what do you think it will run in the 1/4?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**americanmusc1e** · 07-29-2010, 07:49 PM

383: vortec heads, wieand stealth, Holley 600, Comp 268 cam (268/280 advertised 224/230 @.050 .509/.512 lift with 1.6 rockers), H-beam rods, scat 3.75" crankshaft, .060 over 350 block, electric fans.

30* total timing

700r4. shifting at 5000rpm

3.73 gears no posi, 30" tires (it will hook on dry concrete, but not on blacktop)

1970 C10 long fleet

haven't taken it to the track yet but It beat a 14.2 Nissan Titan

cableguy0 · 07-29-2010, 07:57 PM

First put some more timing it. Get it up near 36 total. You likely have more rpm left in it too. You should be making power to at least 5500rpm with that combo. I would guess and say maybe a 13.8 its almost impossible to guess at a 1/4 mile time though without a dyno sheet.Do you have a stall converter?

AirMale · 07-31-2010, 04:15 PM

NO POSI? First get a posi and 13's should be easy. Practice helps too.

shortbed70 · 07-31-2010, 05:38 PM

Peg leg and 700 will probably make a smoke show stripe through first so you will probably have to baby it out of the hole. My 65 swb with a 361 sbc hates traction on almost anything with stock suspension. I have 3.73 gear,26" tire 25-2800 stall convertor.

**americanmusc1e** · 08-02-2010, 07:19 PM

on cement (not blacktop) with warm tires the truck will hook hard enough to flex the front left suspension all the way up and send everthing that was on my dash to the floor. I think it's hooking because I have a stock stall converter though. (1000rpm stall with my foot on the brake.

)

desktop dyno says my truck makes peak HP at 5000, so that's where I've been shifting it

next I plan on getting it dyno-tuned, then stall, then posi

Marv D · 08-05-2010, 09:21 PM

I personally think DeskTop Dyno is somewhat generous on HP and Torque estimates, but the actual number doesn't mean much,, it's just a number. Instead of shifting at the HP peak, I'd try shifting to put the AFTER THE SHIFT rpm in the meat of the torque curve.

Bowlin and Gripos site has a 'optimium shift calculator' to play with. Don't be surprised if it wants a shift rpm well above what your willing to spin that cam.

http://www.bgsoflex.com/auto.html

prostreetC-10 · 08-08-2010, 02:34 AM

Hmmmm.....that's a lot of weight to go 13's with that config.

Just ask Jim from PA.

Let us know when it happens and get 'er on vid!

07-29-2010, 07:49 PM	#1
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	what do you think it will run in the 1/4?? 383: vortec heads, wieand stealth, Holley 600, Comp 268 cam (268/280 advertised 224/230 @.050 .509/.512 lift with 1.6 rockers), H-beam rods, scat 3.75" crankshaft, .060 over 350 block, electric fans. 30* total timing 700r4. shifting at 5000rpm 3.73 gears no posi, 30" tires (it will hook on dry concrete, but not on blacktop) 1970 C10 long fleet haven't taken it to the track yet but It beat a 14.2 Nissan Titan __________________ -- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted

07-29-2010, 07:57 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: what do you think it will run in the 1/4?? First put some more timing it. Get it up near 36 total. You likely have more rpm left in it too. You should be making power to at least 5500rpm with that combo. I would guess and say maybe a 13.8 its almost impossible to guess at a 1/4 mile time though without a dyno sheet.Do you have a stall converter? __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

07-31-2010, 04:15 PM	#3
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Re: what do you think it will run in the 1/4?? NO POSI? First get a posi and 13's should be easy. Practice helps too. __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

07-31-2010, 05:38 PM	#4
shortbed70 Registered User Join Date: Mar 2002 Location: Forney TX Posts: 4,512	Re: what do you think it will run in the 1/4?? Peg leg and 700 will probably make a smoke show stripe through first so you will probably have to baby it out of the hole. My 65 swb with a 361 sbc hates traction on almost anything with stock suspension. I have 3.73 gear,26" tire 25-2800 stall convertor. __________________ Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274 Last edited by shortbed70; 07-31-2010 at 05:40 PM. Reason: Forgot something

08-02-2010, 07:19 PM	#5
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	Re: what do you think it will run in the 1/4?? on cement (not blacktop) with warm tires the truck will hook hard enough to flex the front left suspension all the way up and send everthing that was on my dash to the floor. I think it's hooking because I have a stock stall converter though. (1000rpm stall with my foot on the brake. ) desktop dyno says my truck makes peak HP at 5000, so that's where I've been shifting it next I plan on getting it dyno-tuned, then stall, then posi __________________ -- Josh Instagram: @americanmusc1e OLD SKOOL-- 1970 C10. 454/Th400/3.07 posi Build Thread FARM TRUCK----1949 Chevrolet 3800 Power Wagon Hauler Build Thread 1999 4wd OBS Tahoe - daily. DM me if you can't see photos i posted

08-05-2010, 09:21 PM	#6
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: what do you think it will run in the 1/4?? I personally think DeskTop Dyno is somewhat generous on HP and Torque estimates, but the actual number doesn't mean much,, it's just a number. Instead of shifting at the HP peak, I'd try shifting to put the AFTER THE SHIFT rpm in the meat of the torque curve. Bowlin and Gripos site has a 'optimium shift calculator' to play with. Don't be surprised if it wants a shift rpm well above what your willing to spin that cam. http://www.bgsoflex.com/auto.html __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

08-08-2010, 02:34 AM	#7
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: what do you think it will run in the 1/4?? Hmmmm.....that's a lot of weight to go 13's with that config. Just ask Jim from PA. Let us know when it happens and get 'er on vid! __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!



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