this is for the GM hot cam , can't find too much info on this cam, this is all I have 218 @50 int, 228@50 ex, 525 int, 525ex .

 

This info came back in all of two seconds on Google...

Source: http://www.sallee-chevrolet.com/Cam_...hotcamkit.html

Part Number: 24502586
Engine Application: SBC - Gen 1, Gen1E, and Gen 2 1986 to present.
Lifter Type: Hydraulic Roller
Engine RPM Range: 1500-5500
Grind Number: Not Available
Serial Number: Not Available
ADVERTISED CAMSHAFT SPECIFICATIONS
INTAKE: N/A N/A Clearence Hot: N/A
EXHAUST: N/A N/A Clearence Hot: N/A
The specifications listed above are based on a rockerarm ratio of -.-- IN -.-- EX

RECOMMENDED VALVE SPRING INFORMATION
Part #: 12551483 Single: X Dual: Triple:
Outside Diameter: 1.32” Pressure At Installed Height: 101 lbs.
Installed Height: 1.780” Valve Spring Seat (shim): 10212809
Solid Height: 1.215” Valve Spring Retainer (cap): 10212808

Information For degreeing cam and correct only at .050” tappet lift
INTAKE Opens: N/A Closes: N/A
EXHAUST Opens: N/A Closes: N/A

These specs are for cam installation at 109 intake centerline
LOBE SEPERATION 112°
DURATION AT .050” (Duration measured @ cam lift.) Intake: 219° Exhaust: 228°
DURATION AT .006” (Duration measured @ cam lift.) Intake: 272° Exhaust: 281°
LOBE CENTERLINE Intake: 109° Exhaust: 115°
LOBE LIFT Intake: 0.328” Exhaust: 0.328”
GROSS VALVE LIFT (1.6 Ratio Rockers) Intake: 0.525” Exhaust: 0.525”
GROSS VALVE LIFT (1.5 Ratio Rockers) Intake: 0.492” Exhaust: 0.492”
VALVE ADJUSTMENT Intake: Zero Lash Exhaust: Zero Lash

NOTES
A Valve Spring Kit is available as P/N 12495494 and includes 16 of P/N 12551483 valve springs.
A Valve Spring Retainer (Cap) Kit is available as P/N 12495492 and includes 16 of P/N 10212808 valve spring retainers.

 

IVO by my quick and crude calcs is 27º BTDC.

edit: Perhaps I need a reading comprehension course......

IVC is 65º

-Mindgame