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Need a little more info for the guys to give their opinion. What the purpose of the engine, street, drags? What kind of car? more info the better. Whats the specs on the 505?
 

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I think he's talking about an Isky 505T. It's a solid lifter flat tappet cam used in a IMCA and Wissota modified, 2-bbl class running on 1/4 and 3/8 mile tracks. It's 254*/254* @ 0.050" tappet lift, ground on 108 LDA, 0.505" / 0.505" theoretical valve lift, 0.030" / 0.030" valve lash hot. Makes power from 3,000-7,000 in a 350. Would probably make power 1000 rpm's higher in a 283, so 4,000-8,000. You'd need 11.5:1 to 12.5:1 static c.r. to run this cam.

At 8,000, the 283 would be moving the same amount of air as a 350 at 6,500, so choose your heads accordingly.
 

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One more thing, if I were thinking about doing this, I'd get in touch with Brodix and figure out a cylinder head with 40 cc chambers so I could use flat-tops. A 0.030"-over 283 with flat-tops w/6 cc's of valve relief, an 8 cc gasket and zero deck will compute out to 11.9:`1 using a 40 cc head.
 
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