427 engine..

[Musclecarkid]

I checked with someone i know who has taken alot of virgin motors apart and here is what i was told,it kind of falls in to what i had stated.Hope it helps ! 1967 435hps taken apart for the first time have had 7115 cranks with very few exceptions, 2 bolt main 427 motors usually had 6223 cranks,only corvette w 2 bolt mains ever used a 7115 . 427 COPO 427s mostly had 7115. Impala and passenger 427 hi perf used 6223 exclusively,this is from a pool of around 150 motors that were taken apart seemingly for the first time. As far as L88 and ZL1 ,only 3 L88 and 1 Zl1 were taken apart like this and all had 7115, Still have yet to see a 6223 crank even in a new crate motor from the late 70s as has been claimed,although certainly a possibility 8 nos assemblys from the 70s have had exclusively #7115 cranks " There you go !

[nuch_ss396]

Hi Kevin,

I don't want to bang heads with you here but I have not
heard of one COPO 427 with a factory '7115 crankshaft.
Several members here own them, perhaps they would care
to elaborate.

Additionally, I addressed this very issue last year on
the NCRS forum and walked away with the understanding that
the '6223 crankshaft was the common crankshaft in use at the
time. It existed in various forms: standard, cross-drilled
and cross-drilled/tufftrided in both 396 & 427 applications.

The comment about the '7115 being used in conjunction with
the 12.5:1 pistons seems quite plausible to me.

[nuch_ss396]

Kevin,

I did learn that evidently some of the '67 L/71's used the
'7115 crankshaft as you indicated. That appears to possibly
be a 1967 situation only - though.

Steve