Cam and valvetrain longevity....??? low duration high lift...
#456
Registered
Nope No 4A. However some had small shaft 19 splines and they were upgraded to 26 Spline. Parts were always tough for the 4's because they just didn't make many and then stopped. Short span of years.
#457
Registered
Yep. I have small shaft 4's. They use the same lower gearsets as the big shaft drives if i recall. The upper gears are different due to the polygon vertical shaft . Some 4's came right from merc with big propshafts
#459
Registered
But the 40 with Konrads runs 75 with 630HP 540's. For Sale too!