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454 425hp Ignition Timing??

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Old 05-15-2012, 09:35 PM
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Default 454 425hp Ignition Timing??

Setting up a 454 ho 425 crate motor in a project. It has been completely marinized and had the cam swapped for a marine grind. Should be 425-450hp.....

Anyway, looking for a base timing set point. It has been a good while since I have done this. Soooooo......help is appreciated.

INstalled NGK bpr6fs plugs, gap at .038 does that sound right?
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Old 05-15-2012, 10:49 PM
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I'm by no mean an expert on this, but I think you're going to be told to set the timing at full advance. That's how I've set mine in the past. At full advance I'm at at 36 degrees. What cam are you running?
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Old 05-15-2012, 10:55 PM
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12-14 at idle,34 at 3500 and above more timing might give alittle more power but might cause problems if fuel goes stale
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Old 05-15-2012, 10:58 PM
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Also what ignition module are you using, that's a very important factor as the amount of advance varies from model to model.
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Old 05-16-2012, 01:46 AM
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Timing at total advance should be set to around 34*. Base timing at idle will depend on what ignition and module you are using.
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Old 05-16-2012, 03:45 PM
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Quote:
Originally Posted by endeavour32 View Post
I'm by no mean an expert on this, but I think you're going to be told to set the timing at full advance. That's how I've set mine in the past. At full advance I'm at at 36 degrees. What cam are you running?
This particular engine has a crane .553/.587 lift 214/226 duration @ .050 112 lobe sep
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Old 05-18-2012, 07:45 AM
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Quote:
Originally Posted by Baja226sport View Post
This particular engine has a crane .553/.587 lift 214/226 duration @ .050 112 lobe sep
Are you running a MSD 6AL box? I am looking for the similar answers to your question as well.

My cam however is slightly different .608/.618 lift 236/239 w/a 114 lobe.(rough #'s, misplaced my cam card for now)
I was told by others ~9 @ idle(900rpm) and ~36 @ 3000rpm. I have a MSD Pro distributor(no vacuum) and the engine builder took the springs out of it and pretty much locked it at full advance. It seems to run decent on the hose, but I'm still questioning removing the springs.

Today I'll find out, gonna give it a test run....
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Old 05-18-2012, 07:58 AM
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Stock merc ignition on this one.
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Old 05-18-2012, 08:02 AM
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34 degrees at 3000rpm
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Old 05-18-2012, 08:48 AM
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34 degrees at 3000rpm
Ok, next question....how do you do that? I guess I have to do it in the water at the dock. I am not sure about anything more than idle speed on the hose.
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