well when I say 120Y i'm referring to a USDM 81 310, and 1 good stop from 80mph and they're on the way to being faded, sure you could spend money on expensive brake pads and get 2 or 3 stops before they're faded.

I think the oem brakes that came with the A15 are crap.

You also need to factor one more thing.You should read:cost/power/WEIGHT ratio.

Well 120Y brakes may be lacking, but 140Y/B-210 brakes are fairly decent. The 74-75 early ones are the medium size discs (same as PB110 L14 car), and the 76-78 ones are the large ones.

did you upgrade brakes and suspension yet? I'd do that first, the 120Y disk brakes are unsafe at highway speeds...

I'm just trying to balance the cost/power ratio. I don't want to spend a lot of money getting my A14 beefed up, to find out that I could have swapped an L for less to get similar results.
I've already put some money in, but the cam upgrade and the swap are a lot more. Just want to get the most for my money.
I don't need it to scary fast since this is my daily driver. Even with my 510's I only did the KA swap.

if you have a decent running car, learn to get 100% of the power it has, and even 75 Hp will get you going plenty fast.

Then when you master that start adding more power.

too rite there

I'll go with my standard: For a street car the weber 32/36, header, dual valve springs and a street cam should work well. I'd estimate 90-95 HP. Stocker was 78-80 HP so that's pretty good. Throw some sway bars on , good dampers / shocks , 175/60 13's better brake pads or even fab some plates to mount Wilwood calipers and it will make for a super cheap and fun run about.........otherwise put in a twin turbo Z motor , huge brakes near race suspension cuz if your gonna make it a money pit it should be scary stupid fast................Seriously I wrestle with this all the time; make my 1200 wazoo fast or keep it fun, cheap and reliable. End of the day I always decide that if I want a super fast car I should just go back to the single seat race car and learn not to whine about the cost.

For me Datsun is about low bucks fun.

Tom

L-series engines -- even the L14 in the PB110 -- were fitted with H165 or larger diffs.

The H150 ring gear is less than 5-3/4 inches so it is still "tiny". It's only good for maybe 125 ft. lb. torque. See Diff Torque Rating

So if I decide to do a L18 or L20b swap, would I have to replace the rear end to handle the power or is the H150 OK. If I read right the 620 or 510 wagon rear should work without shortening, right?
What about width? I seem to have a lot of clearance, so how much wider are these rear ends?
Oh, and thanks for the advice.