What's considered a large valve GY6 head?

[mnm99]

Head is out of a 2006 carter talon. The intake valve measures 1 3/16. converted to MM = 30.1625 mm. Wondering if it's worth porting.

[xlint89]

http://www.scrappydogscooters.com/12...rformance.html

http://www.mbe-motorsports.com/catal...roducts_id/280

[mnm99]

Originally Posted by xlint89

http://www.scrappydogscooters.com/12...rformance.html

http://www.mbe-motorsports.com/catal...roducts_id/280

Uh..? thanks, but that really doesn't help with my question.

[xlint89]

You asked what's considered a large valve head?

http://www.scrappydogscooters.com/12...rformance.html

30mm intake and 25mm exhaust. Those are considered BIG valves for a 2 valve head. (actually larger than most "big valve" heads)


http://www.scrappydogscooters.com/12...rformance.html

23mm intake and 22mm exhaust are considered BIG valves for a 4 valve head. Considering the "other" 4 valve heads use 21mm intake and 19mm exhaust.

I think it answered your Q quite well.....

[sleepyrz]

bringing this up from the past sorry if it offends anyones sensibilities

i saw somewhere that the howhit gy6 in the yerfdog had a "large valve" head already

is there any truth to this??

mine is a 2003 if that matters

[sleepyrz]

guess maybe ill make a new post just about this?