LS1TECH - Camaro and Firebird Forum Discussion

LT1-LT4 Modifications 1993-97 Gen II Small Block V8

4.040 bores inside please?

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Old Nov 13, 2006 | 11:35 AM
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Default 4.040 bores inside please?
Just wondering how many of you are 40 over , do you have any problems?
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Old Nov 13, 2006 | 11:54 AM
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Why would ya have any probs?
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Old Nov 13, 2006 | 12:43 PM
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just heard it's not rec. Something about coolant passages.
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Old Nov 13, 2006 | 12:49 PM
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lol...coolant passages? No worries there.
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Old Nov 13, 2006 | 02:22 PM
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cool, 40 it is. Big Show, I wanted to clean up the dech surface a little maybe .010. Do I need to have the small squigly portion of the block milled a little too?
Last edited by Vicious95Z28; Nov 13, 2006 at 03:15 PM.
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Old Nov 13, 2006 | 03:32 PM
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Small squigly, is that the industry term

Pretty sure you can go .060 since someone I just saw on here is running a 389 stroker. I think .040 is 385 and then .060 should be 389
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Old Nov 13, 2006 | 03:34 PM
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385 here and lovin it! 12.2 to1 compression hating that 101 octane gets expensive
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Old Nov 13, 2006 | 04:03 PM
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well with a 3.750" cranck stroke and .30 over you can have a 383 and with a 3.875" crank stroke with the same bore its a 396 so what would it be with a .40 over and a 3.875 stroke. 400??
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Old Nov 13, 2006 | 04:44 PM
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Lets see if I did my math correctly...I came out with a 398ci. (just rounded it off) and 6.51 liters. Anyone else get something diffrent?
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Old Nov 13, 2006 | 04:57 PM
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I got 389.6ci using Desktop Dyno with 4.000 bore and 3.875 stroke. 4.030 bore, same stroke is 395.4ci, and 4.060 is 401.3ci. If you can fit 400 pistons in a LT1 (4.125") then you get 414.3ci

Whats the 3.875 coming from? 6" Rods on the stroker crank?
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Old Nov 13, 2006 | 10:09 PM
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I found it while doing research on building a stroker it is on
http://www.cmotorsports.com/93-97-fbody/engine.html
yes it does use 6" rods.
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Old Nov 14, 2006 | 10:51 AM
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[QUOTE=Formula350]Small squigly, is that the industry term

Sure All the top notch engine builders use it
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Old Nov 14, 2006 | 11:37 AM
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OH You mean the front and rear intake seal surface heh I do think that needs to be milled as well.
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Old Nov 14, 2006 | 04:02 PM
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Originally Posted by Formula350
OH You mean the front and rear intake seal surface heh I do think that needs to be milled as well.

Yes, I thought so too
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Old Nov 14, 2006 | 04:22 PM
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what are the power diffrence with a using a 3.750 crank and 5.7 rod to using a 3.875 crank and a 6.0 rod? Just wondering looking into a stroker motor
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Old Nov 14, 2006 | 05:27 PM
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A buddy of mine had a z28 with 060.bore and it ran great,didn't overheat,was 398,12.5 motor.
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Old Nov 14, 2006 | 05:35 PM
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6 inch rod not 6L's rod, sorry. Unless I am mistaken lol but I don't think so o_0 The difference is more stroke for more power.
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