Thread: Terrible gas mileage,
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Old January 30th, 2019, 12:24 AM
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LEWISMATKIN LEWISMATKIN is offline
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Default Re: Terrible gas mileage,
Gents, a D engine would have ended production in '62. The .375"/.750" plug length problem ended in '63 with the appearance of the E engine. The picture you posted jagarra is a set of heads with the .750" reach plugs. The original AC plug for that engine was the 44NS non-resister plug. AC superseded all N style plugs with the XLS style plug. I picked up 2 sets of C44NS plugs on evil-bay several years ago. I like the "C" plugs because of the thicker electrodes these plugs have. The C plugs were originally the "commercial" version of the plugs the light duty engines use. The reach controversy arose because early engines were burning up plugs and cracking the heads around the plug port due to casting thinness. The .750" reach heads is the correction of this problem.
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