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Old 02-09-2007, 09:59 AM   #1
70LongbedC20
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Goodwrench Targetmaster specs Anyone know them?

ID on Pad: 10066036

I know this is a "Hecho in Mexico" 350, 2 or 4 bolt mains, etc. I also know they often came with crap 76cc chamber heads. But can someone tell me what the compression, power output and camspecs on one are? I have more heads, wanted to know if I could just swap to a smaller chamber/bigger valve head, or if a cam change is also in order. Runs smooth. Just need the truck to tow my Chevelle, but as usual I can't resist trying to make it faster all while trying to retain decent gas mileage.

I've heard some people say that these block are crap, but many others have used them for years without problems. Just wondering if anyone bought one of these high powered puppies and has the specs.

Thanks
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Old 11-13-2010, 12:09 PM   #2
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Re: Goodwrench Targetmaster specs Anyone know them?

Are these engines better than the stock 73-85 V8's?
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Old 11-13-2010, 12:23 PM   #3
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Re: Goodwrench Targetmaster specs Anyone know them?

I got one from the junkyard for 600 bucks (complete) and put it in my '67 - I added an intake and carb combo from Summit and it runs great, pulls nicely, and doesn't smoke at all. I will end up pulling it and putting in ZZ4, but for now, I'm quite happy with it - I can't help you with the specs, though.
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Old 11-13-2010, 10:04 PM   #4
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Re: Goodwrench Targetmaster specs Anyone know them?

I am going to try to do this from memory. The compressoin ratio is 8.5:1. The horsepower is 230ish? You could put in a cam around 260 -268 with 45-475 lift and a set of vortec heads and HANG on ! that will pump that mtoor right up ,and you'll be grinning aal the time. The vortec heads are better floeing than any thing else the general has put on a smallblock. You can expect a gain of 30-50 hp by going to that stlye of head. You will need a vortec intake but you probably needed to update the intakeand carb on the motor anyway. Jim
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Old 11-14-2010, 01:43 AM   #5
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Re: Goodwrench Targetmaster specs Anyone know them?

From wikipedia;

Goodwrench The GM Goodwrench 350 crate engine
comes in several variations. The cheapest
version produces 195 net horsepower
(with accessories), and 260 gross
horsepower (without the alternator, power
steering, A/C compressor, catalytic converter, factory exhaust manifold, and
muffler) when used with a four barrel
carburetor, dual exhaust, and headers.
The low output is the result of the
relatively low 8.5:1 compression ratio,
restrictive cylinder heads, dished pistons, and stock camshaft profile.[citation needed] All of the GM Goodwrench engines use the
pre-1986 four-bolt casting molds with two
dipstick locations; pre-1980 on the driver's
side and post-1980 on the passenger's
side. This engine was produced in Mexico
since 1981 as the Targetmaster 350, and now the GM Goodwrench 350.
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Old 11-14-2010, 11:41 AM   #6
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Re: Goodwrench Targetmaster specs Anyone know them?

I had a Target master in my truck and we put 140,000 miles on it without issue. We got a little excited with it and caused some damage, so when we replaced it with another block from GM going into it's place. Both engines received an upgrade in the cam and intake, along with headers. The second engine is still running in my son's truck and doing just great.
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Old 11-14-2010, 01:51 PM   #7
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Re: Goodwrench Targetmaster specs Anyone know them?

Ive put hundreds of them in light duty fleet trucks. You put the engine in tune in up a bit & send it out the door & never have to mess with it again. They are better quality then the original equip. engine in the car's & 1/2 tons. I would put it in with a good 4 barrel, HEI, & dual exhaust & it will probably do everything you want.
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Old 11-14-2010, 10:02 PM   #8
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Re: Goodwrench Targetmaster specs Anyone know them?

Is it true that they all are 4- Bolt Mains?
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Old 11-15-2010, 07:29 PM   #9
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Re: Goodwrench Targetmaster specs Anyone know them?

All the ones for 86 on back are 4 bolt mains.
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Old 11-24-2010, 11:10 PM   #10
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Re: Goodwrench Targetmaster specs Anyone know them?

Here's the casting number on my 350 GoodWrench that I just pulled today:
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Old 11-24-2010, 11:13 PM   #11
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Re: Goodwrench Targetmaster specs Anyone know them?

Found this googling 10066036:


10066036...350...........4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico"

10066038...350.....94....4...Goodwrenc… crate motor, 2-piece rear seal, "Hecho en Mexico"

Both are the same engine. It's the std goodwrench 350.

249 HP @ 5,000 RPM
304 Ft/Lbs @ 3,500 RPM


Here's the info I have on it.

10067353 Brand New Goodwrench 350 Engine 1971-1985 Car and light Truck Replacement Engine.

Engine consists of the following parts:

Block -part # 10066034, casting # 10066036
2 piece rear main seal 4 bolt main

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

Powdered Metal Connecting rods- # 10108688

Cast Aluminum Pistons-#12514101

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

Hydralic Flat tappet Camshaft- #14088839
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


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.
350 Cubic inches 4.00" Bore, 3.47" stroke
8.5:1 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 Name: 350 LM1
Horsepower: 249 HP @ 5,000 RPM
Torque: 304 Ft/Lbs @ 3,500 RPM
Compression Ratio: 8.50 to 1
Block: 4 – Bolt, 2 Piece Rear Seal, 4.000” Bore
Crankshaft: Cast Nodular 3.480” Stroke
Heads: Cast Iron, 76cc
Valves: 1.940” / 1.500”
Camshaft lift: 0.390” / 0.410” Hydraulic
Duration @ 0.050”: 195 / 202
Intake: Not Included

This engine can also be used in 1986 model pick-ups. The flexplate (flywheel) must also be changed. Use flexplate #471598.

SDPC Part Number: 10067353 Manufacturer: GM Goodwrench Replacement Engines New/Reman. : New Core Value : 100.00 Transmission : A/S Cubic inches : 350 Liters : 5.7L

This engine includes Painted Valve Covers, oil pan and Timing Cover. This engine is drilled for both L.H. and R.H. dipsticks. Plugs Are included to plug the side not used.Two timing pointers are also included, a pointer for a 6" balancer and a pointer for an 8' balancer.Balancer with 2:00 timing mark must be used with this engine in order for mark to line up with the pointer.
For most stock applications with HEI ignition, Base ignition timing should be set to 10 before top dead center (with vacuum advance disconected) Total ignition timing should be around 36 @ 3000 rpm.

Spark plugs that should be used are AC Delco R45TS gapped at .045"

Oil filters used with this engine include PF25 , PF35 , PF1218 , or PF35L. The first oil filter is a 1/2 Quart type, the last three are the 1 quart type.
Generally 10W30 or 10W40 oil is used in this engine.

Does Not Include Balancer , flywheel , intake , Exhaust , Ignition , or fuel parts.
See Links Below for addl' install parts.

head gaskets used .026" to .028" x 4.100"

This cam is used in the "Universal 350" GM crate engine, and was originally used in 1980's GM truck engines.

- 8.3435 cc flat top cast pistons
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Old 12-01-2010, 03:44 AM   #12
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Re: Goodwrench Targetmaster specs Anyone know them?

Funny thing about the Goodwrench oilpan; you need a gasket that has the pop-outs for the dipstick on both sides. I told the guy at O'Riely's Auto Parts, that I needed a gasket for a GM Goodwrench 350, and he said it didn't matter. So much for him knowing what he is talking about...
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Old 12-01-2010, 04:10 PM   #13
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Re: Goodwrench Targetmaster specs Anyone know them?

Quote:
Originally Posted by LostMy65 View Post
Here's the casting number on my 350 GoodWrench that I just pulled today:
Dropped the Oil Pan yesterday.
Yep, it's a 4-Bolt Main.
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Old 08-21-2012, 08:44 PM   #14
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Re: Goodwrench Targetmaster specs Anyone know them?

i have what i think is a targetmaster now the thing is its blue the casting # is 3970010 now everthing says 69-70 350. but then the stamping # on the front of the motor is MJ03800 i hope someone can help figure this one out.
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Old 08-21-2012, 10:55 PM   #15
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Re: Goodwrench Targetmaster specs Anyone know them?

I dont know any thing about the numbers but the early Targetmasters were blue.
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Old 08-22-2012, 07:28 AM   #16
1955 mancave
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Re: Goodwrench Targetmaster specs Anyone know them?

yeah i remember when they were blue, but its the casting and stamping #'s that are unclear.
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Old 01-15-2013, 12:28 PM   #17
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Re: Goodwrench Targetmaster specs Anyone know them?

MJ02800 = October 02, 1979 Targetmaster

Last edited by zz1958; 01-15-2013 at 12:29 PM. Reason: I'madumass
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Old 12-20-2017, 10:01 PM   #18
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Re: Goodwrench Targetmaster specs Anyone know them?

Quote:
Originally Posted by LostMy65 View Post
Found this googling 10066036:


10066036...350...........4...Goodwrench crate motor, 2-piece rear seal, "Hecho en Mexico"

10066038...350.....94....4...Goodwrenc… crate motor, 2-piece rear seal, "Hecho en Mexico"

Both are the same engine. It's the std goodwrench 350.

249 HP @ 5,000 RPM
304 Ft/Lbs @ 3,500 RPM


Here's the info I have on it.

10067353 Brand New Goodwrench 350 Engine 1971-1985 Car and light Truck Replacement Engine.

Engine consists of the following parts:

Block -part # 10066034, casting # 10066036
2 piece rear main seal 4 bolt main

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

Powdered Metal Connecting rods- # 10108688

Cast Aluminum Pistons-#12514101

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

Hydralic Flat tappet Camshaft- #14088839
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


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.
350 Cubic inches 4.00" Bore, 3.47" stroke
8.5:1 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 Name: 350 LM1
Horsepower: 249 HP @ 5,000 RPM
Torque: 304 Ft/Lbs @ 3,500 RPM
Compression Ratio: 8.50 to 1
Block: 4 – Bolt, 2 Piece Rear Seal, 4.000” Bore
Crankshaft: Cast Nodular 3.480” Stroke
Heads: Cast Iron, 76cc
Valves: 1.940” / 1.500”
Camshaft lift: 0.390” / 0.410” Hydraulic
Duration @ 0.050”: 195 / 202
Intake: Not Included

This engine can also be used in 1986 model pick-ups. The flexplate (flywheel) must also be changed. Use flexplate #471598.

SDPC Part Number: 10067353 Manufacturer: GM Goodwrench Replacement Engines New/Reman. : New Core Value : 100.00 Transmission : A/S Cubic inches : 350 Liters : 5.7L

This engine includes Painted Valve Covers, oil pan and Timing Cover. This engine is drilled for both L.H. and R.H. dipsticks. Plugs Are included to plug the side not used.Two timing pointers are also included, a pointer for a 6" balancer and a pointer for an 8' balancer.Balancer with 2:00 timing mark must be used with this engine in order for mark to line up with the pointer.
For most stock applications with HEI ignition, Base ignition timing should be set to 10 before top dead center (with vacuum advance disconected) Total ignition timing should be around 36 @ 3000 rpm.

Spark plugs that should be used are AC Delco R45TS gapped at .045"

Oil filters used with this engine include PF25 , PF35 , PF1218 , or PF35L. The first oil filter is a 1/2 Quart type, the last three are the 1 quart type.
Generally 10W30 or 10W40 oil is used in this engine.

Does Not Include Balancer , flywheel , intake , Exhaust , Ignition , or fuel parts.
See Links Below for addl' install parts.

head gaskets used .026" to .028" x 4.100"

This cam is used in the "Universal 350" GM crate engine, and was originally used in 1980's GM truck engines.

- 8.3435 cc flat top cast pistons
Can anyone help me out with mine casting is 10066036 and the passenger front pad is 1m1113 6vp?? Please trying to get it in perfect time
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Old 12-21-2017, 06:18 AM   #19
DiKeLbErRy
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Re: Goodwrench Targetmaster specs Anyone know them?

Can anyone help me out with mine casting is 10066036 and the passenger front pad is 1m1113 6vp?? Please trying to get it in perfect time
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