Distraction240z

I have read that post and a few others and i am split between working on my L24 or going out a buying a L28 and modifying that. I really want to retain the stock look with the SU carbs. If i can find a L28 for a reasonable price I want to build the long rod bottom end that I can then build off of down the road. This year i want to build the bottom end and get it in the car running and on a dyno with my cleaned up SU carbs and a head that i port myself. If i get to 200hp then i have achieved success on my own. If i get 150hp i will be happy, but after a year or two send the carbs to Z therapy, or send the head out to get rebuild, new cam, port and polish. Right now i am looking for advice / info to build the bottom end. 1) Does anyone have experience running XR500 pistons or FJ20 Rods, what did they do and how did they do it? 2) Do i need to cut valve reliefs in the piston or will turning them down to 28.5mm compression height work? 3) Is the top land thick enough for this, or go with a thicker head gasket? 4) Will the standard XR500 piston rings work? 5) Is it really that hard to bore out the F54 block to 89mm and still have a cylinder wall thickness of 3mm (0.120")? 6) Is it hard to remove 0.25mm from each side of the small end of the con rod to make them fit into the XR500 Pistons? These are the pistons and rods i want to purchase. https://www.cmsnl.com/honda-xl500s-1980-a-usa_model1145/piston-kit-std-non_06131429003p/ https://www.maxpeedingrods.com/product/steel-engine-connecting-rods-conrods-for-nissan-fj20-21mm-pin.html?search=fj20 The car currently has the Subaru STI R180 Diff with CV joints, 1983 280ZX turbo Trans, a 123 ignition distributer, a lumpy cam in the E88 head of unknown specs. I did all of this over the year by myself even though I have mostly stuck to small engines like dirt bikes, snowmobiles, and am looking for a new challenge. I also need to install new engine mounts as I have a tone of rear wheal hop, any recommendation?

Hello everyone I have a 1971 240z that is pretty original, the engine is getting tired and I am looking to rebuild a L28E form a 1983 280zx that I have found locally for $1500 Canadian. I am looking for your opinion on the simplest rebuild with the most bang for my buck that will. 1) Run on 87 octane fuel. 2) Still use my original SU Carb. 3) Be easy and reliable, not looking for big power anything over 150 at the wheels is great. 4) Cost no more than $6000 of my Canadian pebbles. I think the safe option for a slightly better rebuild than stock will be the use of the Z22S Pistons and L24 Con Rod. The compression height of the Z22S pistons is 35.5mm with a bore of 88mm. The Datsun L series engine have a block deck height of 207.85mm. Or Nissan FJ20 140mm Connecting rods, and Xr500 89mm pistons. About 1500$ for connecting rods, pistons, rings, everything but bearings. From my research there are two small problems. An extra 1.25mm in deck height (209=(79/2)+29.5+140) and the small end width of the Honda piston 20mm vs the 20.5mm of the FJ20 con rod. I think I can solve the piston issue with a thicker head gasket or taking some material off of the top of the pistons, which one is better? I also don’t think it would be a big problem to remove 0.5mm from the con rod small end width to fit the Honda Piston. If you haven’t guessed I want to run FJ20 Con rods and XR500 pistons, but am concerned with over boring to 89mm. If you have some old school fixes, tips, advice or if my information is wrong, please share with the class. measurements are mm FJ20 Con Rod L24 Con Rod Datsun Spirit Con Rod Center to Center 140 133 139.5 Big End Dia 53 53 53 Small End Dia 21 or 22 21 21 Big End Width 26.8 26.8 26.8 Small End Width 20.5 23.9 23.9 Price USD Per Cylinder EST 58.17 111.33 204.17 XL500 Z22S Datsun Spirit Piston Bore 89 88 89 Compression Height 29.5 35.5 29 Wrist Pin Dia 21 21 21 Small End Width 20 Standard Standard L24 Piston Height 66 Price USD Per Cylinder EST 80.45 100 237.5 Rod to Stroke Ratio 1.772151899 1.683544304 1.765822785 Compression Height 209 208 208 Price Per Cylinder EST 138.62 211.33 441.67