You guys have got to be bored of my posts by now about valve train
BUT
I wanted to get the supertech valves oversized .5mm or 1mm but when I brought this up to the guy I was going to buy them from he told me i was giong to have problems...Do you see any problems if i have the machine shop machine the head to accept them?
Thanks
Nick

 

^

 

if your gonna spend the money to do that then get the 1mm over. but anyone will tell you when under boost, you have a greater chance of your valve going through your valve seat.

 

its the same price reguardless; id just have to pay the machine shop to do it...i guess ill stay stock size; im only going to run about 11psi....
thanks tgh!

 

its a lot of work to do right, I would suggest new valve seat , guides and seals, then the big problem is usually valve installed height! do the supertech's have the 3 angle already cut into the back of them?

 

yeah i got the supertechs; valves, retainers, and valve springs; i just thought if its the same price why not get the bigger ones and my head is at the machine shop so i could just tell them while its there....sounds like problems ill just stick to stock y0; thanks guys

 

new valve seats are a handful under boost. when i got my p&p i went with .5mm over but only because the guy made me a deal to do the machine work for the valves for a very good price and im staying with .5mm over.

 

I'm also running 0.5mm oversized valves, mainly because Ferrea sent me the oversized vavles instead of the oem spec size. I did not realize it until they were sent across the country with the cylinder head.
No problems, my cyl head porter commented that the "mistake" would complement the cyl head work I was getting done anyways.

I don't think oem size would have been much different though.

 

Well in a book I read it put it this way. It said to think of the valve as a door on a windy day. When you open the door that is your "lift" and the longer you keep the door open that is your duration. Now if you have a valve that is "x"mm do you think .5mm is really gonna be that much more beneficial? Answer that and you got your answer. Just a thought.

 

personally i dont think its worth the money on a four cylinder

 

My personal opinion is that on most honda heads, bigger cams are more beneficial.