I was wondering if any of you guys know alot about valvetrain and willing to give so idea. Im building a gsr turbo and need some help on the head. im debating on going with supertech and crower. witch one do you guys prefer and why. anything helps. Thanks.

 

Both good companys. I rock the Supertech valvetrain.

 

supertech is good but sometimes known to break. although i think people are doing something wrong if so. .. skunk2 has always been on top of the game. not to sure about crower. dont read much news about them.

 

skunk 2, crower are two good choices

 

we do supertech valve springs other than that most the heads from the guys that do my work are stock.

 

REV and ferrea (spelling) only two I'd use.

 

i think my guys in kc told me oem is good to around 750hp

 

The only reason I would change from OEM is to rev higher or planing to pump out some major hp (like 600+).

 

im actually over 600 now on a pretty stock head at 10k rpms I had a bad experience with some springs thats the only reason i went with the supertech springs

 

Thanks everyone. whats a good size for the valves?

 

is 400hp ok with stock gsr valve springs?

 

Stock size valves, dont go oversized. the springs are dependant on what cams are top be run in the head. if you sticking stick stock gsr cams then there is no need to touch the springs as stock redline would be fine. really also depends what the purpose of this car is and what size turbo being ran etc.

you cant go wrong with a set of supertechs or crowers or skunk2 with the retainers as well. also if having it apart bronze valve guides are a VERY good idea. If you bend a valve and have bronze guides it saves a motor. stock guide crack and break apart when you bend valves and take out everything in their path. ie turbo pistons cyilinder walls head

 

holy ****,lol, thanks man, that helps a lot. im planing to get everything new for the head. so stock valve size should be ok?

 

yes stock valve size is the way to go especially when running aftermarket cams. valve overlap becomes an issue with radical cams and oversized valves. and stock size flow more than enough.

 

How much do you think i can get with after market valves stock size? thanks.

 

i dont knwo the setup but im pretty sure the big guys are running stock sizes for the most part and makeing 800+whp

 

whats the different between dish and flat valves and witch one is best? thanks.

 

U could make 800 hp on stock valves, it's not like the aftermarket is using some awesome new material in the valves, most just use a coating on ss. U really change valves to decrease the weight, but all honda valves r good with handling the heat. The dished valves will make the area in the combustion chamber more (lowering compression) depending on the size of the dish and the flat valves will decrease the area in the cc (increase compression).

 

Thanks. what kind of valves in gsr, flat or dish? this is going to be my first build so sorry about all the questions.

 

That depends on what ur ideal compression ur wanting it b. U can fine tune ur CR with flat or dished valves. U have to design ur engine so that the parts all work to fit ur ideal HP. It's not really as simple as flat or dished, but if ur just going to slap something together then stick with the stock dish.