Astra Si Head

[Anonymous]

I'm puttin an Astra 1.4 Si Head on my 1.4SR cos of the bigger valves,chambers and no swirls etc..

Anybody done it??
Can u tell me about power gains?

Anything appreciated.
Cheers in advance.
;-)

[Anonymous]

Yes, I gained about 30bhp but i went from a standard sr head to a ported Si head.
The only problem is the chambers are significantly bigger, we had to skim 3mm off to get the compression ratio we wanted and that left the cam belt too long, there wasn't enough adjustment for the cam belt so we needed a shorter one, Hours of fun...