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Old 02-24-2013, 10:22 AM
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98 GMT CPS-replace with MSD?

I have a 98 K3500 w 5.7 vortec I'm converting to a 402 BBC power. I'd like to keep as much of the PCM as possible due to limited budget so....
Can I use the MSD flying magnet crank trigger on the BBC in place of the stock GM cps?

Thoughts anyone?

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Old 02-25-2013, 09:40 AM
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You will need to use the front timing cover from a 1996-2000 L29 454, and install the 4x reluctor wheel from an l29 onto the crank of your 402.
That will supply the PCM with its 4x crank sighnal.

Then you will need to use your L29's Vortec distributer as well. This supplys the PCM with a 1x camshafty positions ensor signal as well as distributing high tension voltage to the plugs.

You will need a PCM tune to go from a 454 down to a 402, or from a Vortec 350 L31 up to a 402.

Dont worry, teh Vortec 4.3/305/350 and 454 all use teh saem PCM , just differnt calibrations "flashed" into them.

BBC L29 454 crank position sensor-p/n's-12562910, 12596851, 213946
delco number 2133208 $52.89

Front timing cover $52 12561062

Crank position 4x relcutor wheel 12561024 $6.87

Because the reluctor wheel takes up some space, you will need a Vortec L29 454 damper which is narrower, or machine down the existing damper.

peace
Hog
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Old 02-25-2013, 10:38 AM
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Quote:
Originally Posted by Hogg View Post
You will need to use the front timing cover from a 1996-2000 L29 454, and install the 4x reluctor wheel from an l29 onto the crank of your 402.
That will supply the PCM with its 4x crank sighnal.

Then you will need to use your L29's Vortec distributer as well. This supplys the PCM with a 1x camshafty positions ensor signal as well as distributing high tension voltage to the plugs.

You will need a PCM tune to go from a 454 down to a 402, or from a Vortec 350 L31 up to a 402.

Dont worry, teh Vortec 4.3/305/350 and 454 all use teh saem PCM , just differnt calibrations "flashed" into them.

BBC L29 454 crank position sensor-p/n's-12562910, 12596851, 213946
delco number 2133208 $52.89

Front timing cover $52 12561062

Crank position 4x relcutor wheel 12561024 $6.87

Because the reluctor wheel takes up some space, you will need a Vortec L29 454 damper which is narrower, or machine down the existing damper.

peace
Hog
Can I use the L31 vortec's crank sensor and distributor as I have these allready and both work perfect?
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Old 02-25-2013, 11:20 AM
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Quote:
Originally Posted by rickpilgrim View Post
Can I use the L31 vortec's crank sensor and distributor as I have these allready and both work perfect?
Off the top of my head I thought the distributers were intercharngeable between the L31 and L29, but their part numbers are different.
the Accel Billetech fits teh BBC and the SBC Voirtec engines.
ACCEL BilleTech Late Model Distributors 60116 - SummitRacing.com
I'm going to say that the BBC and SBC distributers will interchange.

And yes, I just cross referened the L31 and L29 and the crank position sensor are the same part number.

peace
Hog
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