Swapping a 6.0 ls into a G body

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johnnunez29

Greasemonkey
May 9, 2022
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Exactly.


The post above another guy sees it as well. You say two different things.


Pretty sure even the small bore LS7 Heads from MAST need a 4" bore.

If this guy is building something with a 3.900 hole in it, cathedral head all day but we shall see..
The heads I have are the small bore ls7 heads.
 

Built6spdMCSS

Geezer
Jun 15, 2012
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Ok that clears it up. Yea you can take a 6.0l factory block .030 over with no issues.

I built a couple of 408ci setups, but that was a 4.030" bore, 4.0" stroke.
 
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johnnunez29

Greasemonkey
May 9, 2022
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Ok that clears it up. Yea you can take a 6.0l factory block .030 over with no issues.

I built a couple of 408ci setups, but that was a 4.030" bore, 4.0" stroke.
pretty much what im doing. only went 3.900 stroke because l8t crank comes in that and less travel in the cylinder. Some of info i found said it is a safer stroke for the cylinder walls. Something about ovaling due to the piston coming out too far tha the bottom. guess ill find out .
 

johnnunez29

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May 9, 2022
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The Piston does travel down a hair too far and it rocks on the skirt. I'm curious how much a difference that 3.9 Crank would be.
sh*t. Me too lol. From my reading looks like the ring will stay completely within the piston. May not be too much a difference. Guess we’ll see. Should be a longevity thing more than performance .
 

64nailhead

Goat Herder
Dec 1, 2014
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sh*t. Me too lol. From my reading looks like the ring will stay completely within the piston. May not be too much a difference. Guess we’ll see. Should be a longevity thing more than performance .
Long stroke is not longevity prone. Especially with a 2618 piston at .005-.006" piston to to wall clearance. Ask me how I know.
 
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johnnunez29

Greasemonkey
May 9, 2022
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Long stroke is not longevity prone. Especially with a 2618 piston at .005-.006" piston to to wall clearance. Ask me how I know.
Would 3.900 be considered a long stroke? Stock is 3.622. Most my reading lead me to 3.900 being a bit safer than 4.000. Obviously not bullet proof.
 
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64nailhead

Goat Herder
Dec 1, 2014
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Would 3.900 be considered a long stroke? Stock is 3.622. Most my reading lead me to 3.900 being a bit safer than 4.000. Obviously not bullet proof.
You'll be using a short skirt piston which is much more unstable in the bore than a conventional piston. What piston are you planning to use (part number)?
 

johnnunez29

Greasemonkey
May 9, 2022
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You'll be using a short skirt piston which is much more unstable in the bore than a conventional piston. What piston are you planning to use (part number)?
No clue. Wiseco . Had to be semi custom ordered. Ordered through mast, said it was 6 wks leed time … almost 7 weeks ago 🤷🏼‍♂️
 
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