JP4 Heads are 1.4 / 1.6 all the same valve sizing?

[roosie]

I know the J4 head has smaller valves than the JP4.

I have heard different responses regarding JP4 heads.


ie are all the C2/206/307 JP4 heads valves sizes the same?

im not really interested in cams/inlet etc i just want the best bear head for valves. someone said only the c2 VTR and VTS have the better flow head.

[PirataSport]

I don't exactly remember, but I think the bigger ones come in the C2 VTs and in the 206 XS 1.6 16v, but I don't know about the ones in the Xsara, 306, etc..

[welshpug]

there isn't a 1.4 16v TU.

valves are all the same, head casting is the same.

JP4S originally had uprated springs over the JP4, however if you need a replacement spring for a JP4 you'll be supplied the S springs now.


its the cams and inlet manifold that make the main difference in the 125 bhp engine over all the 110's.

[Chipwizards]

One teeny weeny difference is with the oil galleries, some (earlier ones it seems) have screw-in gallery plugs so you take them out and clean the galleries but others have steel balls pressed in which stay put.

If you're looking to build a head, it's good to know it's galleries are clean.