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The SBC was designed by a team of engineers from Pontiac, chey and corporate. The Chevy management wanted an engine that cost no more tham 143 dollars to produce, thus the stamped rockers and integral intake and the fact that only 9 cores were necessary to cast the block. In other words a very inexpensive engine (Cheep) The fact that it became the mainstay of street rodding was because of it's size and availability, However they didn't become competive untill their displacement was inlarged. The 302 and 327 were hard to beet, You can thank Zora for that.