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Old 08-31-2008, 03:55 PM
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Roller 383 vs flat tappet 406?

Dollar for dollar which would be the better street engine? I currently have a roller set up for a factory roller block in a 350. But suddenly there are 400 blocks everywhere. So what to do. Do I give up the roller cam for 23 cubes. I know you can roller a 400 but is expensive and may do later if money is available. Its going into a light truck and will be a daily driver if fuel dosent go up any more. Will the 400 use gobs more fuel than a 383? i could use a smaller cam with more cubes and make same power? Thoughts.

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Old 08-31-2008, 04:07 PM
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400

If fuel counts, then a roller 350 with a "fuelie cam".
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Old 08-31-2008, 04:18 PM
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Yes, converting the 400 to roller will cost a lot. If the roller 350 block is in good shape and you can re-use parts in it and money is tight, build it instead to save some bucks.

Mark
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Old 09-01-2008, 07:18 AM
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The 400 based motor with a FT cam will never disappoint. Stroke it to 3.875 and suddenly the 400 based engine isn't just 23 cubes, it's the 383 + 10%. A FT cam in one of these big small block sings a tune you won't forget.
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Old 09-02-2008, 03:23 PM
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A stroked 400 comes with a hefty price tag. Money is part of the issue. I like power but not at 8 miles per gallon!
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Old 09-02-2008, 05:27 PM
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You asked for it, and it ain't Toyota. A stroked 400 is not too hefty a price considering what you get. The parts used are not much more than a run of the mill 383. The 383, compared to a stroked 400 will always leave you with that 'want some' feeling. Also, the TQ of the stroked 400 would make that truck run like a raped ape, and do anything you ever wanted it to. Power comes at a price. If you are looking for mileage I wouldn't do either motor, just a 350 stump puller with standard stuff. IMHO, any truck getting 10MPG is GOOD.
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Old 09-02-2008, 08:49 PM
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What 400 stroker kit would you recommend or do you piece it together yourself. It sound intrigueing. Does it have the same clearence issues as a 383. How big of heads for street use? My roller 350, desk top dyno 415hp gets 15mpg average driving. If a stroked 400 get half it might be worth it!
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