Does anyone have the stock lift numbers for an '81 Hydraulic cam?

I've got an unknown in there. This engine was set up with an offy and holley 390.... So I'm wondering what else might be inside.

Any thoughts on measuring without pulling the cam?

CJ

Bueler?... Bueler?

If you have a dial indicator, set it up to read the total movement at the pushrod end of the rocker arm.
Multiply the result by 1.5 (?)to get the valve lift.

Copy that. How much squish will I have at the lifter, since it's not pumped up?

Unfortunately, I don't have the lift numbers for the stocker..

CJ

Oops!
I'm red-faced at having forgotten you're using a hydraulic cam.
If I were you, I'd opt for removing the entire rocker shaft assembly and setting the dial indicator at the end of the pushrod. "Squish" shouldn't be a factor that way, and you'll get an accurate enough reading to tell if you have a stock cam.
Chilton manual (questionable accuracy) lists the lobe lift for '81 as .378",
but when you factor in the rocker ratio it comes out to something like .567" at the valve (which I find hard to believe), so I'll say that the .378" is at the valve.
Maybe someone can jump in and clear up this apparent confusion.

NHRA TECHNICAL SPECIFICATIONS FOR 1981 IS .410/.419

_________________
1989 gators super comp winner

NHRA Technical Specifications








Issued: 25 July 1981
Revised: 2-16-96, 7-1-96, 5-13-03
Bulletin #: CHRY-81 Page 1 of 1
Specifications for the 1981 Chrysler Corp engines.

HP Disp Mfg C.R. Ind. Make Model/Transmission Manifold R.R. Lifter Head cc Notes

63 105 DP 9.89 1-2 H-W R-9052/SM 9054/AUTO 5240374 None M 21.3 1,D
64 86 DP 9.40 1-2 MK 28-32 DIDTA-200/SM 201/AUTO   None 1.55 M 31.3 E
72 97 DP 9.00 1-2 MK 28-32 DIDTA-202/SM 203/AUTO   None 1.55 M 35.5 2,E
84 135 DP 9.72 1-2 Holl R-9064,5/SM 9602,3/AUTO   5214616 1.61 H 50.6 3,F
90 225 CDP 9.20 1-1 Holl R-9687,95/Auto 4095223, N-5 1.50 H 54.0 A
92 156 DP 10.03 1-2 MK 32-35 DIDTA-30,31/AUTO ONLY   None 1.55 M 50.2 E
105 156 DP 10.03 1-2 MK 32-35 DIDTA-50/SM 51/AUTO   None 1.55 M 50.2 4,E
110 225 CDP  9.20 1-2 Cart BBD-8290,8291/AUTO   4095223, N-6 1.50 H 54.0 A
130 318 CDP  9.10 1-2 Cart BBD-8291,8292/AUTO   4100331, N-7 1.50 H 64.5 B
140 318 C    9.10 EFI NA   4201397 1.50 H 64.5 B
165 318 CDP  9.10 Cart TQ-9364,72,73/AUTO   4100340, N-8 1.50 H 64.5 B
170 318 CDP  9.08 Cart TQ-9364,72,73/AUTO   4100340, N-8 1.50 H 65.5 C


C = Chrysler engines D = Dodge engines P = Plymouth engines

Cylinder Head Castings
A=3698447,4095778,4104362 B=4027163,4027593,4323302,444308, 4772576
C=4027596,4071051,4448308,4772576
D=5240402,3,76,835 E=No casting # available F=5203655
1 - Alt carbs R-9053,6,7/SM R-9055,8,9/AUTO
2 - Alt carbs MK 28-32 DIDTA-204/SM 205/AUTO
3 - Alt carbs R-9650,2,3,4/SM 9604,5,84,5/AUTO
4 - Alt carbs MK 32-35 DIDTA-52/SM 53/AUTO
5 - Alt manifold 4104549,4104580
6 - Alt manifold 4104578,4104595
7 - Alt manifold 4104506,4201120
8 - Alt manifold 4173915


HP Disp Mfg Deck Piston Height Vol Valves Cam Lift Gasket Springs

63 105 DP .080 Dished .125 7.5 cc 1345/1235 419/419 .068 Outer & Inner
64 86 DP .050 Flat 1340/1190 380/380 .040 Outer Only
72 97 DP .000 Dished .100  8.2 cc 1500/1224 395/395 .045 Outer Only
84 135 DP .010 Flat 1598/1394 445/445 .068 Outer Only
90 225 CDP .115 Flat 1620/1360 410/419 .020 Outer Only
92 156 DP .000 Dished .100 12.0 cc 1800/1500 425/425 .035 Outer Only
105 156 DP .000 Dished .100 12.0 cc 1800/1500 425/425 .035 Outer Only
110 225 CDP .115 Flat 1620/1360 410/419 .020 Outer Only
130 318 CDP .041 Flat 1780/1500 390/420 .030 Outer Only
140 318 C .041 Flat 1780/1500 390/420 .030 Outer Only
165 318 CDP .041 Flat 1780/1500 390/420 .030 Outer Only
170 318 CDP .041 Flat 1880/1600 390/420 .030 Outer Only

_________________
1989 gators super comp winner

Thanks for the info!

I'll check at the lifter body now that I have the head off.

CJ