Click on One of the Links Below . SHARE POST #29. Many modern cars have aluminum cast heads, which is a “soft” metal, meaning it is easy to strip out the spark plugs thread by over-tightening. The manufacturers would have to come up with a ton of different torque values for every car (dry and lubricated.) Send Private Topic View Profile. For this reason, the 390's factory torque specifications should be followed. got a 427. ft. 8-12 lb. October 26, 2018, 8:22pm #7. Cars built 10 years ago already started using aluminum cylinder heads. The cam is a 292 degree, 230 at .050 with .480 … 07-24-05 08:17 AM - Post# 746594 Hey guys, Im tryin to help a guy out and I need a plug reccomendation. Spark plug gap. Be the first to review this product. As a result, the firing end of the spark plug can overheat and pre-ignition can occur. Overtighten and you could damage the plug as well as the threads in the engine head. Big Block Chevrolet Head Bolt Torque Sequence. As said many . Too loose and the engine won't run properly. I run a bigblock with GMPP aluminum heads. Over 6,000 Automotive Torque Specs. Aluminum sacrifices to just about every other metal (except maybe zinc and magnesium). Ok thanks - - - Updated - - - I am anxious to see if these perform better than the ported 915s. The Edelbrock #60999 Performer RPM cylinder heads are designed for 1955-86 SB Chevy applications. Full-Torque spark plug inserts for aluminum heads are made of aluminum and are hard anodized to improve the strength and integrity of the threads. (Topic#107663) greg_moreira Very Senior Member Posts: 3274 Reg: 10-06-03. He has a 327 with 62cc 2.02 world heads and flat tops with valve releifs. Ever since, many technicians have felt that it was necessary to add a dab of antiseize to the spark plug threads due to the dissimilar metals. I like AC delco stuff, but it appears they don't offer a plug for this application. Tighten all cylinder head bolts to between 80 and 90 ft-lb of torque. A torque wrench is always recommended for tightening spark plugs and is an absolute must for an aluminum head. Get the advice and know-how you need to complete that next … See ignition manufacturer recommendations to determine spark plug gap. Skip to the end of the images gallery. Some heads are almost identical, the only significant s=difference being the type of spark plug used, so be sure to inspect the head closely to be sure the right plug is used. ft. 12mm: 10-18 lb. A well designed spark plug might be made of an alloy that reduced galvanic corrosion but it's unlikely to eliminate it altogether. Here are some of the details: Rear wheel hp 360 Rear wheel torque 390 MSD 6AL box, MSD distributor and wires Aluminum Procomp heads 10-1 compression 91 … Search Car Torque Specifications by Engine or Model. Torque Spec Database. I have relatively mild street 400/500 stroker motor. I’ve never torqued them either Champion Auto Parts | Replacement & Aftermarket Auto Parts. How To & DIY. No longer necessary as modern spark plug coatings work as a releasing agent and should be installed dry. These large engine parts benefited from their aluminum construction and shed around 100 pounds from the vehicles total weight. Long(er) spark plug change intervals only aggravate the problem. Oct 29, 2017 #1. grubby65 Well-Known Member. May 12, 2014 Roadkill Customs Automotive Basics, Technical Info. I am an old timer and had a 1969 SS 396 that subsequently . What’s more, this set comes as a pack of eight, allowing you to fully replace the spark plugs in your engine, or have some lying around for spares. Tighten each of the 390's spark plugs to between 15 and 20 ft-lb of torque. Spark plugs for the Chevy 350 engine are readily available from any auto parts store. CALL TO ORDER 888-799-1135. Intake Manifold. heat ranges colder. Torque Specifications 10mm Gasket Seat 12mm Gasket Seat NOTE: Spark plugs should be installed with clean and dry threads to avoid over-torqueing. Serious engine damage can follow. The spark plug holes must always be cleaned prior to installation, otherwise you may be torquing against dirt or debris and the spark plug may actually end up under-torqued, even though your torque wrench says otherwise. Add to Wish List. Another EZ Read reference. Spark Plug Torque Recommendations. GM 5.7L-350ci-V8 Engine Torque Specs. Member. Another area that can be problematic is thermostat housing bolts on old iron manifolds due to rust. What I worry about is the bi-metal (steel plug - aluminum threads) where the threads in the heads attach themselves to the spark plug and then get pulled out when removing spark plugs. They use the .750"reach(long thread) gasket seat plug and need the smaller 5/8" head for a socket to fit on. Removing a stuck spark plug without damaging the cylinder head takes time and patience. During the BBC production, the spark plugs changed from gasketed to tapered seat. But if you exert mega force to remove a stuck spark plug, you can also shear off the threads in the aluminum cylinder head, and that’s a MAJOR repair. - - - Updated - - - Am also going to use the low deck Performer RPM intake manifold with this PERF RPM HEAD. Clean the spark plug threads and ensure the cylinder head is clean of debris. good shape. $829.50. EZ Read simple diagram of the Big Block Chevy Cylinder Head Torque Sequence. In the absence of this tool, the table below provides a generic guide to torquing a replacement plug based on the number of turns after the plug becomes finger-tight. I found a bunch of Bosch and Denso stuff that fits. It probably began when aluminum cylinder heads first started showing up in mass-produced vehicles. Important: Apply anti-seize to all spark plugs to ensure a long thread life. Edelbrock says to run the Champion RC12YC (or equivalent) plug in their head (Performer RPM angle plug aluminum). Then tighten the plug as specified below: With a Torque Wrench: Please note there are slight variations in torqueing recommendations between spark plug manufacturers. Torque Specifications for GM 5.7L-350ci-V8: Bell Housing To Engine Block 30 Ft-Lbs 360 In-Lbs 40.67 N-m Years: All Note: Chevy Small Block Type: Dim: Length: Head: Grade: Bell … A stock application that would use the champ plug is a "2003 Chevy Tracker w/2L engine". It may or may not interfere with your radio/electronics,but usually not as bad as solid core wires. I cannot say for sure this is what happened when I've had to put a thread repair kit in the head, but anti-seize will definitely help prevent it. About strippin' the holes, I have something from the world of 4 banger car with aluminum heads and deep plug holes (gimmie a break, ... 1932 heads have a 7/8 - 18 spark plug. ft. It_s_Me. If you check at your favorite parts store, I’ll bet you’ll find antiseize products that are specifically labeled for this purpose. 2. Heads have a .400" valve relief.3-5/16" bore, 4" stroke = 9:1 compression ratio3-5/16" bore, 3 3/4" stroke = 8.6:1 compression ratio. This can distort the metal plug shell, which often results in engine damage. Spark plug gap for Points is .035 and any electronic or MSD is .040-.045 General Guideline- Pump gas street engines would use a -5 to -7 heat range, high compression race engines may use a -8 or -9 heat range, and boosted/nitrous engines may use a -9 or -10 heat range depending on levels of boost/nitrous. Spark plugs for the 350 engine are on the sides of the engine, outside the cylinder heads. In this video, Steve Darnell from WelderUp shows … November 7, 2019 Roadkill Customs How To & DIY. Exhaust Manifold. Unfortunately, the potential for problems increases when high mileage spark plugs are left untouched in relatively soft aluminum cylinder heads. Whether the plugs are steel or some other hard alloy, the aluminum heads are likely to sacrifice to the plugs. Spark Plug Gap. The proper torque of a spark plug can only be achieved using a torque wrench. Depending on the year of the engine, the spark plugs may stick straight out or set at a 35-degree angle. The best torque wrench to get is the kind with the "twist" adjustment because you can't overtighten with these. There is a famous old theory that aluminum heads have more compression ratio because they dissipate more heat, whereas iron heads are able to make more power since the chamber locks in the heat. Anti-seize can alter the tightening torque up to 20%, increasing the risk of breakage. Spark Plug Torque Specifications: Attention: 1. How To Helicoil Damaged Spark Plug Threads . This is the Head Bolt Torque Sequence (Pattern) for the Mark IV Big Blocks, Rat . With longer spark plug life it’s not uncommon to run into a stuck spark plug. Torque directly affects the ability of the spark plug firing end to dissipate heat to the cylinder head. Screw in the spark plug finger tight until the gasket meets the cylinder head. Cylinder Head Bolts. Understanding Aluminum Heads and Spark Plugs . Motors or what ever you might lovingly call the motor. Aluminum heads require parallel ground hardened … Spark Plug seizure in an aluminum cylinder head is usually caused by improper installation and too much torque. Ford Motor has completed substantial dyno testing of Full-Torque inserts to validate and approve their use in aluminum cylinder heads. Aluminum heads use gaskets that are seat-style long reach, whereas iron heads have a tapered seat-style and short reach spark plugs. Messages: 161 Likes Received: 127. Joined: May 26, 2015 Location: Blue Hill Local Time: 2:36 PM. 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