Real-world dyno numbers are always better than best guesstimates. Unlike all other 425s, this version was painted slate blue metallic. With the 80cc combustion chamber and dished forged pistons the static compression ratio is 9. At Eddies we use hypereutectic pistons, which are cast aluminum pistons with a high silicon content. The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge with flat-topped rather than domed pistons, six bolts rather than five per cylinder, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the shafts and rockers were unique to Oldsmobile. All generation-2 small-block Olds V8s used a stroke of 3.
This very open and flat chamber was fuel efficient and had lower than average emissions output. Next I verified the connecting rod and main bearing clearances were within specification. We also offer 455 custom piston options on these basic stroker kits. All 425 engines were fitted with forged steel crankshafts with harmonic balancers. Part numbers without the B in the part number must be balanced before installation into your engine. A rebuilt engine can return your car to its former glory and bring the roar back to your classic beast. Although production of the 455 ended in 1976, a small number were produced through 1978 for power equipment use, such as , and equipment.
Find a remanufactured 455 motor for your 375 horsepower Toronado or a set of stainless steel hex bolts for your own engine rebuilding endeavors. Because there are so many cylinder heads out there it would be tough to cover all the work we do on them. So I added oil restrictors to the 2, 3, and 4 main oiling passages between the main and cam bearings. Tel: 800-471-2325 Toll Free ; 732-727-2325; Fax: 732-727-3178 Address:. The Oiling System - As you may know there is much more to yoru engines oiling system than just the pan, pump and filter.
I opened up the return holes in the heads, radius the holes, and ground a slight groove in the lifter valley from the heads to the return holes in the block to aid quicker oil return to the pan. This limits the oil going up top and increases the oiling to the mains bearings. The J-2 engine also had a slightly thinner head gasket, raising compression to 10. Camshaft and valve train Because this engine is going to be used as a freeway cruiser with 3. We do sell the cranks, rods, pistons, rings and bearings separately also if you do not need a complete kit.
Basically there are cast iron and cast aluminum heads. This problem did not appear until the engine had over 50,000 miles 80,000 km on it. The 4 barrel versions had a larger diameter harmonic damper, the 2 barrel only a balancer hub without the rubberized outer ring. Four precision drilled restrictors and a custom extended reach pipe tap for making this job easy and effective. The production 455 head we tested at 0. Tests have proven that frictional drag was reduced significantly by pressurizing oil 360 degrees around the back of the cam bearing, and then releasing oil at the three O clock position over the conventional 6 O clock position so commonly found in most non-performance applications. The rule of thumb is.
To find out, Car Craft, in conjunction with Westech Performance, has decided to build up an example of each 455 using commonly available off-the-shelf performance parts. Gaps were oriented per instructions attached above. This engine was built for reliability, streetability, efficiency, and compatibility with fuel injection with an excellent power band. Likely rust from 20 years of sitting with full jackets. With our more advanced engine setups we use the roller rocker to further decrease valve friction.
The engine made more than 500 lb-ft from 3,500 through 4,800 rpm and more than 400 hp from 3,800 through 5,500 rpm, the highest rpm point obtained in the test. The primary purpose of this rebuild was to correct issues, and achieve reliability and longevity. If you would like to substitute different parts in a 455 kit please contact us for assistance. The , likewise a forced induction i. No other years or models were provided with this system.
It kept the retired 425's 4. One of the best and simplest ways to make gobs of frame-twisting torque is with cubic inches. It features a square bore carburetor pad which is an inch and a quarter taller than competitive dual plane manifolds which further enhances the power producing capabilities. The 260 cu in 4. Otherwise, oil can splash and film out of the fill tube. Forged pistons, moly rings, and clevite bearings finished off the rest of the bottom end along with balancing everything before installation. Big-block and versions also increased the 2.
While more pressure tends to help the lubrication of your engine it is important to point out that too much pressure requires more engine power to create. It was optional on 1964 and. This is specific to the lifter and rocker arm manufacturer. Lookin to make some noise and have a little fun. A 5-speed manual transmission was also available with some 260-equipped vehicles.