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BOP Pontiac Polymer/Composite Distributor Gear, .500 For MSD, Pertronix (non HEI), Holley, & FAST
BOP-PDG38
Pontiac polymer distributor gear, .500" shaft, for roller cams. For MSD, Pertronix (non-HEI), Holley (incl. HyperSpark) and FAST only. Factory GM HEI, Pertronix HEI, points, Mallory, TSP and RPC need the .491" BOP-PDG37.
Pricing:
$149.95
Description
Confirm your distributor shaft size — this gear is .500"
- Shaft size is the #1 reason these gears come back. .491" and .500" look alike but are not interchangeable.
- Use this .500" gear with: MSD, Pertronix (non-HEI), Holley (including HyperSpark), FAST.
- Need the other size? Factory GM HEI, Pertronix HEI, points, Mallory, TSP and RPC distributors use the .491" BOP-PDG37.
- Not sure? Check your shaft diameter to confirm size before ordering.
- Ram Air V / 455 SD cam? Use BOP-PDG39 only.
Which Pontiac Gear Do I Need?
| Gear | Use with |
|---|---|
| BOP-PDG37 — .491" shaft | Factory GM HEI, Pertronix HEI, points, Mallory (Mallory must be drilled for the larger-diameter pin), TSP RTR, TSP Pro Billet, RPC S3922 / S3922BK |
| ► BOP-PDG38 — .500" shaft | MSD, Pertronix (non-HEI), Holley (including HyperSpark), FAST |
| BOP-PDG39 — .491" shaft | OEM-type 455 SD and Ram Air V cams ONLY (smaller cam gear sizing) |
Roller Cams & Polymer Gears
- Roller cam? You need this gear. Most distributors ship with steel gears, and a steel gear can damage a roller cam. Use a bronze or polymer gear with any hydraulic or solid roller cam.
- Flat tappet cam? The polymer gear is a roller-cam requirement, not a flat-tappet one.
- Why Butler uses polymer over bronze: in Butler's experience polymer gears last longer than bronze, and bronze debris in the oil can cause problems with hydraulic roller lifters of any brand. With polymer you never have to worry about metal shavings in your oil.
- Roller lifters with good oil pressure put a little more load on the distributor gear — that's expected.
More: Pontiac Ignition Systems
Not sure which one you need? Ask a tech question or call 866-762-7527 before you order.
Details
- BOP-PDG38
- BOP-PDG38
- BOP
- New
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- Ignition/Electrical - Distributor Gears
- Valvetrain Components - Camshaft Accessories
Shipping Information
- Item Requires Shipping
- 0.3 lbs.
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