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SECTION 10
INSPECTION AND RECONDITIONING
1.125" —M18
1.390" ~-M20
Valve Guide
Depth
See Figure 10-5A for 30°
Figure 10-5. Valve Detalls (45? Angle).
30° CHANGEOVER
(See Figure 10-5A)
Beginning with Serial No. 1917809296, a new cam-
shaft and 30° exhaust valve and seat went into pro-
duction for all Magnum twin cylinder engines and
Short Blocks. Cylinder barrels are now serviced as #1
and #2 side. (The same barrel does not work for both
sides as it had previously.)
The new camshaft is marked with a circle (3/8" diame-
ter) of orange dye for easy part identification, The
new camshaft is available as a kit Part No. 82 755 13.
10.4
This kit includes a camshaft and four tappets. The
tappets included in the kit require a setling of
-003"/.006" intake, .013"/.016" exhaust.
When replacing the camshaft on engines prior to Seri-
8l No. 1917809296, also order and install valve kit
82 755 11 (for M18) or 82 755 12 (for M20). The valve
kit includes a 30? exhaust valve and valve seat. Re-
move the old seat, install new seat and grind the seat
to the 30° angle. The new 30° exhaust valve has а
clearance specification of .013"/.016".
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