12/27/2023 0 Comments Cloyes timing chain![]() As with our original story, the vessel was fitted with I /-inch headers, connected to 3-inch, 3-foot long pipes, feeding three-chamber Flowmasters, then to another pair of 3-inch, 3-foot long pipes. Our hopes were to make the 300hp mark with just the TPI heads. Since the engine needed no cam break-in, host John Baechtel, along with crew members Rick Stoner and Steve Abbruzzese, had it on the pump and running in short order. We took the revised Jewel to Westech in Mira Loma, California, the site of our original thrash. We ordered the Performer dual-plane variant, designed to operate in the idle-5,500 rpm window. The Vortec engine was never offered with a carburetor, so no factory intake exists, but Edelbrock offers several designs for this application. The real hang-up is that the intake bolts thread into the heads straight down like many Ford V-8s. The one caveat with the Vortec is a special intake manifold-engineers opted to eliminate the exhaust crossover ports, typically found in the center of the intake surface, and in doing so, they eliminated the four intake bolts normally surrounding these ports. They are so inexpensive that purchasing used cores (of any factory iron casting) and having them rebuilt seems foolish. Because these heads are current production pieces Chevrolet can sell them cheap. Initially, the Vortec's appeal was its 64cc chambers, 1.94/1.50-inch valves, and its price tag: We received a set from Burt Greenwald Chevrolet in Akron, Ohio, for a paltry $395. Indeed, the Vortec's fast-burn chambers brought new technology to the basic small-block Chevy, offering more efficient combustion and allowing for more compression. We would also include GM's 元1 Vortec cast-iron units (PN 12529093) that debuted on light-truck engines in 1996. It seems that our airflow-challenged heads do favor a little more exhaust timing, and the bigger stick probably would have put us over the top while staying within monetary and revolutionary constraints. The straight-pattern stick yielded 3 additional horsepower, but the 224/234, 465/488 grind bumped figures all the way up to 306 hp at 5,500 rpm. King also tested two other cams-the same Summit grinds we were considering. His engine produced 6 more horsepower than ours-a solid indication that our junkyard short-block isn't such a bad idea. King ran it on the dyno with the exact same cam as we did, along with a Holley 650 and a Holley Street Dominator manifold. The result was very similar in spec to the Junkyard Jewel, although it had the advantage of flat-top (rather than dished) pistons. Staffer Matt King tried to better our efforts by actually rebuilding an engine he pulled from the boneyard with a super-inexpensive rebuild kit and budget-minded machine work. They're supposed to email you to let you know but don't be too surprised if you don't get everything you order, with no warning (just found this out with gen3 tie-plate studs: can't install the plate without them, but they still sold me the inserts and nuts (useless without the studs), and refused a return without me paying shipping and a 35% restocking fee).We contemplated the dyno to test these grinds, but then Car Craft upped and did our homework for us. OE timing parts aren't all that expensive, IIRC (I think the OE parts () are cheaper than sealed power (federal mogul) timing parts, actually).īeware: as saturn part supplies dwindle, getsaturnparts has a lot of stuff advertised that is no longer available. I think the sprockets would need to be really worn before the difference was easily noticeable. If the chain is worn enough to warrant replacing, the sprockets will not match the new chain and may even stretch or damage it. If you get a new chain, get new sprockets to go with it: as the chain stretches, the sprockets wear to match it. Im tempted to just get new guides and chain, and leave the rest. I also thought that those guides looked like they were made of cheap plastic too. ![]() I compared the gears to original, and hardly noticed any wear from the 'new' crappy ones. They were about $20 less than Rock Auto for the same set. It was from Amazon, so its an easy return. Its just happened to be the first of my parts to arrive. I'm rebuilding the engine, is the reason for changing it.
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