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 Post subject: Starting point tune
PostPosted: Mon Mar 10, 2014 8:36 pm 
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Joined: Sun Dec 26, 2010 11:42 am
Posts: 564
Location: Florida
My 72' is pretty close to being ready to run, and be roadworthy. I am going to start with somewhere around 14-18 degrees base timing. (Vacuum advance disabled) I have a Moroso spring and weight kit installed with the heavy springs. (around 36-38 degrees total advance) Plugs are indexed, stock heat range - 44 I think?, .035" gap IIRC. Petronix Ignitor III with matching coil.

My SCR is 9.65:1 (measured) vs. the factory advertised 8.5:1. The DCR is 8.57:1
(For reference, I have a spare, untouched short block. I took some measurments and come up with 8.4:1 SCR and 7.365:1 DCR)

I am guessing around 3900-4000 lbs with driver and fuel. 3.73 gears, M21 close ratio trans.

Am I in the ball park with my timing and plug gap?

_________________
1972 Chevelle SS 454 4 speed
1969 Malibu 2dr hardtop L48/4 speed -> 427 L72
1968 Malibu 2dr hardtop restomod
1972 Monte Carlo

Yes, I have an addiction.


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 Post subject: Re: Starting point tune
PostPosted: Mon Mar 10, 2014 8:59 pm 
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Joined: Fri Jul 25, 2008 6:12 pm
Posts: 2617
Location: North Salem NY
Seems in line, should start!

Im curious what your cranking compression is?

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69 Nova SS 396 L89
10.481
1.61 60’
132.34 mph


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 Post subject: Re: Starting point tune
PostPosted: Tue Mar 11, 2014 4:26 pm 
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Joined: Sun Dec 26, 2010 11:42 am
Posts: 564
Location: Florida
Ted Daros wrote:
Im curious what your cranking compression is?


I'll have to stick a guage on it and see. I generally like to check all 8 cylinders with zero miles, then again after 800-1000 miles. All the calculators I have checked online say around 188 psi +/- 1-2 psi.

_________________
1972 Chevelle SS 454 4 speed
1969 Malibu 2dr hardtop L48/4 speed -> 427 L72
1968 Malibu 2dr hardtop restomod
1972 Monte Carlo

Yes, I have an addiction.


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