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10-14-2013, 10:37 PM
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#176 |
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MOTORHEAD!
Join Date: May 2000
Location: Devon AB, Canada
Posts: 849
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Re: 496 to be DYNO'D!
I hope to push 118mph... Next year I hope to launch it from at least 2500...
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82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph |
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10-14-2013, 11:55 PM
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#177 |
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,250
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Re: 496 to be DYNO'D!
That's a good run IMO, especially for the first time out. Congrats.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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10-14-2013, 11:59 PM
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#178 |
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MOTORHEAD!
Join Date: May 2000
Location: Devon AB, Canada
Posts: 849
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Re: 496 to be DYNO'D!
Thank you! It was a rush!
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82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph |
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10-15-2013, 12:02 AM
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#179 |
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Registered User
Join Date: Dec 2011
Location: Creighton Sask. Canada
Posts: 4,121
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Re: 496 to be DYNO'D!
A 140lb weight saving is quite a difference, think 100lbs is a tenth of a second alone.
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1987 Green n Green machine. 5.0 4spd std. 7" lift w 35's. |
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10-15-2013, 01:30 PM
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#180 |
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Registered User
Join Date: Nov 2007
Location: Bay Area, Ca
Posts: 2,841
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Re: 496 to be DYNO'D!
Nice first pass. 118mph should be enough to go mid/low 11's
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------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49 |
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10-18-2013, 08:28 PM
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#181 |
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Registered User
Join Date: Nov 2012
Location: ravenwood, mo
Posts: 709
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Re: 496 to be DYNO'D!
What fuel pump are you running? I'm running an almost identical motor. Did you run a cstraub hyd roller? I've talked to mark and thats what he recommended for me. The guys over on chevelle.com are getting nasty horse power out of the afr heads! My dad said I was stupid for spending that much money on them. Can't wait to get it finished up! I really want to put him in his place. Also, what stall and trans are you running? IE, manual valve body etc..?
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10-19-2013, 11:10 PM
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#182 |
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MOTORHEAD!
Join Date: May 2000
Location: Devon AB, Canada
Posts: 849
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Re: 496 to be DYNO'D!
Holley 12-454-? 170gph. I dunno if Mark got the cam from cstraub. He has been using this cam in this motor for quite a while... He told me a couple months back that the identical engine to mine with more refining is making upwards of 725 now... Mark is always trying to make better power, and is obviously very successful!
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82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph |
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11-19-2013, 08:46 AM
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#183 |
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Registered User
Join Date: Aug 2010
Location: Keller TX
Posts: 836
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Re: 496 to be DYNO'D!
With timing locked out and slicks it may not work as well as you want it to.. Locked Vs unlocked is a whole chevy ford deal.
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62 long box with a little SBC  http://www.67-72chevytrucks.com/vboa...d.php?t=510631 http://good-times.webshots.com/album/561798652HdwqzG |
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11-19-2013, 10:40 AM
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#184 |
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Registered User
Join Date: Aug 2009
Location: Newberry,FL
Posts: 277
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Re: 496 to be DYNO'D!
Actually unlocked is the "ideal" setup since you don't need as much advance down low, but for a strip truck where you spend most of the time in the top end in you power band, the optimum timing does not vary hardly at all with higher rpm so you can get away with locked timing since the motor hardly spends any time in the lower rpms (or none with a high stall TC).
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1970 Chevrolet C-10 w/355sbc  2010 Silverado Daily Driver  1971 Mercedes 280sl project car 
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11-19-2013, 10:50 AM
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#185 |
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Registered User
Join Date: Aug 2010
Location: Keller TX
Posts: 836
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Re: 496 to be DYNO'D!
If the convertor is right and the tires gear ratio and tire size etc works then yes you can keep timing locked however when things are not "perfect" if the engine bogs for what ever reason you are done .. way too much advance for given rpm etc. I would unlock it while you get the set up dialed in then once you are in the ball park then lock it out. But I see a plate on that truck so it does get driven on the street correct??
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62 long box with a little SBC http://www.67-72chevytrucks.com/vboa...d.php?t=510631 http://good-times.webshots.com/album/561798652HdwqzG |
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11-19-2013, 01:04 PM
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#186 |
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Registered User
Join Date: Nov 2012
Location: ravenwood, mo
Posts: 709
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Re: 496 to be DYNO'D!
Well my guess from after talking to mark is that your running an ISKY hyd roller. Thanks for clarifying the fuel pump for me, wanted to be sure I had the right one. As far as the timing goes, a street ride should definitely have the vacuum advance hooked up. However its his motor and the fella who built it for him is more than knowledgeable. If I were guessing, its still timed exactly how it came off the dyno. Just be sure mark knows that your driving this thing out on the street! That little bit of info needs to be relayed to the builder.
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