'67 Barracuda 500ci Restomod

blackhand said

If you add a decent closed chamber head that can flow well enough, then you should be able to get a decent amount of HP out of it. Also, what year of 400 and 727 are you working with? I recently discovered that since my engine and tranny were built in 1978 they probably have the lock-up torque converter. This presents a problem since there are virtually no transmission improvement kits for the lock-up 727...

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The 400 is a '73. I have to get a trans for it still...

The old 727/904 trick that I have always done revolved around pulling the valve body out a little ways and removing the accumulator spring. Then I'd adjust the line pressure almost all the way out (the allen head screw on the side of the valve body that sets in the spring). As far as I know, this trick works on all the old school 727's and 904's. It costs nothing to do it but a little time and a fluid change.

It worked killer on my former '71 Duster bracket car!!

Warning; If you want it smooth shifting, don't do this!!!!