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Old 08-06-2012, 01:27 PM
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383 LT1 what ring gap?

On my way to pick up my new block from the machine shop.

its a 383 lt1 (modern) with 11.88 compression. I'm shooting for 550 whp. the motor is a weekend warrior and will start to see a 125hp shot of nitrous later in the season. what would you set the ring gap at?

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Old 08-06-2012, 02:15 PM
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383 LT1 what ring gap?

On my way to pick up my new block from the machine shop.

its a 383 lt1 (modern) with 11.88 compression. I'm shooting for 550 whp. the motor is a weekend warrior and will start to see a 125hp shot of nitrous later in the season. what would you set the ring gap at?
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Old 08-06-2012, 02:32 PM
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Pretty good info here: www.aa1car.com/library/ring_end_gap.htm
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Old 08-06-2012, 02:42 PM
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dont forget to add for the NO2
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Old 08-06-2012, 07:20 PM
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Quote:
Originally Posted by vinniekq2 View Post
dont forget to add for the NO2
You won't need to alter the ring gap if you are only planning a sub 200 shot. Once you get addicted to the sauce and want to put the big boy jets in, then ring gap becomes critical.
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Old 08-06-2012, 07:34 PM
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thanks for all the replies.

Joelster - for this season i'm limiting it to 125hp worth but next year its game on. I'll be competing in a LTX shootout and going into the power adder class and running 350 direct port shot. For this season its just going to stay at 125 and making sure i can get the power to the ground. Would you say gap for the 350 now or at the end of the season when i tear it down?
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Old 08-06-2012, 08:40 PM
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I'd run plasma molys and set the gap .008- .010 top .009-.012 second
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Old 08-06-2012, 09:08 PM
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This is a double post.........and .008-.010 top .009-.012 second???????????????? he's going to run nitrous!
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Old 08-06-2012, 09:26 PM
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exactly he didn't ask for piston clearance he asked for ring gap and plasma molys can be run alittle tight
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Old 08-06-2012, 10:46 PM
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IMHO, I second those gaps are too tight, especially for nitrous, and even a NA.

JE recommends:

Street turbo or nitrous, bore x .0050, bore x .0055 1st and 2nd rings and .015 oil. That's .020 and .022 for a 4.030 bore.

Nitrous race only even wider, .0070 and .0065 per inch of bore.

If you wanted tightening them up a bit, I would never go tighter than .0040 and .0045, top and second ring with NOS regardless of the ring material. Myself, I wouldn't deviate from the manufacturers recommendation.
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Old 08-07-2012, 05:23 AM
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The merge is complete.

I'm on board with 68's recommendation unless the pistons are KB Hypereutectic's in which case you need even more gap on the top ring.

What type piston are you going with?
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Old 08-07-2012, 07:03 AM
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Thanks for the replies everyone.

68nova - I'll call the manufacturer today and see what they recommend.

engineczar - The pistons are forged JE -5cc flattops. then for the rest of the bottom end a Callies magnum XL crank and H beam rods.

Last edited by Eric63M; 08-07-2012 at 07:10 AM. Reason: put the wrong crank in
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Old 08-07-2012, 07:33 AM
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I'd get a set of gapless from total seal. they work great and pick up a few hp. i run then in my more serious builds.
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Old 08-07-2012, 07:03 PM
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Quote:
Originally Posted by Eric63M View Post
thanks for all the replies.

Joelster - for this season i'm limiting it to 125hp worth but next year its game on. I'll be competing in a LTX shootout and going into the power adder class and running 350 direct port shot. For this season its just going to stay at 125 and making sure i can get the power to the ground. Would you say gap for the 350 now or at the end of the season when i tear it down?
This shootout?????


^^my car is the camera car. Might not be a shootout next year. Run it N/A this year and I will see you in Mod N/A!
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Old 08-07-2012, 07:40 PM
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That is the shootout. Don't think this year is going to happen unfortinatly. After all the set backs and going extremely over budget on this build I'm not sure if it will be together in time, this is how its sitting so i still need to tune it massively, and dial in the rear suspension.



Next year for sure will be competing, this year if possible i will trailer it out and see. What is the index for mod N/A and any restrictions? I'm sitting with a S60, twin plate clutch, stage 4 t56, 10pt cage, and this engine i'm building. and only weigh in at 3085lbs with my last engine (without me) so 3300 with me in it roughly. Any fuel limitations?

btw your car sounds good, which cam do you have in there?
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