327

[junkyardjohn]

Anyone know the difference between the 327 up to 1967 and the 1968 327?

 

[Hib Halverson]

One big difference is the 68 was the only 327 with a large-journal crankshaft such as what the 350 used.

 

[junkyardjohn]

327 block

One big difference is the 68 was the only 327 with a large-journal crankshaft such as what the 350 used.

If I remembered correctly some if not all block were casted for 4 bolt mains?

 

[Tom73]

If I remembered correctly some if not all blocks, were drilled for 4 bolt mains?

Believe that the 4 bolt mains did not come along until the 350 of '69.

 

[o2bnkc]

1968 was the first year for the L79.

 

[Hib Halverson]

If I remembered correctly some if not all blocks, were drilled for 4 bolt mains?

No 327 had a block with four-bolt main bearing caps. The 302 the first to get four-bolt mains during the 68 model year. The '70 LT1 was the first 350 to have four-bolt mains.

 

[BigJimZ16]

1968 was the first year for the L79.

Not true... sorry, my 1966 Nova SS had an L79 327 350hp from the factory.

 

[junkyardjohn]

327 block casting #s?

Strange casting # 3955618. Any idea for what engine or engines?

 

[junkyardjohn]

Sorry , I meant casted not drilled.

No 327 had a block with four-bolt main bearing caps. The 302 the first to get four-bolt mains during the 68 model year. The '70 LT1 was the first 350 to have four-bolt mains.

Sorry I meant casted to accept 4 bolt main caps.

 

[JohnZ]

Strange casting # 3955618. Any idea for what engine or engines?

Not strange at all - that block was used for 302's and lots of 350's.

 

[JohnZ]

1968 was the first year for the L79.

Nope. It was in the Corvette starting in 1965.

 

[JohnZ]

If I remembered correctly some if not all block were casted for 4 bolt mains?

Nope. GM never produced a 327 with 4-bolt mains.

 

[bb2kksy]

according to nastyz28.com/sbchevy, block casting 3955618 is a 68 -69 327 with 4 caps. no hp given

 

[Hib Halverson]

according to nastyz28.com/sbchevy, block casting 3955618 is a 68 -69 327 with 4 caps. no hp given

"nasty28.com" is wrong.

There were no production 327s built by GM with four-bolt main baering caps. All production 327s used 2-bolt mains.

Sure, it may be possible to modify those blocks with four-bolt caps on the center three mains, but none came from the factory that way.

 

[pws69]

No 327 had a block with four-bolt main bearing caps. The 302 the first to get four-bolt mains during the 68 model year. The '70 LT1 was the first 350 to have four-bolt mains.

How about the 69 L46.....

 

[o2bnkc]

Well, this one opened a can of worms.

 

[JohnZ]

The 386, 618, and 010 blocks all had 4-bolt main applications in '69 Corvette 350's.

 

[pws69]

Exactly - Thanks John!