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Author Topic:   350 Goodwrench block question.
posted January 14, 2004 09:29 AM
I just bought a complete engine out of a one ton chevy truck and the engines valve covers claimed the engine to be a GM Goodwrench 350 engine.Engine part number is 10066036

I tore the engine down and it is a 4 inch std bore with flat top dished 4 valve relief cast pistons 4 bolt main.

The engine is in excellent shape as the crank with chamfered oil holes on the rod journals.

Before I use the engine was wondering would it be a good engine to build for a street stock with after market crank-pistons ect?

Any advice will be appreciated.

Thank you.

[This message has been edited by stevenwm (edited January 14, 2004).]

rico 08
posted January 14, 2004 07:15 PM
Alot of those are "HENCO IN MEXICO" i've only heard and seen bad things 'bout 'em like core shift,cracks etc so be careful.

posted January 14, 2004 07:31 PM
Thanks Rico 08.

Before I use it I will get it checked out and if no cracks I will use block filler in the water jackets before doing any machine work.I will then have it decked to square the deck surfaces with the crank center line and have it bored 30 over and hone it for piston to cylinder wall clearances.

If I have to I will buy a race block from dart unless someone sells race prepped oem sbc blocks?

I am going to then get a billet steel crank and alter the stroke and use long rods and forged domed top pistons and set the engine up with proper bearing-rod clearances ect.

Our class has changed the rules from 358 C.I. to 366 C.I.

I will be running Dart heads and a Alcohol holley double pumper with a Lunati solid lifter camshaft and other things.

Thanks again.

posted January 14, 2004 09:23 PM
I had one given to me with low miles on it. All I did was change to a high pressure oil pump spring and put my cam and valve springs in it and it has held up well to 6300 rpm and is still going. I think they are OK for a limited engine class, but with as much work as you are planning on I've heard the iron in some of the older blocks is better.

rico 08
posted January 15, 2004 09:21 AM
366 cube limit?That's a strange one,maybe someone built a high dollar engine and bought a rule change.Good luck on it....

posted January 15, 2004 01:43 PM
I dont think I will be building the henco in mexico gm goodwrench block.I was told by a professional engine builder they were not good racing blocks.Thanks for the info.

Take care.

posted January 15, 2004 04:28 PM
I would take into consideration what class you are building for also. If it is a hobbystock class, then I would say you'd prob be safe with the late model block but I dont think I would trust it in a modified. They are lighter castings so they are not as good as the older blocks but in the right situation I think they are usable. The cylinder walls are thinner so I wouldnt go much more than .030 over on the bore and check them over good for core shift etc.

You might want to check into GM bowtie or Sportsman blocks. I think they are a better casting than the production blocks and they are little cheaper than Dart. You can also buy a brand new stock 350 block for about 500$ but its not the heavy duty version.

[This message has been edited by dirtbuster (edited January 15, 2004).]

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