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Title: 40 HP exaust valve question Post by: danny gabbard on October 05, 2009, 00:19:33 am I'm building a hopeful long lasting stock motor. Well the question is, I got heads apart and going to lap valves. The intakes look good. Would, or should I replace exaust valves or just lap them in also. They look good with no hot spots or burn spots. Do exaust valves go bad or get brittle from the heat.
Title: Re: 40 HP exaust valve question Post by: kingsburgphil on October 05, 2009, 04:49:44 am Way back when, the shops that I worked at we always replaced EX valves at overhaul time. It was cheaper and faster than gambling on an unknown quantity.
Title: Re: 40 HP exaust valve question Post by: TexasTom on October 05, 2009, 05:10:26 am X2 ... replace them, they're cheap insurance! ;)
Title: Re: 40 HP exaust valve question Post by: danny gabbard on October 05, 2009, 05:43:11 am Thats what I thought, Now is there any that are better than the other? Like ATE or ? And get from who? I've never did a 40 HP motor before. And thanks guys
Title: Re: 40 HP exaust valve question Post by: Fastbrit on October 05, 2009, 08:14:09 am The original factory 40hp exhaust valves were two-piece, with the heads friction-welded to the stem. In Europe especially, they had a reputation for dropping #3 exhaust valve due to the oil cooler blocking airflow to that cylinder, allowing it to run hot. It was generally reckoned that exhaust valves were ripe for replacement at anything from 60,000 miles – we used to fit stainless valves as a matter of course in every stock engine that got rebuilt. No more dropped exhaust valves after that.
Title: Re: 40 HP exaust valve question Post by: danny gabbard on October 05, 2009, 15:27:09 pm Great Idea keith, Thanks
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