guides are the same.
yes mine has a greater inlet duration, less exhaust,
Robert Cox heads look alright as far as shiny ported heads go but because heads are so very different performance wise who knows what will be good, not all views are positive. There is a lot of opinion over hand ported vs CNC which affects many buying decisions, personally the best heads I've used have been hand ported and finished, but I haven't used loads of different heads so again it's another opinion. Slark cylinder head preparation or Bryan Slark Racing have done all my classic Mini heads, and Tritec heads I have are Lohen, Allstage, Cosworth, JCW, the current one being Allstage, otherwise known on here as Shed. As I've said before it isn't all in the head, and other people's views come into play making it a hornets nest overall with few sound solutions perhaps.
The current head with stock inlet size and bigger exhaust made 230whp @7.2k with my cam and 233whp @ 7.6k with the 1302469 Catcam, and 234whp @ 8.16k with the Newman PH3/4, when my cam was run up I didn't have this custom Maniflow manifold so the cam is back in waiting to be run up again, I'm expecting could be 235whp+ but overall the Allstage head works very well. On its own responsible for a 14whp gain with my cam. I'm only interested to see if it recovers the ~2hp loss to the 469 in the upper midrange which I suspect it had due to the manifold maybe but we'll see.
A thing with heads is also that you can have several from the same place and one stand out which fuels an argument for CNC, but the counter argument might be that castings differ, meaning CNC can have the same or similar variances in performance, additionally a taping service if offered for a CNC head is hand finishing anyway, so back to the hand ported head at least for me. Cosworth heads there is a fair amount of negative feedback for especially in the US as it was Cosworth USA that did them, and the view is they don't make that much, but a lot of this is about the combination I think, definitely I would say having experience of the affects this can produce, there is no rule to get this right especially with a head produced to a spec you have to find a cam for, really the cam and usage would be better given to the head prep company so they can tailor the head and valves or springs and valve geometry etc. Again, only my view fwiw.
the JCW head above will be added to 'fitted only' parts I occasionally sell, just like the Lohen BVH,
I did message mod a mini about providing some flow numbers for comparison against other heads but as yet no reply. Tbh I'd be more interested in the torque curves and when they started to drop than a +/- 2bhp, I'll have to have a re read of the cylinder head thread later today.
Not heard of the Slark name in years! Ex Downton man.
I've seen that with some tuning companies, CNC heads blah, blah then you read a bit more and they're all hand finished anyways. ?
How come you went that way with your EW02 profile? With the campfire banter saying that the exhaust is the restrictive side surely the greater gain would be for more exhaust duration? Or would that have knock on effects with scavenge and exhaust gas drawback?