G.M.C 350 heavy duty?

heavy duty

Frequently Asked Question:

G.M.C 350 heavy duty?

I have a 1984 G.M.C sierra 2500. It has the 5.7l v8 in it but the engine vin number has it labeled as the 350 “heavy duty”. What’s different about this engine then a standard 5.7l v8 and how much hp and torque should it be putting out?
Mike its identified as an lt9 engine thank you.

Answer by Mike S
My manual is showing only 1 350 (5.7) Available in 1984 9.1 compression, and 205hp @4300 rpm

It shows 2 305′s (5.0) 8.6 compression 150hp @ 3800rpm
9.5 compression 190hp@ 4800rpm

Hit me back with the stamped engine Id number located by the distributor on the drivers side, and I’ll happily give you the info I have on it.

LT9350/V 8160 HP260 torque K20,K30 81-86

4″ bore 3.48″ stroke (standard for all 350′s) 4Bolt Main (highly sought after, and great building blocks

Cast Crank
8.3:1 compression
76cc cylinder heads, (prone to cracking if over heated, or if an EGR Valve malfunctions.
800CFM Quadrajet Carb

These engines are weighed down with inefficient emissions control systems, and the power output was rated with all accesories running at full load to reduce insurance rates.

These engines in stock form, are known for carbon build up on the pistons and valves if driven lightly,

Internal parts are interchangable from other 350′s, It is recommended to upgrade the heads to a 64cc design raising the compression ratio to an almost perfect 9.0:1 which raises HP by aproximately 30-40 extra ponies.

These engines require that all emissions systems be serviced regularly. (Or partially removed)
Any problem with the emissions can severely reduce power output.

This is the info I have on that particular engine. But keep in mind that 350′s are all the same from 1969-1986. So you get a wide range of possible parts selection.

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2 Responses to G.M.C 350 heavy duty?

  1. Dennis says:
    September 20, 2011 at 9:12 am

    G M sold a lot of “long block” (new) replacement engines. They were called “Target Master”. The black ones were 350 HD and had 4 bolt main caps and were meant for trucks. The blue ones were 2 bolt meant for cars.

  2. done wrenching says:
    September 20, 2011 at 10:09 am

    There were some medium or heavy duties also, that had 7/16″ holes on end of cylinder heads for accessory mounting instead of the normal 3/8″.

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