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Thanks to everyone who replied. I'll have the motor out this week and will let you know what I find. Bovman

Broke two rocker arms on my 1973 Dart Sport 340 bracket car. Pulled the heads and replaced the valve springs, hyd lifters, rocker arms. Went out and it wouldn't rev past 5200 rpm. I replaced the orange spark box with a chrome one and went out last night. Better, but still won't rev past 5500...

For $500 How much cam could I put in it without the valves hitting the pistons? Any ideas how to get some horsepower out of this without hurting the reliability or increasing the maintence? I'm a Chevy guy, like the Mopars but don't really know a dam thing about the possible engine combos...

Where can I read up on this?

What can a vacumn gauge tell you?

I did replace all of the valve springs when I repaired it the first time. I also checked to make sure that none of the valves were bent. I'm pretty sure the lifters are the problem. I ran the old valve springs a little to long but the inside of that engine looks like new, I checked everything...

You may have hit it on the head. It never occured to me that the lifters could be bad after that incident. I knew the problem had to be related to those broken rocker arms. I'll order replacements today. Thanks for your input.

Holly blue pump. pressure a steady 6.5 lbs throughtout the run. Modified Thermoquad carb.

I race a 1973 Dodge Dart Sport with a low compression 340. This engine has performed really well over the past ten years but recently I had a problem. At the end of a run the engine began to stutter and upon inspection in the pits it was revealed that two pushrods had broken through the rocker...