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VM's Top Shaft with Optional Bearing

For our heavy duty aftermarket top shaft, we begin with billet 4340 aircraft grade steel shaft and fully machine the splines and all required features.
After machining, the new top shaft is sent out for heat-treatment where it is thru-hardened. Upon return from heat-treatment the shaft undergoes full quality inspection for hardness and straightness. This top shaft then has the bearing surfaces precision ground via an in-house cylindrical grinding operation.
It is this combination of superior alloy and thru heat-treatment that yields the most durable aftermarket topshaft on the market.
This item is built in-house by VM to our exacting standards.
Don't get fooled by others offering "hardened top-shafts" or top shafts built from 8620 alloy and then case hardened for superficial surface hardness when you need a thru-hardened top shaft.

For stiffness to resist twisting and shearing unlike any others, our 4340 top shaft is your solution.

This super strong aftermarket top shaft is a replacement for the Cub Cadet (No. 384703R1) shaft.
Application: CUB CADET

FEATURES

• High tensile strength ductile iron material 
• Critical gasket, seal, bearing surfaces and bolt holes established (cylinder head, oil pan, cam cover, valve cover, etc)
• Stock K341 deck height (Pro Stock spec)
• Stock K341 head bolt pattern (Pro Stock spec)
• Stock K341 camshaft position (Pro Stock spec)
• 5/8" Lifter bores with bronze bushings installed at correct angles
• Valve guide positions established at correct angles 
• Pre-drilled for pressurized oil system ports
• Internal clearance for the largest lifters and highest lift cams
• Internal clearance for the connecting rod at the bore base
• 3.970" Rough bore over the crankshaft centerline
• Valve angles/positions as well as the head bolt patterns are optimized for pro stock
• Accepts stock points ignition

What you need todo

• Cut intake/exhaust port to the valve
• Drill and tap intake and exhaust manifold bolt patterns
• Install valve guides
• Cut valve job
• Bore and Hone

Lobes built up with a hard face overlay before regrinding the camshaft.

No core swaps.