Technical Need Camshaft Specs - 1967 - 427 / 435 H.P.

Trying to help a bud out who needs the original specs. Mostly he needs the duration.But would like everything.
Thank in advance to those helpful H.A.M.B. Chevrolet guys

Oldmics

 

crane replacement blueprinted cams. i know the one say 400 hp but added it anyway, hope it helps. other wise a degree wheel and a indicator will be the best way to find out.

Replacement for 400 HP 427 cu.in. (1st design L88) camshaft. BluePrinted 3925535
4400- 7200 part #968561
int 264@ 0.050
lobe sep. 112
open/close @ 0.050 24 60
lash .024
gross lift .560
exh. 269
open/close @ 0.50 70.5 18.5
lash .026
gross lift .580

Replacement for factory 430 HP 427 cu.in. (2nd design L88), ZL1 427 cu.in., LS7 454 cu.in. camshaft.
BluePrinted 3959180
4400- 7200 part #131141
int. 262 @ 0.050
lobe sep. 110
open/close @ 0.50 24 58
lash .022
gross lift .575
exh. 272 @ 0.050
open/close @ 0.050 69 23 .024 .615

 

1967 427/435 tri-power cam specs -
In O BTDC 44* In C ABDC 92*
Duration 316* Lift .520 Lash .024

Ex O BBDC 86* Ex C ATDC 36*
Duration 302* Lift .520 Lash .028

Chevrolet timing specs are checked at the lash values shown.
All Chevy high compression, solid lifter street engines used this cam.

 

Those are the numbers I remember on the chevy cam I put in my 396 360 hp 1966 chevelle SS

 

Am I reading this right? The L-88 cam has 264/269 degrees of duration at .050” lift? I understand that lobe separation is 112 degrees, but isn’t that duration an awful lot? I apologize for the probably dumb question, but I’ve never got to play with Big Blocks other than 366/427 stock truck engines. Is it safe to assume these are relatively high RPM cams. Thanks Guys!


Sent from my iPhone using The H.A.M.B. mobile app

 

I had 4 spd 4:10 gear it worked good

 

Taken from Chevrolet Power - 2nd Edition, 1976:

#3863143 Mechanical Camshaft 396-427 (L-78, L-72, L-71, L-71/L-89)
Intake: 0.024" Lash
Open - 44 degrees
Close - 92 degrees
Duration - 316 degrees
Net Lift - .500"

Exhaust: 0.028" Lash
Open - 86 degrees
Close - 36 degrees
Duration - 302 degrees
Net Lift - .500"
Overlap - 80 degrees

"All Chevrolet camshafts are timed to give split overlap at 4 crankshaft degrees before TDC. Both valves or lifters should be the same height off base circle at 4 degrees before top dead center as the number 1 piston approaches TDC during valve overlap."

"In the event you use a camshaft which has a groove in the rear camshaft journal, remove the rear camshaft bearing, solder up the oil hole and redrill it to .060" dia. A grooved rear journal was required for valve lifter oiling in 1965-66, but creates a major internal oil leak in later engines which can affect oiling system performance."