Originally posted by: Iron Woode
Originally posted by: Roger
348
Edit;
Sorry, didn't see the info thing
This 348 eventually became the infamous "409"
Damn!!!!
I need to make these questions more obscure.
The 348/409/427 was Chevy's first BB. They were called W engines because of their
canted valve heads with highly scuplted valve covers. They were based on a block with a 74 degree angle instead of the usual 90.
Hmm, some clarification is in order here. The W motors did not have canted valves, the Mark IV (366/396/427/454) engines did. The W motor valves all operated at the same angle, but they weren't in-line across the head (perhaps that's what you meant, and that's the reason for the 'W'-shaped valve covers). And the cylinder bore angle of the W motor block was 90 degrees, the angle between the decks was the unique characteristic, it was over 90 degrees (can't find the exact number right now :| , but the reason for this was that the combustion chamber in these engines in within the cylinder bore, not the cylinder head)
JC
Oh, and I'm still stumped by Roger's question
But Roger, the Z-11 427 was the Mark II 'Mystery Engine', not the Mark IV 396. From the link
you found:
"The exiting new Mark II 427 was put on hold and forever became known as the "mystery engine"."