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#521
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Where are all of the '66 and '67 427 Chevelles? I remember seeing a few of them advertised in the 80's from Auto Trader magazines in South and North Carolina, but you never see them in the wild anymore. I'm sure they were all dealer specials, but I absolutely love the SS427 emblems on a '67 Chevelle, and really, Chevy should have made those from factory.
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1968 Camaro Ex-ISCA Show Car John 10:30 |
#522
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What size are these rear tires?
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#523
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The Cragars have ProTrac L60s. 275/60-15. Bias Ply available through Coker Tire
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69zee (04-13-2024) |
#524
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Chuck_Burg (04-16-2024) |
#525
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The box means a lot to me.... way too large for my small garage but kind of like an heirloom. |
#526
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On Tuesday, July 2nd, I brought the Camaro to Westech Performance for a dyno day. Before going, I eliminated the rear power valve and upped the secondary jetting to 88s and put 80s in the primary. I also put a new set of plugs in the engine.
The first pull showed the engine was rich, low 11 air/fuel. We swapped in 85 jets into the rear and dropped the primaries to 77s. This yielded a nice conservative 12:1 AFR. The main reason for going to the dyno was to make sure the AFRs were safe at WOT throughout the RPM range. Most pulls were done through the exhaust with the cutouts closed. After the jet change and playing with timing, we discovered 34 degrees total timing was the sweet spot! Through the exhaust the engine delivered 424hp and 454lb/ft at the rear tires. With the cutouts open, it made 433hp and 474lb/ft! No only were the peak numbers higher with the exhaust opened up, but the torque curve was even more impressive! It gained substantial torque throughout the curve. Peak power was made at 5,365 rpm, but does carry pretty nice for GM 781 oval port head out to 6000rpm where it still made 420hp. I was really pleased to see this because the engine would fall on its face at 5500rpm with the old fuel system, it just didn't want to go any higher... I should've known there was fuel delivery issues from day one! Even though the numbers aren't earth shattering I am pretty happy considering this is a pump gas, "781" iron headed 496 with an out of the box stock 1970s era Edelbrock Tarantula intake, a very mild hydraulic roller cam, 9.2:1 compression, and an 850 Holley. The guys at Westech really liked the car and were pretty blown away with the vintage speed parts on the car, especially the points ignition ![]() |
The Following 6 Users Say Thank You to Chuck_Burg For This Useful Post: | ||
1-slow-camaro (07-06-2024), big gear head (07-06-2024), napa68 (07-05-2024), olredalert (07-06-2024), scuncio (07-05-2024), SuperNovaSS (07-08-2024) |
#527
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Here is the overlay on the screen, black lines are with the cutouts open and red lines indicated closed exhaust cutouts.
Last edited by Chuck_Burg; 07-05-2024 at 06:36 PM. Reason: add more info |
The Following 7 Users Say Thank You to Chuck_Burg For This Useful Post: | ||
1-slow-camaro (07-06-2024), 1967Z28 (07-06-2024), big gear head (07-06-2024), dykstra (08-27-2024), jbtech (07-06-2024), L_e_e (07-05-2024), olredalert (07-06-2024) |
#528
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The thing carries at least 400lbs of torque from 2900 to 5400 at the tire???
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Chuck_Burg (07-05-2024) |
#530
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Way cool Chuck!
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Dave Dykstra 1968 Camaro Palomino Ivory/Ivy Gold interior -Delivered to Courtesy Chevrolet, Los Angeles, CA 2013 Corvette Grand Sport 60th Anniversary Edition Arctic White/Diamond Blue interior -Delivered to Bill Jacobs Chevrolet, Joliet, IL NCRS#66003 “Education is what you get when you read the fine print. Experience is what you get if you don’t.”-Pete Seeger Dykstra Motorsports |
The Following User Says Thank You to dykstra For This Useful Post: | ||
Chuck_Burg (07-06-2024) |
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