You can use a standard J4 head and associated components. I have done so. Albeit, mine does need a rebuild, but it was knackered before.
The plastic inlet is good for near on 300bhp, as tested (IIRC) by Wayne at chipwizards. I'm still using it. Obviously you'd need a suitable MAP sensor. I originally had a ported throttle body, but reverted back to the standard.
The JP4 head had milder cams but bigger valves, but unless that is your only option, I wouldn't bother.
You've not said what spec' etc the build will be, so these are just my opinions.
Don't make the same mistake I did. Use a decent head gasket, ARP head bolts and at least have the head checked and stem seals replaced, before going for it. My own naivety means I will have to re-do the above, next year.
Last edited by sri_130; 27th December 2018 at 10:13.
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