The difference in cubic inches comes from the crank stroke. Instead, it was "Tasca Ford"—the second-largest Ford dealership in the world in the 1960s—that inspired the 428CJ revolution. The 428 Cobra Jet was a performance version of the 428 FE. A true Cobra Jet block will have a C cast in the back the block where the bell housing bolts up. The 428's were a 4.13 bore block and a 3.98 stroke crank. Only show this user. The first step in detailing a 428 Cobra Jet engine is to make sure you actually have one, versus a 390 or standard 428 block. the 429 thunder jet is the base 429 4v. 6 65Custom Registered We have 2 blocks here-both are 428s but one has some additional webbing on the main bearings. The CJ block differs from the plain 428 due to the additional webs cast into the main bearing saddles. The most notable Ford FE-based performance engines are the 427, the 428, and the 428 Cobra Jet. But, from the factory it was never as powerful as the (solid lifter) 427. Ford's legacy of powerful big block V8s dates back to 1958 with the skirted Ford FE Series 332/352ci engines that ultimately grew to 427ci by 1963 and 428ci by 1966. Although it doesn't tell for sure about the block it will confirm whether the crank is a 428 stroke. It was based on the staid 428-cid big-car engine, but had larger valve heads and the race-brewed 427's intake manifold. Show All. That's bull%$#@. The SCJ block is the same as a CJ, and to that they added 427 "LeMans" connecting rods, better intake manifold, and an oil cooler, plus crank, rods, pistons, wrist pins, flywheel/flexplate The 428 Cobra Jet used an external oil cooler as well. The Tasca-tuned combination worked so well that Ford pushed the engine into production Mustangs as the 428 Cobra Jet. There was also the 428 Cobra Jet and Super Cobra Jet; horsepower ratings were the same with both. This '69 Mustang features the legendary 428 cubic-inch Cobra Jet V8 engine option. Both engines are FE series engines but have different characteristics and specifications. The heads and intake were unique to the 428CJ. The 428 was the same Cobra Jet engine offered in the stock big block Mustang. True output for both engines touched 400 horsepower at the very least. Does anyone know the difference between the 428 fe industrial block and the 428 fe cobra jet blocks? The two-barrel 390 was good for 265 horsepower, the four-barrel stepped up to 325, and the Cobra Jet 428 provided just ten additional horses but a fair torque boost to go with it. 428 Cobra Jet. With the Muscle Car horsepower race escalating for the 1968 season, Ford Motor Company introduced its all-new 428-cubic inch Cobra Jet engine. Smith noted that the 428 Thunderbird 7-Litre V-8's engine block actually edges out the later Cobra Jet 428's engine block slightly in strength and thickness--but according . Visit site. The IUA SCJ uses the hatchet crank spacer. Engine Basics. Although it had nearly the same displacement as the 427, the 428 was much easier to build, and it featured a 4.13 inch bore and a 3.98 stroke (compared to the 3.784 inch stroke found in the 427 and the 390). The main bearing journal diameter measures between 2.7484 and 2.7492 inches. Measuring 2.34" X 1.34", the ports were larger than the 427 racing heads. Note the difference in engine speed between the two specs. Most have the 1ub cranks and the good rods. It has been sitting in storage for years and he would like to sell it. Answer: Q: What is the difference between a Ford 427 and 428? I know where there's one right now. One of the easier things to look for is the "C" that is sand-cast in the back of the block, as shown in . Some of the other unique facts about the 428 are that it's externally balanced and due to the different piston and connecting rod combos used by the factory. The 429 was short lived and I will admit that it has more potential than the 428, the project really never left the ground. The differences for the SCJ were: 1) The beefer 427 "LeMans" connecting rods. This combination would have fired the Mach 1 through the ¼ mile in around 14.3 seconds, which is an impressive number. Maybe even throw a little nitrous on top of that 428, and call it a day. It's difficult to convert a standard Ford 390 into a 427 or a 428, but you can stroke it out and push respectable power with the right cam, heads, and a solid fuel and ignition system. A 428 behind the block will have a welded A , a cj and scj will have a C shaped weld on back . The Q-code Cobra Jet 428 was rated at a very conservative 335hp @ 5600rpm. Whenever a . These are a few ways you can tell. 22 Though some claim the 428 CJ actually made in excess of 400 hp, we observed 365.1 hp at 4,800 rpm, almost 10 percent more than advertised. A 429 has a 3.590" inch stroke, and a 460 has a 3.850" inch stroke.just a hair over a 1/4" inch extra stroke. chrlsful. The 428 police interceptor engine could be found on both the 1967 Shelby GT500 and the 1968 GT500KR. This is to offset the heavier LeMans rods used in the SCJ. also, the 428 Police interceptor was pretty good. The 428 CJ and SCJ blocks have extra main bearing webbing and thicker main caps than the normal 390 or 428. As a result, the 428 was less rev-happy but it gained a low-end torque punch that was absent in the 427. The 428 Cobra Jet powered some of the fastest Ford Muscle Cars from 1968-1970 over nine different Ford and Mercury models. The longer stroke (3.98 vs. 3.78 for the 427) gave the engine powerful low-end punch. The 428 Cobra Jet engine used a nodular cast iron block and crankshaft, forged steel piston rods and aluminum pistons. Automotive historians have extensively documented the differences between the violent and brutal Ford 427-cu.in. Not very substantial for racing. I'll bet that you were hoping that we would be lifting the Mustang's hood to reveal the original 428 Cobra Jet V8 and the 4-speed manual transmission. There is a difference between the standard 428 and the 428 Cobra Jet block. The GT500 KR uses two small lift hooks in 1968. . 2000-09-03T19:44. There is a difference between the standard 428 and the 428 Cobra Jet block. The CJ block varies from the plain 428 in that it has extra webs cast into the main bearing saddles, whereas the plain 428 does not. Basically, a 428 is just a stroked 390, and tuned for massive torque over horsepower. V-8 and the refined, velvet hammer Ford 428-cu.in. Because of the long throw, the 428 was more of a low rpm / torque motor were as the 427 was a high rpm race motor. Of these, four of the cars made it to finals, proving the impressiveness of the Cobra Jet engine. I was wondering if anyone knows the difference between a regular 428 block and a 428 Cobra Jet block. Emissions-wise, a pretty dirty motor though. Building Ford's Fabulous 429 Super Cobra Jet. The flow data shown at right shows a comparison between out of the box Edelbrock heads and factory Ford 428 Cobra Jet heads. The 429 was not produced until 1969. Midway through the 1967 model year, the 427 was swapped out for a newer 428 Cobra Jet engine equipped with a Holley four-barrel carburetor. Although the original Ford Mustang was a hit with younger crowds from its inception . 1. The 429? 1970 Ford F100 2WD SB 447 Strokered FE w/ T19 Bullitt390 New Member The 428-4V Cobra Jet was available in two basic forms: with and without Ram-Air. It's amazing the difference between a 428 and 429 cobra jet engine. Actually, rebuilding a 428 using modern methods costs significantly MORE than $2,500. Most 428s have a weld A on the back of the block . And according to Shel there was not a "nut or bolt" difference between them and the non-KR GT500's. "MM: The regular GT500 has a 428 Police Interceptor, and the KR has a Cobra Jet 428 with more horsepower. 428 Cobra Jet Engine Detailing, Part 3 The last two issues, we brought you Part 1 and Part 2 of Marcus Anghel's exhaustive deep dive into how to detail a 428 Cobra Jet engine to concours level. Nov 13, 2013. The SCJ block is identical to the CJ block. The IU was the very first 428 crank to come out in 66 and used till 68 in the std 428,428PI and the 410. The 410 utilized a 390 block and 428 crankshaft and was actually a production standard for some 1966 and 1967 Mercurys. The 410 was a 66-67 Mercury only engine option. Both sets of heads use identical valve sizes, and were both tested with a clay radius on the intake port and a 1 3/4" pipe on the exhaust . Aug 18, 2021 at 1:27pm. The 332-352-360-390-406 428 series of Ford Big Blocks are all essentially the same…They just juggled bore and stroke dimensions…The 427 racing engine is also of this family but has a unique short stroke-big bore design with a completely different crankshaft and heads…Getting 700 HP out of a 428 is largely a dream, the basic design will simply not support it…Cobra Jet and SCJ were . R. . I think the only change I would make to this particular car is to possibly swap in a Tremec T56 Magnum XL 6-speed manual transmission. The SCJ block is the same as a CJ. The scoop mated to a special air cleaner with a vacuum-actuated butterfly valve that funneled air directly . The big reason a 428CJ makes more horsepower and torque than a PI is the superior heads. Launched in April 1968, it was built on a regular production line using a variety of cylinder heads combined with a 735 CFM Holley four-barrel carburetor. I've heard this could be a Cobra Jet but I've also heard this might not be the case. Hell for under $8000 you buy brand new from Ford their . It was the old 428 block with a lot of changes. The connecting rod journal diameter measures between 2.4380 and 2.4388 inches. He bought (what was to told him) a 428 cobra jet engine w/ C6 trans & driveline out of a 69 Gran Torino. Fastest AFR headed BBF on 460Ford.com. . The 428 Cobra Jet has greater low-end torque than the 427, thanks to its longer stroke. "CS: The GT500s had a 428, but there wasn't any less horsepower. Another thing to consider is the 429 'Thunder Jet'. In '69 the 351 was good for either 250 or 290 horsepower, depending on its carburetor configuration, while the four-barrel 390 dropped somewhat to 320. #2. The later IUB CJ and IUA SCJ were 69-70 428 cranks. While 1299 may seem like a lot( compared to the lightweight Galaxies, Thunderbolts, 427 Fairlanes and Boss 429's) it is a small fraction of the numbers . Nascar soon after the release of the 429 put a . 390 heads will have 6090 h stamped between the spark plugs , a 428 will have 6090 -N between spark plugs showing it is a cj . 428? The 428 Cobra Jet is perhaps the best and certainly one of the most popular street performance FE engines. The exhaust valve diameter should be 1.551 to 1.566 inches, with the CJ engine measuring between 1.652 and 1.660 inches. Step 3. . The difference between the earlier and later versions of the pump is the location of mounting points for either generator or alternator brackets. . However, it wasn't Ford Engineers that first developed this impressive powerplant. The Cobra Jet used heavier connecting rods with a 13/32 rod bolt and a nodular iron crankshaft casting #1UB. The early design has an inertia ring that is 0.75" wide with a groove in it. Apr 23, 2008. The 428 Cobra jet. This pump is for a vehicle equipped with a generator. Then, on April 1, came the 1968 Ford Mustang 428 Cobra Jet. The 428CJ also used a superior cast iron intake and better exhaust manifolds. This version was just a 2-bolt 429 with passenger car heads, and was rated at 360 horses. In 1967, Bob Tasca Sr. combined race-proven engineering with factory Ford parts to create a high-performance Mustang supercar dubbed the KR-8. In the quarter-mile, a one-second difference is a lot of car lengths. . The largest differences are that the 427 has a very large bore and, comparitively, short stroke. I went online and got some info on verifying it as a 428 & a CJ by the numbers on the . CJ = D0OR-E, TJ = C8VE, C9VE, D0VE. The 428 unit is maybe worth $100. The 428 CJ and 428 SCJ were the Mach 1's best performance engine options. The CJ block differs from the plain 428 due to the additional webs cast into the main bearing saddles. The 428 CJ/SCJ was a powerhouse for sure, and in the lighter bodies was lightning quick. GT500 KR models all used the Cobra Jet engines. The seller doesn't supply any photos of the engine bay. There's also a chance of the CJ being a 4-bolt, but not all of them were, and 4-bolts sometimes found their way into TJ's. Fastest street legal BBF on 460Ford.com. This engine makes gobs of horsepower at the sacrifice of torque . 428's never had cross bolted mains, unlike the 427 (and a few 406's). The valves are bigger but the real improvement is the exhaust port which is both wider internally and straighter plus higher exit point in the casting. Only show this user. Introduced in 1968, the 428 Cobra . FE Big-Block Forum: Difference between a 428 & a 428 cj . 358.9. The valve stem diameter is 0.371 inches and the valve lifters are hydraulic. Ford claim 335 hp at 5200 rpm for the 428 Cobra Jet versus Huntington's analysis which determined output closer to 410 hp at 5600 rpm. both 427 and 428 are "FE" style engines. The Cobra Jet 428 motors in Mustangs used heads from the 427, plus other enhancements to really put some hair on their chest. cobra jets have bigger ports, valves, and manifolds,the engines are built for more heavy duty performance. A special option available for 1969 in the Cobra Jet Mustang included a 428 with internal modifications. The 428 CJ and 428 SCJ were both rated at 335 horsepower which was a wink-wink - "yeah right" horsepower rating. They have the welbs as well on the inside of the block for cross bolts mains but not drilled yet . The 428 broke many speed and time records which I am unaware that the 429 did any. somewhat less, these were also installed on 70's jet boat motors. The Cobra Jet heads have been given a minor bowl clean-up, but are otherwise stock. Ford warmed up the 428 with nothing more than off-the-shelf parts to achieve the legendary 428 Cobra Jet of 1968. it was used in t- birds,LTDs, and torinos. Another clue this engine was underrated was the smaller 390 V8 with a four-barrel carb was also rated at 335 HP. You would be better off today with new Cobra Jet heads or the new Jon Kaase BOSS 9 aluminum head. It also had ram-air induction and a functional hood scoop. The low riser, revised, 427 heads had huge rectangular ports. Reply. The CJ was an engine option, the SCJ the upgraded version of the 428 CJ was what . Year: 1969 "Q" Code (Cobra Jet) bbl: 4: Cylinders: 8: Power (hp) 335 hp @ 5,400 RPM: Torque (lb/ft) 440 hp @ 3,400 RPM: Compression: