FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: GJCAT427 on October 11, 2018, 06:36:08 PM
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In building this new tunnel port project, I`m wanting opinions on using bronze guides in this thing. This is going to be a .600 lift OEM cam and matched valve springs. I used bronze in my 400 shop truck motor many yrs ago with out incident and wondered how you guys address the top end. Usage is street and strip
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If you run aftermarket stainless, you have to use phosphor-bronze as far as I know. I have only run stock cast iron guides with stock composition valves. Anything else get's new bronze stuff with Viton seals.
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You can run new valves with any guide. Cast iron guides and stainless valves need chromed stems.
However, it will be a benefit to you to switch to a bronze guide for a couple different reasons....
1. The new guides will be already sized correctly for a modern valve seal.
2. You can have your machinist cut the step off the heads so that you can use a modern valve spring locator that will locate off the valve guide boss.
3. You can switch to an 11/32" valve stem at the same time.
If the factory guides are worn, you're either gonna need liners or replace the guides.
If they're not worn, then I would at least have the guides and spring seats cut so you can run a nice Viton valve seal and a positive spring locator/cup.