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Old 08-17-2010, 06:42 PM
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283 head questions and options.

Hi guys,

This fall im gonna be rebuilding my worn out 283. Its gonna be going infront of a powerglide, 4.10 rear end gears all inside a 62 gmc half ton. Im looking for a good crusing motor, I have a set of 434 heads that have been rebuilt with new seats and stock size valves. I wanna run a cam with .501 lift on it. Would these heads work? or should i just spend some money, buy some e-street heads, build it for 10:1 compression?

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Old 08-17-2010, 10:14 PM
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We usually recommend the 416 castings 305 heads for 283`s but what you have will work. If your cam is a flat tappet and has .501 lift, it`s way too big. The 283`s short 3 inch stroke isn`t exactly a torque maker and it needs all the low end torque it can get. I wouldn`t go over .210 duration @.050 on a 283 set for street duty, big cams in 283`s are for making them into high revvers. You have to consider also, sure, you could move up to high flow aftermarket heads, but the large ports and valves will cause a even bigger loss of low end power, it`ll be a complete turd on take off, even with 4.11 gears unless you really rev it. Small cubes need high velocity which means smaller ports, smaller valves plus smaller cams. If your looking for a lopey idle then the comp cams high energy 268H is all you need. It has .218 duration @.050 but won`t kill off low end torque plus it`ll give it a lopey idle and will work with the rest of package. Make sure you add headers and a small carb. A Quadrajet would be ideal.
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Old 08-17-2010, 10:18 PM
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If i kept the stock heads, i believe they are just the standard power pack heads, aluminum intake, headers, q jet, then could i run the comp cams 268H cam? or will i have to change things to the heads? the engine came hydraulic flat tappit and would like to keep it that way
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Old 08-18-2010, 02:27 AM
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There's good 283 build Info here>> 283 sbc questions
The XE262H may work better as All Comp cam's operating ranges are for 350ci. engines so in a 283 these will be at much higher rpm range.
The 601 305 Heads have 53cc & flow better than the 58cc 416's, will give the 283 more Compression.
Techinspector1 has lots of Info & Dyno #'s on link above.
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Old 08-18-2010, 05:31 AM
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Another option for you to explore is the casting #059 L30 305 Vortec head. I know if I were building a 283, the L30 Vortec heads would be going on it.

More: http://www.nastyz28.com/forum/showth...=56505&page=32 post #478.

Good luck w/whatever you decide to use.
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