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08-27-2004, 07:56 AM
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CC Member
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Join Date: Mar 2004
Cobra Make, Engine:
Posts: 6
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Not Ranked
Rev Limiter
I have a 392 crate motor in my LS427. It looks like they put a Ford factory ignition module in with a buil in rev lmiter. Seems like if may max out @5500 rpm. would like to bring it up to 6500. What's the MSD part number for the module that will fit
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08-27-2004, 08:15 AM
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CC Member
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Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
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Not Ranked
You probably have a 6al box. And if so, it's a small white two prong plug, (about an inch long) on the side. It will read on the top what the rev limit is, or you can remove it and have no limit at all...just be careful.
Tim
__________________
" It ain't no big deal" 
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08-27-2004, 09:18 AM
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CC Member
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Join Date: Dec 2001
Location: Olympia/Lacey,
WA
Cobra Make, Engine: West Coast. 514 / 6 speed Richmond overdrive
Posts: 1,981
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Not Ranked
If you have the stock Ford Distributor
Keep it. Many cobra owners on this site have sung the blues about engine damage caused by incompatibility of drive gear materials in mis-matched aftermarket distributors. The 6AL internals are what you need. This is the system I have along with a Blaster 2 coil. The 6AL gives you "cushioned" rev-limiting which reduces the chance of engine damage
__________________
James Madison, father of the Constitution, said, "If Tyranny and Oppression come to this land, it will be in the guise of fighting a foreign enemy." He also said, "No nation could preserve its freedom in the midst of continual warfare..."
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http://www.standdown.net/index.htm
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08-27-2004, 09:30 AM
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CC Member
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Join Date: Mar 2002
Location: so cal,
Cal
Cobra Make, Engine: I used to fix them for a living
Posts: 2,563
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Not Ranked
The (better) Ford motorspors box is a 6AL, but blue; not a Duraspark. It accepts standard MSD "pills" that you can buy anywhere in 200 rpm increments.
__________________
In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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08-27-2004, 10:44 AM
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CC Member
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Join Date: Sep 2003
Location: San Jose,
Ca
Cobra Make, Engine: SPF #1436 514
Posts: 1,488
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Not Ranked
You can go to their web site at www.msdignition.com. they have tech line products ect.
Scott
PS By the way, I had mine at 6300 rpm and still broke some valve springs. I changed it to 6000 rpm.
Last edited by scootter; 08-27-2004 at 10:47 AM..
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08-27-2004, 10:55 AM
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CC Member
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Join Date: Dec 2001
Location: Olympia/Lacey,
WA
Cobra Make, Engine: West Coast. 514 / 6 speed Richmond overdrive
Posts: 1,981
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Not Ranked
Mine's at 6000 also
Someone once asked me whyI did not have a 6200+ limiter.. did I not want to get all the horsepower out of my motor? Well since my rebuilt (514) motor maxed HP/Torque at about 5800 (on the dyno) the limiter is perfect @6000. I don't need a broken engine, I want to actually drive it now. Fancy that! 
__________________
James Madison, father of the Constitution, said, "If Tyranny and Oppression come to this land, it will be in the guise of fighting a foreign enemy." He also said, "No nation could preserve its freedom in the midst of continual warfare..."
~~~~~~~~~~~~~~~~~~~~~~~~
http://www.standdown.net/index.htm
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08-27-2004, 11:03 AM
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CC Member
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Join Date: Nov 2003
Location: Houston,
TX
Cobra Make, Engine: Superformance #1374 with 392 RDI Stroker
Posts: 502
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Not Ranked
Keep the box and install a 6,000 rpm pill. If you max out on HP/Torque at 5500, you don't need any more. I have friends that have blown engines, chevy and ford, buy installing higher than required pills in their box. Most good drivers can get a gear on the money, but you have to consider missing a gear, return spring breaking and other little gremlins that happen. This little box and pill can and will save you thousands.
Just my 2 cents
Mark
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