Tony D

NOBODY CAN "ALIGN BORE" THE BEARING SADDLES! You keep refereeing that as some sort of option, as explained before its not! Pete at PMC simply stated what everybody else said, and also confirmed how most production shops do this. It's NOT L-Specific... It's a basic "Marks Machinery" book solution to this type of assembly. If this was to go to an industrial machine shop...the checks they old do using non-dedicated jigs and equipment would stagger your mind. Each non-spec item would then be addressed line-time on the bill. You're doing a lot of checking without a CLUE what you're looking for, which I see all the time. People have told you adnauseam the head must be FLAT AND STRAIGHT... That's top and bottom. From what you say above your topside is warped some 0.010" after they milled the bottom. ANY machine shop should know at this point you must take off the top what you cut off the bottom if the height and cut specs exceed a given point. Pursuant to a topside flatness check revealing the actual warpage. Are you in ANY of the local Z-Clubs? Houston has a buttload of helpful Z-Clubs and an EXTENSIVE list of GOOD L-SAVVY machine shops. It boggles my mind that wasn't your FIRST stop for recommendations when looking for Datsun Headwork. If this shop was suggested by local Z-Club people I would be shocked! I hope this is not the case!

JohnC is fabricating drama, there are stacks of Bernoulli magazines in his bathroom, glossy paper rubbed between the hands makes for an effective wiper. Don't let him fool you! Yeas, that's why the Sauber article was missing John...

That should have been step one 22 posts ago... If you think 0.008" head warpage is "acceptable" you really need to go back to the FSM and read (between the lines)! Why does a 0.003" feeler come to mind, and not a 0.008"? Japanese translations leave a bit to be desired... If you have 0.004" warpage on the head... And 0.004" on the block, you're good to go right? Because 0.008" isn't reached? Hmmmmmmmm... Second hint from the FSM: if your cam tower bore to journal clearance is X, and you have distance Y between towers, how much warpage Z --between two towers is allowable before one of the cam towers binds? Easier than that: if your clearance is X, and your warpage Z = X do you think your journal may touch the cam tower or not allow oil on that part of the tower? What do you suppose will happen when this runs (even if it "turns freely")?

Don't forget ProStreet...

Amen, bro!

Amen, bro! The use of an arbor is just common sense! It's how it was done in production, for sure! The "Flat Head" thing is akin to a Chev V8 getting shaved then not milling the intake manifold... The shops don't realise OHC means something on he top side of that warped bottom is turning in bearings with less than 0.003" clearance... I mean, if the BOTTOM is warped, exactly how does it work that the TOP would NOT be? Hahaha I know someone who milled his warped head (0.019" warp!!!) and used the logic "I'm milling for closed chamber anyway o 0.020" isn't a problem!" I warned him... Quick and cheap milling job with the head on parallel blocks to clear the towers (!)... Cam wasn't turning so they knocked he towers around a bit... It turned. Ran it at the track... BROKE THE CAM INTO THREE PIECES!!! "FLAT MEANS FLAT"! You would think that is pretty straightforward, eh?

My favourite at another forum was to click and paste the wannabe spooner's post DIRECTLY in the search box... In those days, 9 out of 10 times the EXACT answer came up in the top ten hits. I mean, what do you do with that?

You don't realise how much explaining I have to do overseas to explain JUST that point! Though I must admit to going "Big Paul" in Thailand, loud enough to have Australians come from two machinery pads over to see who was yelling and "wishing they had a pellet gun to keep your f-ing finger off the GD equipment! GET OFF MY COMPRESSOR PAD! ALL OF YOU GET THE F**K OFF OF MY COMPRESSOR PAD!" They thought I was Australian! LOL

I bought a talisman from a witch doctor/healer who said it would keep me safe while driving. THAT is a part I actually need!!!

For production, you tool a pneumatic arbor to clamp them in-line and sink the attaching bolts. String towers, air on, position on head, bolt down, air off...retract. Next station.

Saying repair procedures don't exist for this is just plain wrong. This is all basic machine shop work. But people go and buy on price from myriad shops providing 75% of what SHOULD be done when remanufacturing a head. Top AND BOTTOM of the head when warped must be returned to true. That means milling top and bottom. After straightening. Now we got somebody adding different steps guessing how its done at the factory making matters worse. The original L4's had iron towers with inserts. You don't "line bore" a non-split bearing bore without an oversized cam journal! You must weld the bores, and turn on a vertical mill. Everyone here is assuming these cam towers are line bored at the factory when strong evidence exists no such thing occurred. It was simply a jig (arbor)-assembled piece fom bins of pre bored, dimensionally identical cam towers in a box. You don't want to mess with the "mallet and turn" method of installation? SIMPLE AS PIE FOR A PRODUCTION MACHINE SHOP: Make a steel arbor of sufficient length, and 0.0005~0.00075 undersized the journal BEARING diameter. Stick them on the arbor like meat on a shush kebab and stick them on your head. Bolt them down, remove the arbor (some shops will GUNDRILLED the Center of the arbor o allow a shot of CO2 to shrink the arbor and allow the removal to be easier as line-to-line fits easily bind if you don't pull exactly straight... THERE YOU GO:ALIGNED PERFECTLY!!! If your head isn't warped, that is! This is building on a bad foundation, a warped head that was short-cut repaired, and now it's compounding itself with "make-it-fit" methodology. Any wonderment as to WHY Nissan said to simply replace it now is removed. They realised most customers will not pay for proper machine work, at a competent shop. They will go low-bid and their reputation (Nissan's) will be impacted as a result for any work done in the first 10 years of ownership. This is part of he reason they nixed the triple Mikuni package (165Hp) on the 240Z (emissions was #2, but that didn't stop Toyota using them north of the US Border on 2TG's in Canada!

That's an Autocorrect... BARRIS BARRIS might be an old fart. I was not hacking our H4 Light Supplier... Honestly, I wasn't!

Don't ever look at he Burklands Streamliner then! The "old fart" comment is funny as hell actually. It's got o be coming from someone jealous... Old Farts have done it, they didn't talk about it. When you got to really high level Motorsports events you notice something: lots of fat old white dudes calling the shots, and a bunch of kids dong manual labor at their direction. Very rarely do the physical prowess /skills and the wisdom necessary to effectively, consistently compete correspond. Harris may be an Old Fart, and you may not like his work. But there was a time he was "The Sh*t"! Until YOU have reached that level of acclaim, I'd suggest tampering I comments involving name calling... Always easy to criticise, much harder to achieve peer acclaim in competition on a big stage.

A race head I bought actually had heavy hardened steel inserts under where the head bolts clam the head. For a head that may have been torn down between heats, and several times in a weekend for inspections, good hardened washers or inserts combat embedment into the head... But does nothing to compensate for gasket compression aver time. Until the metal and composite gasket reach a density to further compress from the clamping forces present, rue torquing will be required! The so-called "no retorque" gaskets universally have high density RTV Rings (Think FlPro Print-O-Seal) which acts like o-rings around that which old leak. It compresses at a faster rate than the underlying composite gasket...so as that underlay compresses, the RTV memory expands slightly trying to contain what normally would start to be a sep or leak path. If you retorque that gasket, you do he same thing as the previous design: keep everything clamped. Consistently by combatting gasket impression over time, and bolt embedment into the Aluminium head from the cyclic forces placed upon it!

There is no oil passage between 3&4 that is there on a Turbo that is not there on an N/A... Methinks they say "no turbo applications" due to people detonating the hell out of them and they don't want the warranty hassle! You can stack those 0,7mm head gaskets o get 1,5mm...

If he paid off the van, then likely he's got homeowners umbrella. Really, having a million umbrella policy on your homeowners policy, and minimum coverage on your cars usually works to your advantage financially. (Even renters!) Anything not covered under the auto policy will go against the million dollar umbrella policy.. But they will have to litigate. Most won't. If they do... "That's what you got insurance for!" Plus, it comes in handy for things getting ripped from your house, your car...etc!

And his opinion impacts my self-esteem and opinion HOW, again, exactly?

"Cheap Machine Work Rarely Is..." "Quick Machine Work Rarely Is..." Etc.

So you disconnected spark plugs to isolate the knock, or just because there's a noise you're replacing it? Hmmmmmm...

One could.. But one would screw the pooch in doing so.

Missing the point, totally. I don't think it's a generational thing, but there IS a component common in all people complaining about achieves or holders of knowledge and those that don't yet have it: drive and desire. If you want information, do not make out like you're ENTITLED to it! I think Randy77ZT makes a valid point, but neglects one facet of those days: you STILL had to ASK SOMEONE! The scene in Christine where the guy lets Arnie Cunningham work on the car in his shop is a good example. The guy had been through the war (literally) and wanted to help the kid... But he wanted the young punk to know UP FRONT what the rules were...and as long as he abided by them, he could be very generous. Arnie, as demonised as Steven King tried to make him showed due deference because he realised without that old man and his shop, he would never get his dream going (demonic possession feats of mechanical rejuvenation notwithstanding.) If you think you will get knowledge without breaking your back, without toil, without hassle... All I can say is you aren't dedicated, don't have the drive, and likely won't finish the project. Or if you o, it won't be he best it old be...a 12 second car with all the same parts as another seemingly identical car that turns 9's. If you have drive, and a thirst for learning, you WILL break your back getting every bit f information you can. My nephew runs a 9second Malibu... People continually bug him for the tricks he employs... He routinely blows them off. Why? He didn't get spark plugs thrown at his head. He didn't work LOF for a year till an opening in heavy overhaul opened up. No, he was a GenX or Y kid, grew up with computers. The reason he acts just like like those grizzled old codgers? His words were prophetic: "I didn't do anything special. I asked a lot of questions, watched what other guys did, and I spent every single possible second I could researching everything I could find on he Internet about how to do this! It's not hard, it just takes time busting your a$$ learning everything you can. I tell them 'look on the Internet, all the information is out there!' And they get all P.O. at me or not spilling 3,000 hours research at nights, on weekends, at work, into a 15 minute magic formula to go 9 seconds in a Malibu! I busted my ass, it's not hard, but you have to WORK for it--it's all out here, you just have to look!"

Even better calling them out for a field calibration on a torque wrench, and when they realise whou you actually ARE ("uh, ahhh, is this Tony D?") and the caller I.D. From your hotel has not only the correct area code, but the same PREFIX... Oh, yeah! I love the guys who claim "you're one of those guys!" But like someone said at an MSA event a few years ago: "Holy Sh*t! You REALLY DO talk like that face-to-face!" (At the same event someone came over to point out three youngsters scurrying away and said "Were some guys named (Gave Screen Names of three guys) supposed to meet up with you? They were like "Is that Tony D? He doesn't look like the photos on the Internet!" They had come to "set me straight, forcibly"... But decided, apparently I was somehow not fat, out of shape, and old as dirt (anybody who knows can testify I am!) and took to the hills without so much as an introduction! I think the last contact I'd had with any of them online was to give them my location during the show (260 Island) and say "after you kick my arse, I will buy you a beer!" Maybe I should have offered a shot, some people don't like beer...I'm so insensitive.

Uh, just to set the record straight, the "2" stood for 2 Overhead Cams, not 2-Litre! 4 Valves Per Cylinder 3 Carburettors 2 Overhead Camshafts Unless you got an OSG TC24B/Z-1 on that L-Engine (or a home built permutation/conversion) THAT would "blow the 2-Thing"... Although "Z231" might appeal to some...

Are you a "Dragon" in Chinese Zodiac by birth year Ray? The Chinese tell me you symbol of your birth year is unlucky when it repeats and you must always wear red and yellow to ward off the bad luck! It's dragon year now, ima b a dragon, so can't wait for this year to be over as well. When the CHP took my statement I said "So the semitractor's left front tire went up on the trailer as the jack icing followed behind me. The trailer lifted the Dodge Ram up in the air, until the trailer hitch ripped free... Then that trailer turned left and headed my way like a f--king AAMRAM Missle!" He tried not to laugh, but apparently I was overwhelmingly hilarious with my statement! Opened the side of my truck up like a giant Sardine Tin!

Don't laugh, that WORKS! I mentioned "Gator Superchargers" which are based on the Toro Leafblower Impellers available as spare parts... Good as a single below 3.0L, twins to 6.0L...