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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 77GMCSerria on December 14, 2006, 02:16:00 pm

Title: 350 Heavy Duty?
Post by: 77GMCSerria on December 14, 2006, 02:16:00 pm

What exactly makes a 350 a heay duty 350? Is it a 4 bolt main or special heads or intake?

The motor was in a 81 K30 Crew Cab Dually with a auto tranny.

Thanks

Title: Re: 350 Heavy Duty?
Post by: roundedline on December 14, 2006, 03:12:00 pm

Typically 1 tons had 4 bolts, but I have see several that didn't, so don't count on it.  The 20/30 series trucks had valvtrains designed for low rpm to make pulling power and typically small valves.  For 1981 they had .1 extra compression (8.2 vs 8.3)

The block in itself is nothing special though.

Chris Lucas
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