edakotaford Posted April 23, 2008 Report Share Posted April 23, 2008 so i am supposed to be picking up an L20b for my dime in about two weeks. i've heard a lot about swapping L16 heads onto them for better highend power. not sure exactly though the specs of the modifications, or the engine when it's done. any modifications in mounting or timing of the engine i'll need to do? Quote Link to comment
datzenmike Posted April 23, 2008 Report Share Posted April 23, 2008 The L20B works best with an L20B head. A stock 510 L16 head has small valves and ports and a weaker cam. Even if you could find one of the 219 SSS heads, any P-nut L20B head can be converted to it by opening the intake ports to 1.5". The L20B head cam has the same specs as the SSS cam on the L16, actually a very small extra lift. Quote Link to comment
edakotaford Posted April 23, 2008 Author Report Share Posted April 23, 2008 hmm, alright. would you recomend a new cam or any other new internals while i'm building it? i'm wanting to get the absolute most out of building this thing. Quote Link to comment
banzai510(hainz) Posted April 23, 2008 Report Share Posted April 23, 2008 How much money you got to spend. Im always for putting in Cams and carbs. schneider Isky Webcamshaft all make reasonable lift cams but youll need new Rockers(Mr-auto-parts.com) springs,lash pads, retainers you can get this from the website from where you order the cam or get Nissanmotorsport ones if you have the part # if you know what size you need. the620.com has some info on there or find a Motorsport book for part #s if you have NO MONEY, just PORT everything OUT and get a eleltronic ignition if you dont have one already and call it good Quote Link to comment
fiveNdime Posted April 23, 2008 Report Share Posted April 23, 2008 i'm wanting to get the absolute most out of building this thing. How much do you want to spend, cause you can be into this for thousands of dollars. I would leave the bottom end stock, its bulletproof enough. You will need pistons and rings though if your boring it out. Head work is spendy and you can do allot to them. Try getting a close chamber head, preferably with 1.5" intake holes. Then you can port and polish and gasket match. Put larger and better valves in. New seats. Do a cam, you don't have to buy one if you can have it reground. Better springs, and new misc pieces like lash pads and rocker arms...etc. Do ARP hardware. That what I have done in the past and seems to work good. On top of that you will need to keep it breathing with some good exhaust. A decent ignition system with good plugs and wires will also help. Remember to do a good intake and carbs....see how this is a never ending story:lol::lol: If it were me I would try to find a 80 or 81 pickup with a Z22. All you would need is the bottom end including block. Then bore to fit KA pistons in it...and dont tell me it cant be done and run all day long for years....:lol::lol: Quote Link to comment
edakotaford Posted April 23, 2008 Author Report Share Posted April 23, 2008 well thanks so much for all your help guys, i'll most likely be using a compilation of a lot of stuff. i'm wanting to keep it as cheap as possible with still getting some good power gain. Quote Link to comment
banzai510(hainz) Posted April 24, 2008 Report Share Posted April 24, 2008 the cheapest and fastest power gain would be to find a 38DGES weber carb. find one used or about 350$ new webercarbsdirect.com otherwise going the avove route that I mentioned will be 800-1000$ when said and done(done right with new parts) or wait till somebody has a built one for sale when they upgrade to a KA/SR. then you can get a deal Quote Link to comment
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