compression you're looking for, that needed to be figured out before buying the kit.
 

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Well the kit I got from eagle came with 6.385 connecting rods with 18cc pistons, is there a way to figure the rod length depending on piston height.

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6.135 are stock you have 6.385? They make 6.535 which in theory would allow for use of standard pistons in a tall deck block but your a stroker so it throws a monkey wrench into the mix. Your new rod are .250" longer then stock the other .150 is more then likely made up in the stroker piston.
 

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If you got a 496 kit 6.385 is the right combination and the piston will have the right pin location, but the dome may not be right for the compression you're looking for, that needed to be figured out before buying the kit.
18cc ain't that big especially if running 119 + cc chambers
 

Honky Kong jr

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That's if he's using 049's, depends on deck height and gasket thickness too.
Yeah I have 96cc chambers and a .022 mls head gasket and a decent dome at 10.5:1 somebody way smarter then me came up with that number lol
 

kellerbm

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6.135 are stock you have 6.385? They make 6.535 which in theory would allow for use of standard pistons in a tall deck block but your a stroker so it throws a monkey wrench into the mix. Your new rod are .250" longer then stock the other .150 is more then likely made up in the stroker piston.
118cc will put me at 10.2:1 compression with this kit. Which is where I want to be cause I want to be able to use pump gas.

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