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- Jun 7, 2021
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All depends on how much you want to spend. A relatively stock 400 will give you a lot of usable power. I would expect the stock 400 cast crank is good with over 400 HP, but RPM is the key. The 383 crank may a bit better. The 400 rods are just fine. I'd polish them & use top quality rod bolts. Shot peen them for added insurance. A lite piston is a big advantage with a selected CR. For a street car the most important part is the combination of cam and the heads. Iron OEM heads can make very good power. Modern aluminum heads will flow more than mildly ported OEM heads and will be better on today's gas at 10+ CR. I built two 400 blocks for my drag car, each with 440 steel cranks. One with the low deck rods & one with 440 LY rods. The short rod motor saw 7200 RPM all the time. But the 440 steel crank was only good for 350 or 400 runs. That same motor on the street at 6000-6500 RPM would last for ever, of course with a smaller cam.
Awesome info! Thank you for your comment. I really like the 400 motor. They are very durable.