[batman09]

I'm trying to figure out if my 1994 stock goodwrench crate motor has domed or flat pistons.Anyone have any ideas?Thanks bm

 

[GoneNova/406]

did you buy it as a crate motor?if so what is the part number and where did it cme from.give some more description.what heads does it have.the crate motor part # should do it though.

 

[Frisco]

Most Goodwrench engines come with dished pistons to keep the compression in the 8.5-1 range. (Think 87 octane gas.)

 

[batman09]

Here's the block # 10066036 target master/ goodwrench 350 crate motor.hecho en mexico
here is the number boss info...1mo830 7vp
Thats alls I have.I'm trying to buy new heads.I'm trying to decide between 180/64cc or 180/72cc.The style of piston is what I need to know.thanks bm
Some guesses are better then nothing

 

[johnsongrass1]

Crate motor or autozone special?

My guess is flat top. With 8cc reliefs.

 

[[email protected]]

Mexican, Target Master motors, have a dish piston in them.

 

[Frisco]

Here's the block # 10066036 target master/ goodwrench 350 crate motor.hecho en mexico
here is the number boss info...1mo830 7vp
Thats alls I have.I'm trying to buy new heads.I'm trying to decide between 180/64cc or 180/72cc.The style of piston is what I need to know.thanks bm
Some guesses are better then nothing

That engine came with dished pistons and 76cc chambered heads with small valves.

 

[batman09]

Frisco,Did you find that info or do you know from experience?Thanks bm

 

[Frisco]

Frisco,Did you find that info or do you know from experience?Thanks bm

I bought one of those engines and had it in the '28 Ford Pickup that is my avatar. I still have the heads (never used them) as I installed AFR heads immediately after I received the engine. I was disapointed that the engine had dished pistons as that caused the 68cc chambers in the AFR heads to result in a lower compression than AFR told me I would have. They assumed that the pistons were flat top.

Just some info.

AFR quoted me 9.5-1 with the 68 cc chambered heads. I ended up with 9.1-1 with the dished pistons. At least it would run great on 87 octane.

 

[batman09]

What kind of compression did you end up getting?Thanks bm
Ps it sounds like I should get the 72cc heads then???

 

[Frisco]

What kind of compression did you end up getting?Thanks bm
Ps it sounds like I should get the 72cc heads then???

Answered this above. I also changed the cam to a Comp 280H magnum. Not the best choice for that lower compression. Cylinder pressure was low due to valve overlap. Bottom end suffered. I compensated by using a higher stall. Truck would really scream though. 350 trans with B&M Transpak (street version) and 3.80-1 rear gears (8" Ford) and 28" tall rear tires.

 

[GoneNova/406]

i have a magnum 280 cam and have used it in my 10.5 c.r 406 and my 60 over 350 9.5 c.r. with 2.73 rear gears and a cheap tork master B&M converter and had no trouble at all.i am rebuilding the 406 now with 9.6 c.r. dished pistons with the 180 bowtie heads because of gas price's.i just ported the heads and now have a 2800-3200 coan converter and expect to do well.this is in a 3/4 ton full size van with posi.don't be afraid to go with the dish or the 64 cc.especially if you have a cam in the 220-230 dur. at .050". range.

check your block # again and see if the last # isn't an 8 instead of a 6.my GM parts book says the 10036033 mexican block was made in the 70's,10066036 mexican was made in the 80's and the 10066038 was 92 and up.these are goodwrench engines.

 

[batman09]

gonenova,
I'm almost positive the number is 10066036.Is there anyway to find out more info on this motor.I'm pretty sure nothing was ever done to it.I'm looking for compression, cam,head and piston specs.Where would I find this info?Does your book have any of this info?Thanks bm

I think this is my motor

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.


--------------------------------------------------------------------------------


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.


--------------------------------------------------------------------------------


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

 

[GoneNova/406]

i have something to do right now but if no one else comes up with it i'll check back a little later see what i can find.

 

[GMC boogie]

Go with the 64cc heads. It has cast dish pistons that are a pitiful .045 below the deck at tdc.

 

[killerformula]

definately get 64cc heads. Even then you're only going to be in the low 9's

 

[batman09]

killer,
Can you tell me why? thanks bm

 

[GoneNova/406]

i was able to verify bits and piece's of your info including the engine code and your piston is a dish : 8.5/76cc,,,9.1/64cc.go with the 64cc.

 

[batman09]

Thanks nova!!
Killerformula?

 

[GoneNova/406]

i was able to verify some of you info including your engine code and you do have dished pistons that list as 76cc/8.5 c.r.,,,,64cc/9.1 c.r.,,,so go with the 64cc heads.