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Chevy SB/BB Tall Block Cam Sync Plug

MSD's Chevy extra tall cam sync plugs install in place of a traditional distributor to drive the oil pump and provide a cam sync signal when running a Holley EFI, or other aftermarket sequential EFI system requiring a cam sync signal.

PART# 85142

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$306.00   Suggested Retail
$274.95   Your Price
Estimated shipping date: 04/22/2021
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MSD's cam sync plugs are the perfect solution when running an aftermarket sequential EFI system with coil-per-cylinder ignition. The cam sync plug installs in place of a traditional distributor, providing a hall-effect cam sync signal needed for the EFI system to reference the # 1 cylinder. MSD's cam sync is a plug and play with Holley EFI systems and can easily interface with most aftermarket EFI systems. The cam sync plug will have 2-3/4" of adjustment.


  • Built-in L.E.D. makes set-up and indexing quick and easy
  • Plug-and-play with Holley EFI and compatible with other aftermarket EFI systems requiring a cam sync signal
  • CNC billet housing with black anodized cap provide good looks and excellent durability
  • Chevrolet version is supplied with a equivalent Melonized distributor gear and adjustable slip collar for blocks with a non-standard deck height
  • 2-3/4” of adjustment for different deck heights
  • O-ring seals can be added to modified blocks to improve oil pressure control
  • Special oil tract improves lubrication to the distributor and cam gear
  • Shaft is guided by a sealed ball bearing and an extra long sintered bushing


ColorBlack and Silver
Distributor TypeCam Sync Plug
Emission Code5
EngineChevy Small and Big Block
GearCast, Melonized
Product TypeCam Sync
WarrantyLimited 1 Year Warranty
Part Number85142

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This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

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Warranty Information

Limited 1 Year Warranty: See Details
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