03-05-2013, 10:37 PM
the 1.8 head is very restrictive. I ported my one during my rebuild and in places i took off about 8mm either side in the inlet ports and i didnt go too drastic with it!
Bang the GTi head on there and that should be a winning combo. The head already flows very well with them big oversize valves. Couple that with the short stroke bottom end and it should build a winner. Dont bother with the xsi head though. It doesnt flow as well unless you want to put time into making it flow but theres no point when you can just go and buy a gti head.
The valves in the gti head are huge. Dont think ive seen an engine where the valves are so tightly crammed into the bore. Thats why all the 6 forum lot moan about them being difficult to time. On the 1,8 head, there is loads of room for error. None on the gti head!
Bang the GTi head on there and that should be a winning combo. The head already flows very well with them big oversize valves. Couple that with the short stroke bottom end and it should build a winner. Dont bother with the xsi head though. It doesnt flow as well unless you want to put time into making it flow but theres no point when you can just go and buy a gti head.
The valves in the gti head are huge. Dont think ive seen an engine where the valves are so tightly crammed into the bore. Thats why all the 6 forum lot moan about them being difficult to time. On the 1,8 head, there is loads of room for error. None on the gti head!
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft