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Old 05-07-2011, 09:46 AM
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Ignition Timing on a 383 for Marine Use

I finished getting my sbc 383 together and now the engine is on my test stand. I have never really done much with a carb'ed engine with a manual distributor. I am curious of what my timing should be set at and taking proper procedures to do it. Do I need a timing light with advance? The engine has a BID (Breakerless Integral Distributor) Ignition. With the stock coil.

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Old 05-07-2011, 10:20 AM
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marine ignition curves are very similar to street just without the vacuum. My 350 marine vortec is timed at 10 degrees with 34 total. The curve is set to start coming in at around 1800 and all in by 3500.
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Old 05-07-2011, 10:22 AM
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What heads, compression, and cam?
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Old 05-07-2011, 11:06 AM
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In a marine application that runs full throttle for a long time you want about 2 to 4deg less timing than the amount of timing that makes best/most horsepower (like from a quick dyno pull or 1/4mile blast)

If you are going to force the marine motor to run on crap 87 octane gas, use even less timing. (28-32) Testing with a radar gun will show you whats best.
Excessive advance should be avoided.

A high performance engine needs a high performance fuel.
If you are going to run it had, put good fuel in the tank.
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Old 05-07-2011, 12:33 PM
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062 vortec heads, 9.35 compression, I am not really sure what the cam is, the cam is what I took out of the stock 305 engine. I planned on running 89 octane in my boat, should I be running something different?
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Old 05-07-2011, 01:04 PM
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Quote:
Originally Posted by crussell85
062 vortec heads, 9.35 compression, I am not really sure what the cam is, the cam is what I took out of the stock 305 engine. I planned on running 89 octane in my boat, should I be running something different?
Why would you want to use the stock 305 cam in this motor?
Why would you use a used cam in this motor?

Give your head a shake.

I recomend 92 octane fuel. A high perf boat needs a high perf fuel.

Running crap gas in a high perf boat is like running crap oil in the pan.
You need the octane protection of a 92 octane gasoline for this one.

Ditch the cam, get a real, new cam and lifters.
A stock cam will choke this motor.

What is the boat? what is the drive and prop?
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Old 05-07-2011, 02:28 PM
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the cam is a hydraulic roller cam, before I built this engine I had another thread going and they were telling me to run the 305 cam in the 383. The drive is a volvo penta sx drive with a 1.66 gear ratio. The prop is still up in the air. I have to get a new prop for it anyways because the aluminum prop on the boat is pretty beat up. The boat is a 2001 Glastron GX205.

The cam that I was going to originally run in this boat is this
http://www.cranecams.com/product/car...detail&p=24200

Then after talking to people they talked me into just swapping the cam and just increasing the cubic inches of the engine.

Engine Specs:
4.030 bore
3.75 stroke
stock 305 cam
Edelbrock Peformer RPM air gap intake
062 vortec heads
Holley 600 CFM Vacuum secondaries carb

Would you suggest any changes, and if you do what and what would you change it to?
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Old 05-07-2011, 03:18 PM
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You have the "V6 drive". (may have been used on some 305's)

You have the wrong drive ratio for a 350 or 383 motor.

You are going to have a lot of trouble propping this boat properly for max performance

You want the 1.5:1 ratio drive.

Hyd roller cam for 383 marine vortec motor.
crane #119701 "retrofit cam" with small base circle for stroker clearance.
This is for a non roller block using retrofit style hyd roller lifters.
Cam rod clearance must be verified on a all 383's and 400's

Stock 062 vortec heads will need modification for increased valve lift

If your block is a 87+ "OEM roller cam block" w 1 piece seal this is the wrong cam.

Use cam #109831 for the roller block w OEM style roller lifters. Call Crane Cams tech first.
If you need this cam in a small base circle for stroker crank clearance call and ask.

Call Crane Cams before ordering.

cam specs are 284-292 adv 222-230 @.050" .509" in .528" ex 112LSA

Stock OEM vortec heads will need machining mods and upgrades.

www.cranecams.com

The 600VS holley may need some rejetting and upgrades for best marine power.
Its is too small for max performance from a 383.

I suggest 67 primary jets and 76 sec jets (or a #21 sec metering plate {stolen from a model 3310 carb} ) use a 6.5" power valve.
Use a purple sec vac spring. and a .028" to .031" accel shooter.
This is a base line tune up.

Get a 750-800 cfm marine approved carb for max and safe power.

Last edited by F-BIRD'88; 05-07-2011 at 03:31 PM.
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Old 05-14-2011, 11:11 PM
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I was working on the ignition system today and noticed that the coil on the boat said for use with external resistor. I don't see a resistor anywhere in the wiring for the coil. I don't even see on in my service manual wiring diagram anywhere. I am thinking that someone just replaced the coil with the wrong one and didn't even pay attention to it or know that there was a difference. The coil has to have a resistor, right? I bought a coil that says "no external resistor required" should I just install this or should I do something else?
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