Pretty much what the title says, can the AU 4litre bore out to 60 thou, which would pretty much give it dead on 250 cubic inches.   Is it worth the effort going for 60 thou, I know crossflows and a lot of other sixes have no issues with a 60 thou overbore and it gives about 6 extra cubes on a 6, but is overboring the block really worth the effort?   Also does anybody have any recommendations for piston brands these days. Normally I would of just picked up some ACL's but seeing as they dont do that stuff anymore, what's the next best thing?

Hello again everyone.    I'm back with another question about my XC.    I want to refresh the air cleaner and give it a new coat of paint, but I'm not sure what the actual colour is?    Would it have a code at all, and how could I find it?    Any help would be greatly appreciated.    Thank you.    (By the way, the photo I've included is NOT my air cleaner. Just a photo taken from the internet as an example.) 😁

I think I will try to find a second hand ECU. EB-ED 4.0 auto with 3.23 diff is the same part number, so pretty much any EB-ED 4.0 auto ECU will run it. If that solves the issue, I can then try to find the 100% correct ECU.

Hey thanks Bear,spoke to another engine builder today,nothing really wrong with 351c I'm running at present with 10.5.1 compression.  Think I'll just try snap out of it & keep the 30k in the pocket.  Half the problem each engine builder puts a different take on things, doesn't really listen to the customer needs or take in my notes & nek minute budget blow out going north to 40

Quite an involved calculation, 65cc + 13cc (dish) +0.040" for a head gasket etc, etc. Have used WallaceRacing calcs before, gets pretty close.    http://www.wallaceracing.com/cr_test2.php

Possibly a faulty wiring join, or an ECU circuit board problem? If not fixable yourself, Injectronics repair faulty ECU's

Gday all   My XG starts and runs well cold, then as it warms, it develops a miss.   By unplugging injectors to test, it seems to be missing on 2, 4, and 6. This corresponds with Bank 2 injectors    Any ideas of how to test?   To me it sounds like I need a replacement ECU.

Facebook sux,compression calculator just as bad....   Latest & greatest from Andy across the ditch, drum roll please 🥢    650hp 408 Cleveland build, yes you heard that correct or should I say read correct.    Facts gathered to date Aeroflow 4.000" block immediately available or 4.125" block wait until December.   Bore 4030 H beam rods 6.000.   Screw all that just straight to the nitty gritty,  Compression target perhaps 10.5.1 to 11.1 prepared to use 98/100 octane.  Heads are going to be CHI 225 ither 60cc or 67cc planed down to 65cc. Some suggestions point towards 65cc would give me 11.1 Compression using a -13cc dish piston & zero deck.  Ultimate goal being 650hp.  Some other trivial factor inners, CHI 7.2 single plane intake, forged Scat stroker kit ,242/250 solid roller cam...   10 million $ question is correct negative CC Dish piston?   What sayeth thee...   Forgive all the dribble it's been an exhausting off & on 3 days. Really just trying to seek a simple answer to a complicated equation 

I have been considering that a reco box is what might be needed already some time ago...I found the below thread, which gave me the incentive to just pull it out and see if it is simply able to be adjusted or needs repairing if even at all possible, as I assume some boxes are too far gone in some way. I have never had any experience with disassembly and repair of these before.    This thread below, also made me consider having a go at doing it myself, but one thing in  particular that I will pay for, is getting diff's done when changing ratios. I have been looking for  places to get a reco steering box from and only one didn't require a changeover box... Just weighing up the options, like, I have no idea what to look for as far as what parts are good or not, if I have ago myself... or If I pay up for a good as new reco one, then at least I have warranty if there is a problem... And I no offer myself warranty on this undertaking...🤫 Jury is out as to which way I will go, but have several other priorities also!        

Seal kit and DIY, is what I'd do... Even purchasing tools, would likely end up cheaper