422ci LT1?
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,710
Likes: 1
From: Green Bay WI
422ci LT1?
I've been doing some research into building a stroker (leaning towards a supercharged application).
I know SonnyinVA has a 409 (4" crank, 5.850" rods with a 4.030" bore), and based on this article - TPiS 409 TPiS did a 4.100" bore on a LT1 for a 409 (3.875" stroke, 5.85" rods). I always thought the maximum bore you could safely go before hitting water was about .060"?
What about combining the two for a 4.100" bore, a 4" stroke, and 5.85" ProMod rods? Based on the displacement formula, this should yield a 422 correct?
Thoughts?
I know SonnyinVA has a 409 (4" crank, 5.850" rods with a 4.030" bore), and based on this article - TPiS 409 TPiS did a 4.100" bore on a LT1 for a 409 (3.875" stroke, 5.85" rods). I always thought the maximum bore you could safely go before hitting water was about .060"?
What about combining the two for a 4.100" bore, a 4" stroke, and 5.85" ProMod rods? Based on the displacement formula, this should yield a 422 correct?
Thoughts?
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Rod length has nothing to do with it. It's a consideration but ultimately it only affects your piston choice, not displacement.
That being said you can use this spreadsheet and play with bore and stroke all you want.
http://www.wku.edu/~nathan.plemons/calc.xls
That being said you can use this spreadsheet and play with bore and stroke all you want.
http://www.wku.edu/~nathan.plemons/calc.xls
Le Mans Master
Joined: Jan 2000
Posts: 6,595
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From: Thornton CO
Judging by how thin my cylinder walls were when the rod went through the side of it with only a .030 bore, I don't think I would bore it more than .040 on an LT1 block.
That's quite the spreadsheet Nathan - thanks for posting that.
That's quite the spreadsheet Nathan - thanks for posting that.
Safety Car
Joined: May 2003
Posts: 4,283
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From: Houston Texas
There was a guy down here who had a shop called CXI who had a 421 LT1. He used to run alot of nitrous through it(400hp supposedly) He had a valve train failure that ended up destoying motor. He is in jail now for ripping people off.
Melting Slicks
Joined: Jul 2000
Posts: 2,112
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From: Peoria IL
Originally Posted by BAM92
There was a guy down here who had a shop called CXI who had a 421 LT1. He used to run alot of nitrous through it(400hp supposedly) He had a valve train failure that ended up destoying motor. He is in jail now for ripping people off.
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,710
Likes: 1
From: Green Bay WI
Rod length has nothing to do with it. It's a consideration but ultimately it only affects your piston choice, not displacement.
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,710
Likes: 1
From: Green Bay WI
Originally Posted by Timmy!
Judging by how thin my cylinder walls were when the rod went through the side of it with only a .030 bore, I don't think I would bore it more than .040 on an LT1 block.
That's quite the spreadsheet Nathan - thanks for posting that.
That's quite the spreadsheet Nathan - thanks for posting that.
Drifting
Joined: Dec 2000
Posts: 1,255
Likes: 50
From: Clayton, NC north carolina
The only way to be safe is to sonic test a block before you have it bored. you could possibly have the block sleved to accomidate a uniform cylinder. Try Darton Sleves to see if they make anything like this. By the way sleving a block is not cheap.
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Race Director
Joined: Dec 2002
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by cprgmr
Interesting - I wonder how some get away with going .060" much less .1?
Larry
code5coupe
Le Mans Master
Joined: Jan 2003
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From: Portland Oregon
Originally Posted by ASRoff
The only way to be safe is to sonic test a block before you have it bored. you could possibly have the block sleved to accomidate a uniform cylinder. Try Darton Sleves to see if they make anything like this. By the way sleving a block is not cheap.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by ASRoff
The only way to be safe is to sonic test a block before you have it bored. you could possibly have the block sleved to accomidate a uniform cylinder. Try Darton Sleves to see if they make anything like this. By the way sleving a block is not cheap.
Team Owner
Joined: Mar 2001
Posts: 30,846
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From: Boston, Dallas, Detroit, SoCal, back to Boston MA
I've seen people pour epoxy into the coolant passages so they could notch for a bigger stroke. But by the time you get through I think your better off getting a turbo or a blower
My 2c
