well would a L20b with webbers and a cam go harder with the stok head or go btter with the naps z 2litre head on it?

Good point. I was told that the Z series 2ltr produced 69rwkw, STANDARD, and that the z series could be made to breath very well. ChickenHawk has the contacts.

hmm, yeah, the ports in the Z head are a little too low and too small to work as well as the L.

they're a better proposition for a turbo setup, being crossflow and all....

So from all this interesting discussion, I should assume that a L20B with it's own cyl head, modified for hard street driving, carbureted, would be better than the Z engines, but if turbo is considered, then the napz engine would be better?
The Napz cyl head looks cool, crossflow, but looks is not all, performance is the # 1 goal, so, a twin DCOE L20B stock cyl head engine would be better than a Napz twin DCOE motor?
Want to clear that doubt.
Later.______________________

Turbo application: I think he meant the crossflow head would be easier to package the turbo, not necessarily better performance/hp. The turbo goes on one side of the engine, the intake on the other side.

Actually, that's a question of debate unless we see some actual dyno figures, since I've been told that the Naps motors make better hp than comparable displacement L motors.

Anyway, this topic would have some real direction if Jaime actually wanted to do something and had a goal in mind instead just asking a theoretical question.

Hy mates, Hy Matt, following in on to your remark, I have a direction, which is to put into my 610 a performance motor(street), when I do something like this, is for myself, not planning to sell my car(s), so I want to find out exactly where should I invest money for my own fun. I want to preserve as much Datsun in my car as I can combining performance and individual tastes. I love Datsuns, I love performance, and also I must confess, love rotary engines, so, I thought about getting a rotary, and, keep the 610 L20B , if I can get decent performance, I know it is a older motor, but, decent performance, I might not be the fastest guy in the world, but sure good performance, excelent efficient development, the feeling of driving a tuned, capable machine, is what I enjoy. I think the rotary will be a project for my B210, which is not in such pristine condition as the 180B, and the A series engine, modified(in the 120Y as of now) will go into the 1200 ute, in my bro's south american hotel in equarorial lands(part of the reason for the A engine going there is that gas prices there are crazy, the A engine makes more sense over there.). I will not get rid of the engines I have(L20B, A15 ), but that was my dylema, rotary into the 180B, L20B into the B210, A series into the 1200, but if I can keep the L20B in the 610(provided I can get good performance), that will do. I am a fan , automobile enthusiast, not a expert mechanic, but not afraid of mechanics, I love it. Every car I ever had, I bought the car's book(i.e. Chiltons) and hands on the job, took out engines, opened engines, replaced internal parts, took out cyl heads, brakes, chasis, everything. Sure it takes me more time, but the satisfaction of having done something myself, with quality(no mess up threads, no power tools, good work) is only comparable to sex with 3 playboy girls at a time.
I just would not want to get into preping up the L20B, only to be told later, "a napz engine would had done it without any work"
Both motors are similar in size, only if really worth it, I would consider a Napz.(or the cyl head swap).
Have a good weekend everybody.
Matt, have you seen Brads' 610? I have not, yet.

Later.__________________________

Quote:

1. I've heard this from several places, but we did run a monster cam in the ChickenHawk engine with no problems.

2. There are more issue to be dealt with than just the timing cover, depending on how thorough you want to be. The oil feed holes don't line up, so you either need to modify it at the head or run an external cam spray bar. the head gasket doesn't fit too well (although using the Z20E timing cover might help that). None of the water jackets line up 100%. Usually they work okay anyway, but this is a deal breaker for me. Just be aware the head is not a bolt-on affair.

Besides, the Z20E bottom end is actually a bit better than the L20B, IMO. It has longer rods (slightly wider torque band), and smaller pistons (revs a bit smoother/faster).

Jaime, okay ... I take it you seriously are wanting more performance, but are on a tight budget?

If so, here's my advice:

1. FORGET the Z18et head
2. FORGET the NAPS motor altogether
3. Find a low-mileage KA24e or KA24de for a motor swap with a 5spd trans.
4. Keep your L20b for sentimental sake

Quote:

3. Ditto.

4. Nope. Send it to me.