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Old November 15th, 2014, 02:02 AM
bigblockv6 bigblockv6 is offline
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Default Re: Forced Induction

I'm aware the 305E is not a magnum, however there are different 305s. There is an A, B, C, D etc. Difference in intakes and heads is my understanding. Still not a "magnum" though.

Of course we still have no clue as to how many RPMs we can squeeze out of one of these engines because nobody has done this before. We'll have to see how much weight we can remove, judge the strength of everything, do some calculations, and guestimate a max .

The difference from A through is A and B engines produced from 1960-61 were equipped with 1 bbl carbs. The A engine used in light duty trucks had the Holley 1 bbl and 3 rings per piston, the B engine used in medium duty trucks used a Zenith 1bbl carb and had 4 rings per piston. The 305C used in medium duty trucks from 1960-74 had the Stromberg ww carb and 4 rings per piston. The 305D basically a Stromberg 2bbl version of the A was introduced in 1961 and replaced with the 305E. At some point after these years mentioned the 305E and C engines did get larger diameter exhaust valves. As far as nobody doing what you're attempting, it has been done before, Babe Erson brother of Sig Erson(Cams) built a 478M with lighter Chrysler 426 Hemi rods, turned down the journal diameter of the rod journal, ran higher compression custom pistons with 3 rings, custom cam and 4bbl carb to achieve a 5500 rpm screamer out of a GMC 478M V6 that could take on a mildly built 454. There's no substitute for cubic inches, I would not waste the time on the 305 as heavy as it is for that little bit of displacement, you can take the same engine block that house 400 plus cubic inches of displacement. We had a member a couple years back take a 478 and basically apply Babe Ersons formula but he also stroked the crank and had Manly custom stainless steel valves made to replace the hollow stem sodium filled exhaust valves that snap from over revving, by the time he was done this engine has a displacement of 523 ci. I also dumped the 305 in my 68 KM2500 for a mildly built 478M V6.
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