Do bent valves == new valve guides?

[e30nut]

Gruppe:
Finally getting around to R&Ring my head. Broke the chain over a year ago. Totalled my current iC DD, so now pressed to fix the iS...on the cheap, of course.

I've got the head stripped down. About 1/3 of the valves were bent. Mostly exhaust. Several were really mashed. The valve guides 'seem' ok. I slid a straight valve in, no play in any of them that I can notice. Valves also move smoothly. Should I replace the guides just as a precaution? The head is practically new, not warped.

Have others R&R'd the cams w/o the special cam holder clamp-down tool? (11 3 260) There is risk of breaking the cams, right? I have 2 sets...do I feel lucky?

Also, I'm buying all new valves. AZAutohaus seems to have the best price on the Intervalve parts...anyone know of a better vendor? Time for a valve GB?

cheers!
John Grills
NCC-BMWCCA

[JoeDellio]

Ive mashed up a ton of valves on interference engines over the years, mostly turbo engines, some of which put the valve through the pistons and Ive never had a problem with guides being fucked up. The guides are a hell of a lot stronger than you think. Are you sure all the valves arent bent? Did you roll them across a table or something? Usually I find that only a couple are bent to the eye, and then when you roll them around you can tell big time, but if you used a straight valve to check the guides then maybe you got lucky.

It cant hurt to replace them, but then it just cost more money, and there are a lot of other things you could replace in the head just for the hell of it also. When you get your new valves just do the slide test like youve already done.

[e30nut]

Nah, I'm tossing ALL the valves and replacing with Intervalve parts (swiss company). I suspected the guides were quite durable, as the bottom lips had no visible damage.

Thanks for the advice!