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Discussion Starter #1
so im going to check out some engines this weekend and i need to know how to tell the difference between 305/327/350 the casting number is 3970010 and the heads are 3973487 i know how to tell if its a 4 bolt main but i dont want to get a 305 or 327 because i plan to build a stroker he said he thinks its out of a 72 monte carlo lmk :cool:
 

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3970010 is a 69 302, 69 327, and 69-80 350, I think its safe to assume it is a 350, those heads (3973487) are 71-71 350 heads, 1.94/1.5 or 2.02/1.6 valves

casting number says 2 or 4 bolt main, just drop the pan if possible?
 

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Discussion Starter #3
so if its a 4 bolt main its ideal for a stroker build?
 

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Originally posted by bigsexy408@Sep 21 2007, 02:25 PM~8841126
so if its a 4 bolt main its ideal for a stroker build?
Actually, I've heard both. I've heard people say that 4 bolt mains are stronger, and I've heard many others say that 2 bolts are stronger, due to the location of the "extra" two bolts on a 4 bolt block...
 

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4 bolt mains are stronger, however there are kits available to use on a 2 bolts to strengthen them up. There is some machining involved in doing so. The "10" blocks were very good blocks due to the high nickel content. They were used in high performance applications; Corvettes, Z28's and Chevelles. The 2.02 heads are quite desirable as well. They use larger valves and breath better. Keep in mind that on a stroker motor the balancer is different because you will more than likely use a 400 crank.
 
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