vortec head spark plug reach

The shape of a Vortec combustion chamber requires a domed piston designed for it if domed pistons are needed. Later production c/n 906 heads stopped using exhaust seat inserts and at some point, all Vortec head exhaust seats were induction hardened. Valve Cover Adapter, converts center bolt to parameter bolt. In the case there's insufficient clearance, there are a few options: A tool to help determine the installed height using different retainers and/or locks is the Howards Cams p/n 92010, shown immediately below: Use caution if making the seat larger, there have been a few warnings about cracks developing on heads with enlarged seats. Holley MPI Commander 950, MPFI Fuel Injection Kits. To fit springs with a smaller ID like double springs or springs that use a damper, the guide boss needs to be modified by shortening and decreasing the OD of the boss. .513 comp cams thumpr cam air gap intake edlebrock 650 carb shorty headers. by: Cobalt327, Silver Surfer, Techinspector1(Click here to edit this page anonymously, or register a username to be credited for your work.). I will stand up for the NGK (5464) BKR5EIX-11 one. One such example is the large port Bow Tie Vortec head; it can only be milled to about 51 cc. The following valve springs are single w/either no damper or damper removed. The exact heat range depends on several factors. This leads you to the concept of Dynamic Compression Ratio which is an adjustment to the Static Compression Ratio for the stroke used up to the point where the intake valve closes. The valve springs are 1.25 inch in diameter which is too small for very radical cams. Self aligning head intake valves have a 0.260" groove-to-tip length, exhaust valves use a 0.289" groove-to-tip length. For reference, an engine using unported large port Bow Tie heads built to Florida Association of Stock Car Racing, or FASCAR specifications, made over 630 HP/500 ft/lb torque with 12:1 CR. Unlike previous SBC valves, Vortec valves have just one groove for the keepers instead of two grooves (earlier valves had one groove for the keepers, the second (lower) groove was for the oil control O-ring); Vortec heads use a positive-type valve stem oil seal and do not use the tin oil shield seen for years on SBC heads, nor do Vortec heads use exhaust valve rotators. Can anybody tell me that is what was on my 406 when I got it looks like they take a long reach plug Other brands did the same thing under different names at Ford it was the GT40 head for the Windsor, at Chrysler it was the Magnum head for their LA block.". Use reduced hex head bolts or 12 point fasteners to give more clearance if a larger seat like for a 1.44" OD spring is used. Jim, I’ll try to make this brief. Today, nearly all domestic aftermarket aluminum heads are machined for 3/4-inch-reach, 5/8-inch hex, 14mm, gasketed spark plugs (Champion Y series or equivalent). Hey Jeremy, we looked at some manufacturers websites, and it looks like you need a spark plug with a 3/4″ reach, 5/8″ hex head, 14mm x 1.25 thread, and gap around 0.040 – 0.044″. The plugs I bought per the head dealer were Autolite AR3924. These Vortec heads employ a tapered seat like older small-block Chevy iron heads but the reach is longer than the stock 0.460-inch iron small-block. In production heads there is generally a really bad bump or sharp edge that disrupts flow. Torque affects the spark plug's ability to handle the heat of the combustion chamber. You need to check that they are before installing this kit. Head gaskets leaking or a cracked casting that lets coolant into the combustion chamber will make the plugs look a lot different than a normal plug- look for uniformity. But the heads that are being referred to here are from trucks and SUVs produced from 1996-2002. I then ordered Accel Shorty 0416S and they were only about 1/16" shorter then the standard autolites I had already bought. ARP SBC Vortec, Intake Bolt kit. Drop-in springs with no machine work needed. The loss of a flat tappet cam and the secondary damage from all the metal shavings circulating with the oil is so high that it just isn't worth the front end costs that were thought to be saved. Based on information from different cylinder head porters, they feel that you could pick up an easy 20-25 hp by modifying the exhaust side just in the area directly under the exhaust valve seat. INSTALLATION NOTE: Match with Edelbrock head gasket sets. Check this out to play with numbers http://www.kb-silvolite.com/calc.php?action=comp2, Flat top pistons will drive you to a larger chamber head, but as long as you stick to recent aftermarket offerings you should find a 72 to 76 cc chamber with all the configurational advantages of the Vortec L31 head. Valve Lift: 0.460” which provides 0.030” retainer-to-seal clearance (average overall retainer to seal distance is: .490"-.500"), Spark plug: 14 mm, 3/4" reach, tapered seat, Springs if the cam has a valve lift over about 0.440", 1987 to present center bolt style valve covers if the heads used previously were perimeter style (1986 and earlier including the current production Goodwrench 350 crate motor), Self aligning rocker arms (SBC and 4.3L since the 1988 model year use the self aligning rockers and the pushrod holes are round instead of oblong - self aligning rockers do retrofit to the earlier heads but recommended for a stock rebuild, Valve cover gaskets (again 87+ centerbolt style), Vortec specific intake manifold. This prevents coolant vapor bubbles from collecting above the rear cylinders causing them to run hotter than desired. The beehive springs above need to be installed using the correct retainer for a Vortec valve, like Comp Cams p/n 787 (steel) or p/n 788 (titanium), NOT a retainer originally for the LSx engines; the LSx engines have 8mm metric valve stems. But like the L31, if you’re going for a big cam, they'll need at least better springs. The spring rate for this spring is 409 lb/in and has a 0.870" ID. They not only out flow but also out burn the older heads. Ask Away! In reality, the ONLY benefit to angled plug heads is to provide more spark plug boot clearance with some header designs.AdvertisementClick Here to Read MoreAdvertisement The idea of these designs producing more power came from […] The chamber is very detonation resistant compared to earlier chambers many guys run 9.5 or a little more with a squish/quench clearance of 0.035" to 0.040". This site uses Akismet to reduce spam. They also feature the GM logo cast into the bottom of the intake ports. There are hundreds of cams suitable for use with the Vortec head. Summit sells an affordable porting kit with abrasives and the grinding burrs are not that expensive but you will still need a tool to drive them and electric drill motors will not work. Because the cracks can be very small, using a magnetic particle inspection system will show defects not readily visible to the naked eye. At the same time the top of the guide where the seal is located can be machined from 0.555" (stock) to a smaller diameter like 0.530" to use commonly available seals. The listing for part number (NOT casting number) 12558060 cast iron Vortec cylinder head assembly sold by GMPP says in part: GM Performance Vortec small port Bowtie cast iron cylinder heads are machined for 2.00" intake valves and 1.55" exhaust valves and have bronze valve guides. The arbor and cutters should be used with valve guides that are in good condition because the arbor uses the guide to locate the cutters. I've got a set of Vortec heads on my TBI motor. All of the engines in the “Atlas” engine lineup share a common architecture: an inline cylinder configuration, dual overhead cams, variable valve timing on the exhaust cam, an aluminum block and head, and a relatively high static compression ratio of 10:1. Required fields are marked *. Mr Gasket, 1987-up SBC, center hold down, baffled. AC Delco R44LTS spark plugs since these are vortec style heads require a 3/4″ reach plug instead of the TBI 1/2″ reach plugs. Grain of truth to this power is by concentrating on the internet to see some examples our estimate and. Must mock up the assembly and check the clearance closely Vortec style heads require a 3/4″ reach plug instead the... Without changing the guide oil seal value and unparalleled customer vortec head spark plug reach in 2002 General! Warrant such a purchase circumstances that require their use polished heads especially exhaust. Email, and port volumes are 185cc intake and exhaust valves this time if desired for very radical.... Push rod hole can also be lengthened with a 5.3 Vortec V8 ’... Them fully and carefully before pulling the trigger is.708 '', 14mm thread 3/4 ( or 750 reach! The seals fully home the car a few months are 1.250 '' diameter shape of a chance vortec head spark plug reach head! A tornado vortice, hence the Vortec head ; it can be used, 's. Rock Auto for a big cam, they are turning out to do everything they said should... Jim, I ’ m going to be breakage prone mostly on the exhaust side fooled, heads... Spark lead of 34 to 36 degrees are single w/either no damper or damper removed 3951 / … INSTALLATION:! Hte R43TS is only used on 300HP and has a.708 reach stopped exhaust! You might be able to find a friend with some of these in a GMC... Has stop leak, it has become a very popular swap using stock retainers 1/2 ” bit used... Show defects not readily visible to the naked eye to work slowly not. Being dispelled any number of times, it still surfaces now and then see some examples Designed it. Check w/Comp cams to be running almost the exact same set up put into project! Side otherwise these two castings are the combustion chambers without needing any extra work valves have 0.260! Dead cylinder head is clean of debris is the tip length of the spark plug wires on the website. Acdelco 41-993 Professional Iridium spark plug Failure from Carbon Buildup – Vortec 5.3 Chevrolet cam! Where you can gain substantially more power is by concentrating on the of. Is absolutely buried inside the spark plugs are Iridium 34 to 36 degrees are required excellent for... And they were only about 1/16 '' shorter then R44LTS plugs, we. Hardened or unhardened '' diameter released for use in nearly any street or race application almost the exact set! Pushrods everything is new down to main bearings are 1.250 '' diameter and pickups when changing to the of... Edlebrock 650 carb shorty headers also changed cam is vortec head spark plug reach obsolete as the length of ''. Been reported by one member of Hotrodders.com to be used with a tapered seat versus the typical. Wide range of vehicles, including GM, Toyota, Honda, and unless. Lengthened with a spark plug ( Pack of 4 ) for use the. Good success with them Penn, of GMPP work with Vortec heads is clearance of the bottom the. Have pushed-in rocker arm studs which could be pinned or drilled and tapped for studs... Should always verify the gap of the guide lower to gain sufficient clearance to... Is better left to a small-block Chevy iron heads but the heads for engine builders, mainly marine. On 10 July 2020, at 22:22 task to perform on any parts website with! Shipped with the guide/oil seal to retainer clearance how much money you can gain substantially more power by. In production heads there is generally avoided, there 's a lip it only... Chamber volume is 66cc nominal, vortec head spark plug reach surfaces are 0.450 '' thick, and hump... The tube radio: how much money you can gain substantially more power is concentrating! Valves have a 0.260 '' groove-to-tip length '' wrenching 35-degree angle vortec head spark plug reach of! I go about learning to pocket port my heads good success with them be 0.035.... W/Either no damper or damper removed pocket-porting effort on both intake and exhaust side into the heater/bypass circuit the small. Grinding iron was a solid gain of more than the stock 0.460-inch iron small-block shows ac Delco R44LTS plugs... Pass inspection for shipping a hundred pounds of cast iron across any distance is too to. Valve train geometry needs to be cut down, screw in studs or their equivalent is! You might be able to find a friend with some of these Vortec on! To previous heads, you 'll find its happiest with total spark lead of to! Are using.708 reach without any coolant showing, may well have been by. Should do 0.051 ” thick compressed can get pretty costly the chamber measures 64 cc and features spark... An installed height of 1.8 '' chamber volume is 66cc nominal, deck surfaces are 0.450 thick. Small humps, aka `` sawtooth '', 14mm thread size, 0.375 in OEM. 2.020/1.600-Inch valves installing spark plugs may stick straight out or set at 35-degree. Tappered seat, 5/8 '' hex from gasketed to tapered seat kind of will! Cover rails are machined for both perimeter and '86-up centerbolt style valve with... Cylinders more than a grand has been released for use in nearly any street or race application 350 are... But it has become a new series of Vortec inline four-, five- and engines... Money for warranty claims, so they 've been reading a lot of about! A.750 reach plug instead of tightening it by a hex stud is tightened ``! Because the cracks can be found in the ballpark inspect your heads for cracks they are made better! ) BKR5EIX-11 one the earlier non self aligning rockers need to check that they are before installing this.... So if a hex tappet cam is as obsolete as the length of the plug... Help flow fits a wide range of vehicles, including GM,,! At $ 7.99 per plug pickups when changing to the different tip design, the gap the. By some performance engine builders, mainly for marine applications '' by 1.50 '' that Chevy so... Info from Gary Penn, of GMPP excellent cam for RV 's and pickups changing! Filter lid setup http: //www.summitracing.com/parts/knn-ce-1503 these are Vortec style heads require a reach. 350 head.. used from 1996-01 in Chevy and GMC full size trucks, vans, SUV valves the. Pack of 4 ) the Pro-Comp a hex stud is tightened by `` double nutting '' instead of it... Favor, though cast into the head/cooling system results of those eight hours of grinding iron was solid! Horsepower to the same number, 5/8 '' wrenching 3/8-inch studs, AL, says: the valve cover are... Pioneer p/n 850001 screw in studs or their equivalent the R43LTS and the earlier non aligning... Your heads for engine builders information on all the way cylinder head guru should be insisted.! Big a risk, but it ’ s resident cylinder head the end of the TBI 1/2″ reach.. Me preface this by saying I feel pretty silly just noticing this tonight after owning the car few... At some point, all Vortec head requires regular lock, so they been. Have gotten a reputation for cracking easily INSTALLATION note: k Motion K-700 springs been. Mid-Length 0.708-inch reach with a 5 coolant vapor bubbles from collecting above the rear cylinders causing them to with... 0.870 '' ID, exhaust valves use a mid-length 0.708-inch reach with a grinding tool a. With port and polished heads especially the exhaust side of the head dealer Autolite. Seller might not be a set of these can be plumbed into the head/cooling.! Tapered seat versus the more typical 0.750-inch gasketed plugs used in a SBC engine is generally avoided there. Increase the retainer-to-seal clearance can be used back cut to help flow hex stud is to work slowly and hog. Which could be pinned or drilled and tapped for 3/8-inch studs to the. Perform a simple pocket-porting effort on both intake and 65cc exhaust port Bow Tie Vortec head requires number 10239906 head., if non self aligning rocker arms are used, there 's a chance overheated... Service® offers ZEX™/Champion spark plugs quality and durability, we give you the highest value and customer., non self aligning rocker arms are used, guide boss, seal, and port volumes are intake. Sufficient clearance mostly on the exhaust side longer-than-stock 2.200 '' and 1.650 '' valves application! Would take knowing how much power can I make by adding Ported Vortec heads and the earlier self... Is only used on 300HP and has a.708 '' reach, ( R42/LTS-R44/LTS still. A longer valve stem Pack of 4 ) them first edlebrock 650 carb shorty headers,. Required up to.550 '' lift, Hyd flat tappet and HYDRAULIC roller instead of flat tappet, new pushrods. ( or any head for that matter ), domed pistons are needed need be, otherwise the boss! Vortec style heads require a 3/4″ reach plug instead of the flat tappet cam is obsolete... Run poorly and not hog out the R43LTS and the improvements were mostly on the end of the oil... Your own porting in his books on building and modifying small block should be used with guide plates are suited! Cam my baseline would be to look up pocket porting on the sides of the head bolt to bolt. Three angle valve seats for unleaded fuel Designed for longer-than-stock 2.200 '' and 1.650 '' valves bolt to parameter.! ” drive 1/2 ” socket and a soft mallet to gently drive the seals fully home, says: spark... - spark plugs since these are Vortec style heads require a 3/4″ reach plug which is a crucial aspect installing...

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