Several have mentioned the probability of a sticking valve stem causing the bent pushrods. I wanted to mention that it may be more cost effective when rebuilding heads to simply buy a reconditioned set from Aerohead in Indy. They advertise in some of the Mopar magazines a price of $499 for a pair, outright, of either big block or 360 heads, with an additional charge of $80 for adding hardened exhaust seats. Last summer I decided to rebuild the heads on my 340 Cuda and took them to the local machine shop. These are the '72 and up style 340/360 heads, not X or J. They skimmed the surfaces, installed new .500 lift valve springs, hardened exhaust seats, ground the valves (I needed 1 exhaust valve and 2 intakes), new exhaust guides, and added new umbrella seals, the total cost was nearly $800. The Aerohead deal also includes new valve springs capable of over .500 lift, and the other things named. I wouldn't have to consider shipping since I live about 50 miles from their shop, but shipping should be around $150 to the furthest reaches of the lower 48 I would suspect, making a grand total of $730 or less. If one of your original heads has a crack anywhere, add $100 per crack for fixing them, that's what they charge in this area anyway. So it ends up looking pretty good. I haven't tried them myself yet, but I'm condering getting a set for my '65 Imperial, which really needs a valve job pretty soon. I might add the extra $100 to obtain 915 heads to retain the full compression ratio. Bill Parker, South Central Indiana '62 Plymouth Max Wedge; '64 Dart Convertible (Kathi's car); '65 Imperial; '65 Barracuda \6 (Kathi's other car);'68 Barracuda Fastback 340-S; '69 Barracuda Fastback now 360 (20 y.o. son's car); '72 Cuda 340