pontiac 400 valve adjustment

Come join the discussion about performance, modifications, troubleshooting, maintenance, history, and more! Is there anyone out there that can help me with my valve lash question. If true then I should just make sure all the nuts are tight with the valve closed and reinstall the valve covers with fresh gaskets. If you try to use any of these procedures with the factory rocker nuts, they -will- come loose and you won't be happy with "what happens next". The lock nut is torqued to the bottle neck of the stud or the end of the threads. Powered by vBulletin Version 4.2.3 Copyright 2022 vBulletin Solutions, Inc. All rights reserved. The stock Pontiac nut bottoms out on the bottleneck portion of the rocker stud so you cant move it past that point. Any suggestions? I understand what you are saying, but I have found a couple of times when reusing used rocker parts that they did not quite work well together. Thanks Greg that is the same way I adjusted them before. If you must keep it running here, please support this endeavor and select a support plan - which starts at only $0.16 cents per day. 50 dollars worth of polylocks save you alot of heart ache down the road. A forum community dedicated to hot rod owners and enthusiasts. Secondly the driver's side has a sheet metal shield above the rockers below the valve covers. If this is a stock pontiac head, the proper way to adjust the vales is to torque the nuts to 20 ft. pounds. I hate poly locs, they're a PITA to keep the setting right while locking them down, IMO. The easiest way to do it is with the car running. He takes care of it and does not drive aggressively. Pontiac offered 3 different lengths of push rod, each .060 inch different, to compensate for valve grind, block/head surfacing, other issues like valve train variation when the engine was built at the factory. This was when I was young and broke just trying to add some HP to a mid 70's daily driver with the smallest possible $$$ outlay. http://www.pontiacstreetperformance.com/psp/rockers.html, Quote from: Clint s on July 20, 2009, 07:40:42 PM, http://www.78ta.com/gallery2/main.php/v/soonerta/, Quote from: SoonerTA on July 21, 2009, 09:24:15 PM. I cant get the car to idle down to the recomended 500RPM in my book. That is it, from front to back 1,3,5 and 7 are on the driver's side 2,4,6 and 8 are on the passenger side in that order. If the aftermarket cam has a different base circle, as they usually do, the plunger in the lifter is either pushed too far, or not far enough. Starting with #1 cylinder, turn the engine over until the exhaust pushrod just begins to move up. Thanks. here's the procedure per chilton & clymer manuals. I think i have a vac leak. The stock one is just a torque and go thing and there are several methods of doing the other way. It is a little messy, but works fine, did it many times took a valve cover and cut a strip out of the top to get at the nuts. https://www.google.com/search?q=intAgAEEs&biw=1089&bih=527#imgrc=h4aATxujEZIM-M: 1964-1974 Tempest, Lemans & GTO General Discussion, 1964-1974 Tempest/LeMans/GTO Tech/Electric Wiring, Service, Maintenance and Technical Discussion, 1964-1974 Tempest/LeMans/GTO Restoration Projects, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. They say it does not matter if the valves are open or not, but I always torque them with the valves closed. The motor has a crane cam in it with hydraulic lifters. Would it be the same as a sb chevy. right?? In either case, the set up is not correct! To me this is the easiest way and these Pontiacs a a bit finicky when it comes to valve adjustment. Thank you. That way I can check to see if the push rods spin or not (no preload) if they spin I usually tighten them just enough to stop them from spinning. I'm not asking for much. A forum community dedicated to Pontiac GTO owners and enthusiasts. Thanks mike, i let the machine shop talk me into the poly locks. For a better experience, please enable JavaScript in your browser before proceeding. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. vac gauge jumps about 4-6psi (cant remember the number, ill check again and write it down. That Vac guage reading is classic Valve adjustment too tight. It sounds like you've got a couple valves too tight. Some gasket sealant or install dry? On a cold engine, just torque it to 20 ft/lbs Valve position doesn't matter. What is my method of installation? They will look like little fingers protruding from the top of the valve cover. You are missing one or someone left it off. I did have a couple of pressed in rocker studs pull out in just a few miles of "spirited driving" It probably would not matter if you used all new parts like I would today, but old habbat. The other, and later method is the valve covers will have "oil drippers" spot welded to the tops and serve the same purpose. BTDC.) This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. I am disappointed that I cannot fine tune the valves. as long as the valve length is at the right height, assuming all else is good, the stock valve adj. Only to install a freshly done set of 670 heads and a new style rear main. Thirdly, I purchased new cork gaskets. Thank you to both of you. :thumbup: If any of the valve train components have been changed, such as the cam, you can't use the stock adjusment method. I just need a little help. Turn the crank till the lifter is down, tighten the rocker till you take up the slack on the push rod, then give it 1 1/2 turns to preload the lifter??? I'd loosen them up until they rattle while idling, then tighten them down until the quit and go 1/2 a turn past that point let the engine idle for 30 seconds before tightening the poly locs. 0 Members and 1 Guest are viewing this topic. You need to use a positive locking nut (poly-locks), because the stock type nuts won't hold the adjustment. This assumes stock rocker arms and stock bottle neck rocker arm studs. None on the passenger side. last night i reset the dwell and timing (30 and 6degr. The "performance" Pontiac heads have screw in studs and guide plates from the factory, the only down side is the 7/16" to 3/8" bottle neck stud. it goes E-I-I-E-E-I-I-E,i also am running performer,ARP7/16 straight studs,Mr Gasket poly lock with set screw. JavaScript is disabled. In the coming weeks I would like to change my intake as well as my lifters and would like to know if there is a simple resource (manual, web site or tip)as to how I can adjust valve lash. the correct way to adjust rockers on aftermarket cams is to have the lobe on the flat spot of the cam, which is done one of 2 ways. New rings and bearings installed "just because" (I was burning oil bad from a previous low mile 0.030 rebuild) with not doing the 100,000 mile heads. will work. I'll check for the oil groove and the contact point of the rocker on the valve. Is there a torque spec for these rocker arm nuts? Please don't miss the point that unless you have some sort of locking/poly-lock rocker nuts, Pontiac factory valve trains (using the bottleneck studs) are *not* adjustable. Patient: 1967 GTO Convertible with 400ci, hydraulic flat tappet lifters (assuming this because car is stock) & TH400. This car and engine seems all stock and won't be run hard. It is owned by a friend of mine and I'm doing some work for him. The heads will be ready in a week and when I re-install them I would like to know from the membership on the proper way to set them up. Last fall I tore down my Pontiac 400 "WT" motor from my 67 Firebird. A. You know I'll do it that way again and I'll only give them a half turn. i was hoping you would chime in to since i built mine to match yours. Not sure I'm clear on that with regard to a Pontiac, would work for a Chevy. When I installed the heads before I went by the cam install instructions. It may not display this or other websites correctly. cole. View Full Version : Valve Adjustment 67' 400 with PolyLocks. If you've got high pressure springs in the engine then yes moly push rods are cheap insurance. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! The 1964-1974 Pontiac Tempest, Lemans & GTO, 1964-1974 Tempest/LeMans/GTO Engine Tuning, The Fora platform includes forum software by XenForo, www.pontiacstreetperformance.com/psp/rockers.html. thats what im running the performer(cause i had one laying around) the XE262H with new lifters and push rods i changed to a 7/16 stud with comps roller tip rockers. JavaScript is disabled. You are using an out of date browser. So I figured if it was a ringseat problem, new rings would resolve it, if it was sucking oil from the worn guides that would resolve it. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Please consider whitelisting my site in your ad blocker. IF any of the things listed have been done, different length push rods will be needed. did you buy a new cam?don't put new lifters on an old cam or you'll scap the cam,also the only gain switching to the performer is weight savings,everybody says XE262H is one of the best cam out there right now,im running the old school 268H,(pulls REAL hard till 4500RPM and then runs out of steam) it was in the engine when i got it the car,it doesn't require adjustable vavle train but this year i switched to full adjustable with roller tip rockers.i used the method in the link posted by Clint s worked perfectly.good luck! I recently removed the heads off my Pontiac 400 block and was wondering about the valve adjustment. cam or no cam. Im so used to screw in studs, i had forgotten about pressed in, had that happen on a 69 small block Chevy. i really appreciate that link it will help me out alot when i do this tomorrow, but i have one question which valve is exaust and which is intake? The motor is a 400 4bbl with 6x heads. A photo of this is attached. I would swap the cam & lifters and reuse all the other parts. But the difference is the 1/2 turn part. Even if you have roller tip rockers? Is this correct? The standard "set distance" valve train is a real issue. I thought the XE262H cam doesn't require an adjustable valve train? Tomorrow I will torque each nut to 20 ft lbs with the individual valve closed. uh i hope someone can clear this up cause i just spent 2 hours adjusting them this afternoon. Pontiac-Oakland Club International Forums. For a better experience, please enable JavaScript in your browser before proceeding. We need to know if you have a stock cam or did you go bigger with and adjustable valve train (which you must do with a bigger cam). Well I'll let ya's know by the end of the week how it runs. link to a head, CTRL and + will blow it up. I think I gave them a full turn and a half before. The shields are "oil drippers" which capture the oil splashed by the rocker arms and directs it to "drip" back into the rocker arm to aid in lubricating the rocker arm ball. Ebay typically has these. just make sure of your plunger travel. Loosen up until it starts clattering tighten till it stops and then 1/2 turn and lock it down.

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