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Old 08-21-2013, 06:19 AM
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Octane Rating For 383 Stroker?

I have a '78 Vette with a 383 Stroker that was installed in 2010. A guy at a car show told me that I need to add octane booster to my non-ethanol 91 octane gas that I've been using. The engine has a 10.1 comp rating. Opinions welcome. Thanks.

Bob

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Old 08-21-2013, 06:42 AM
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How does it run? Aluminum heads or iron? Cam specs, timing, etc.
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Old 08-21-2013, 06:48 AM
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10:1 with a turbo is going to be less than perfect in most aspects.
need engine specs,
turbo size
boost pressure.

octane boost in a can is not a good investment.
what other types of fuels are available other than 91?
do you have fuel injection or a blow through carb?
do you have any electronics?
intercooler?
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Old 08-21-2013, 07:14 AM
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Quote:
Originally Posted by vinniekq2 View Post
10:1 with a turbo is going to be less than perfect in most aspects.
need engine specs,
turbo size
boost pressure.

octane boost in a can is not a good investment.
what other types of fuels are available other than 91?
do you have fuel injection or a blow through carb?
do you have any electronics?
intercooler?
Hey Vinnie.... Were do you see "turbo"?
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Old 08-21-2013, 02:11 PM
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More Info...

First off, I'm not a mechanic. I had all the mod work done by a hot rod shop in Central NY.

Here are the specs I was given for the 383 crate engine:

383 Crate Engine 420 HP Stroker Ceramic Headers MSD Distributor MSD 6A1 Box MSD Wires Intake Manifold Edelbrock 750 Carb Air Cleaner Trans Lines Be Kool Radiator Fan Sensor Flex Plate Fuel Pump Starter Balancer Water Sensor Exhaust System AC Idle Boost
I can't tell you the timing or cam info. BTW, it doesn't have a turbo.

Re the gasoline in this area (Syracuse, NY), the highest octane rating I can find is 91 and only a few gas stations are selling the non-ethanol 91 octane premium which is what I'm using.
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Old 08-21-2013, 02:36 PM
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Do you know the deck height, the pistons used, the cc of the head and the Head gasket?

that's the only way to determine if its a 10 to 1 engine.

I have an iron headed 383 Small block Chevy that has exactly 9:78 to 1 compression and I have no issues running it on 87 octane.
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Old 08-21-2013, 02:44 PM
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Quote:
Originally Posted by 1000hp View Post
Do you know the deck height, the pistons used, the cc of the head and the Head gasket?

that's the only way to determine if its a 10 to 1 engine.

I have an iron headed 383 Small block Chevy that has exactly 9:78 to 1 compression and I have no issues running it on 87 octane.
No, the shop that did all the work told me that it was 10:1 compression. That's all I can tell you. Thanks.
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Old 08-21-2013, 02:54 PM
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I have a 9:7 to 1 383 stroker with aluminum heads and use 92-93 octane.

Octane boosters are falsely advertised. They raise it POINT 1, 92 would become 92.1. That wont help at all

Theres many factors involved. Your total timing could cause a ping. 36' or less id guess. Spark plugs too can also prevent or cause ping. Sparks plugs have a temperature rating of sorts. A colder plug can help prevent detonation as well.

Higher octane would be better even if its ok with lower octane. Id vote for 92 or 93 if you can get it
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Old 08-21-2013, 03:12 PM
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Have you tried the lower octane fuels to see if the engine likes them?

91 octane should be good enough!

Also take all advice with a grain of salt because that's all it is, advice and not a fact!
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Old 08-21-2013, 03:14 PM
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Are you asking this question becase there is a problem with it like a pinging sound, or because someone told you that you needed octane boost ? myself if the timing and everything is set correctly it should do fine with the 91 octane if thats all you can find in your area. JMO
if it's performing good no noise or anything your alright . JMO again.

Cole
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Old 08-21-2013, 06:27 PM
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I don;t think you are looking very hard.
Delta Sonic stations often sell 100 octane Cam2 (2 in Syracuse)
Most all the Sunoco stations have 93 octane gas there.

Why does someone else need to tell you what gas you need to use?
Can you not figure this all out for your self?
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Old 08-21-2013, 07:49 PM
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rvnmedic6869
sorry about the turbo post,I was thinking of another posting about turbos,,, what Fbird said,there are usually some other places(race tracks) that sell higher octane fuels.

100hp has a 383 that runs on 87 so maybe your engine is ok. I like to use a chasis dyno to tune the engine at least one time. You can tell when the engine gets too much timing and the power drops
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