Yes the large aluminium backplate is for a pipercross filter, trumpets fit inside just nicley. and yes i have another pic of the engine without head showing the ARP stud kit but in that photo you can see the davies craig water pump.

OK dyno result back, this setup gets only 1 hp more at top end compared with my old TPS setup. up to 105hp(wheels) corrected power at 7600rpm but between 3500-5500rpm it has lost 20% torque and 10% hp. me thinks that it is just to big (43mm). So i am after some webber chokes 32/34/36mm to try and get some power back if you have some to sell please let me know.

cool pic! I can't believe you will take it on dirt and get it all dirty, it's just too pretty for that man!

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I will be very interested to see if you can get your midrange torque back to the same figures as the old TPI set up. I dont think you will but would like to be proved wrong.
I have seen this tried once before on a Z motor with single TB set up, once changed to multi TB's with the right choke size and many dollars spent, he lost 14% midrange and only had a 4 Kw increase at peak power.
Good luck with the developments and keep us posted. I like the quality of your work.

43mm is pretty big, that's about what the fj24 used to run on carbs...

im currently running 50mm holes on a 2100 twincam, andthey're too big..

Looks great. The trumpets look trick.

Just curious. Everytime you set the tappets do you have to take off the strut brace?