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01-27-2009, 08:21 PM
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#1 |
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Registered User
Join Date: Apr 2008
Location: IL
Posts: 160
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M code 350
My '86 came stock with the "m" code 350. I've also heard it referred to as the "heavy duty" 350. What's different? I've heard heavier crank and that they run hotter. Is this true?
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1986 Chevy 3/4 Ton 4X4 
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01-27-2009, 10:08 PM
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#2 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: M code 350
The 350"M" is a 4 bolt main HD eng. the crank is the same dimentions as a regular 350 but of a different material. They don't run any hotter or cooler than any other 350. The radiators were generally larger because the engines were put in trucks that were ordered for heavier work, especially if AC equiped. I have one in mine. With the exception of doing a valve job at 200,000 miles I have done no major work to it. If ya keep them tuned and the oil changed they will run forever. Mine is at 465,000 now and it runs great. jim
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot  Jim or Paladin whichever you choose.
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01-28-2009, 01:58 AM
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#3 |
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Registered User
 
Join Date: Jun 2007
Location: Springfield Mo.
Posts: 1,086
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Re: M code 350
Interesting....are the cranks in these 350s forged steel? ...Joe
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I'm not speedin'! I'm qualifyin'! |
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01-28-2009, 11:20 AM
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#4 |
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One shot, one kill.
Join Date: Dec 2007
Location: Saratoga Springs NY
Posts: 859
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Re: M code 350
Good question Joe. I was Chevy Mechanic for 33 years and I really don't know, never needed to. If you open yours up, take a look for a pink paint splash on the crank. If it has it it's a good chance it's forged steel.
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1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shot Jim or Paladin whichever you choose.
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