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Here's something I have been wondering about. Around 1968 I think they started to put open chamber heads (906's) on 383, 440 engines. Prior to that were 516, 915 closed chamber with the higher compression chambers. When they switched to open chambers did they change the piston's? The compression would have dropped about a point or better I think and 1968 was little early in the detuning / emissions related hp reductions. Anybody know anything on this period?
 

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I would go to a Old Mopar site, there's a few Chrysler 300 sites. Alot (maybe all) of the old 300's and Newports of the late 60's had 383's or 440's in them. I believe that the 300 was stock 440, and the 440 was an option for the Newport which was normally a 383. Anyhow, may be a good source of 383 info.

Good Luck,

Preston
 

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Yep, they went to different pistons in '68, along with the open-chamber heads, so there is not a HUGE drop in compression between a '67 and a '68 440. There would be, however, if you decided to put 906/452 heads on a pre-68 block with pre-68 pistons...:)

JS
 
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