‘
Lots of hits Googling indicate 9181 is ZL1 Factory Part # 3959180.
Below specs w/ L88 comparison from Post 15 @ this link…
https://www.camaros.net/threads/pain...8-motor.86841/
~ Pete
.
L-88 427 430 HP Solid flat tappet 354° int 0.562" int
(Advertised) part # 3925535 360° exh 0.584" exh
Duration @ .050 Int./Exh. 264 / 269 Degree Lobe Separation 112
Lash Hot Int./Exh. .024 .026 RPM operation 4400-7000
Open/Close @.050" Cam Lift Int./Exh. 24**** 60 70.5** 18.5
ZL-1 427 Solid flat tappet 262° int 0.580" int
@0.050 lift part # 3959180 273° exh 0.620" exh
Lobe separation angle 110°, lobe centerline 106°/114°
Intake opens/close 52 BTC/95 ABC, Exhaust 94 BBC/59ATC
.