Indmar Marine Ignition Wire / Spark Plug Lead Set – 5.7L Chevrolet Small Block EST | Part #756002
Restore reliable ignition performance with this genuine Indmar ignition wire and lead set, specifically designed for the Indmar 5.7L Chevrolet small block engine with Electronic Spark Timing (EST). A complete set of ignition leads is one of the most overlooked tune-up items on marine engines — yet worn or damaged leads are one of the most common causes of misfires, rough running, and hard starting on the 5.7L small block.
Compatible with: Indmar 5.7L Chevrolet small block marine engines with Electronic Spark Timing (EST) fitted to Malibu, Moomba, Supra, and Tige boats. Contact us to verify fitment for your specific model year
What does the ignition lead set do?
The ignition lead set carries high voltage electrical pulses from the distributor cap to each spark plug — one lead per cylinder on the 5.7L V8 meaning 8 leads per set plus the coil lead. The leads must:
- Carry high voltage without leaking or cross-firing between adjacent leads
- Resist heat, oil, and moisture in the marine engine bay environment
- Maintain consistent resistance across all leads for even cylinder firing
- Connect securely to both the distributor cap and spark plug terminals
A degraded lead set causes exactly the same symptoms as worn spark plugs — making lead condition easy to overlook when diagnosing ignition problems.
Signs your ignition leads need replacing:
- Misfires or rough running that persists after new spark plugs are fitted
- Hard starting especially in damp or humid conditions
- Visible cracking, brittleness, or heat damage on lead insulation
- Carbon tracking — black lines along the lead surface indicating voltage leakage
- Leads feel stiff or have lost flexibility
- Burning smell from the engine bay under load
- Visible arcing in the dark between adjacent leads
How often should you replace them?
Replace your ignition lead set every 2 to 3 seasons or at the first sign of deterioration. Marine engine bays are particularly harsh on ignition leads — constant heat cycling, moisture, oil exposure, and UV degradation accelerate lead deterioration significantly faster than automotive applications.
Why marine ignition leads are different to automotive leads:
Marine ignition leads must meet strict additional requirements compared to automotive leads:
- Flame resistant insulation — critical in the enclosed marine engine bay environment
- Enhanced moisture resistance for high humidity and splash exposure
- Suppressed electromagnetic interference — required for marine electronics compatibility
- Higher heat rating for the elevated temperatures of enclosed marine engine bays
- Never substitute automotive ignition leads in a marine application — they do not meet marine safety or performance standards
Pro tip: When replacing your ignition leads always replace your distributor cap and spark plugs at the same service. The distributor cap, leads, and plugs form a complete ignition system — replacing one without the others means your new leads are working with worn components that will soon cause the same problems you just fixed. A complete ignition service done together saves labour costs and ensures reliable ignition performance for the full season ahead.
Pairs perfectly with:
- 491008 – Spark Plug 5.7L Standard Non-Catalysed
- 685007 – Raw Water Pump Impeller
Features:
- Genuine Indmar OEM ignition wire and lead set
- Designed specifically for Indmar 5.7L Chevrolet small block EST applications
- Complete set — all leads required for full V8 engine coverage
- Flame resistant marine grade insulation
- Enhanced moisture and heat resistance for marine engine bay conditions
- Suppressed electromagnetic interference for marine electronics compatibility
- Direct replacement — no modifications needed
Part Number: 756002
In stock and shipped fast from Australia 🇦🇺
