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FI 99 ls1 help

   
Old Feb 23, 2014 | 10:42 AM
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Default FI 99 ls1 help
okay so I am buying a compete stock ls1 with 16k miles on it and planning on boost. my question is what has to be done to bottom end to hold 4-6 psi of boost, looking to stay in 400-550 hp range.. I know the heads that are on it are 853
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Old Feb 23, 2014 | 11:22 AM
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Originally Posted by jhoff99
okay so I am buying a compete stock ls1 with 16k miles on it and planning on boost. my question is what has to be done to bottom end to hold 4-6 psi of boost, looking to stay in 400-550 hp range.. I know the heads that are on it are 853
Nothing, i put 20k miles on my stock engine with 12ish boost. 4-6 lbs is peanuts. If; no when you start upping the boost i would recommend adding a meth kit to cool down intake air on a stock engine. My stock heads were 799 i was around 550 ish with 1 7/8 kooks headers and full GHL exhaust. Don't worry about 4-6lbs you can run that all day.
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Old Feb 23, 2014 | 11:52 AM
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You shouldn't need to worry about the bottom end till you hit the 600whp mark.
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Old Feb 23, 2014 | 12:33 PM
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Just make sure your fuel system is up for the task and the tune is on... Let her eat.

4-6 #'s really is nothing, I would start at 8 #'s and see how it goes.
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Old Feb 23, 2014 | 01:40 PM
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Bone stock. I ran a 5.3 absolutely bone stock up to around 12psi with a Master Power 70 before issues like valve float pop up.
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Old Feb 23, 2014 | 02:04 PM
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you could do springs and pushrods and boost it to the numbers you want, kind of what i want too, just a mild boost setup
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Old Feb 24, 2014 | 10:01 AM
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Originally Posted by helga203
Nothing, i put 20k miles on my stock engine with 12ish boost. 4-6 lbs is peanuts. If; no when you start upping the boost i would recommend adding a meth kit to cool down intake air on a stock engine. My stock heads were 799 i was around 550 ish with 1 7/8 kooks headers and full GHL exhaust. Don't worry about 4-6lbs you can run that all day.
I have a spare water meth kit i am going to put on there. But will the 853 heads handle the compression or should i get 799 off a 5.3l
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