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Your cart is empty.Fits GM V-6 engines with Thunderbolt IV & V HEI ignitions
Part # : 815407Q 5
Sh. Wt. 1 lb.
Michael
2025-08-22 21:07:29
Good fit, fast shipping
abcde
2025-08-11 15:55:56
Perfect replacement for my 1998 4.3L mercruiser.
S L
2025-08-06 10:13:23
Worked for my 1998 Mercruiser 4.3 L
Cogswheel
2025-07-25 17:55:52
It is oem and works perfect on my 4.3 mercruiser thunderbolt iv system
edwin lemoine
2025-07-19 10:43:08
Works As it should !
Victor
2025-06-10 16:10:39
Great
Matt
2025-05-16 16:02:14
Matched original cap n rotor assembly, bolted right on and marked for plug location n firing order.
frank c
2025-04-14 13:56:01
Nice quality. As described.
Alex fournier
2025-04-01 13:22:55
Qualité original a bon prix !
M.E.
2025-03-18 15:27:12
Fit 4.3 vortex efi
Rob
2025-02-11 15:16:17
Quality and fits 2010 4.3 mercruiser TKS
Fit right onto the distributor. Works excellent
2025-02-07 11:26:55
Fit right onto the distributor just like the old one. Quick excellent service
Jeremy
2025-01-06 17:21:47
1987 4.3L Mercruiser 205Thunderbolt 4 IgnitionI bought a used boat with no water test. It ran great on the trailer. Not so good in the water. It could barely get on plane. When it did, It couldn't get above 3800rpm and 44kph max. Tried spraying starter fluid in the intake which had no effect. This told me that fuel delivery was not the issue.Swapped out the cap and rotor. Old one had corrosion on the internal contacts. Fired the boat up and it was now idling at 1000rpm. I turned down the idle screw on the carb and checked the timing. Found it was out 4 degrees.Boat runs like a top now. Couldn't be happier.
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