4.25" stroke on a LS7

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Dec 29, 2006 | 01:40 PM

aTX427

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4.25" stroke on a LS7

Is it possible? I am getting trigger happy on a new build and don't want to wait or deal with the hassle of a tall deck.

Dec 30, 2006 | 11:41 AM

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by john_sblendorio

Is it possible? I am getting trigger happy on a new build and don't want to wait or deal with the hassle of a tall deck.

Not really, this combination would "hit" everything inside the case and require, among other things: (1) special rods that are "smallish" on the big end to clear the cam lobes and cylinders, (2)tons of mallory metal to balance (3) pistons with short comp height

Dec 30, 2006 | 07:25 PM

aTX427

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What is the max stroke on the LS7 without needing a custom rotating assembly? 4.000, 4.100 or 4.125?"

Dec 30, 2006 | 08:16 PM

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by john_sblendorio

What is the max stroke on the LS7 without needing a custom rotating assembly? 4.000, 4.100 or 4.125?"

4.100 is the best cost solution for a crankshaft - Eagle

add that to 4.125" bore and depending on the cam & heads, it's a ~600 plus RWHP package.

Dec 30, 2006 | 09:27 PM

excessive81

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Joined: Jan 2006

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From: indianapolis indiana

as axel rose says.....paitence, just a little paitence

Dec 31, 2006 | 05:25 AM

aTX427

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Thanks Charlie

Dec 31, 2006 | 07:15 AM

timd38

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Joined: Aug 2005

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From: Hudson WI

NCM Sinkhole Donor

Get a GM LS-X block and you can go to 500CI.

Money buys speed, how fast do you want to go?

Dec 31, 2006 | 01:45 PM

aTX427

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The LS7 is just easier and much less expensive.

Last edited by aTX427; Dec 31, 2006 at 10:50 PM.

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Jan 1, 2007 | 02:24 PM

SpinMonster

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Joined: Mar 2003

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From: Colorado Springs, CO

St. Jude Donor '08-'09-'10-'11

Quote:

Originally Posted by john_sblendorio

What is the max stroke on the LS7 without needing a custom rotating assembly? 4.000, 4.100 or 4.125?"

Once you change the crank to even a 4", then you must change everything else. The pistons and connecting rods are specific to the stroke.

Buy a shortblock from a known buuilder instead of trying to reinvent the wheel.

Jan 2, 2007 | 01:50 AM

#10

ToSlowForU

Racer

Joined: Feb 2004

Posts: 465

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From: Conroe TX

Quote:

Originally Posted by SpinMonster

Unless the world has changed over night the LS7 comes with a 4" crank and a 4.125" bore. I have seen people go with the 4.250" in LS1 stuff with no problems other than the short compression height. If you did a 4.125" stroke, you would be looking at a 441 ci or so. Honestly the 4.125" crank used to be popular in LS1's. I ran 9's with an iron block 427 but I always felt that the stroke was just too much.

Jan 2, 2007 | 03:46 PM

#11

aTX427

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Just curious why you would say too much stroke? Piston velocity or rotating assembly geometry causing cylinder wall wear? I figured I would try to get as much displacement as possible with the block as hand.