496 to be DYNO'D! - Page 6 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pistonbroke800 · 06-05-2013, 10:44 PM

What dates are you planning to run in the Hat or Edmonton? If it works in my schedule I would like to take a trip to see your truck run. I'm thinking pretty hard about a 496 for my '81 shorty

69GMC910 · 06-06-2013, 12:52 AM

We had planned to do a pre-wedding drag race competition in the Hat on June 28th for my brothers wedding... However, he has cancelled that as he wouldn't want something to go wrong etc and put a damper on his big day... Unfortunately that kinda works for me as I have been unable to take time off work to get the truck completed... It is driving me nuts, believe me..... I'd hate to pay someone to finish what I have started, but that may happen... Best case scenario I am looking at mid July....

gofastnut · 06-07-2013, 02:50 PM

.......Me likey!!!!

69GMC910 · 07-18-2013, 08:00 PM

It's ALIVE!

http://youtu.be/p_5oqgGit8U

mud.man.rj · 07-20-2013, 12:49 AM

Sounds like a big block should...Nasty.

69GMC910 · 07-20-2013, 12:51 AM

Ugh! I know! Still have right ear pain!!! Lol!
Posted via Mobile Device

mud.man.rj · 07-20-2013, 12:57 AM

So perfect then just like every engine I build...open header start up and 20 min run also for cam breakin, then ...say what

69GMC910 · 07-20-2013, 12:58 AM

Exactly!!! Didnt plan all the tools being shook off the work benches, but I guess that goes with havin a nasty bbc!
Posted via Mobile Device

mud.man.rj · 07-20-2013, 01:02 AM

Final part is when it still sounds Nasty with exhaust on it...then it really is and sure yours is by the sound of it.

QuickStyle · 07-21-2013, 03:31 PM

what made you choose the afr 265's over the 305's? im in a debate right now with myself on which to choose, i have a similar setup 496 @ 10.2, cam not chosen yet, but shooting for around 238/238 @ 050 with around .600 lift. i was leaning toward the 305's til i seen this thread, you made some good numbers with the 265's.

69GMC910 · 07-21-2013, 04:12 PM

Mark Jones, the builder at VortecPro, insists that the velocity of the air through the runners is the key. I told him what my plans for the truck were(85% street/15% track) , he told me what he would build for me. I'll easily run power brakes, and still be capable of decent track time... Which I can not wait to do!!!
Posted via Mobile Device

QuickStyle · 07-21-2013, 08:04 PM

ya definitely velocity is key. i just thought 265cc on a 496 would fall on its faces in the 5k range, but your dyno says otherwise, i think i will go with the 265's. did you do any port work on the heads or was it straight bolt on from the box?

69GMC910 · 07-21-2013, 08:14 PM

Mark ported the heads. He says I can take it to 6500 if I so desire.
Posted via Mobile Device

Super73 · 07-21-2013, 08:56 PM

Any idea what cc they were when they left his shop?
I assume he kept the stock valve?
Any flow numbers?
Posted via Mobile Device

69GMC910 · 07-21-2013, 09:07 PM

Yes he did use the stock valves. I believe from his post that 270cc was what he ended up with. Here are the flow numbers Mark provided.

Flow @ 28 inches, 4.310 bore. .200 171 .300 233 .400 281 .500 317 .550 323. 270 CC runner.
Posted via Mobile Device

Super73 · 07-21-2013, 11:15 PM

Numbers are interesting. I would assume box stock the heads must have flowed less on his bench then AFR advertises? Even same pressure and bore, after the work, they show roughly 12cfm less on the average at every lift point except .200 where the show only 1cfm less.

Lift --- AFR --- Vortec
.200 - 172 --- 171
.300 - 245 --- 233
.400 - 295 --- 281
.500 - 326 --- 317
.550 - 335 --- 328

Regardless of what the flow bench says, your motor makes good power and can't wait to see you bring in a 10 second time slip.
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QuickStyle · 07-21-2013, 11:17 PM

i was going to say that same thing, the stock numbers show higher flow numbers, maybe its cause they are 80% cnc ported already?

69GMC910 · 07-21-2013, 11:26 PM

Hopefully see the track in August. There will be no slicks this year in the budget, but I do hope to run some half decent times on the sportsman s/r's.
Posted via Mobile Device

Super73 · 07-21-2013, 11:35 PM

You will have to let the mph tell you its real potential.

What's your truck weigh?
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69GMC910 · 07-21-2013, 11:51 PM

I really have no idea. Everything is basically stock equipment. Guessing 4000-4200ish?
Posted via Mobile Device

69GMC910 · 08-31-2013, 08:49 PM

I'm gonna try to get it home on Monday. Two hour drive, open headers, wish me luck!
Posted via Mobile Device

mud.man.rj · 09-01-2013, 02:25 AM

Man I am deaf from breaking in all my engine builds with open headers...but driving for 2 hours ..wow... say WHAT can'y hear you, just see your lips moving.

Arekusu · 09-13-2013, 01:34 AM

Update... Vid?

Alex

69GMC910 · 09-15-2013, 11:11 PM

Posted via Mobile Device

Got her home today... 80 miles, open headers with 3 foot extensions.... Cpu down and can't upload video from phone for some reason... Ran strong, cool, and smooth. Hopefully getting exhaust done tomorrow...
Posted via Mobile Device

69GMC910 · 09-15-2013, 11:13 PM

Posted via Mobile Device
Posted via Mobile Device

06-05-2013, 10:44 PM	#1
pistonbroke800 Registered User Join Date: Feb 2010 Location: Airdrie AB Posts: 55	Re: 496 to be DYNO'D! What dates are you planning to run in the Hat or Edmonton? If it works in my schedule I would like to take a trip to see your truck run. I'm thinking pretty hard about a 496 for my '81 shorty

06-06-2013, 12:52 AM	#2
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! We had planned to do a pre-wedding drag race competition in the Hat on June 28th for my brothers wedding... However, he has cancelled that as he wouldn't want something to go wrong etc and put a damper on his big day... Unfortunately that kinda works for me as I have been unable to take time off work to get the truck completed... It is driving me nuts, believe me..... I'd hate to pay someone to finish what I have started, but that may happen... Best case scenario I am looking at mid July.... __________________ 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

06-07-2013, 02:50 PM	#3
gofastnut Registered User Join Date: Feb 2011 Location: Williams, CA Posts: 760	Re: 496 to be DYNO'D! .......Me likey!!!! __________________ Jeff 96 C3500 Crew Cab Long bed (Waiting on Cool Name) 64 C-10 shortie stepside, "Ole Brownie" C-10 Club My achingly slow build: http://67-72chevytrucks.com/vboard/s...d.php?t=508345

07-18-2013, 08:00 PM	#4
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! It's ALIVE! http://youtu.be/p_5oqgGit8U __________________ 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

07-20-2013, 12:49 AM	#5
mud.man.rj Registered User Join Date: Dec 2011 Location: Creighton Sask. Canada Posts: 4,121	Re: 496 to be DYNO'D! Sounds like a big block should...Nasty.

07-20-2013, 12:51 AM	#6
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Ugh! I know! Still have right ear pain!!! Lol! Posted via Mobile Device __________________ 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

07-20-2013, 12:57 AM	#7
mud.man.rj Registered User Join Date: Dec 2011 Location: Creighton Sask. Canada Posts: 4,121	Re: 496 to be DYNO'D! So perfect then just like every engine I build...open header start up and 20 min run also for cam breakin, then ...say what

07-20-2013, 12:58 AM	#8
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Exactly!!! Didnt plan all the tools being shook off the work benches, but I guess that goes with havin a nasty bbc! Posted via Mobile Device __________________ 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

07-20-2013, 01:02 AM	#9
mud.man.rj Registered User Join Date: Dec 2011 Location: Creighton Sask. Canada Posts: 4,121	Re: 496 to be DYNO'D! Final part is when it still sounds Nasty with exhaust on it...then it really is and sure yours is by the sound of it.

07-21-2013, 03:31 PM	#10
QuickStyle Registered User Join Date: Feb 2010 Location: Bakersfield, CA Posts: 18	Re: 496 to be DYNO'D! what made you choose the afr 265's over the 305's? im in a debate right now with myself on which to choose, i have a similar setup 496 @ 10.2, cam not chosen yet, but shooting for around 238/238 @ 050 with around .600 lift. i was leaning toward the 305's til i seen this thread, you made some good numbers with the 265's.

07-21-2013, 04:12 PM	#11
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Mark Jones, the builder at VortecPro, insists that the velocity of the air through the runners is the key. I told him what my plans for the truck were(85% street/15% track) , he told me what he would build for me. I'll easily run power brakes, and still be capable of decent track time... Which I can not wait to do!!! Posted via Mobile Device __________________ 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

07-21-2013, 08:04 PM	#12
QuickStyle Registered User Join Date: Feb 2010 Location: Bakersfield, CA Posts: 18	Re: 496 to be DYNO'D! ya definitely velocity is key. i just thought 265cc on a 496 would fall on its faces in the 5k range, but your dyno says otherwise, i think i will go with the 265's. did you do any port work on the heads or was it straight bolt on from the box?

07-21-2013, 08:14 PM	#13
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Mark ported the heads. He says I can take it to 6500 if I so desire. Posted via Mobile Device __________________ 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

07-21-2013, 08:56 PM	#14
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: 496 to be DYNO'D! Any idea what cc they were when they left his shop? I assume he kept the stock valve? Any flow numbers? Posted via Mobile Device __________________ ------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

07-21-2013, 09:07 PM	#15
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Yes he did use the stock valves. I believe from his post that 270cc was what he ended up with. Here are the flow numbers Mark provided. Flow @ 28 inches, 4.310 bore. .200 171 .300 233 .400 281 .500 317 .550 323. 270 CC runner. Posted via Mobile Device __________________ 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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07-21-2013, 11:15 PM	#16
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: 496 to be DYNO'D! Numbers are interesting. I would assume box stock the heads must have flowed less on his bench then AFR advertises? Even same pressure and bore, after the work, they show roughly 12cfm less on the average at every lift point except .200 where the show only 1cfm less. Lift --- AFR --- Vortec .200 - 172 --- 171 .300 - 245 --- 233 .400 - 295 --- 281 .500 - 326 --- 317 .550 - 335 --- 328 Regardless of what the flow bench says, your motor makes good power and can't wait to see you bring in a 10 second time slip. Posted via Mobile Device __________________ ------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

07-21-2013, 11:17 PM	#17
QuickStyle Registered User Join Date: Feb 2010 Location: Bakersfield, CA Posts: 18	Re: 496 to be DYNO'D! i was going to say that same thing, the stock numbers show higher flow numbers, maybe its cause they are 80% cnc ported already?

07-21-2013, 11:26 PM	#18
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Hopefully see the track in August. There will be no slicks this year in the budget, but I do hope to run some half decent times on the sportsman s/r's. Posted via Mobile Device __________________ 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

07-21-2013, 11:35 PM	#19
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: 496 to be DYNO'D! You will have to let the mph tell you its real potential. What's your truck weigh? Posted via Mobile Device __________________ ------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

07-21-2013, 11:51 PM	#20
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! I really have no idea. Everything is basically stock equipment. Guessing 4000-4200ish? Posted via Mobile Device __________________ 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

08-31-2013, 08:49 PM	#21
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! I'm gonna try to get it home on Monday. Two hour drive, open headers, wish me luck! Posted via Mobile Device __________________ 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

09-01-2013, 02:25 AM	#22
mud.man.rj Registered User Join Date: Dec 2011 Location: Creighton Sask. Canada Posts: 4,121	Re: 496 to be DYNO'D! Man I am deaf from breaking in all my engine builds with open headers...but driving for 2 hours ..wow... say WHAT can'y hear you, just see your lips moving. __________________ 1987 Green n Green machine. 5.0 4spd std. 7" lift w 35's.

09-13-2013, 01:34 AM	#23
Arekusu Registered User Join Date: Mar 2008 Location: Tacoma, Wa Posts: 334	Re: 496 to be DYNO'D! Update... Vid? Alex

09-15-2013, 11:11 PM	#24
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Posted via Mobile Device Got her home today... 80 miles, open headers with 3 foot extensions.... Cpu down and can't upload video from phone for some reason... Ran strong, cool, and smooth. Hopefully getting exhaust done tomorrow... Posted via Mobile Device Attached Images __________________ 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

09-15-2013, 11:13 PM	#25
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: 496 to be DYNO'D! Posted via Mobile Device Posted via Mobile Device Attached Images __________________ 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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