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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: acountryclipper on June 03, 2008, 07:39:09 pm

Title: Decoded VIN
Post by: acountryclipper on June 03, 2008, 07:39:09 pm

I just decoded the VIN on my 86 chevy 3/4 ton and the engine code says it has a 350 heavy duty. does the heavy duty mean that it has a 4 bolt main or what?

Title: Re: Decoded VIN
Post by: Captkaos on June 03, 2008, 11:34:18 pm

It means it is the low emmissions model.  It "might" have 4bolt, might not...

Title: Re: Decoded VIN
Post by: Fast68Chevy on June 22, 2008, 01:49:35 pm

heavy duty emissions

normally is vin engine digit code M

bolt mains will be random

these usually had the TCC system with a relay mounted on the pass side valve cover, and virtually no other emissions equipment and no cat converters either, and commonly were equipped with factory dual pipes, 1 ton and some 3/4 ton pickups and vans both if are over the required GVWR


good luck :D