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#1
12-29-2017, 04:41 PM
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Valves for -67 670 heads?
Hi!
I’m about to restore my 670 heads for my -67 GP with 400 engine. I will order some new valves from Summit but I have some thoughts... Stock or stainless? Seames to be some different ones to choose from at Summit. What are your experience and what do you recommend? |
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#2
02-09-2018, 11:01 AM
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Don't know if you ever got the heads redone yet, but I would go with stainless on the exhaust ports because those get hot from the exhaust exiting the head.
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#3
02-09-2018, 11:04 AM
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Most recommend the Ferrea stainless 5000 series.
They're available from Butler, Ebay & lots of other places. https://butlerperformance.com/c-1400...ce-valves.html https://www.ebay.com/itm/Ferrea-Stai...!US!-1&vxp=mtr SI also sells stainless valves. They have the hi perf type, with no O-ring groove, and the stock type, which does have the O-ring groove. According to the SI rep I talked to, the stock type exhaust valves are stainless, but the intakes are not. But, he assured me that all SI valves are 1-piece. Can't verify. Just passing on the info I was given. A once highly esteemed Pontiac engine builder used & recommended SI valves, FWIW. http://www.sivalves.com/ http://sivalves.com/flipbook/2016-SI-Catalog.html#p=43 I assume that the engine builders here can verify which valves they think are good quality & some that are not. Last edited by ponyakr; 02-09-2018 at 11:33 AM. |
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