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Old 01-13-2013, 08:58 AM
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Not here to argue with Fbird,but I disagree with using a short duration high lift cam and a lot of porting on the GM 461s. You do not need that much head flow and you do not want to open the intake runners. The 461s will flow 200 plus CFM on the intake side {plenty for a 283).I would use a lower lift cam,again,its a small engine does not need huge flow. I would use a little more duration( like I posted) to give the cylinders "time" to fill at higher RPMs. I would use a low intake center line cam,as most engine builders use in smaller engines.
porting the exhaust side is good in any GM head. If you decide on a roller cam(very good choice,but costs a little more) I would use similar specs,of course the lift will be slightly higher.
The 461s can be used with 2.02 valves.
If you decide at any time that you will rev the engine past 6500 rpm,then a rod upgrade is in order.

re disguising a 350 as a 283,,,not possible. You have to decide what engine and why you want it. A stockish 350/383 will get there and probably a lot quicker.
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