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Author
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Topic: header help
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RONNIE
Journeyman Posts: 72
From: MD
Registered: Jan 2003
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posted 04-27-2003 06:52 AM
   
[Question] headers helpthis what my car has in it,will uncapping the headers make a noticeable differance a the track e.t. e.t.c.the bigges tube are only 1 1/2 .THIS IS MY 76 COBRA II IT HAS A 1969 BLOCK THATS BORD .40 OVER WITH RPM EDELBROCK HEADS WITH THE RPM PERFORMER INTAKE I HAD KEITH BLACK FLAT TOP PISTONS BUT I RECENTLY UP DATED THE KEITH BLACK TO.200 DOME PISTONS IT WAS 9-5-1 COMPRESSION NOW ITS 10-5-1.IT HAS A COMP CAM [email protected] AND 512.LIFT.ITS A 700 DUEL FEED DOUBLE PUMPER WITH MECHANICAL SECONDARY.THE IGNITION IS A MSD 6A BOX/ AND MSD COIL AND THE MSD BILLET DISIRIBUTOR.THE TRANS IS A BEEFED UP C4 WITH A 10IN 3000 TCI STALL CONVERTER/IT HAS A 8IN REAR WITH A FULL SPOOL AND 410 GEARS.WITH THE OLD PISTIONS,AND BEFORE I PUT THE 3000 STALL CONVRETER MY BEST E.T.WAS A 13.20 AT 105 MPH.IAM GOING TO TRY TO TAKE IT BACK TO THE TRACK BEFORE WINTER SETS IN.WITH THE NEW PISTONS AND STALL CONVERTER AND A SET OF SLICKS,IAM HOPING FOR HIGH 12S.I WILL LET YOU KNOW THE OUT COME.
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Fastymz
Moderator Posts: 14201
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-27-2003 04:55 PM
Ronnie I've been told it's worth about .20's in the 1/4.------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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RONNIE
Journeyman Posts: 72
From: MD
Registered: Jan 2003
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posted 04-28-2003 06:19 AM
thanks for the info ronnie
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mustangboy
Gearhead Posts: 717
From: Ont, Canada
Registered: Mar 2002
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posted 04-28-2003 06:22 PM
You left out the most important detail about your car.What kind of exhaust system do you have?How restrictive your exhaust is will determine how much ET or MPH you will pick up.My old 2 1/4 system with midas mufflers(some turbo type)would slow me down close to 4/10s of a second compared to open headers.I now have 2 1/2 pipe back to the mufflers(new flowtech afterburners)and now it only slows me down about 2/10ths.I still have the 2 1/4 tailpipes and they are not mandrel bent so they don't flow very good.I am hoping to replace the tailpipes this summer and get it down to less than a tenth difference between open headers and full exhaust.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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N266fords
Gearhead Posts: 1039
From: Spokane ,WA USA
Registered: Apr 2003
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posted 04-28-2003 07:03 PM
if you have 2.5 inch mandrels and low rest mufflers like flowmasters leave it alone you will loose low end torque only to can it in the upper rpms like 6000 and up i run 13.0 at 97 with the exusht i decribed over the axles and out with a Dr. gas X-pipe all mandle bent alluminized with 3.55 a mini spool and street tires of course i am waiting on my 393 stroker kit i have on the way but the 13.o was with stock heads 1.78 and 1.45 valves reg rockers and comp 280 cam holley 600 and duraspark Bruce
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Fastymz
Moderator Posts: 14201
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 04-28-2003 07:21 PM
Bruce what motor do you run now?
Also what did you run with the exhaust open?------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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N266fords
Gearhead Posts: 1039
From: Spokane ,WA USA
Registered: Apr 2003
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posted 04-28-2003 08:57 PM
i am still running that motor and my 60 foot time was bad enough with street tire it was 2.35 ouch i know lol but with open headers it was slowe by 2 tenths and mph was the same so i lost bottom end torque i was shifting at 5700 as it was my only car then i know chicken right lol i am waiting for my special order pistons as i ordered a .040 over srp pistons to run 10.0 with my vict jr harland sharp roller rockers 9.5 deck 69 block forged nitrated crank 3.95 stroke and h-beam 4130 rods arp bolts through out and weiand stealth intake 780 vac sec msd billet dist and msd 6 plus digital ignition miloden alum water pump cross flow double pass 2 !inch tubes 19x 31 with a 16 electric fan new 69 must gas tank 20 gallon none of this is installed yet waiting for my fuel line to start there and work my way up to the engine and so on will be fun but having the patience to wait for everything so its done right sucks lol also i have a comp c-4 just built with new 2800 converter it a 26 spine should be a fast ride did i mention the super power shot nos oh yeah get in sit down shut up and hold on white knuckle air lines is ready for flight  Bruce
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RONNIE
Journeyman Posts: 72
From: MD
Registered: Jan 2003
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posted 04-29-2003 02:15 PM
quote:
Originally posted by mustangboy:
You left out the most important detail about your car.What kind of exhaust system do you have?How restrictive your exhaust is will determine how much ET or MPH you will pick up.My old 2 1/4 system with midas mufflers(some turbo type)would slow me down close to 4/10s of a second compared to open headers.I now have 2 1/2 pipe back to the mufflers(new flowtech afterburners)and now it only slows me do wn about 2/10ths.I still have the 2 1/4 tailpipes and they are not mandrel bent so they don't flow very good.I am hoping to replace the tailpipes this summer and get it down to less than a tenth difference between open headers and full exhaust.
thanks for the reply i did the same thing went to a muffler shop and they put on cheap turbo type and thats whats on it now,looking at a set of flowmaster delta force if i get them on i will let you know how it does car9fan ------------------
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RONNIE
Journeyman Posts: 72
From: MD
Registered: Jan 2003
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posted 04-29-2003 02:20 PM
quote:
Originally posted by N266fords:
if you have 2.5 inch mandrels and low rest mufflers like flowmasters leave it alone you will loose low end torque only to can it in the upper rpms like 6000 and up i run 13.0 at 97 with the exusht i decribed over the axles and out with a Dr. gas X-pipe all mandle bent alluminized with 3.55 a mini spool and street tires of course i am waiting on my 393 stroker kit i have on the way but the 13.o was with stock heads 1.78 and 1.45 valves reg rockers and comp 280 cam holley 600 and duraspark Bruce
no i have a cheap turbo type and thats whats on it now,looking at a set of flowmaster delta force if i get them on i will let you know how it does car9fan
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