Thread: GM Engine?

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3/8 NC. Measure the length of your bosses where the bolts go through and add 1/2"-5/8" for threading into the block. If you can't find the right length, buy the next longer bolt and shim it under the head with flat washers.

Thanks techinspector!! Uve been very helpful today!
I guess the first thing I'm going to have to do is lower the comp ratio to use this thing on premium pump gas then, I need to buy those books. Someone recommended ditching the timing set with the 30 year old nylon gear and switch to double roller, guess that wouldn't be a bad first purchase huh?

Originally Posted by iMechanic

Thanks techinspector!! Uve been very helpful today!
I guess the first thing I'm going to have to do is lower the comp ratio to use this thing on premium pump gas then, I need to buy those books. Someone recommended ditching the timing set with the 30 year old nylon gear and switch to double roller, guess that wouldn't be a bad first purchase huh?

And when you buy the timing set make sure it's a pre 72 set.

Edelbrock makes a 70cc chamber aluminum head. I don't know what that would drop the compression down to but you can run a little more compression with aluminum heads. I'd try to keep those TRW pistons. You can also get 76cc Chevy heads that would drop compression even more. Look for casting # 3973487, 3973493, 3998993 and 3998997. These are intermediate to high performance heads.

Ok I will check it out. Do you think a lot of what I need will float by on the parts for sale section of this forum or should I eBay it or shop retail? I'd rather know the parts I'm getting are legit, but still kinda on a budget, for now at least....

Originally Posted by iMechanic

Thanks techinspector!! Uve been very helpful today!
I guess the first thing I'm going to have to do is lower the comp ratio to use this thing on premium pump gas then, I need to buy those books. Someone recommended ditching the timing set with the 30 year old nylon gear and switch to double roller, guess that wouldn't be a bad first purchase huh?

Don't do anything or buy anything until you have an iron-clad, written-in-ink plan of what you're going to do with the motor and the car.

When you get to the point of buying parts, I would recommend this timing set....
http://www.summitracing.com/parts/CLO-9-3100/

I have a suspicion that to use what you have (all forged parts) to advantage, you'll end up with a high-rpm Saturday Night Special and you'll want a good timing set.

I'll even go out on a limb here and suggest the heads that ought to be on that short block....Brodix KC-IK-210....

Again, buy nothing yet, I'm just bench racing and these are just my opinions. Others may have better ideas.....