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5.3 short block/ ls1 head

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Old Feb 13, 2009 | 11:07 AM
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Default 5.3 short block/ ls1 head
hi will a 243 zo6 head work on a 5.3 trunk motor/ will the valves clear the small bore?
thanx thomas.
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Old Feb 13, 2009 | 12:43 PM
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+1, It will work fine. You may want to mill down the heads because the increase air flow might be negated by the CR drop. Don't know how much to mill it though, maybe someone will chime in or I would contact a machine shop that knows LSx motors and ask them.
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Old Feb 13, 2009 | 01:16 PM
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The 07+ 5.3Ls all get 243s. And they have the 2.00 1.55 exhaust valves.
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Old Feb 13, 2009 | 02:07 PM
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Default 5.3
thanx keep the info coming! what type of power can you make with it!
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Old Feb 13, 2009 | 02:15 PM
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Originally Posted by one fast zo6
thanx keep the info coming! what type of power can you make with it!
With modding the 5.3 in general, or just from the head swap alone? If you mill the heads so that there was no drop in CR, I'd say you could expect 15 rwhp.

I would hope that you are going to be changing the cam at the same time you are changing your heads.
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Old Feb 13, 2009 | 04:27 PM
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Default 5.3
yes i have a GM hot cam, zo6 valve springs, rollmaster dual roller timing chain and want to mill the heads .025. i hope it will make 330 rwp
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Old Feb 13, 2009 | 04:36 PM
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should make more then that man!
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Old Feb 13, 2009 | 05:45 PM
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Im putting a set of 241s on my 5.3 but im boosting it so the lower compression will help me out some.
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Old Feb 13, 2009 | 06:02 PM
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Originally Posted by Taubr Unit
Im putting a set of 241s on my 5.3 but im boosting it so the lower compression will help me out some.
Sell the 241's and pick up some 317's. It will flow more and drop your CR more. Also pick yourself up a LS6 cam. It is a very good budget boost cam. Doing those things will allow you to run more boost safely...and make more power.
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Old Feb 13, 2009 | 06:14 PM
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well i already got the 241s with only 20k on them for $50, cant pass that up, and i plan on getting a cam, just a little bigger then the z06 cam. Thanks for the suggestion thou!
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Old Feb 13, 2009 | 06:19 PM
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Originally Posted by Taubr Unit
well i already got the 241s with only 20k on them for $50, cant pass that up, and i plan on getting a cam, just a little bigger then the z06 cam. Thanks for the suggestion thou!
I'd still sell them and get the 317's. It's a much better choice. Ask the boosted guys, they'll tell you. You can pick up a set for $250 or less.
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Old Feb 15, 2009 | 02:40 AM
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not tryin to hijack ure thread but i did sell the 241 heads and picked up a set of 317s, lol. Should put a 5.3 around 8.5-1 comp.
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