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Old 08-04-2006, 06:38 PM
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which heads came with this block?

Which heads would have come with a 1974 Chevy 427 tall deck(block # 340220) How good would these be for making streetable power and what are the valve sizes? Does anyone know how much power this motor would have made from the factory? Thanks Brian

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Old 08-04-2006, 07:15 PM
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Most likely peanut port heads but could be the larger ovals...? The peanut ports would be good for maybe 4K rpm and were designed mainly for nothing but torque... If they are large ovals then they would work good up to around 5500rpm and the valve size for either is 2.07/1.72 (intake/exhaust)... If you install the larger 2.19/1.88 valves that came in the rectangle port heads then the large ovals work great up to around 6500 rpm... The peanut port heads would see no improvement with the larger valves and might even suffer a loss...

If you have the engine just pull the valve covers and get the casting numbers on the heads... That would make things much easier to figure...
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Old 08-04-2006, 08:23 PM
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Do you think the performance advantage of the extra .400 deck height of a tall deck is worth the extra trouble of the fit and clearance issues with the headers, intake, and ditributor? Also, is it true that these came with factory forged cranks? thanks, Brian
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Old 08-04-2006, 09:07 PM
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IMPO... The tall deck is not really worth having to deal with... Its good if you have the extra cash and time to find all you need... A standard deck block is a much simpler approach and will make all the power you need... Also on the crank yes it should be a forged unit, but some later engines did have cast cranks in the 3.75 stroke...
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Old 08-04-2006, 09:18 PM
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These are not high HP units stock, but huge gobs of torque. Like Bumpstick said, they're not much good past 4-4500 rpm, and if you push them too much past, they have a tendancy to come apart. The came stock with huge, heavy, 4 ring pstons, and while some of them came with impressive camshaft duration #'s, none were "hot rods" stock. There are performance parts availiable, hardest thing to get is a decent intake,but because they are different than your standard big block, the parts are more expensive.
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