engine help

found some numbers on engine behind valve cover drivers side 10066036. what kind of engine is it sorry its on a 1991 fullsize blazer

It is a Targetmaster/Goodwrench crate 350 which could have either a 2 or 4 bolt main configuration with a 2 peice rear main seal.  It is made in mexico.

Alittle research on the internet...

quote:

Universal 350 SBC Engine ('71-'85) up to 260hp (LM1) - 5.7L 350CID 8CYL
Brand New Goodwrench 350 Engine 1971-1985 Car and light Truck Replacement Engine.
This engine remains our most popular largest selling crate engine of all times.
This is a great entry level replacement engine for older cars and trucks, and a great basic street rod engine. All of the parts in this engine are Brand New.

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350 Cubic inches 4.00" Bore, 3.47" stroke
8.0:1 compression ratio.

250 HP @4300 rpm 350 ft. lbs of torque @ 3600 rpm

( These Numbers obtained with a Quadrajet Carb,1 5/8" headers , and an Edelbrock Performer intake part # 2101)

Engine consists of the following parts:
Block -part # 10066034, casting # 10066036 2 piece rear main seal 4 bolt main

Crankshaft- part # 3932444 Nodular Iron 1985 and older flywheel bolt pattern.

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Connecting rods- Part # 10108688 Powdered Metal

Pistons- part#12514101 Cast Aluminum

Oil Pump- part # 12555284 G.M. High Volume Pump

Camshaft- Part#3863151 Hydralic Flat tappet
Intake Lift-.383" Exhaust Lift-.401"

Intake Duration @ .050"- 194° Exhaust Duration @.050"- 202°

Lobe Seperation-112°

This cam Has a mechanical Fuel Pump Lobe. This is a low end Torque oriented camshaft.

Cylinder Heads- part # 14034808 casting #33417369
1.94" Intake valve , 1.50" Exhaust Valve 76cc Combustion Chamber

7 Bolt style Exhaust Flange Standard 85' and prior intake manifold bolt pattern.

Perimeter bolt style Valve Covers. This head is very similar to the old #882 castings from the 1970's