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View Full Version : D16y1 head VS D16Y4 head.


creativepunka
05-07-2007, 06:18 PM
Hey does anyone know if the y1 and y4 have the same size ports for inlet and exhaust? Do they have the same size valves?? cheers
EG5[KRT]
05-07-2007, 11:49 PM
the ports are the same size but the valves are different i think.
creativepunka
06-07-2007, 05:47 PM
does anyone know 100%. Valve sizes would be good./
ingram
07-07-2007, 09:09 AM
Im 100% sure the valves are the same sizes.
creativepunka
07-07-2007, 11:32 PM
champion.
Muzz
30-07-2007, 07:45 PM
;1244563']the ports are the same size but the valves are different i think.

Can anyone else confirm or deny if ports are the same, very keen to know:thumbsup:
If so, then the only benifit the vtec d series heads flow wise would all be in the camshaft profiles. yes/no??
creativepunka
14-10-2007, 09:48 PM
found out the valves are the same but the y4 ports are much smaller.