Of interest, in the new HPP magazine there is a 1979 Trans Am with a built Olds 403cid motor and used primarily for street duty. They used Bulldog aluminum heads that have a 240cc intake runner volume as cast and flow about 290 cfm out-of-the-box. Motor cranked out a very nice 517 hp and it made it's peak power at only 5,700 rpm on the dyno. It used a 238 degree hyd roller cam.
408 cid - 240 cc runner - 238 degrees duration - 5700 rpm - street duty
( FYI the article was written by our good friend here on the board Rocky Rotella. As usuall another fine job by him )
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