DISTRIBUTOR GEARS (M-12390-B)

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Item Number: M-12390-B

Manufacturer: Ford Racing

Manufacturer Part No: M-12390-B

Quantity:

PART NUMBER	MATERIAL	COLOR	DIAMETER		APPLICATION
M-12390-A	Cast Iron	Orange	1.249"	0.467"	289/302 hydraulic flat tappet engines with point-type or Duraspark distributors. ¹
M-12390-B	Steel	None	1.249"	0.467"	302 with steel billet and production roller camshaft with point-type or Duraspark distributors. ¹
M-12390-C	Bronze	Bronze	1.249"	0.467"	All 289/302 engines with point-type or Duraspark distributors. ¹
M-12390-F	Steel	Yellow	1.249"	0.531"	All 302/351W hydraulic roller tappet engines with EFI and 351W Duraspark. ¹
M-12390-G	Cast Iron	Green	1.421"	0.531"	All 351C/351M/400/429/460 engines. ¹
M-12390-H	Bronze	Bronze with Green Stripe	1.421"	0.531"	All 351C/351M/400/429/460 engines. ¹
M-12390-K	Polymer	None	1.249"	0.467"	289/302 all camshafts with point or Duraspark distributors
M-12390-L	Polymer	None	1.249"	0.531"	302EFI/all 351W all camshafts

Material Selection Notes:

Cast iron gears are compatible with cast iron camshafts (hydraulic or solid flat tappet type).
Steel gears are compatible with billet steel camshafts (hydraulic roller tappet type).
Bronze gears can be used with either cast iron or billet steel camshafts. They are usually recommended by manufacturers of aftermarket billet steel solid roller tappet camshafts. Since the bronze is softer than cast iron or steel, it will wear at a faster rate.
Polymer gears are compatible with all camshafts.
IMPORTANT INSTALLATION NOTE: ¹Distributor gears do not have pre-drilled holes. See instructions included with part, call the Techline (1-800-FORD788) for a faxed copy, or visit fordracingparts.com.