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Author Topic:   header ext.pipe
Steve Dupree
Dirt Freak

Total posts: 316
posted May 09, 2005 08:02 PM  
How about some imput on the length of pipe to add to header. Engine 351w with two barral,1 5/8 headers with 3" collector 500 cfm carb. Thanks

J3
Dirt Maniac

Total posts: 188
posted May 10, 2005 02:35 AM  
Steve, where did you find a 500cfm 2 barral for a ford? What did it come off of, and where can I get one? Thanks for the help.

J3
Dirt Maniac

Total posts: 188
posted May 10, 2005 02:40 AM  
Oh, sorry never answered your question. That will actualy depend on what you want. Use the tool box, there is a header length calculator in there. I would suggest about 38 to 40 inches.

Steve Dupree
Dirt Freak

Total posts: 316
posted May 10, 2005 04:24 AM  
Hey j3 well i found it on ebay with a c-90 intake off a 351w. The same guy had both but was selling them seperate i paid 5.00 for the intake and 20.00 for the carb. I really lucked out on the carb i have never seen another one and i look all the time. What got my attension on the item was how big top of carb wasin the pic the guy didnt know anything about what it was so really lucked out there. Ok on this header ? i did look on the tools and well it says 37 in. for my motor for turning 6000. My ? was where do you measure from and i would think there would be a varible in rpm in the caculator not just rpm desired. I want to know the best over all length for more torqe and still have top end. I made some yesterday and started at 22" long by the feel of the motor just setting there reving it i think that is to long but havnt drove it down the road yet. So do i take a tape from the flange to the collecter and then addwhat ever length missing or what

J3
Dirt Maniac

Total posts: 188
posted May 10, 2005 09:04 PM  
From what I understand, you want to measure from the collector back that many inches. From my collector back, I have 40 inches on mine connected with a crossover pipe.

If you find another one of those carbs, let me know.

Steve Dupree
Dirt Freak

Total posts: 316
posted May 11, 2005 05:27 AM  
Will do j3 send me a private message so i will remember id. Well there was a guy in Arizona that told me we could get some extra power even if it wasnt in rpm. Taking a flex tape and measuring the headers we are about like 40" and the calculator calls say for 38" So we are about right length for max rpms we can run but we want the extra torqe from the pipe. This is what we did and i think it will work it sure feels good to 5500. We made 2 pipes 3" X 22" It diffently made a difference at idle and i could hear my motor. So we went out and ran it up a couple of times like you would at the track. Had more bottom end and through to 5500 so we came in and jacked up car and i took them off and looked at them. You can tell by how they blued the metal how far back they got hot and it looks like for are motor we need to cut off like 8" off of the 22" we started with so we will end up with a 14" pipe added to the header. I will let you guys know after this weekend on how this acted on the track i think it will help that little bit we need to keep up better with all these chevys over here. lol Have fun and good luck to all that are racing.

speedyd1
Dirt Maniac

Total posts: 170
posted May 13, 2005 11:34 AM  
J3 - try the early to mid 80's model mustang with the 3.8 v6.

speedyd1
Dirt Maniac

Total posts: 170
posted May 13, 2005 11:38 AM  
talk to the ministock guys at your track - they probably have some left over from those cars they built. Motorcraft 500 CFM 2 Barrel. be careful when looking cause they did make them in 350 cfm also.

mansfief
Dirt Maniac

Total posts: 128
posted May 13, 2005 11:43 AM  
Old timers, like me, painted the exhaust white. Just at the end where the paint stops burning off, cut the pipe.

4d_POWER
Dirt Maniac

Total posts: 136
posted May 13, 2005 06:02 PM  
I run with open headers, I did have about an 18" inch extension with mufflers but when I got to the track someone said "man your car is way to quiet, what's wrong with it? " haha ..I removed the extensions and mufflers. removed about 30lbs

4jw
Dirt Roller

Total posts: 10
posted May 14, 2005 01:02 AM  
quote:
Originally posted by speedyd1:
J3 - try the early to mid 80's model mustang with the 3.8 v6.

A V6 carb will bolt to the 351W??

4jw
Dirt Roller

Total posts: 10
posted May 14, 2005 01:03 AM  
quote:
Originally posted by speedyd1:
talk to the ministock guys at your track - they probably have some left over from those cars they built. Motorcraft 500 CFM 2 Barrel. be careful when looking cause they did make them in 350 cfm also.

How do I know that it is a 500 CFM verus the 350cfm?

Steve Dupree
Dirt Freak

Total posts: 316
posted May 14, 2005 06:45 AM  
Hey 4j you can tell by the top of carb. mainly it is as big as a 4412 holley and the ports where the butterflys are are a little bigger. As far as our extensions we ended up only adding 12" and the weigh 6lbs for both. Our car is a little heavy and we have added weight again to try more rear % We need a little more pull with the cam we tried this year so thats why we were asking. Yes old timer i have heard the same thing and thats just about what we did cut it where the color of the pipe was real hot it seems like it has more bottom end through 5500 and we only turn 5800 at the 5/16 track we run with 6.50 final. The only little ford at the track most of the time....... lol Last week was fun. We took 6th in the heat had to start 6th row back in B main took 3rd started 9th row in A main and took 7th out of 31 chevys and 2 fords other ford finished like 15th because of crash. Tonite maybe we light it up BABY you guys have fun

The Vanburen Rocket 22
Dirt Full Roller

Total posts: 30
posted May 14, 2005 06:57 AM  
quote:
Originally posted by mansfief:
Old timers, like me, painted the exhaust white. Just at the end where the paint stops burning off, cut the pipe.

we have done that also, with the painting of the exhaust,and cut it off where the paint stops burning. now we just run the open headers on it!

    

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