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Discussion Starter #1
I have a little problem, I need to know if there is any way to identify if I have a 327 or a 350 block. The casting number is 3970010. I guess this could be a 350 or a 327. I understand that you can tell the difference by measuring the stroke. 3.25 for 327 and 3.48 for 350. My question I guess is can I figure out the stroke without pulling heads back off? My second question is can I use a 350 balancer on a 327 or is this a seriours no no?

I found it odd that my balancer off my original 350 is on 6.75 inches diameter and thats when all the confusion started.
 

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If you can remove your oil pan you should be able to find the part# cast on the crank, If it's a GM crank. I have a casting# book if you find the#. According to my book that block was used for 302's and 350's but someone could have put in a 327 or 307 crank or it could be stroked to a 383 or maybe something else.
 

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Engine code from the front pass deck pad? You can use a 350 h/bal on a 327, but you can't use a 327 h/bal on a 350, not enough weight.

The thickness of the h/bal is determined by the stroke. More stroke, thicker rim on the h/bal. The factor is the amount weight of counterweights on the crankshafts. 283 & 307 have the same h/bal, thin, 3/4 inch width? 327 has 1 inch width? 350 has 1 1/16 inch wide.
 

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Discussion Starter #4
Just some more info. The block when it was apart from what I can remember for sure had a 4 bolt mains. Just measured damper 6.75" by 1 and 3/16th. I just found this info on another website can anyone confirm that this is accurate.

Years Casting CID Main Caps Comments [SIZE=-1]
[/SIZE]
1968 3970010 327 - - 2 A
1969-79 3970010 350 185 370 2 or 4 car, truck, Vette

I am sure this is stupid question can you convert a 327 from a 2 to a 4 bolt main? I thought I had a 327, it is looking more like 350???

I am asking these questions because I really do not want pull anything apart again!!!!!

The damper is most certainly off 350 which sounds like it will work on 327 if that is what it is??
 

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Yes, you can change from 327 to 350. Change crankshaft and pistons.
Yes, it can convert a 2-bolt to 4-bolt. As long as the webs are thick enough.

GM 4-bolt would be four parallel bolts per cap. Most aftermarket 4-bolt kits have the outer two bolts at an angle and maybe steel main bearing caps. If original GM 4-bolt, you could have a forged crankshaft as identified by a wide mold split line on the side of the rod journals, I think.

If you don't want to pull the pan, you can view through the oil drain plug.
 
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