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There just could be an easier option just fkn order the 8/71 dyers blower drive kit from america cause it will be low comp without touching anything ,and put that scott inj hat on it,wait where is my credit card.

1st thing is just get the block cleaned and make sure its not cracked ,olm8 reckons its pretty good from just a first look,but no rush ,i gave him the old cam to dummy fit to make sure the cam bearings are right,but i have total faith in him,he has done all my engines.

Yep, do the math. Easiest way is to chuck it together with crank, liberally lubed bearings and a piston, then measure the height to the deck surface when at TDC for that cylinder. Then measure the deck height for that piston. Then compare it to the one you are looking at. Now calculate the rest and you're good. If you don't have a calculator for it I'd highly recommend an app called 'Virtual Dyno', the icon is a black-faced tach with a yellow bar at the bottom. Its about $1 but works nicely. Its modelled off the desktop 'Dyno 2000' with a few tweaks by the creator to get it closer to real-world results. If you don't want to do that just PM me and I'll have a shot for you. - boingk

302 heads sound the goods, but beware of what the comp height is, plus gasket thickness, dish and head cc. Make sure you do your homework, especially with a torque cam that has big cylinder pressure in the midrange. If the piston top is anything more than 10 below deck, consider it open chamber and reduce target compression accordingly. Sent from my CPH1903 using Tapatalk

As far as I recall, the XD became the first "Metric" blocks, (5.8 instead of 351), and they changed to electronic ignition, and used a metric diameter dizzy. Not much else changed inside though, all the journals were still Imperial, I reckon. typical Clevo issue, cracked manifolds......Custom headers are gonna be expensive, maybe find yourself a good welding company. Can be fixed, but needs some experience.

Also, if you're looking at pistons... you know the 351C is almost identical, right? The 400 has a 0.9753 pin and the 351C has a 0.912" pin. You could get the rod bushed, or have the piston reamed to the right size. May end up cheaper than a crazy bespoke set - ask your machinist. Like this thing: https://www.ebay.com.au/itm/SPEED-PRO-020-FLAT-TOP-HYPEREUTECTIC-PISTONS-SPH555CP-020-SUIT-FORD-351C-V8/162024943750?epid=868136172&hash=item25b9707086:g:xA0AAOSwbeBdVfhV:sc:AU_StarTrackExpress!2880!AU!-1&frcectupt=true The comp height is 1.645 as well, which would help. Most of the cheaper ones for the 400 seem to have a 1.630 height. - boingk

From experience, go the lowest overbore you can. You never know what you'll run into, and if there's a core shift or thin wall, or even a casting defect you'll be better off the less material you remove. If the bore is 7-ish over and the pistons 1 under you'll get 4 thou wall clearance. Sure, its not ideal, but you could easily do a light hone and chuck it back together with new rings and bearings. If you want to keep it I'd see if they do a 20 over piston. If thats an option see what they do in the basic rebuilders specials and go from there. Like you said before, even if they have a dish on them we have the luxury of the magic 302C head to help boost compression.

Sorry just re-read your post, it's not 040 off the bore, it's off the deck. You can calculate the resulting CCs from removing 0.040 from the deck on a 4" bore. Convert to CCs from cubic inches, then subtract that from your total combustion volume. Sent from my CPH1903 using Tapatalk

I dunno about 400s, but Clevos can't go over 0.030 on the bore, maybe better research that one as well, maybe get your machinist to sonic test? Sent from my CPH1903 using Tapatalk

I reckon get your pistons, dummy them up without rings, check deck clearance and see if the deck needs skimming. It will involve multiple trips to the machine shop (or just getting them to do it all while it's there) but if you go zero deck you may well be in the danger zone with compression on a 58cc chamber, depending on the dish of those new pistons you mentioned. You can get in the ballpark if you already know the deck height of the pistons by calculating. Sent from my CPH1903 using Tapatalk

ok olm8 checked the pistons and they are 1 thou under,and the block is 7 thou ware,so in his opinion we need to buy new pistons grrrrrrrr,so i will start the hunt for some 030 from america ,they are cheap as shit with a ring kit,but will have the larger dish so either put some 302 heads on it or mill the original ones ,its only gunna be a mild stocker and i cant see spending 800 bux on a set of tmeyer ones,maybe if i keep hunting on american e bay i might be able to find some old oversize factory pistons maybe so thats the update.

The ports just look like standard 2Vs to me, nothing different. They are still a big port for a smallblock. Probably spot on for this application Sent from my CPH1903 using Tapatalk