Dyno Results - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Purs · 02-05-2005, 10:13 PM

OK, I know the plug wires look tacky but I didn't have my wire seperaters with me.... Even so, I had a pretty good day at the dyno. The mill is a pump gas, solid flat tappet, oval port 496. Made 10 pulls. Best numbers were:

586HP @ 5700
600TQ @ 4600

I would've REALLY liked to get that magic 600HP number, but it was raining off and on so the air here wasn't that great... It had over 500 ft/.lbs of torque all the way from 3000 to 6000 RPM's.

I'm pleased with the results for what it'll be used for.

LUV2XCLR8 · 02-05-2005, 10:36 PM

WOW

Staceydude · 02-05-2005, 11:16 PM

Very nice Purs,

Did you build the motor or did someone in DFW area build it?

If so who? If not who did you trust with the machine work?

Thanks

Stacey

ROBBY WHITE · 02-06-2005, 12:28 AM

SWEET WHERE DID YOU DYNO AT MAN THATS ALOT OF MOTOR

Purs · 02-06-2005, 01:45 AM

sorry guys for posting this in the wrong forum, I'm a little tired from up all night with kiddo's then up early and at the dyno most of the day....

Can one of you mod's move it? thanks!

Jeremy_5 · 02-06-2005, 02:57 AM

Brit, your done with your 496 already? Thats awesome!! Your alot quicker than I am.
Do you have any videos of it running?

Purs · 02-06-2005, 10:00 AM

Thanks Jeremy, I'm working on getting the videos posted, maybe by this afternoon.

browndawg71 · 02-06-2005, 02:06 PM

tell us more about this contraption. like cam duration @ 050, and what does the rotating assembly consist of. what are you using for carb. great #s , and i hope you have slicks on whatever your putting that thing in. BIG SLICKS.

Purs · 02-06-2005, 03:59 PM

454 4 bolt block bored .060 over
4.25 Stroke Eagle 4340 forged crank, H beam rods, J/E forged pistons with a 5cc dome (all internally balanced)
Isky Z-55 Solid Flat Tappet Cam .590/.590 lift 254@.050 duration
Isky EDM lifters
Moroso 6 qt. oil pan
Rollmaster double roller timing chain
Professional Products SFI approved balancer
Oval Port 781 heads with 2.25/1.90 valves with MANY hours (not mine) of port work.
Edelbrock Performer RPM intake
Barry Grant 850 Speed Demon (custom worked)
MSD 6AL with GM HEI (no vacuum advance)

haven't bought headers yet, but will have 3" exhaust.

can't think of anything else.

Big Bad 1972 Blazer · 02-06-2005, 04:32 PM

Purs...sweet set up. You're numbers are good to see because I'm finishing up a 496 block built in almost the same manner. The only differance is that I'm running a set of Keith Black pistons with a .135 dome (9.5:1 w/ a set of 049 casting heads), a Comp Xtreme energy cam with .555 of lift, and a 770cfm Holley Truck Avenger carb. I gave up a little high end for throttle response & mid range performance, so I probably won't hit your bogey...but with some good air and a few other tweeks up the sleeve, who knows.

I'm finishing up my block in a week or so and am having it dyno'd at the shop right after it's done. I'll post my results to see how they compare with your set up.

FirstGen · 02-06-2005, 04:36 PM

Sounds like it is begging for some nitrous

Great numbers. Are you planning on running a TH-400? Should expect 480 horse 500 ft-pds. to the wheels, maybe more or less depending on the converter you pick! Then slap you a little 200 shot on that beast!!!

Purs · 02-06-2005, 05:01 PM

Good luck Big Bad Blazer, let us know when you get the results.

FirstGen, you're right. My builder said that these mild pump gas motors LOVE a little N20.... with this all forged bottom end he said he wouldn't think twice about anything under a 200 shot.... I've got the Cheater kit in the garage right now but am planning on waiting for awhile. When I get tired of it at this power level I'll hook it all up.

As far as the tranny, right now I've got a TH350 but don't expect it to live long behind this TQ. I'm keeping my eye out for a good TH400 core or even a 4L80E...

browndawg71 · 02-06-2005, 09:12 PM

i run a 350 behind my 468 and have really been suprised how it held up. mine dynoed at 480 at the wheels on the motor. ive heard a th-350 dont have as much drag either. you combination is a good one , that thing is going to be a tire frier. dont cheap out on the convertor cause your gonna need a good one with that torque.

FirstGen · 02-06-2005, 09:22 PM

A th-350 will hold up for a while without good traction. After a few good launches, kiss that tranny good bye.

browndawg71 · 02-06-2005, 11:44 PM

1.48 sixty foots seems to be hooking pretty good to me!

Purs · 02-07-2005, 12:52 AM

hey browndawg, what are the specs and brand of the converter you run?

FirstGen · 02-07-2005, 01:19 AM

Really, 1.48 sixty foots huh. What are your 1/4 or 1/8 mile times? ET and MPH? How many times you taken it to the track? What is your race weight?

browndawg71 · 02-07-2005, 02:36 PM

purs i run a" off the shelf "tci . ran a b&m but it kept getting looser and looser. picked up about 6 mph when i changed.FirstGen, i probably have over 50 runs on this combo. weight is 3770 w/out me in it, im 260. best et 6.80 @ 101mph on 200shot (pump gas) and driven through the gate. ran it once at thunder valley in OK. 1/4 was motor pass 12.50@107 w/ slipping ass convertor. dont get to run 1/4 much as the nearest track is 2 hrs away.

FirstGen · 02-07-2005, 02:42 PM

Nice times. I was gonna say no way you could pull off 101 mph in the 1/8 with 480 rwhp at 4000 pounds. 6.80's are fast no doubt. I'm very surprized that you still have a tranny, maybe you got a freak th-350.

02-05-2005, 10:13 PM	#1
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	Dyno Results OK, I know the plug wires look tacky but I didn't have my wire seperaters with me.... Even so, I had a pretty good day at the dyno. The mill is a pump gas, solid flat tappet, oval port 496. Made 10 pulls. Best numbers were: 586HP @ 5700 600TQ @ 4600 I would've REALLY liked to get that magic 600HP number, but it was raining off and on so the air here wasn't that great... It had over 500 ft/.lbs of torque all the way from 3000 to 6000 RPM's. I'm pleased with the results for what it'll be used for. Attached Images __________________ "Experience is what you get when you didn't get what you wanted." Last edited by Purs; 02-05-2005 at 10:19 PM.

02-05-2005, 10:36 PM	#2
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,476	WOW __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

02-05-2005, 11:16 PM	#3
Staceydude Registered User Join Date: Jun 2004 Location: DFW Area Texas Posts: 436	Very nice Purs, Did you build the motor or did someone in DFW area build it? If so who? If not who did you trust with the machine work? Thanks Stacey Last edited by Staceydude; 02-05-2005 at 11:18 PM.

02-06-2005, 12:28 AM	#4
ROBBY WHITE ZOIE AND ZACK Join Date: Dec 2003 Location: ABILENE, TX. Posts: 212	SWEET WHERE DID YOU DYNO AT MAN THATS ALOT OF MOTOR __________________ AMERICAN BULLDOGS AND CHEVY TRUCKS 71 1/2 SUBURBAN 402BB IN PROGRESS 90 1/2 TON SILVERADO 02 1/2 SUBURBAN 67 GMC 1/2 TON LONGBED 05 AVALANCHE

02-06-2005, 01:45 AM	#5
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	sorry guys for posting this in the wrong forum, I'm a little tired from up all night with kiddo's then up early and at the dyno most of the day.... Can one of you mod's move it? thanks! __________________ "Experience is what you get when you didn't get what you wanted."

02-06-2005, 02:57 AM	#6
Jeremy_5 Truck addict Join Date: Sep 2003 Location: Lincoln, California Posts: 497	Brit, your done with your 496 already? Thats awesome!! Your alot quicker than I am. Do you have any videos of it running? __________________ 1956 Chevy Napco 1972 Cheyenne Super 1970 K20

02-06-2005, 10:00 AM	#7
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	Thanks Jeremy, I'm working on getting the videos posted, maybe by this afternoon. __________________ "Experience is what you get when you didn't get what you wanted."

02-06-2005, 02:06 PM	#8
browndawg71 Registered User Join Date: Jun 2004 Location: paris, texas Posts: 235	tell us more about this contraption. like cam duration @ 050, and what does the rotating assembly consist of. what are you using for carb. great #s , and i hope you have slicks on whatever your putting that thing in. BIG SLICKS. __________________ every man must believe in something, i believe ill have another beer!

02-06-2005, 03:59 PM	#9
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	454 4 bolt block bored .060 over 4.25 Stroke Eagle 4340 forged crank, H beam rods, J/E forged pistons with a 5cc dome (all internally balanced) Isky Z-55 Solid Flat Tappet Cam .590/.590 lift 254@.050 duration Isky EDM lifters Moroso 6 qt. oil pan Rollmaster double roller timing chain Professional Products SFI approved balancer Oval Port 781 heads with 2.25/1.90 valves with MANY hours (not mine) of port work. Edelbrock Performer RPM intake Barry Grant 850 Speed Demon (custom worked) MSD 6AL with GM HEI (no vacuum advance) haven't bought headers yet, but will have 3" exhaust. can't think of anything else. __________________ "Experience is what you get when you didn't get what you wanted." Last edited by Purs; 02-06-2005 at 04:24 PM.

02-06-2005, 04:32 PM	#10
Big Bad 1972 Blazer Registered User Join Date: Jan 2005 Location: Armada, MI 48188 Posts: 83	Purs...sweet set up. You're numbers are good to see because I'm finishing up a 496 block built in almost the same manner. The only differance is that I'm running a set of Keith Black pistons with a .135 dome (9.5:1 w/ a set of 049 casting heads), a Comp Xtreme energy cam with .555 of lift, and a 770cfm Holley Truck Avenger carb. I gave up a little high end for throttle response & mid range performance, so I probably won't hit your bogey...but with some good air and a few other tweeks up the sleeve, who knows. I'm finishing up my block in a week or so and am having it dyno'd at the shop right after it's done. I'll post my results to see how they compare with your set up.

02-06-2005, 04:36 PM	#11
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	Sounds like it is begging for some nitrous Great numbers. Are you planning on running a TH-400? Should expect 480 horse 500 ft-pds. to the wheels, maybe more or less depending on the converter you pick! Then slap you a little 200 shot on that beast!!! __________________ 1968 C10 build in process TT LSA/6L90e/9"

02-06-2005, 05:01 PM	#12
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	Good luck Big Bad Blazer, let us know when you get the results. FirstGen, you're right. My builder said that these mild pump gas motors LOVE a little N20.... with this all forged bottom end he said he wouldn't think twice about anything under a 200 shot.... I've got the Cheater kit in the garage right now but am planning on waiting for awhile. When I get tired of it at this power level I'll hook it all up. As far as the tranny, right now I've got a TH350 but don't expect it to live long behind this TQ. I'm keeping my eye out for a good TH400 core or even a 4L80E... __________________ "Experience is what you get when you didn't get what you wanted." Last edited by Purs; 02-06-2005 at 05:03 PM.

02-06-2005, 09:12 PM	#13
browndawg71 Registered User Join Date: Jun 2004 Location: paris, texas Posts: 235	i run a 350 behind my 468 and have really been suprised how it held up. mine dynoed at 480 at the wheels on the motor. ive heard a th-350 dont have as much drag either. you combination is a good one , that thing is going to be a tire frier. dont cheap out on the convertor cause your gonna need a good one with that torque. __________________ every man must believe in something, i believe ill have another beer!

02-06-2005, 09:22 PM	#14
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	A th-350 will hold up for a while without good traction. After a few good launches, kiss that tranny good bye. __________________ 1968 C10 build in process TT LSA/6L90e/9"

02-06-2005, 11:44 PM	#15
browndawg71 Registered User Join Date: Jun 2004 Location: paris, texas Posts: 235	1.48 sixty foots seems to be hooking pretty good to me! __________________ every man must believe in something, i believe ill have another beer!



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02-07-2005, 12:52 AM	#16
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	hey browndawg, what are the specs and brand of the converter you run? __________________ "Experience is what you get when you didn't get what you wanted."

02-07-2005, 01:19 AM	#17
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	Really, 1.48 sixty foots huh. What are your 1/4 or 1/8 mile times? ET and MPH? How many times you taken it to the track? What is your race weight? __________________ 1968 C10 build in process TT LSA/6L90e/9"

02-07-2005, 02:36 PM	#18
browndawg71 Registered User Join Date: Jun 2004 Location: paris, texas Posts: 235	purs i run a" off the shelf "tci . ran a b&m but it kept getting looser and looser. picked up about 6 mph when i changed.FirstGen, i probably have over 50 runs on this combo. weight is 3770 w/out me in it, im 260. best et 6.80 @ 101mph on 200shot (pump gas) and driven through the gate. ran it once at thunder valley in OK. 1/4 was motor pass 12.50@107 w/ slipping ass convertor. dont get to run 1/4 much as the nearest track is 2 hrs away. __________________ every man must believe in something, i believe ill have another beer!

02-07-2005, 02:42 PM	#19
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	Nice times. I was gonna say no way you could pull off 101 mph in the 1/8 with 480 rwhp at 4000 pounds. 6.80's are fast no doubt. I'm very surprized that you still have a tranny, maybe you got a freak th-350. __________________ 1968 C10 build in process TT LSA/6L90e/9"

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