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My 69 RR, with a .060 over 383, pistons .065 in the hole, ran 13.08 at 105 mph................

it had bowl ported 516's with the 1.74 exhaust valve added.

NOT bad since it had a terrible 1.99 60' time. More hook/bite (better burnout) and with that mph 12's are not a problem.

The shortblock had unknown mileage since it came in the car with no known history. Pistons rocked in the bores at TDC.

The car weighed 3610 lbs with me in it.

Yep, 516's are a boat anchor/doorstop, BUT for an econo mild to warm application (especially a 383) they have their purpose.

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Same, same. My street 383 is built the same, in a 4000lb race wt Charger and ran a 13.1 at 105. I'm figuring its making 425.
Mine are shaved .060 with pistons .080 down,, can't run it on regular.

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Can't run it on regular ??? It's not like it has sky high compression.

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Our best pump is 91 oct shell. Anything less and it pings and knocks down low,, hard to shut down.
Just remembered the last motor I had in my race car was a 76 440 with bone stock 516s (lumps in the ports etc, but big ex valve) ran 12.27 at 109 in a 3450lb b body. The cam was only good till about 57-5800.
Put a shot to it before we yanked it and yielded 11.46 114.8 (125hp)

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