Super Cobra Jet Connecting Rod In the go department, a real grabber (335 horses). 1968 428 Cobra Jet Drag Strip Modifications, 428 CJ Mustangs at the 1968 NHRA Winternationals, Comparison of Major 428 Engine Components, Classic Mustang Warranty Plate/Certification Label Decoder, Cobra Jet Crankshaft (engineering number detail), Super Cobra Jet harmonic balancer counter weight, 1, Super Cobra Jet harmonic balancer counter weight, 2, Super Cobra Jet harmonic balancer counter weight, 3, Super Cobra Jet harmonic balancer counter weight, 4, Super Cobra Jet horn detail (note the jumper wire and reinforcement bracket), Super Cobra Jet horn reinforcement bracket. Right to the end in 1970, the 335hp rating stuck. Unless specifically noted this comparison does not include the parts that are unique to the 428 Super Cobra Jet engine. The Mustang now had company in the ponycar market, and the new Camaro was no slouch. The Super Cobra Jet, available only with a 3.91 or 4.30 rear axle ratio, included additional features. Both the Cobra and Super Cobra Jets had dished cast pistons, and used stronger connecting rods than the standard 428. First, the 1969 price list: April 17, 1969 Mustang Drag Pack Option Description, June 1, 1970 Mustang Drag Pack Option Description, Cobra Jet Connecting Rod The difference in displacement between the two was achieved via stroke, with the 429 checking in at 3.590 . As with most deceptions, the ruse was quickly unmasked as the NHRA factored the 428 CJ into higher classes so it couldn't bully weaker machinery. YES! Get exclusive muscle car content, giveaways, and a FREE Report on 10 of the most powerful muscle cars ever made right to your inboxabsolutely free! The Q-code Cobra Jet 428 was rated at a very conservative 335hp @ 5600rpm. The Ford engineers kept the KR-8 so they could break it down and discover what made it so powerful. The 429 was not produced until 1969. stronger. Tim K, Cobra Make, Engine: Shell Valley- smallblock grenade w/ the pin pulled. The longer stroke (3.98 vs. 3.78 for the 427) gave the engine powerful low-end punch. Basically, a 428 is just a stroked 390, and tuned for massive torque over horsepower. The Fora platform includes forum software by XenForo. They were the be-all and end-all of rods back in the sixties, but metallurgy has far surpassed them today. The axle code in the order image is "8" (which means 3.50:1 open) and the car's data plate has an axle code of "W". Makes you wonder how many were built at the other plants. The big difference was the price (at $622, the 427 cost $188 more than the $434 428 CJ), transmission availability (the 427 was only teamed with the C6 automatic), carburetors (the 427's single. Cobra Jet Crankshaft (engineering number detail) now if your talking 429scj vs. 428 scj i would give the nod to the 429scj. The Ford 428 Super Cobra Jet was only available in the 1969 and 1970 model years. The 428 Cobra and Super Cobra Jets continued for 1970, but there was also a new 429 Cobra Jet now. It is remembered by those who love the Ford Blue Oval, and feared by others who would challenge the cars bearing the Cobra Jet name. For improved high speed reliability, the SCJ used the . Pictures of some of these parts can be found in the component identification section of this web site. Carroll Shelby, famous for his GT350 version of the Mustang as well as for the Cobra, became involved when he decided to produce a big-block version of his Shelby Mustang GT series. While the Cyclone was named the fastest car of the year, having set a world record speed of 189.22 miles per hour at Daytona, the 428 version wasnt the fastest in the quarter-mile, achieving 18th place overall. Although the 390 had been offered in the Mustang, the FE had seen incarnations of up to 428 ci. You might as well lead the way. But there was one thing about the 428 CJ that left everyone puzzled. It came in special Mustangs (and 2 Cougars) in 1969-70. The Mustang had grown bigger than ever, with a weight of nearly two tons. Success at the track meant success at the dealership, and Ford knew this. What makes the 428 Super Cobra Jet engine so super? Initially, Ford limited production to only 50, but later increased that by 250 due to popular demand. Comparison of Major 428 Engine Components, 1968 428 Cobra Jet Drag Strip Modifications, 428 CJ Mustangs at the 1968 NHRA Winternationals, Classic Mustang Warranty Plate/Certification Label Decoder, Cast iron, similar to PI with revised carburetor bore risers, relocated carburetor pad, and radiused riser to upper and lower logs to improve fuel/air distribution, Production 390 GT cast iron light car manifolds, Redesigned high flow, low restriction unique to the 428 CJ, Redesigned dual inlet with hot/cold start-up system. Upgraded C6 with higher shift speed and modified clutch packs, New 6" HG with miminal exhaust restriction mufflers and pipes, Revised for staggered shock absorbers to eliminate reverse gear tramping. It also had improved exhaust manifolds and a 735 CFM carb (a slightly modified 780 with different booster venruris). Hi Keiththis Ford Article isn't the best scan I've ever done but the article is very, Location: Abe Lincolns Birthplace, For the most recent 2018 Ford Cobra Jet, Ford used their modified Coyote variant, the 5.2 L Voodoo. The big-block Chevy had the edge in breathing ability, but this move closed the gap between the two engines a great deal. Though I've seen references to engineering numbers on flexplates, I've never actually seen any kind of stamped or cast number on a flexplate. Two-bolt main block Between 345-360 horsepower 428 Super Cobra Jet Internal structure differences included Lemans type cap screw rods The capscrews were shorter than the 427's to clear the block Externally balanced External engine oil cooler Here is some 429 info I gleaned off the net: First was the base 429, known as the Thunder Jet (TJ). The table below summarizes the part differences between the two engines. Besides I have a reputation now First you have to start with the 428 v.s. If so, please consider sharing a picture. The 428 Cobra Jet powered some of the fastest Ford Muscle Cars from 1968 to 1970, over nine Ford and Mercury models. Technically a midyear offering, the 1968 1/2 CJ combined 427 Low Riser heads, a cast iron copy of the aluminum 390 Police Interceptor intake manifold, the 390 GT's hot hydraulic cam, a healthy 735-cfm Holley four barrel, and streamlined exhaust manifolds to fight off the 396s, 440s and 400s from the competition. Two were offered for 428 Super Cobra Jet before and after that date. Super Cobra Jet horn reinforcement bracket So instead, you have to examine the axle code on the door tag for a V or a W to verify its legit. During the 1970 model year, "DETROIT LOCKER DIFFERENTIAL" appears on the invoice of vehicles that came with a factory Detroit Locker. So there was an overlapping period of perhaps a year from say June 1967 until June 1968 when both types were being made and used, apparently for both CJ and non - CJ applications. In response to the Camaro, in mid-1967 Carroll Shelby created the first Shelby GT500 Mustang. Not too common, maybe a total production of 15,000. Automotive magazines from 1968-1969 recorded eight of the fastest Mustangs, Fairlanes, Cyclones, and Cougars powered by a 428 Cobra Jet and Super Cobra Jet, ranging from 13.23 to 14.40-seconds in the quarter-mile ET with trap speeds of 99.4-106.6 MPH. The CJ had the good heads, cam but had the iron intake. There was a special designation in the database to tell which cars had these installed". Mustang buyers who selected either of the optional 3.91:1 or 4.30:1 rear end gear ratios got more than just an optional axle ratio! The 429 heads were incredibly free flowing, and in reality some of the best Ford big block heads ever created. Some SCJ block had the word "super" stamped on the rear. The 1975 MPC also excludes 1970 from the list of application years for the C9ZZ-13826-A bracket -its only listed for the 1969 Mustang equipped with a 428-4V or Boss 302 engine, but it was also positively used on the 1969 Boss 429 as well! Whenever a . Ford 428s had a different water jacket core which can often be identified by the "428" cast in the bottom of the inner water jacket right under the center freeze plug. The 429 is the same block as the modern 460 sold in Motorsport catalogs. The facts became clear once 428 CJ Mustangs and Fairlanes started running high 13s at the strip with zero preparation. Note that it was not thought to be possible to order an SCJ engine by itself -- the only way to get your hands on an SCJ in a Mustang was to order the optional 3.91:1 or 4.30:1 rear end gear ratios. However, it wasnt Ford Engineers that first developed this impressive powerplant. Required fields are marked *. Yikes, that's huge! 1973-1974 351 Cobra Jets had smaller valves, which resulted in a drop in horsepower on some models to 245. Ranging from common problems info to performance modification guides, we cover everything muscle car. Cobra Jet engines received low-riser heads with a "rough-cast" combustion chamber (2.09int.-1.66ex. The CJ got the standard damper of '68-'76. The 429 is known as a 385 family due, I believe, to the bore size being 385 centimeters. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The 428 was a 4.130 bore and a 3.984 crank. The CJ 428 engine was the top-of-the-line performance option that replaced the former performance heavy-weight 427 CID V-8 in April 1968. It may be possible to mix components if every component of the reciprocating assembly is dynamically balanced, but why bother? valves), and the valves were closer together than on other FE heads so that the CJ . It was powered exclusively by a 428 in either CJ or SCJ fashion. Representation from nearly all Cobra/Daytona/GT40 manufacturers Help from all over the world for your questions Build logs for you and all members Blogs George Anderson of Gessford Machine was kind enough to point me to a page from Ford's "Muscle Parts Description and Interchange" book, a supplement to the original "Muscle Parts" catalog that was published in July 1970, that clearly states that "all 428 engines use "dished" cast aluminum pistons with two sets of eyebrows cast so they can be used in right or left bank". The back of the CJ block should have a "C" cast or welded into the back of it. Typical Cobra Jet Crankshaft Several different cranks were used in 428 CJ and SCJ engines during the course of production. Whereas Shelby had scrapped plans to redesign the 428s intake manifold a notorious choke point Tasca came up with a different idea. There is only one high-performance damper of the latter era: The SCJ damper, which has a heavy inertia ring, much like the LeMans. That didnt happen until 69. (REGISTERED USERS DO NOT SEE THIS POST/AD! Super Cobra Jet harmonic balancer counter weight, 3 Ford created a few high performance variants of the 429, the Boss 429 and the 429 Cobra/Super Cobra Jets. not a chance, the 428 scj would out pull the 460 hands down. Cast iron exhaust manifolds. 428 Police Interceptor, and 429 ThunderJet, used in big luxury cruisers. Note that the reinforcement bracket used with the Super Cobra Jet horn arrangement appears to have been used only during the 1969 model year. The Ford 427 became immortalized in 1966, when Ken Miles piloted it during the 1966 24 Hours of Le Mans (later chronicled in Ford v. Ferrari). However, the original Mustang platform, as popular as it was, could not accept the larger engines Ford already had in its product lineup, because the engine compartment was simply too small. 1999 - 2022 Scott A. Hollenbeck. All Rights Reserved. The SCJ block is the same as a CJ. Come join the discussion about restoration, performance, modifications, classifieds, troubleshooting, maintenance, and more! Register now for free! ). Most 428 Cobra Jet fans have heard of the "Detroit Locker" differential, a positive locking differential that was originally produced by Detroit Automotive Products Corporation (DAPCO) and is now available from TracTech Inc. Originally available in any of the three Mustang body styles--coupe, fastback, or convertible--all '68 CJ Mustangs are highly sought after, even 30 years later. Ford advertised the 428 Cobra Jet's horsepower at 335 (10 less than the Thunderbird) with 440 lb-ft of torque, and whether those numbers were accurate or not they didn't push past the 390 far enough to generate more than passing interest from the Mustang crowd for its inaugural 1968 year. One had spun on the crank bearing and all would have had to be resized, so Bill advised me. Ford really got it right with the 1968 428 Cobra Jet (CJ). The big difference was the price (at $622, the 427 cost $188 more than the $434 428 CJ), transmission availability (the 427 was only teamed with the C6 automatic), carburetors (the 427's single Holley four-barrel rated 600 cfm, 135 less than the 428 CJ), and rated output. The A blocks were made until mid 1968 model year. Cobra Jet Mustang production continued into 1970. With a bore and stroke of 4.36 X 3.59, the 429 has a larger bore but smaller stroke than the 428s. You true FE gurus can add/correct info to the above. YES! Introduced in 1958 for service in fullsize Fords as well as the Thunderbird, the FE had seen a long and colorful career. In 1968, Ford released the first versions of their now famed V8 Cobra Jet engines. I think, but don't remember, that the SCJ would come in cars optioned with the "drag pack.". Very few were ordered because of the popularity of the new Mach 1 package. The chambers were open head, which helped with emissions, and Ford fitted the Autolite/Ford 4300-D 750 cfm 4bbl carburetor to it. Besides the T-Bird, there were Galaxies, Thunderbolt Fairlanes, Mustangs, Torinos, and both the AC Cobra and GT 500 Shelbys. That is, the performance motors were either a CJ or a SCJ. non biased Shelby Cobra related site! The basic strength of the Super Cobra Jet engine is in a more durable reciprocating assembly (crank, rods, pistons, wrist pins, flywheel/flexplate, and harmonic balancer) that was designed to withstand the higher RPM requirements of drag racing. The baddest of them all is the Boss 429. Sold it, big mistake. There were slight differences in the base and higher trim Ford Cobra Jets, yet they were all rated the same 335 horsepower, likely meaning Ford was really sandbagging the numbers the whole time. The Formal Roof versions were the ultimate sleeper, looking like your average everyday grocery getter to any unsuspecting contenders that pulled up next to it at a red light.
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