Larger valve question

Tin-Knocker105

Registered User
I have my heads in the shop and would like to put bigger valves in them. Especially the exhaust side. the shop told me i would have to have new seats installed for bigger valves in the exhaust side. Anyway what information i need is what valves can we use in these heads. I saw that COY was using XH426's & NK842's, but which ones will fit in our heads, meaning length etc. I did a search for heads and there's some talk of chevy valves being close to our length, but can someone give me more information.

thanks
tony
tinner105@socal.rr.com
 
You can run a larger valve on the stock seats. In fact larger seats don't help the flow situation any. Don't ask me how I know this. Anyway, a larger valve head will sit the valve higher up on the seats improving low lift performance and effectively increasing duration. As for what sizes? Sorry, can't help ya.:eek:
 
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