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Generation III Internal Engine 1997-2006 LS1 | LS6
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MS4 work with stock 243 heads on an LS1?

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Old 04-23-2010 | 12:13 PM
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Default MS4 work with stock 243 heads on an LS1?
Anyone running this setup?
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Old 04-23-2010 | 12:50 PM
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I have hand ported 243s on my ls1 with the ms4. But i have a 383 shortblock.
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Old 04-23-2010 | 08:16 PM
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I think the combustion chamber is too small and the pistons will hit the valves.. but im not 100% sure.
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Old 04-23-2010 | 08:21 PM
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It SHOULD clear stock valeve size and MLS gasket and no milling...
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Old 04-23-2010 | 08:28 PM
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SOM is correct.

Get yourself some 42's and a good tune and have fun!
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Old 04-23-2010 | 08:37 PM
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Originally Posted by SOMbitch
It SHOULD clear stock valeve size and MLS gasket and no milling...
haha SHOULD is the key word here......i know of quite a few cam only ls1s running a MS4 but i personaly would feel alot better if it were my car to have the PTV clearance checked. just my .02
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Old 04-23-2010 | 08:51 PM
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A buddy of mine is running this exact combo (stock, unmilled 243s), but with a cam that big, I would still check PTV since the heads will be off anyway. It'll take 10 minutes.
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