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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

12.79:1 compression on pump gas??

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Old Aug 22, 2012 | 01:55 PM
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Default 12.79:1 compression on pump gas??
Anyone running 12.7ish:1 at the pumps?
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Old Aug 22, 2012 | 01:57 PM
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I am.
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Old Aug 22, 2012 | 02:00 PM
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It can be done. What's your DCR?
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Old Aug 22, 2012 | 02:38 PM
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Originally Posted by lt1_2buku
Anyone running 12.7ish:1 at the pumps?
Yea, it didn't much care for the summer. It loved 104 from the pump but 97 worked.
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Old Aug 22, 2012 | 02:47 PM
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Yup! Just choose the right cam
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Old Aug 22, 2012 | 05:56 PM
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It's an LE 242/248 110lsa 580ish lift. It's the cam LE Spec'd for my 383 build. Man I thought that just seemed high for street oh well. Will a stock starter eventually go out starting something with 12.5+?
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Old Aug 22, 2012 | 06:27 PM
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I am at 12.8 as well. Runs fine on pump gas. Its not the car in my sig.
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Old Aug 22, 2012 | 06:47 PM
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Man I want that hood^^^^
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Old Aug 23, 2012 | 07:26 AM
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Tuner needs to know what he is doing.

Stock starter is a nice gear reduction piece, just give it a larger feed cable and it will be fine.

I know it doesn't "look" like a gear reduction starter but it is.
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Old Aug 23, 2012 | 08:02 AM
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your sure as hell pushing it but get a GOOD tuner that knows his **** and you'll prob be ok long as you dont have a cam with like 0 overlap lol
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Old Aug 23, 2012 | 08:28 AM
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With a fairly mild 236/244 112 cam my old 396 ran great with 12.25:1 so i think youll be good.
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Old Aug 23, 2012 | 10:43 AM
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Well I Got a mail tune from Ion. I got the tune hoping it with get me to the nearest LT1 turner (about 2hrs away). Think it will be ok with that tune driving for 120 miles? Or should I just rent a trailer? Good to know about the starter thanks 96caprice.
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Old Aug 23, 2012 | 04:51 PM
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I do agree a good tuner needs to be used as well.

And no you cant have my hood!! Lol
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Old Aug 23, 2012 | 09:33 PM
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Can you just mill the heads or do you have to design a cam around the designated CR?
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Old Aug 24, 2012 | 08:15 AM
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If I milled the heads I thought it would increase the compression? Is this backwards? I guess I could just go with a thicker gasket if I needed to lower it.
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Old Aug 24, 2012 | 04:46 PM
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Originally Posted by lt1_2buku
It's an LE 242/248 110lsa 580ish lift. It's the cam LE Spec'd for my 383 build. Man I thought that just seemed high for street oh well. Will a stock starter eventually go out starting something with 12.5+?
Just curious, what heads are you running for this build?
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Old Aug 24, 2012 | 05:27 PM
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Running an LE2 set of stock casting heads 54cc. LE did say this cam loves high compression. I just wanted to know if I need to only run high octane or if 93 would be ok.
Last edited by lt1_2buku; Aug 24, 2012 at 10:44 PM.
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