Distributor Gear, Reverse
Alloy steel distributor gear for cast camshafts, or those camshafts with an integral cast distributor gear.
Mallory Distributor Gears are precision machined from alloy steel in our factory to exacting original equipment specifications. Special attention is given to the heat treating requirements of each gear to assure the proper hardness, giving trouble-free service when used with proferal billet (hydraulic and mechanical flat tappet) and selectively austempered ductile iron billet (hydraulic roller tappet) camshafts.
Available for Mallory, original equipment, and other aftermarket brand distributors.
FEATURES:
- REVERSE Gear
- Fits 1969-95 Ford (351W) V8 engines
- 0.531" ID (shaft diameter)
What do you mean when you state REVERSE gear?
ANSWER: Certain engines, typically dual-engine marine applications, have various combinations of camshaft and timing drives on one of the engines. Example, a typical engine has a camshaft and timing chain set (two gears and a chain), but on some marine applications the drive after the engine needs to spin in reverse. Since most of these drives are 'direct' the engine now needs to spin in the opposite direction at the crankshaft. To accomplish the reverse rotation requirements these engines may have a reverse ground camshaft, 2-gear timing drive, or various combinations of each. But, the distributor is still going to spin the normal direction. In the case of this SB Ford, it is LH (left hand) distributor rotor rotation, or counter-clockwise. Even with the reverse gear this rotation stays the same.
This gear has the teeth cut the opposite angle of the standard gear so as to mate with a reverse-cut camshaft.
I hear from cam grinders and engine builders about the need for the correct gear material for my camshaft. What does that mean?
ANSWER: As stated in the description above, this alloy steel gear mates with most all camshaft materials. If, and ONLY if you have a one-piece billet steel roller camshaft do you need to go to the aluminum/bronze gear. You DO NOT want to use the aluminum/bronze distributor gear in any other application. The aluminum/bronze gear wears at a much faster rate and needs to be inspected and replaced regularly making it not the best choice for street applications. Unless you absolutely must use the aluminum/bronze gear for your camshaft this alloy gear is the best choice.
Does this gear fit distributor brands other than Mallory?
ANSWER: The gear ID (inside diameter) is identical to that of a factory Ford/Motorcraft distributor gear. Therefore you can use this gear on any distributor for the Ford 351W where the shaft diameter is the same as the original 0.531".
This gear only has a pre-drilled hole on one side, it is not drilled all the way through both sides. How do I drill through the other side of the gear to get it to fit my distributor?
ANSWER: Most distributor shafts/gears are drilled slightly off-center. This is to prevent the roll pin from coming out. To mount this new gear you first need to verify the current hole diameter through the distributor shaft. Grab the correct sized drill bit and a hand drill. Slide the new gear on the shaft and hold it in your fingertips and braced against your workbench. Align the first hole, insert the drill bit and while holding firmly and drill through the opposite side of the gear. DO NOT ream or apply multiple passes through with the drill bit. One pass through and you're good. Insert the roll pin and you're done.
