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Lq9/Ls2 bottom end with L92/Ls3 top end swap. Need help!

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Old 11-14-2013, 10:05 AM
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Default Lq9/Ls2 bottom end with L92/Ls3 top end swap. Need help!

hey guys Im in the middle of my swap. just registered over here today. My lq9 block is similar to the ls2 with flat tops. I wanted to know what type of Ls2 setups are the fellas runing? Ive been doing some searching and Im lost.

The 823s I was planing to have them Milled down .030th To get my Lq9 to Ls2 compression area. But here is the kicker. My cam is a Comp cam 227/235 .614/.621 ! on a 113 lsa center 109. Will this cam still work with this combo with my heads shaved .030 runing the stock head gaskets or some .040-.045 gaskets.

The extra compression will help my truck get down the road.

Will I have PTV clearance problems? Im going to order pushrods last after I get someone to measure them.

I need to know what I have to do, If I need a expert to check for PTV clearance or what.
Old 11-14-2013, 02:29 PM
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LS3 valves are a bitch for clearance. Even on the LS3 you run into PtV issues and they have valve reliefs in the pistons.

You most definitely need to check.
Old 11-14-2013, 03:02 PM
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I know this, but I keep reading the Ls2 guy shave to maintain their stock compression, and I have seen them runing cams this size even bigger duration on some, but my lift of .621 on the exhaust is what concerns me.



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