030-inch over forged pistons with floating pins and 1/16 x 3/16-inch low friction rings. Jeff added the block was thermal cleaned and magnafluxed at JGM Performance Engineering, then, bored and honed for the Keith Black. “The engine was dyno’d for camshaft break-in with Driven BR30 oil, then, changed with Valvoline VR1 10w30 weight High Zinc oil, which is something you should do with any flat tappet camshaft in the interest of durability,” Jeff comments. Stock pushrods were also cleaned and reused in the interest of saving money. I opted for better quality OEM and aftermarket parts.” He went on to tell us the stock 1.7:1 stock rocker ratio worked just fine with the grooved rocker fulcrum balls for durability. “A big block Chevy with a 1.7:1 rocker ratio is one of the engines that could have the cam go flat during break-in. They have a separate hardened face at the base of the lifter.”
“I used genuine GM hydraulic lifters because they are in my opinion the only ones to use on a Chevy with a flat tappet cam. They were also machined and assembled with new Howardĭown below, Jeff opted for a good flat tappet hydraulic cam from Howard’s Cams along with GM lifters, which Jeff feels are the best choice.
Rebuilt using Manley stainless steel valves to eliminate the expense of Large oval-port performance cylinder heads for this effort. “I was able to source a pair of 1973 vintage It was aġ980s vintage 454ci truck big-block with small port heads. I grabbed this engine and hauled it back to my shop.”Īs he was tearing the engine apart. This was a junkyard engine and he had only cleaned and painted it with a new intake, timing set, and oil pump.” Jeff goes on to say, “He’s putting it in a body-off full-scale restoration on a 1967 El Camino. “I built this engine for a good friend of mine.
#Big blockblock how to#
Jeff’s going to show you how to make plenty of torque without selling off the farm. We’re with internal combustion technician Jeff Latimer in Los Angeles, California, building more Chevy iron like we’ve always done with this guy. It is so easy to make power with this engine. You can drop it into a classic Chevelle or a C-Series pick-up and scorch the earth at 5,000 rpm. But you don’t have to take this engine to 7,000 rpm to make real power. However, the BBC can also make high-rpm horsepower for the drag strip. The big block Chevy has always been about great low- and mid-range torque-real street power where you need it for the freeway and for the traffic light. GM added the 502/8.2L and 572/9.4L to its aftermarket performance parts division, producing a new family of power stump pullers. The lower displacement 366ci truck engine became the 6.0L. There were also significant improvements to the block. GM changed the valvetrain from stamped steel rockers, to non-adjustable aluminum. The oiling system changed significantly for the better. Four-bolt main caps became standard on all one-piece rear main seal 1991-up blocks, and that’s okay with us too. The block got a one-piece rear main seal for leak prevention. The big block Chevy (BBC) became the Generation V big block. The 396 swiftly led to what already existed in terms of displacement-the 427, which led to the 402 and 454 in 1970.Īt the cusp of the 1990s, GM not only changed the name “Mark” to “Generation,” it also changed the engine. There was also the lesser-known 366 back in the day, which was a low-revving truck engine designed to make good low-end torque. It never got off the ground andīefore you is Chevrolet’s Mark IV big block, which was introduced in 1965 with 396 cubic inches. Tooling, however, GM said no to this one. The Mark III would have been a Packard design and (And, yes, you could actually order one from Chevrolet.)Īnd Mark IIS “Mystery Motors” displacing 409ci and 427ci (the latter was the Most of you who love the Bowtie understand the origins of Chevrolet’s powerful big blocks, which began in 1958 with the W-Series Mark I at 348ci, followed by the legendary 409 in 1961-and later the super rare RPO 427ci Z11 in 1963. It also loves high-revving horsepower, giving you the best of both worlds. You’ve got to love the Chevy big block for its raw ability to make aggressive amounts of bone-crushing torque without breaking a sweat.
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