need help on what pistons to go with.

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Jun 5, 2011 | 04:07 AM

tyler ovel

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need help on what pistons to go with.

Well I have a stock ls1 with a mild cam and some patriot 243 ls6 heads, and I'm looking to forge the bottom end to take a good shot of nitrous but don't know exactly what pistons specifications to go with or what they mean such as flat top or dish, _2cc valve relief? And so on...... so if someone could help and explain this a little I would appreciate it. Thanks

Jun 5, 2011 | 11:55 AM

oakley6575

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Where do you want your compression to be at? Will it run on 93?

Jun 5, 2011 | 01:15 PM

tyler ovel

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Ok Well Im running 10.5:1 to 10.8:1 right now and would like to run 10.8:1 or 11.0:1 cuz I do live In calidfornia and I need to pass smog still. And I will be running 91 octain because that's all California sells at the pump lol.

Jun 6, 2011 | 02:37 AM

PREDATOR-Z

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WISECO 2cc valve relief with nitrous rings. You'll have to hone to 3.903

Jun 6, 2011 | 08:47 AM

mark21742

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Quote:

Originally Posted by PREDATOR-Z

WISECO 2cc valve relief with nitrous rings. You'll have to hone to 3.903

Is the hone the reason most forged blocks are considered 347s instead of 346?

Jun 6, 2011 | 09:28 AM

Sales4@Texas-Speed

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Yes the hone will pick you up an extra cubic inch. I also say Wiseco pistons. They have a 3.903 bore" 3.2cc valve relief piston that comes with a nice steel top ring/napier 2nd that can handle a lot of nitrous. Pair it up with a nice rod and an ARP main stud kit and you should be good to go.

Jun 6, 2011 | 10:33 AM

tyler ovel

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Hey thanks guys. Now do you know if I have to buy the rings separate or do they come with the pistons. Thanks

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Jun 6, 2011 | 01:35 PM

tyler ovel

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Quote:

Originally Posted by JohnJanz@Texas-Speed

The rings come with the Wiseco pistons now, comes as a package deal.

so what is the difference between a -2cc valve relief and a -3.2cc?

Last edited by tyler ovel; Jun 6, 2011 at 01:58 PM.

Jun 6, 2011 | 02:26 PM

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Sales4@Texas-Speed

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-3.2cc is just a little bit larger of a relief, which results in a little less compression. But you have all the room you need to mill the heads and get it back.

Jun 6, 2011 | 04:12 PM

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tyler ovel

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Quote:

Originally Posted by JohnJanz@Texas-Speed

-3.2cc is just a little bit larger of a relief, which results in a little less compression. But you have all the room you need to mill the heads and get it back.

ok well I already have 59cc heads and don't really want to mill the heads so would -2cc valve relief get me to 10.8-1 or 11.0-1 compression with 59cc heads? Thanks again for the info

Jun 6, 2011 | 04:14 PM

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oakley6575

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Use a compression calculator online somewhere. Just input your exact specs and it will give you your static compression.

Jun 6, 2011 | 04:44 PM

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Sales4@Texas-Speed

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Quote:

Originally Posted by tyler ovel

ok well I already have 59cc heads and don't really want to mill the heads so would -2cc valve relief get me to 10.8-1 or 11.0-1 compression with 59cc heads? Thanks again for the info

With a stock thickness gasket you will be at 10.84:1. This is with a 59cc chamber in the heads and a -3.2cc valve relief in the pistons.