350 crate motor M or L ? - Team Camaro Tech
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post #1 of 3 (permalink) Old Mar 26th, 01, 07:19 AM Thread Starter
Join Date: Mar 2001
Posts: 1

Hello,the four dealers I talked to around here dont have a clue about this subject so I'm hoping someone here can help me.I have an 86 Chevy 1 ton dump truck and I want to buy a new GM motor for it.My VIN # designates I have a M motor instead of the L.The dealers cant tell me the difference only that mine is $700 more.They both are 4 bolt,same crank,carburated.One dealer said the heads are different.Should I pop for the $2K motor or go with the cheapie? Thanks.PS,I know this is not performance related but dont know where else to go.
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post #2 of 3 (permalink) Old Mar 26th, 01, 08:41 AM
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,291

I think there are a few differences in the two. Most of the heavy duty motors have a steel crank. They also have the stellite exhaust valves with larger stems. I cannot think of any other differences, but I also know that if you do not replace the motor with the correct one by the serial number, there will be no warranty. Dont let them tell you otherwise.
I think I would go with the correct motor in that type of truck.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73
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post #3 of 3 (permalink) Old Mar 26th, 01, 02:25 PM
Join Date: Jul 2000
Posts: 233

Maybe the "M" is for more and the "L" is for less?

69 Camaro 454
71 Nova 454

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