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Looking to Increase Compression ????

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Old Dec 6, 2007 | 09:42 PM
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Question Looking to Increase Compression ????
I have a stock Ls1 with a 232/232 .598 112 LSA and I want to Increase Compresion to stay close to 11:1
I got a set of cometic .045 Head Gaskets and I want to get the heads (241) milled but I don't know how much (.020 or .030) and if I'll need to change the Pushrods to 7.350 or stay with 7.400 ???
Any Help will be Very Apreciated !!!!

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Old Dec 7, 2007 | 12:48 AM
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Old Dec 10, 2007 | 08:43 AM
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You'll have to measure PTV to make final decision.
I would measure with the Cometics and based on that measurement (intake/exhaust) decide on how much to mill while staying safe.
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Old Dec 10, 2007 | 08:46 AM
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Thanks man !!! what will be a good safe clearance ??? and how do I calculate the preload on the pushrods ???
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Old Dec 10, 2007 | 09:14 AM
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If you use minumum PTV clearances of 0.080 on the intake and 0.100 on the exhaust you should be good to go. Use this for any engine you build.
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Old Dec 10, 2007 | 12:00 PM
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Originally Posted by mighty-z28
Thanks man !!! what will be a good safe clearance ??? and how do I calculate the preload on the pushrods ???
As mentionned .080 Int/ .100 Exht

As for the p-rods you'll need to measure with a adjustable p-rod checker and once you have the measurement at 0 lash you add .070>.080 preload on that if you're running stock lifters (or Comp 850-16 for that matter)
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Old Dec 10, 2007 | 02:52 PM
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You could always give Patriot a call and order a set of stock casting 243 heads for about $400 and switch all your parts over to those.
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Old Dec 10, 2007 | 05:09 PM
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Originally Posted by Beaflag VonRathburg
You could always give Patriot a call and order a set of stock casting 243 heads for about $400 and switch all your parts over to those.
Hey !!! aren't the valves bigger on the 243's ???
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Old Dec 10, 2007 | 05:51 PM
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I think they are the same size as 241's or other ls1 heads
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Old Dec 11, 2007 | 12:36 AM
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Forget it !!! To much trouble for a little gain... I'll just mill them 0.010 with the 0.045 Cometic Gasket so I'll not have any PTV problems or Pushrods to change... Thanks for your help anyway !!!
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Old Dec 11, 2007 | 01:37 AM
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Listen to Predator Z. Measure how much clearance you have now and then design and build your next heads
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