1971 521

[wayno]

There is a big differance between these engines, the L20b block I recently put in my work truck before my hybrid engine install, sat for 3 or 4 years without a head, it was a lower mileage engine, I put a fresh rebuilt head on it, and it started right up and ran great, no smoke, or oil burning, but it wasn't powerful enough for what I am using it for, so I built a LZ23 and installed that, it is a great engine. The L16 would not keep my truck/trailer combo moving the speed limit on 205, the L20b(with stock head) would do the speed limit except on gradual hills, L20b with modified head(basicly a 219) would basicly do the speed limit even on the gradual hills floored, and the LZ23 will get me tickets if I don't keep my foot out of it.

[jon521]

There is a big differance between these engines, the L20b block I recently put in my work truck before my hybrid engine install, sat for 3 or 4 years without a head, it was a lower mileage engine, I put a fresh rebuilt head on it, and it started right up and ran great, no smoke, or oil burning, but it wasn't powerful enough for what I am using it for, so I built a LZ23 and installed that, it is a great engine. The L16 would not keep my truck/trailer combo moving the speed limit on 205, the L20b(with stock head) would do the speed limit except on gradual hills, L20b with modified head(basicly a 219) would basicly do the speed limit even on the gradual hills floored, and the LZ23 will get me tickets if I don't keep my foot out of it.

 

 

i see. ya im not doing much hauling, sometimes my brothers motorcyles. but i use it as my daily, and it would be nice have something with a bit more power, especialy with all the hondas (:sick:) here

 

do you think the valve seals could have gone bad? dont they get brittle if the engine sits for awhile?

[izzo]

hahaha. yes they get brittle when sat for a while. crack, dried up.. then they don't seal well. you can replace them without removing the head... there's a few guides on here how to.

[jon521]

so if i bought this engine, i could do the valve seals before i even put the engine in, could i use the seals i bought for my l16, or would i have to get a new ones?

[izzo]

pretty sure those little rubber seals work on all the L series engines, maybe even others..

 

Edit -

 

Those valve stem seals will work on the following applications -

 

CHEVROLET CHEVETTE (1983 - 1985)

CHEVROLET CHEVETTE CS (1984 - 1986)

CHEVROLET LUV PICKUP (1972 - 1982)

CHEVROLET S10 BLAZER (1983 - 1984)

CHEVROLET S10 PICKUP (1982 - 1985)

GMC S15 JIMMY (1983 - 1984)

GMC S15 PICKUP (1982 - 1985)

HONDA PASSPORT DX (1994 - 1996)

INFINITI M30 (1990 - 1992)

INFINITI Q45 (1990 - 1996)

INFINITI QX4 (1997 - 2000)

ISUZU AMIGO (1989 - 1994)

ISUZU I-MARK (1981 - 1985)

ISUZU I-MARK DLX (1984 - 1985)

ISUZU IMPULSE (1983 - 1989)

ISUZU PICKUP (1981 - 1995)

ISUZU PICKUP 1 TON (1988 - 1992)

ISUZU PICKUP NORMAL CAB 1990

ISUZU RODEO (1991 - 1997)

ISUZU TROOPER (1984 - 1991)

MERCURY VILLAGER (1993 - 1998)

NISSAN 200SX (1977 - 1988)

NISSAN 240SX (1989 - 1990)

NISSAN 240SX SE (1989 - 1990)

NISSAN 240Z (1970 - 1973)

NISSAN 260Z 1974

NISSAN 260Z 2+2 1974

NISSAN 280Z (1975 - 1978)

NISSAN 280Z 2+2 (1975 - 1978)

NISSAN 280ZX (1979 - 1983)

NISSAN 280ZX 2+2 (1979 - 1983)

NISSAN 280ZX 2+2 GL 1981

NISSAN 300ZX (1984 - 1989)

NISSAN 300ZX 2+2 (1984 - 1989)

NISSAN 510 (1968 - 1981)

NISSAN 521 PICKUP (1970 - 1972)

NISSAN 610 (1973 - 1976)

NISSAN 620 PICKUP (1972 - 1979)

NISSAN 710 (1974 - 1977)

NISSAN 720 PICKUP (1980 - 1986)

NISSAN 810 (1977 - 1981)

NISSAN AXXESS (1990 - 1995)

NISSAN AXXESS 4X4 (1991 - 1994)

NISSAN D21 PICKUP (1986 - 1994)

NISSAN D21 PICKUP SE (1991 - 1994)

NISSAN D21 PICKUP XE 1994

NISSAN FRONTIER (1999 - 2000)

NISSAN MAXIMA (1982 - 1991)

NISSAN MAXIMA GXE (1992 - 1994)

NISSAN MAXIMA SL 1981

NISSAN PATHFINDER (1987 - 2000)

NISSAN PATHFINDER LE (1994 - 1997)

NISSAN PATHFINDER SE (1990 - 1997)

NISSAN PATHFINDER XE (1990 - 1997)

NISSAN PICKUP (1995 - 1997)

NISSAN PICKUP KING CAB XE-V6 1996

NISSAN PICKUP SE (1995 - 1997)

NISSAN PICKUP SHORT BED XE (1995 - 1997)

NISSAN PICKUP XE (1995 - 1997)

NISSAN QUEST (1999 - 2000)

NISSAN QUEST GXE (1993 - 1998)

NISSAN QUEST XE (1993 - 1998)

NISSAN STANZA (1990 - 1992)

NISSAN VAN (1987 - 1988)

NISSAN XTERRA 2000

PONTIAC ACADIAN (1983 - 1986)

PONTIAC ACADIAN S 1986

[jon521]

holy shit izzo! haha thank you! maybe i will buy the engine then, slap some valve seals in it, and put in the the 521! :)

 

 

 

 

 

 

if it were only as easy as "slapping" them in though.... also i only work 2 hour shifts 5 days a week so i dont make a whole lotta money...but the seller wants to give it to me for a good price.

 

more opinions welcome :D

[wayno]

I think he must be bored, or worse, bored to death.:lol: It only take a day or less to R&R an engine with the right tools. I think you would like the L20b a lot, but you need a L20b flywheel, clutch cover and disc, the L16 flywheel, ect. are differant.

[jon521]

nah he is a cool guy. he has nice 521, he is on here but not very often, i think. he just had the flywheel resurfaced, but i just bought a clutch kit for my l16, but i havent put it in yet. do you think oriellys would let me return it and get one for an l20b.....?

[Z chopper]

nah he is a cool guy. he has nice 521, he is on here but not very often, i think. he just had the flywheel resurfaced, but i just bought a clutch kit for my l16, but i havent put it in yet. do you think oriellys would let me return it and get one for an l20b.....?

 

 

no harm in trying if you still have reciept

[jon521]

yep i keep all the reciepts for everything i buy for my truck. so i will talk to the seller about how long the offer stands and will read up on what needs to be done for the swap. i know the oil pan and dip stick need to be swapped, but thats all i know about the swap

[wayno]

I forgot, you also need the L20b throwout bearing, actually the sleeve is what you need, you need the one that goes with the clutch cover.

[wayno]

The L16 oilpan and oil pickup tube will just swap over to the L20b. Probably be better if the L20b comes with its own carb setup, I have always run a header on my truck, I think the L16 exhaust mani will work, but the L20 is taller than the L16, I bet someone will chime in for that answer, if it needs some kind of mod. It would be better to get a L20b head with square exhaust ports also.

[jon521]

The L16 oilpan and oil pickup tube will just swap over to the L20b. Probably be better if the L20b comes with its own carb setup, I have always run a header on my truck, I think the L16 exhaust mani will work, but the L20 is taller than the L16, I bet someone will chime in for that answer, if it needs some kind of mod. It would be better to get a L20b head with square exhaust ports also.

 

 

i dont believe it comes with any manifolds, but i can order the correct jets for my weber and put them in. i dont know exactly what head is on the l20b, but i know its all round ports. he was saying that you can put a square manifold on a round port, but not the other way around, so my manifold would kind of work? and i have a l20b a46 intake manifold.

[jon521]

I forgot, you also need the L20b throwout bearing, actually the sleeve is what you need, you need the one that goes with the clutch cover.

 

 

if i am able to exchange my l16 clutch kit for an l20b kit or pay the difference, i believe it would come with the bearing

[banzai510(hainz)]

if i am able to exchange my l16 clutch kit for an l20b kit or pay the difference, i believe it would come with the bearing

 

Thats the EZ part now you need the correct collar for the T/O bearing.

[jon521]

Thats the EZ part now you need the correct collar for the T/O bearing.

 

 

is that something i can pull from a yard? or something i need to buy? i dont really know what that it honestly...

[wayno]

The throwout bearing is pressed on to the collar/sleeve, you can do it yourself with a vise, your kit doesn't have the collar, the easiest way to do this conversion is to get a engine/tranny combo, that way everything is there already. Yes the square port exhaust manifold will fit onto the round port head, but I would consider it a temporary thing, I did it for a while waiting for my super head to get done, then I changed over to a header when I put that head on. I am not saying that the header is better, for me it was just easy at the time, as that was before the "U pull its" appeared in this area.

Yes you can get the part in a wrecking yard if you can find a L20b in a 620 pickup or an early 200sx, but you would have to pull the transmission to get to it.

[banzai510(hainz)]

Wayno

L20b in a 620 pickup or an early 200sx???

those are different lengths as a L20b car usues a 200mm flywheel.

 

if 225mm pick a 620 truck .

 

 

rockauto has clutch kits that show the T/O bearing with a collar ,but I really dont know if they really come with them

 

 

I found it on this site(no nothing about them)

autopartsplace.com hit nissan 77 620 and go to page 2 transmissions. they even list the daiken stage1 kit!!!!!!!!!!!!

http://www.autopartsplace.com/shop/index.php?N=0&Nr=AND(universal:0)&No=30&Npp=15&VN=4294967252+4294967085+4294965734+4294967247+4294967173&PN=4294957184

[jon521]

that would be nice to get a 5 speed from a l20b along with the l20b itself. but i dont work a whole lot, only make about $150 every 2 weeks so i dont know how i could buy both. if i buy a collar for a L20b T/O bearing, will it work with my stock 4 speed trans?

[wayno]

Your L16 4 speed will work with a L20b i beleave, but like I said, the L20b has a 6 bolt flywheel, your L16 flywheel has 5 bolts I think, so you need the L20b engine, the flywheel, disc and clutch cover, and I beleave you need the collar that holds the T/O bearing that goes with the clutch cover, datzenmike knows a lot about this kind of stuff, he even has photos of all the differant ones(collars).

[wayno]

Wayno

L20b in a 620 pickup or an early 200sx???

those are different lengths as a L20b car usues a 200mm flywheel.

 

if 225mm pick a 620 truck .

 

 

rockauto has clutch kits that show the T/O bearing with a collar ,but I really dont know if they really come with them

 

 

I found it on this site(no nothing about them)

autopartsplace.com hit nissan 77 620 and go to page 2 transmissions. they even list the daiken stage1 kit!!!!!!!!!!!!

http://www.autoparts...3&PN=4294957184

 

I was just refering to the vehicles that have a L20b with 6 bolt flywheels, as far as i know, you can use the 200sx flywheel, disc, cover, and collar on any 6 bolt crank L20b engine and it will work with any L block transmission, I am not saying to do it, but when you have no money, you take what you can get for cheap. I quit using the dogleg 200sx trannys and all the hardware because it couldn't take the stress of the work truck duties/loads, that is why I figured out how to make a 85 720 shortshaft 5 speed bolt to a L block. I also use the 85 flywheel, disc and cover, the disc is huge.

[jon521]

Your L16 4 speed will work with a L20b i beleave, but like I said, the L20b has a 6 bolt flywheel, your L16 flywheel has 5 bolts I think, so you need the L20b engine, the flywheel, disc and clutch cover, and I beleave you need the collar that holds the T/O bearing that goes with the clutch cover, datzenmike knows a lot about this kind of stuff, he even has photos of all the differant ones(collars).

 

ya the seller has a flywheel and got it resurfaced. So the parts i need to get are a clutch kit for an L20b, and at collar for a L20b T/O?

[banzai510(hainz)]

on the basic trans 4 speed or 200sx 5 speed it dont matter

Its the flywheel size. 200mm 225mm and 240mm

 

yes L20s ARE 6 BOLT cranks and there can be at least 3 size flywheel options to use.

200mm youll use the 510 set up, disc,pressure plate(most will use the Roadster set up)& t/o bearing and sleeve

225 mm is the 620set up this means the T/o bearing set up is different length

225mm also in the Z cars

240mm set is another.

 

You need to know the flwywheels size!!!!!

 

L20s had 200mm in cars and 225mm(heavy) in the trucks. theyare heavy for towing,

 

If the L20 came from a truck I can only assume its the 225mm. But only you know till you take it out.

 

most kits font have the collar in the kits if you have to swap to one or the other

 

 

521s all were 200mm flywheels but 5 bolt as thats L16/18.

there was a 1 yr only 225mm 5 bolt but rarely seen.

[jon521]

alright. ill have him measure it for me and let me know

['70 521 L16]

my advice would be to buy that thing if it looks like it's even close to worth it. if you don't you'll be kicking yourself on down the line when your engine goes or you have to do some major repair where it'd be easy to swap. is your clutch slipping on the l16? that's a prime excuse to swap roight there. i couldn't find a collar on rockauto so that might be a junkyard find but i doubt one would be more than a few bucks. clutch kits usually come with the bearing itself though so at least your'e saved that much trouble. i got my engine/tranny from a guy who pulled it all and he was cool enough to set me up with pretty much everything i needed, collar included, but this is something you want to get right the first time so you're not pulling and pushing 3 or 4 times to get it all right. do you know what the engine came from? car or truck? year? either way the 4 speed will bolt right up provided everything between it and the engine has been dealt with. this is basically the problem you're dealing with.... these are mg ones but close enough to get the idea.

 

 

basically it won't go into gear if anything goes wrong because the bearing won't have the full range of motion it needs to engage the clutch properly. all in all though i say gopher it. once it's all said and done you'll love it. beautiful truck btw. you got the height juuuuust right.