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Miscellaneous Automotive
Car Performance & Repair
WTH is a 2bolt & 4bolt main?
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<blockquote data-quote="Polecat" data-source="post: 802046" data-attributes="member: 554260"><p>no, there were two different castings, 509's were better...there were:</p><p></p><p>casting 3951509, came out in 70-71 and they all were 4 bolt mains, then castings 3951509, from 74-80, were two bolt, these are the years to have, then in 70-73, casting 3951511, were 4 bolt, but some from the factory outlets had some 2 bolt mains.</p><p></p><p>My 406 I built was a 509 casting, 74-80, 2 bolt...and I had an eagle rotating assembly, crank, 6" rods, JE forged pistons, etc...11:1, dart Pro 1 aluminum heads, 1.6 Comp roller rockers, RPM inatke and Holley HP series race carb...man, I miss that engine. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif</p></blockquote><p></p>
[QUOTE="Polecat, post: 802046, member: 554260"] no, there were two different castings, 509's were better...there were: casting 3951509, came out in 70-71 and they all were 4 bolt mains, then castings 3951509, from 74-80, were two bolt, these are the years to have, then in 70-73, casting 3951511, were 4 bolt, but some from the factory outlets had some 2 bolt mains. My 406 I built was a 509 casting, 74-80, 2 bolt...and I had an eagle rotating assembly, crank, 6" rods, JE forged pistons, etc...11:1, dart Pro 1 aluminum heads, 1.6 Comp roller rockers, RPM inatke and Holley HP series race carb...man, I miss that engine. [IMG]//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif[/IMG] [/QUOTE]
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WTH is a 2bolt & 4bolt main?
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