At what point msd over gm hei... - Chevy Nova Forum
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Old 27th-November-2012, 03:56 PM   #1
67ss
 
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At what point msd over gm hei...

Putting a 355 with approximately 425 hp into our drag only foot brake bracket car. Will have to change out the converter and gears to compliment it as well. We have a stock gm hei that we ran last year without problem on a mild 350. My question is do you guys think it would be worth it to change over to this msd kit at this point? Also, any of you done the swap and what were the results?

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Old 27th-November-2012, 04:13 PM   #2
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Its nice to have a top end rev limiter.

My car is a street/strip car I have a MSD pro billet distributor, Blaster 2 coil and 6AL box.

I noticed minimal difference from switching over from a HEI with the ACCELL Coil on top
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Old 27th-November-2012, 04:41 PM   #3
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Originally Posted by Gregs72 View Post
I have a MSD pro billet distributor, Blaster 2 coil and 6AL box.
I have this exact setup on my street car with a mild 350. It has worked perfectly for the 10-15 years that it's been on the car, no complaints at all.
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Old 27th-November-2012, 05:24 PM   #4
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if it's a stock hei, the difference is night and day. I picked up almost 800 usable rpm with change from hei to MSD 6 and billet dist. this was on a 300 horse Summit ES motor. Car used to nose over at around 4800 - 4900. After change would pull hard to 5500 5600 and rev all the way to 6000. With your new motor I would definitly change to a msd setup or at least use a blueprinted HEI and change the coil to an aftermarket.
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Old 27th-November-2012, 05:32 PM   #5
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Well if thats typical then its a no brainer, 5600 plus is probably right in the wheel house for this 355.
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Old 28th-November-2012, 08:37 AM   #6
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A 6AL is a good box to use, especially if you are looking to use a rev limiter. It gives you the ability to use a 2 step rev limiter for starting line or burnout rev control. My Chevelle went 9.15 with one.
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Old 28th-November-2012, 09:58 AM   #7
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If you do go 6al make sure its a newer digital one. 2 step's and RPM activated switches are a lot cheaper. Analog's are being phased out so if you see them for lower price that's the reason.
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Old 28th-November-2012, 10:09 AM   #8
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My car is a street/strip car I have a MSD pro billet distributor, Blaster 2 coil and 6AL box.
I have the same setup as well, love it.
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