Need help with Hydraulic Roller Lifters

[car4jim]

It's a Comp Cams 33-000-9 which probably doesn't help. I can provide the grind card if more info is required.

Gross Valve Lift: Intake: 0.645", Exhaust, 0.635"

Erson Lifters 1.76 ratio

Lob Lift: Intake 0.3670" Exhaust: 0.3610"

Intake 0.367" * 1.76= 0.645"

Exhaust 0.361" * 1.76= 0.635"

That seems to be the right calc since the result equals the gross valve lift. This cam must have been ground for 1.76 ratio rockers?

[Gaz64]

So now you see as Blykins says, you can't measure valve lift at the retainer with a hydraulic lifter.

Your 33-000-9 is a custom ground race billet.

262 @ .050 is a not a baby cam.

Here's some info from another forum thread:

This is the Comp Cam that's going in my 457FE:
Camshaft: Comp Cams custom grind 33-000-9
Intake Exhaust
Valve Adjustment HYD HYD
Gross Valve Lift .659 .659
Duration @
.006 Tappet lift 317 317
Valve Timing Open Close
@ .050 INT: 23 BTDC 59 ABDC
EXH: 59 BBDC 23 ATDC
These specs are for cam installed
@ 108.0 Intake Center line
Intake Exhaust
Duration @ .050 262 262
Lobe lift .3810 .3810
Lobe separation 108.0

My next question is do you have the valve springs off to measure them or have you got that info from elsewhere?

Does the outside of inner spring touch the inside of the outer spring? Helps to combat spring surge.