datzenmike Posted November 24, 2012 Report Share Posted November 24, 2012 Anyone? Quote Link to comment
MicroMachinery Posted November 24, 2012 Report Share Posted November 24, 2012 4 or 6 cylinder? Quote Link to comment
datzenmike Posted November 24, 2012 Author Report Share Posted November 24, 2012 sorry posted an oic of it. I imagine Doug may have a few ideas. Note the usual block drain is missing just above where the starter would be. Also look just above and to the left of the core plug near the dip stick.... see that raised round casting boss??? Here's a mid 70s L20B block. No 'bump' and has the water jacket drain plug to the left. I'm thinking the oil filter boss is different too. Should look like this... Quote Link to comment
DAT510 Posted November 24, 2012 Report Share Posted November 24, 2012 Carbed 6? Quote Link to comment
datzenmike Posted November 24, 2012 Author Report Share Posted November 24, 2012 No I posted a picture of the block back in the first post. I think I know what the round casting is for just don't want to restrict any ideas... Quote Link to comment
DAT510 Posted November 24, 2012 Report Share Posted November 24, 2012 Maybe a forklift engine or something? Quote Link to comment
DAT510 Posted November 24, 2012 Report Share Posted November 24, 2012 A big forklift... Quote Link to comment
datzenmike Posted November 24, 2012 Author Report Share Posted November 24, 2012 Here's a Z22 block. Notice the similar oil filter boss? Quote Link to comment
Laecaon Posted November 24, 2012 Report Share Posted November 24, 2012 is that a second set of engine mount holes to the left of the filter? Quote Link to comment
Farmer Joe Posted November 24, 2012 Report Share Posted November 24, 2012 looks like a z block, but has an L stamp.. its a factory mistake. its probably a Z20s block that got stamped with an L by accident. ?? Quote Link to comment
72240z Posted November 24, 2012 Report Share Posted November 24, 2012 Idk what the significant differences are but there were both 6 and 4 cylinder L20s's. The gloria used a 6 cylinder L20s for a while and I have seen people looking of I4 L20s's in the UK Maybe it has to do with the fuel its designed to run. The L20E is efi, the L20P is an LPG engine etc... Quote Link to comment
Sealik Posted November 24, 2012 Report Share Posted November 24, 2012 is that a second set of engine mount holes to the left of the filter? Correct.....one can use 510 or 720 mms...... to name a few Quote Link to comment
Sealik Posted November 24, 2012 Report Share Posted November 24, 2012 looks like a z block, but has an L stamp.. its a factory mistake. its probably a Z20s block that got stamped with an L by accident. ?? Look at the dipstick locale..... Quote Link to comment
datzenmike Posted November 24, 2012 Author Report Share Posted November 24, 2012 OK The L20 is a 6 cylinder engine from the mid 60s. It was only later stamped L20A to distinguish it from the 4 cylinder L20B. There were no L20 4 cylinders that I know of. Later 70s L20B block castings changed slightly because of their future intended use as Z20 (E and S and Z22 E and S) motors. This block has a raised boss just left and above the core plug by the dipstick for the outlet for the heater hose. On Z series motors the heater hose outlet is not on the heads. You can see it here... The oil filter boss is also more like the Z20/22. I just want to know why there is an S in L20S. Maybe it has to do with the fuel its designed to run. The L20E is efi, the L20P is an LPG engine etc... True but the B is only to show it's different from the A 6 cylinder. Nissan blocks are never stamped with E for fuel injection, S for carb or i for throttle body injection. BTW this block was supposedly made in the late 80s for South Africa. Quote Link to comment
motavated Posted November 24, 2012 Report Share Posted November 24, 2012 s for south africa? Quote Link to comment
datsunaholic Posted November 24, 2012 Report Share Posted November 24, 2012 Mismarked? The Nissan Laurel used both L20S and L20E engines, but they were 6-cyl. L20 (aka L20A) was a dual carb engine. L20E was EFI. L20S was single carb, as that's what "S" means. But it was a 6-cyl engine. Which makes me think it's just mismarked. All the L20B later-model engines I have look exactly like that, except for the "S". They say L20B ###### W. Quote Link to comment
Zeusimo Posted November 24, 2012 Report Share Posted November 24, 2012 S For Super Quote Link to comment
datsunfreak Posted November 24, 2012 Report Share Posted November 24, 2012 Nissan blocks are never stamped with E for fuel injection, S for carb or i for throttle body injection. I don't think this is true. I have three Z20s at the stop, two stamped Z20S once stamped Z20E? Quote Link to comment
datzenmike Posted November 25, 2012 Author Report Share Posted November 25, 2012 I don't think this is true. I have three Z20s at the stop, two stamped Z20S once stamped Z20E? Stamped right on the block? I had two Z20E engines the blocks were all stamped Z20 just to the rear of the #2 exhaust plug. It might BE a Z20 E or S but I've never seen them stamped thus. Quote Link to comment
datsunaholic Posted November 25, 2012 Report Share Posted November 25, 2012 I've seen them marked Z20 and Z20S. I've never seen a Z20E, but I've never HAD a Z20E. The one Z22 I had (a Z22E) simply had Z22 on it, as have all my Z24 engines. Quote Link to comment
HRH Posted November 25, 2012 Report Share Posted November 25, 2012 Z20E is fuel injection, Z20S is carbureted. Think 1980s 510s. E pistons are substantially different from S pistons in the cars. Truck, I think they're the same. E are flattops, S are big dish. E pistons from a '80 510 were what I had in my L20 in the 510. As for the L20S, I'd guess it was a mistake also, but certainly interesting. It doesn't look like the right letter, like it's smaller, so maybe a mistake or afterthought. Quote Link to comment
datzenmike Posted November 25, 2012 Author Report Share Posted November 25, 2012 It's not well centered like the others also. Quote Link to comment
datsunfreak Posted November 25, 2012 Report Share Posted November 25, 2012 Stamped right on the block? I had two Z20E engines the blocks were all stamped Z20 just to the rear of the #2 exhaust plug. It might BE a Z20 E or S but I've never seen them stamped thus. All three of mine are. :thumbup: Z20E is fuel injection, Z20S is carbureted. Think 1980s 510s. E pistons are substantially different from S pistons in the cars. Truck, I think they're the same. E are flattops, S are big dish. E pistons from a '80 510 were what I had in my L20 in the 510. FWIW, rods are also different. The Z20E has the longest rods of any L/Z series engine. And VERY short pistons. :blink: Quote Link to comment
ggzilla Posted November 25, 2012 Report Share Posted November 25, 2012 L20S -- the S means Single carburetor. T means Twin carburetor (example: L16T from the 510 SSS) Not sure about the block stamp. L20S generally means six-cylinder with Single carburetor Quote Link to comment
ggzilla Posted November 25, 2012 Report Share Posted November 25, 2012 That other block has cast number 06W -- which I think is 720. What's the mystery block casting number? Quote Link to comment
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