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Head Info.!??

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DatsunMinis View Drop Down
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    Posted: 16 Apr 2012 at 10:08pm
Can Anyone Tell Me What Heads Came On All The L Series Motors.. Post It In Order From The Best One To The Worse One..!! And Any Info On Why Some Are Better Than Others...!!??? Thanks.!!
1975 Datsun HL620 L20 4Spd

1976 Datsun HL620 L20 4Spd P/T

1977 Datsun HL620 L20 5Spd

1985 Nissan 720 Std Z24 5Spd

1985 Nissan 720 Std Z24 5Spd
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2012 at 4:39pm
Casting # Chamber type Description
A87 open or closed found on many L-18 and L-20B's. The "domestic" version usually came with open chambers. Many of the "used Japanese import" engines came with the peanut version of this head. Large quantities of these used engines were imported in the 80's, so the peanut version is fairly common. These heads usually have 1.25" intake ports and square exhaust ports. 1.65" intake valves. Exhaust valves can be 1.38" or 1.30"
W53 closed (with some exceptions) This head is from the Japanese market. Some of these castings are for factory fuel injected engines and have notches in the intake ports to accommodate injectors. 1.25" intake ports and square exhaust ports. 1.65" intake valves and 1.38" exhaust valves.

219

11041-V9182 closed The true SSS head from imported used engines or ordered from the Datsun comp. catalog. Later versions could be ordered from the catalog with a V912 casting. 1.50" intake ports, square exhaust ports. 1.65" intake valves and 1.38" exhaust. These are hard to find. Any of the other closed chamber heads can be "converted' to this design by simply opening up the intake port to 1.50" (if that's desired) Some of these heads are marked "A87" on the side, but have "219" cast at the front of the head, just below the timing chain inspection plate.

210
(some have no number)

11041-N2202 SV open (with rare exceptions) This is the head that came stock on the 510. Tiny 1.125" intake ports, square exhaust ports. 1.50" intake valves and 1.30" exhaust valves. There have been variations reported on the valve sizes. This head is believed to be originally designed for the L-13, and engine never imported to the U.S. I know of one that has the peanut (closed) chamber with 37cc displacement. The earliest versions had more of a "semi-open" chamber design but later examples were the open chamber design. These heads are usually avoided on performance applications.
U67 open The stock cylinder head for many L-20B's. 1.375" intake ports, square exhaust ports. 1.65" intake and 1.38" exhaust valves.
U60 open Identical to the U67 head, this number has been found on very early L-20B's. It seems to be fairly rare.

W58

11041-W5880 open(with rare exceptions) This is the L-20B smog head usually found on '77 and later engines. 1.375" intake ports with ROUND exhaust ports. These exhaust ports have steel liners that help burn off emissions. I know of one of these castings that has closed chambers. These heads don't flow well and are avoided for high-performance applications.
N56 open(?) This is an emissions head that appears to be identical to the W58 casting.
The combustion chamber design has not been verified yet, but is probably open.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DatsunMinis Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2012 at 5:21pm
My Parts Truck Has A W58 on it and my other two have U67 on them.. so W58 isnt all that great then.??
1975 Datsun HL620 L20 4Spd

1976 Datsun HL620 L20 4Spd P/T

1977 Datsun HL620 L20 5Spd

1985 Nissan 720 Std Z24 5Spd

1985 Nissan 720 Std Z24 5Spd
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shawn2122 Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2012 at 6:07pm
Just went and looked at mine.. And right below the fuel pump it says A87.  What is the best head to have?? 
Thanks!!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smooth620 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Apr 2012 at 6:46am
Originally posted by DatsunMinis DatsunMinis wrote:

My Parts Truck Has A W58 on it and my other two have U67 on them.. so W58 isnt all that great then.??


W58 is an  emissions head that is undesirable for gaining more hp.
U67 is an  non-emissions head without water jackets for the intake manifold, has the desired square exhaust ports,  has great potential for adding hp.  

Your heads are probably USDM and  most likely 'open'.
Better to learn from other peoples mistakes than to make them yourself.-Anonymous

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Post Options Post Options   Thanks (0) Thanks(0)   Quote smooth620 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Apr 2012 at 6:57am
Originally posted by shawn2122 shawn2122 wrote:

Just went and looked at mine.. And right below the fuel pump it says A87.  What is the best head to have?? 
Thanks!!!


An A87 on a L18 in a US '74 620 is probably an 'open' head. If you discover it's a 'closed' head then it means someone swapped in a JDM L18 or maybe just swapped the head (unlikely).
Better to learn from other peoples mistakes than to make them yourself.-Anonymous

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Apr 2012 at 10:21am
All the heads are ok to have, they all can be worked over to have gains in low end torque or top end. Some say the w58's  arent any good but they do come in a closed chamber and the intake ports are the same size as the u67 and u60.  Just for reference the u60 head is identical to the u67 however it does have the coolant ports for manifold heating.
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