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Old 06-15-2010, 11:10 PM
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My 350 or 383 scenario

My story is actually much longer and frustrating than i will make it, to save you some time. I have been offered some brand new patriot freedom series heads, 225cc runners, 64cc chambers, cnc'd, valves, springs, roller rockers, and valve covers for $1000. My first option im considering is a simple clean up of a basic 350, then stick a lumpy cam and 10.5 pistons with the patriot heads and a used single plane intake and have cheap fun. Whats bothering me is will i be kicking myself if i dont go 383. Money is very tight for me right now. I can afford the 350 route, but the 383 would leave me eating mac-n-cheese for awhile. Im just asking for your opinions on what you think, or would do.

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Old 06-15-2010, 11:39 PM
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Quote:
Originally Posted by High School Hot Rod
My story is actually much longer and frustrating than i will make it, to save you some time. I have been offered some brand new patriot freedom series heads, 225cc runners, 64cc chambers, cnc'd, valves, springs, roller rockers, and valve covers for $1000. My first option im considering is a simple clean up of a basic 350, then stick a lumpy cam and 10.5 pistons with the patriot heads and a used single plane intake and have cheap fun. Whats bothering me is will i be kicking myself if i dont go 383. Money is very tight for me right now. I can afford the 350 route, but the 383 would leave me eating mac-n-cheese for awhile. Im just asking for your opinions on what you think, or would do.
I think you'll be a little over the top with 225cc intake runners on a 350. I think they're even too big for a 383. Would be just about right for a 408 with compression and cam. A high-rise, dual-plane intake manifold such as a Edelbrock RPM or Weiand Stealth will make more power from 1500 to 6500 rpm's than any other manifold you can run. If you need to make power over 6500 at the expense of lower rpm power, use a single plane intake. Just remember, over 6500 is gonna take a lot more money in the valvetrain.
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Old 06-16-2010, 02:53 AM
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I second that. If these heads are going on a street machine then you won`t like it. The low end response with a open plane intake, small carb and even a small cam will be really soggy due to the large ports, it won`t start to make any power until it gets over 3500 RPM. With a 383, it won`t be a whole lot better. You would need some really steep rear gears to make it driveable on the street. These heads are overkill for a mild combo street engine as they are aimed at high rpm power on a large cubic inch small block. The way to go for a street engine is Vortec heads. Since your 17, don`t be concerned with making big power numbers, cuz if you don`t know how to handle that power, you`ll find out you can`t enjoy a car dead or in a wheel chair.
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Old 06-16-2010, 07:25 AM
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the 350 will be cheaper and have plenty of power.you mite consider tradin them heads for some good 350 parts or sell em and buy parts for the 350.a car that comes alive a 3500 rpm's is a pita to drive on the street.
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Old 06-18-2010, 08:21 PM
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Ok i did some looking around and i found a good candidate. Its a 2 bolt 400, which to my understanding is stronger than a 4 bolt. But anyways my intentions where to have a fairly nasty street/strip engine. Now a cam with a duration of 233/241 and lift around .500/.525 (I just threw out some ball park numbers) and compression in the low 10's, would it eat enough air to make good use of these heads. Or are they just not what im looking for?....and on a side note will a stock crank and rods handle this power, and what are your thoughts on the stock length 5.56 rods. thanks guys

Last edited by High School Hot Rod; 06-18-2010 at 08:37 PM.
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