Big end issue
- Thread starter Roscobbc
- Start date
67HEAVEN
Well-known user
Yours sounds excellent, Roscobbc. I'm sure it gets lots of attention in the UK.
I'd say the duration and overlap (perhaps the lift too) are a bit more extreme on the L88 cam. Here are the '67 and '68 specs:
int. opens BTDC/62
int. closes ABDC/115
intake dur./354/357
lobe center/117
intake lift/.540
exh. opens BBDC/108
exh. closes ATDC/72
exh. lobe center/360
exh. lift/.560
dist. centers/136
valve overlap/133/134
Strangely enough, I posted a video of two L88s just a few hours ago.
Post #21 in this thread - RPO L88 - the torch was passed from the 1963 Z06 and the 1963 Grand Sport to these
P.S. The ZL1 cam which I ran for a number of years is more extreme than the above specs.
I'd say the duration and overlap (perhaps the lift too) are a bit more extreme on the L88 cam. Here are the '67 and '68 specs:
int. opens BTDC/62
int. closes ABDC/115
intake dur./354/357
lobe center/117
intake lift/.540
exh. opens BBDC/108
exh. closes ATDC/72
exh. lobe center/360
exh. lift/.560
dist. centers/136
valve overlap/133/134
Strangely enough, I posted a video of two L88s just a few hours ago.
Post #21 in this thread - RPO L88 - the torch was passed from the 1963 Z06 and the 1963 Grand Sport to these
P.S. The ZL1 cam which I ran for a number of years is more extreme than the above specs.
Roscobbc
Moderator
Yes cam is relatively mild hydraulic flat tappet (if I remember correctly) at 230/242 @ .050" - lift is .560". Lobe ramps are quite 'aggressive' - with oval port heads it pulls from 1200 rpm - power band is from 1800 rpm through to 6200 with peak torque at 3850 rpm. Really needs an overdrive though.....
N
Norm
Guest
Ross, your's sound's great. It seems both, set up for racing, have a commanding presence and lots of lope, which is desirable and a must for that style car and engine. Always head turners and screamers going down the road. 