P90 will drop you compression so you have a larger range of pistons available to fine tune your compression but the N42 head has the largest vavles out of the 2 and is a lot easier and cheaper to modify and get a hold of. Call first to confirm availability. Just to add my experiance which pales in compairison to the other guy's on this site but. With a stroker what are the best conrods? Using a compression calculator mine came out to a little over 9:1 factoring in some valve releif work and the notches in the block and using a 1mm Felpro gasket. A more suitable grind for the street would be around the 72 degree grind, or I have used a 65-25 grind with good results for a streetable motor.
Get tested to determine safest over bore possible, be very happy if you can get a 89 or 90mm bore, it will be a good torquey motor. Popular opinion is that the E30 stock valves are too small, which results in a lack of flow. I would shot peen them too if you have anyone that can do that for you. This head has a high quench design. Again, this is a budget racer. If not, I'll either dial it back to 9 or bite the bullet and get a thicker head gasket. Aluminium heads can run higher compression before pinging than iron The highest compression you can use on the street with 93 octane gas is about 10-10.
As has been mentioned, you'll want a good ignition system. There is simply no other like our Stage-4 engine setup. They will need to be replaced with hardened steel seats. He lives in SoCal, and was running your crap gas. I am having a big internal battle with turboing.
A place for discussion of all things Datsun! The 240 E88 had a closed chamber design similar to the E31 Head and smaller valves than the 260 version. I'm getting ready to start for the 1st time my rebuilt l28e with the stock N42 head and new flat top pistons. I actually replaced them with new softer stock ones, which allowed the extra torque from the 3. Can't wait to get started. Pump gas 93 octane ready. Of course you should replace the front differential mount with a '75-78 version. Can't go too much more lift than that or else the pistons start hitting the valves, but those should be safe.
Prices are subject to change without announcement. I use a E88 head with bigger valves like your N42. Willthe aftermarket computer compensate enough to run a race cam on the street or will it be undriveable? Now it's the other way around. Each one of our long block rebuilds goes through a multi-step process to insure our warranty will never need to be used! No problem on the Jim thing. The problem is that if you go bigger than that then you have to deal with coil bind on the valve springs and get different valve stem seals search Jessz, lots of info on that stuff. You need to notch the L24 block if you put on an N42 head. The N42 heads have hardened steel seats so it can run unleaded petrol.
Check the cylinder head between the 1st and 2nd spark plugs to find the cylinder head code. Because it's designed for a turbo, it's a somewhat low compression head. This can open many doors in tuning. Oz001, Bajcsi over on zcar. Edited September 14, 2011 by Lazeum It is a stock cam.
Ex liners heat up while the motor is running and burn off excess hydrocarbons in the exhaust. Come on in, introduce yourself, and post some pics of your Datsun! Some builders go to the effort of resizing the holes and threads to take 12mm bolts. Un-shrouding the valves on this head would increase chamber size slightly and make for a good engine head on a big displacement L-series build 2. While it may not have the scream of the itbs, it will be much easier to drive, easier to tune, and easier to get more power out of in the future. I didnt put a budget either and if it hits 7k or more I will be swapping an rb25 into it.
If you choose one, you'll be able to tune your engine for new cam, fuel and so on, so making your engine well shouldn't not be a problem anymore. The intake ports were matched to the intake manifold, and a very light port cleanup was done budget racer. We make sure you not only get a great performing engine, but one that looks amazing too! Talk about a wolf in wolf's clothing. My personal preference would be for Haltech or Motech, more exxy than some of the others but that's what I prefer. Dave has something like 30 grinds that he uses. Note: The 05L has a more shallow combustion chamber than the deeper P90. Conventional engine wisdom is not to match dished pistons with chambers designed for flat pistons.
Yeah what a great post. The 280Z got a bigger 1. I'll follow this thread with interest german240! I'll be happy if I break 200whp with my parts. You won't loose any drivability either. I don't know either way.