No, in fact 350s and 327s and even the 302s use the same 4 inch bore block casting numbers. The 350 arrived in 1967 with 2.45 inch rod journal while the 327 and 302 used the earlier 2.3 inch journal. Starting in 68 and complete by 69, the 302 and 327 also got the 2.45 inch rod journal. All 3 of these engines have seen 2 and 4 bolt main caps and all three have been available in very high performance versions with an excellent reputation for durability and reliability whether using the 2.3 or 2.45 inch rod journal crank.blight said:i was told by a friend today that the cylinder walls on 327s are thinner than 350s and they blow up because of this? is this true? this is the frist i have heard of this. i am looking at building a 327 and do not want to run into this issue.
Sorry if I'm sounding confusing, I didn't mean 4 bolt 327, but rather that the common block casting for 302, 327, and 350 has been machined for 2 or 4 bolts at various times for 4 inch bore engines. But none-the-less, it's sloppy writting on my part.DoubleVision said:The cylinder wall story is just another to add to the BS hall of fame.
Before 1968, small blocks had small journal cranks and rods. The rods were not that great. As they got older and clearences got to be greater, someone would rev on it hard and it would come unglued. I`ve seen quite a few small journal engines sling rods, but I`ve seen a some medium journal rods do the same under the same conditions.
And not trying to argue with you Bogie, but I`ve never seen a 4 bolt 327.