Olds 425 flex plate crack

The 425 and 455 blocks were essentially the same, with a shorter stroke crank in the 425, but it is a forged steel crank, very desireable. A billet or thicker flexplate does not flex and therefore cannot absorb the allowable tolerances and that, in turn, can cause damage. A vital part of an automobile engine equipped with automatic transmission, a flexplate consists of a piece of thick sheet metal that bolts to the crankshaft and. Submit corrections and additions to this information to the olds faq compiler. The flexplate can crack or warp due to an out of balance engine or torque converter. Strong enough to stay together behind even the highest horsepower applications, these work great for hot street cars as well. Apparently modified to keep within the revised gm bounds restricting midsize cars to engines of 400 cubic inches or less, this new 442 powerplant measured out at. Oldsmobile 400 425 455 2pc rms 166 tooth dna billet sfi flexplate. Home of the quickest and fastest oldsmobile rockets on planet earth. The most common is the misalignment of the gears between the engine and the automatic transmission, causing the flex plate to bend and eventually crack.

We specialize in a widevariety of highquality car parts and accessories for your car, truck or suv. People on the fourm have done the conversion with the mondello kit but i would think mondello would provide exact instuctions if asked. By the way, they have huge rod journals and you can offset stroke these olds 425 crankshafts and have a nice forged stroker crank. If the flexplate is cracked, replace the transmission fluid pump, flexplate. Save on atp automatic transmission flex plate z 425 at advance auto parts.

A cracked flexplate is almost always a sign of other problems. The two oil main galleries in the blocks have plugs in the front behind the timing chain. Remflex exhaust gaskets are extra thick as well as soft and compressable. Gm performance view topic broke my fourth flexplate. When the recyclable component from your old part is returned to us, the charge is refunded to you. Visit our whats new page to get all the latest chevrolet performance news, announcements, and specials. They sometimes will crack from just metal fatigue and vibration. While factory stock plates tend to crack around the crankshaft hub when punished. The olds 455 was introduced in 1968, it was developed from the olds 425, which was a talldeck version of the 330 engine design. Some blocks, before 1977, have their id cast above the right hand center freeze plug, eg. Our new super strong solid flexplate is an awesome value. Speedway has some useful tips to follow that will help speed up the process.

May cause torque converter to wobble and leak oil shortly after install, due to excessive oil seal wear. But of course youll have to use the 425 330 flex plate or flywheel. Sfi approved flexplates for 64 81 300340350 v8 buicks and 231252 v6 buicks. The most common reasons for flexplate replacement are cracks and. Relocate cross member about 1 from original position towards rear. Excessive crankshaft flange runout can also lead to the flex plate to break. Oldsmobile balanced short blocks includes block, crankshaft, connecting rods, forged pistons, piston rings, rodmaincam bearings, flexplate, harmonic balancer. This is a matched rotating assembly, and will be sold together. Remflex gaskets fill voids on warped header flanges and exhaust manifolds. Bds flexplate is designed specifically for modified applications, and can reliably handle up to 1,500 lb. All oldsmobile v8s use a 90 bank angle, and most share a common stroke dimension. If not properly diagnosed it will occur again and often damage to the transmission may follow. By 1968, all olds engines were using a 39 degree cba.

Showing 116 of 17 results oldsmobile 307,330,350,403 small block 6. The teeth around the edges can also break off, causing. I put the weights to the engine side so you dont see themis this right. The constant expansion and contraction of a flex plate over time can result cracks andor shearing of the flex plate. This engine had a forged crank, and was an ideal basis for further performance mods. Proposed the issue was the flex plate rather then the engine. More severe misalignment can break a flexplate in 15,000 to 30,000 miles. Motor maounts will have to be loose and engine raised approx. Check out jeff smiths responce to this and other questions at. Flex plate transmission flex plate autopartswarehouse. Olds should also be noted that this crank will only accept an early fl,uheel or flex plate holt pattern from the 330. Jun 16, 2018 flex plate i hope starter holes both heli coiled flex plate damaged badly in past, hopefully i can just replace it and move on. It has a few thousand miles since the trans rebuild. In 1965 the 400 and 425 cid taller deck height engines were introduced.

They never shipped a 65 442 from the factory with a 425. Speedmaster flexplates are the best on the market, made from 4340 round bar to exact tolerances. Its not a easy task by any means for the average guy to do. The cba also affects the pushrod hole angle in the heads. What can cause a cracked flexplate out of balance engine or torque converter. I think the shifts are setup too hard on the computer causing the flex plates to break actually. Last time i hunted the exhaust, lifters, bearings, only to find out i had to do the damn flex plate and it only had 2030k on it maximum. But in 1968, olds upped the big motor to 455 cubes, via an increase in stroke. Complete kit includes all special bolts and washers for attaching automatic transmission flexplate flywheel to crankshaft. The bdpower 1041221 flex plate is specially designed to handle the torque and horsepower that your 2007. Then when the bob weights, as well as the flex plate and harmonic balancer are installed on the crank.

New, used and rebuilt parts for 6677 ford broncos, 7879 ford broncos and classic ford trucks up to 1996. Clevite 77 oldsmobile highperformance connecting rod. Broken flex plates can not be repaired, they must be replaced. But whatever the cause, a broken flex plate should be replaced immediately to prevent any accidents on the road. Black hood ghetto crackheads gone wild search xvideos. Olds 425 master engine kit 1965 66 67 pistons rings gaskets bearings no cam 4bbl. There are a couple of ways to check for cam bank angle, and if it is a toro 425 block. Pretty much any and everything could and probably did come out of the experimental garage in lansing. Often times, modified engines can crack or even shatter the stock flex plate. A damaged flex plate can create serious expensive damage. In the years between, 39 degrees was used mainly on blocks found in toronados, and 45 degrees was being used everywhere else. The flexibility of the flexplate enables it to adjust to slight misalignments between the engine and the transmission without causing it to crack or. Bad starter drive can cause teeth or ring gear to wear rapidly. Been through this when installing an m21 behind the old 330 that i just pulled out of my car and went through it again this week getting the 400 prepped to go in.

But if you want you can have this cranks journals welded up and then off set ground to a 4. Theres another thin to think about when dealing with the olds 425. Antique cars classics customs hotrods leadsleds roadsters streetrods trucks turbine car 40 31 ford 67 dodge charger 61 chrysler images specs pictures photos. How to install a transmission without a transmission jack easy jeep cherokee xj few tips duration. The job of a flex plate is to allow for expansion of the torque converter as engine rpm increases. We have some of the lowest prices on chevrolet performance parts, chevrolet performance engines, and chevrolet performance transmissions. Ati superplates are neutral balanced for use in internally balanced engines and exceed sfi 29. We help a user get more power with an rare oldsmobile 403 engine. Oldsmobile olds 350 400 455 flexplate flex plate flywheel. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the. A note about common engine displacement among divisions. Upon startup the converter may then seat or not and the weakened flex plate may crack shortly afterwards or it may go months or years before giving up. Hays 14010 hays steel sfi certified flexplate cadillac holley. We offer some of the quickest delivery times to most of the us on ebay.

The 425 olds all came with a beautiful forged crankshaft. Olds didnt cast the displacement into the side of the blocks until they went to the light weight design in 1977. While it may be hard to believe in todays era of corporate engines, each gm division, at least through the mid70s, unlike ford and chrysler, had their own unique engine designs. The early 400 ci also had that same forged crank, but with a smaller bore. Oldsmobile silhouette flex plate flywheel plate genuine. In 1964, oldsmobile came out with a new 330 cid engine. The constant expansion and contraction of a flex plate over time can result cracks. The 65 cutlass 442 could now be equipped with a destroked version of oldsmobile s monster stage ii 425 rocket v8. All 6467 olds v8s 330, 400, 425, excluding the 394 and the 350, had a pin height of 1. Sfi approved solid flexplate 6 bolt neutral balance440.

I had a subaru into the shop one time in which someone had made this mistake and the entire center of the flex plate had peeled clean out followed by the car ceasing to move one inch further. We offer high quality new, oem, aftermarket and remanufactured oldsmobile silhouette flex plate parts. Search our online flex plate catalog and find the lowest priced discount auto parts on the web. The 455 block and 425 block are interchangeable, so if you have a good rotating assembly mainly the good forged crank and rods of the 425 you can always find a decent 455 block and make a 425 out of it. So if you plan on putting the 425 in front of a mt, make sure you get the right flywheel for your early gen ii rocket. The boxwrench engine specs database is a community resource for mechanics of all skill levels to access a reference library of firing orders, distributor rotation directions and blockcylinder numbering as well as torque specs, timing settings and cylinder. The 1977 and newer blocks will have the cubic inches cast in large raised numbers right above the right hand center. Only because old flex plate had cracks where it bolts to crank shaft. Us made 6876 olds 350 400 455 flexplates in stock cutlass442 is all we do. I know demmer ran 425 s in some of their drag cars actually olds engineering test cars, and our 66 w30 mules also had 425 s from time to time.

Ati sfi flexplates for racing automatic transmissions. Sep 30, 2010 the 65 through 67s 442s used a smaller bore version of the olds 425, resulting in 400 cid. This could account for some early 425 s being found, but from the mouths of knowledgeable oldsmobile employees this would not happen. Girdle plate 12 precision steel plate this is the ultimate in main cap support for the 330350403 engines double dutysupports the caps both wayskeeps the caps from moving for use in all sb olds enginesno hp limitations. Oldsmobile did do testing and install different engines andor combinations in some cars, but this was a special build and done outside the shop. Oldsmobile flywheel and flexplates olds rocket parts. On the outer circumference of the flex plate or flywheel is a ring gear the ring. Rattle noise and cracked flexplate 20152018 ford edge ford. Early cranks 330, e400, 425 require an early pattern flexplate. The early pattern has one hole offset ccw about 5 degrees from a perfect hex pattern, whereas the late pattern has that hole, and a second hole as well, offset in the other direction about the same amount.

There are a few things to consider before you select a replacement flexplate for your smallblock chevy engine. Oldsmobile cutlass and olds 442 350 400 455 automatic. A vital part of an automobile engine equipped with automatic transmission, a flexplate consists of a piece of thick sheet metal that bolts to the crankshaft and torque converter. The 1977 and newer blocks will have the cubic inches cast in large raised numbers right above the right hand center freeze plug, eg. Slight misalignment may only cause a single flexplate to break in the life of the vehicle.

Similar in function to a flywheel in manual transmission engines and called a flexplate due to its expansion, or flexing, during the. Hr351 heat riser block off plates these stainless steel plates easily block off the heat riser passages on your stock cylinder heads. The flexplate has cracked twice in the past 6 months. Which is great, but the flywheel bolt pattern is different compared to the later 6890 olds. Olds 350 400 455 flexplate 19681977 supercars unlimited. If you have not yet seen one of these cranks, you will love looking at it. Buy atp z425 automatic transmission flywheel flexplate. Cadillac, chevy, ford, mopar, oldsmobile and pontiac engine applications. Oct 25, 2015 technical which way does a flex plate go. There are a couple of ways to check for cam bank angle, and if it is a toro 425. In this video i talk about a noise coming between the engine and transmission. While all care is taken, any errors or omissions in the item details is unintentional. If you have not yet seen one of these cranks, you will love looking at.

Like loss of power, this symptom could be caused by many factors other. When it develops a crack, it cannot function as intended and one consequence involves a loss of power at high speeds. Carcare vehicleengine search vehicleengine search makemodel search. Flex plate i hope starter holes both heli coiled flex plate damaged. The 2001 toyota rav4 has 1 problems reported for cracked flex platetorque converter. Mondello performance performance oldsmobile parts and. This may occur in worn engines or engine that have been poorly rebuilt. All oldsmobile v8s were manufactured at plants in lansing, michigan. Excessive crankshaft flange runout or end plate can also cause flexplate cracking.