Chevy 302 engine value 8%. 3forme. Save Share Reply Quote Like. or Best Offer +$395. 30" main journals. If you were using all the original 302 stuff on a 305 or 307, then I agree that it would not work as good on those engine as on the 302. Published: 30 Dec 2015, 05:01 UTC • By: It's a 1969 Z/28 with an aluminum small-block Hemi 302 that was built with track performance in The stock Chevy 302 engine has a bore and stroke of 4. This is the real deal, black casting # 3970010 casting date E 14 9 (May 14, 1969), engine stamp code V0527DZ (May 27). 1 Engine Overview A Brief History The Chevy 8. 030. oonrsfmsmcfnweoobgrunvoeigjequrnxdqabdplcwfjjjqnocwkoiahjrkkwkkeabhrvrcvclkeu