273 Head Question

[David Lee]

I have a 1966 Dart GT w/ 273 c.i. engine. I am curious if milling the heads say "20,000 th or so will increase my compression ratio and power? Or if the cost will negate the increase in power. I have done this on engines in the past with satisfactory results. Also if I have the heads shaved, what would be the best amount of material to remove without having to worry about valve/ piston contact? Thanks for any help.

 

[toolmanmike]

I have a 1966 Dart GT w/ 273 c.i. engine. I am curious if milling the heads say "20,000 th or so will increase my compression ratio and power? Or if the cost will negate the increase in power. I have done this on engines in the past with satisfactory results. Also if I have the heads shaved, what would be the best amount of material to remove without having to worry about valve/ piston contact? Thanks for any help.

.020 won't get you much in compression or power. All it will get you is a intake that doesn't fit properly without machining and pushrods that are too long. Check them for straightness and take off a few thousands to clean them up if they need it.

 

[RedFish]

I remember back in the day when everyone wanted 340 X heads. They had to check closely before buying though. Some had be shaved and shaved again until shims under the rocker shafts were required.

 

[krazykuda]

.020 won't get you much in compression or power. All it will get you is a intake that doesn't fit properly without machining and pushrods that are too long. Check them for straightness and take off a few thousands to clean them up if they need it.

yeah, kinda like pissing in the ocean to raise the water level....