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FWIW...my 383 was doggy with the big open chamber 906 heads. With a set of 516s on her now she is a totally different animal and she is running the .474 cam. It DEFINITELY puts you in your seat and will annihilate the tires from a stop.

So my says that you may be very low on compression and that is really all you need to work on.



stock pistons ?



No it has been rebuilt. the problem with the first build and the 906 heads was the KB162 pistons which are something like a mile in the hole with huge 5cc valve reliefs. My compression on the first build was around 7.8:1.

Now it has the same pistons, but the deck was milled 0.020 and with the 516 heads and the felpro gasket i get a CR of 9.2:1 which really woke the motor up.

'73 GK6 Challenger Rallye - 340 4-Speed