Just some info for you hard core city modders...
just had a mate who is a head rebuilder figure out that some valves out of a turbo diahatsu (spl) of some kind will almost bolt into and provide much better exhaust valves (with boring and porting the port).
can be some good gains for some of the more worked t1s out there i think!
I dont have the exact model of the valves but little work would be required to make them fit, and they were cheap
The standard exhaust port/valve is tiny and pretty sad, so something bigger would be a good start!!
t1 Valves (exhaust)
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