BIG BLOCK FORD
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Header primary size - 547 A460 engine

5 posters

Go down

Header primary size - 547 A460 engine Empty Header primary size - 547 A460 engine

Post  Rich Osmond August 29th 2013, 8:07 pm

Gents - I posted some Dyno results last week for my 547" A460 head engine. We only pulled the engine to 7000 rpm which is where we saw peak power of ~930 hp. My Fox mustang headers wouldn't fit the Dyno so we used a set of chassis headers which were 2 1/4" primary x 4" collector. The headers I have for my car are 2 3/8" x 4". Are the 2 3/8" tubes too large for my application (2900# non-nitrous car)? Thanks for you help.

Rich Osmond

Posts : 217
Join date : 2013-02-03
Location : League City, Texas

Back to top Go down

Header primary size - 547 A460 engine Empty Re: Header primary size - 547 A460 engine

Post  Lem Evans August 29th 2013, 8:21 pm

2-3/8 is bigger than I'd want.

Lem Evans

Posts : 7445
Join date : 2008-12-03
Location : Livermore , Ky

http://bfevansraceparts.com

Back to top Go down

Header primary size - 547 A460 engine Empty Re: Header primary size - 547 A460 engine

Post  bbf-falcon August 29th 2013, 8:49 pm

X2,the 2 1/4 is bout right.

bbf-falcon

Posts : 8995
Join date : 2008-12-03
Location : Jackson, Ohio

Back to top Go down

Header primary size - 547 A460 engine Empty 547" headers

Post  Rich Osmond August 29th 2013, 10:29 pm

I am thinking the same. I have too much invested to give up power just to use a set of headers I have on hand... I will build new ones.

Know anyone looking for a nice set of HPC coated 2 3/8" Fox body headers? Headed to the "stuff for sale" section.

Rich Osmond

Posts : 217
Join date : 2013-02-03
Location : League City, Texas

Back to top Go down

Header primary size - 547 A460 engine Empty Re: Header primary size - 547 A460 engine

Post  rmcomprandy August 29th 2013, 11:41 pm

How long are those 2 3/8" primary tubes...?

IF they are made 28 to 31 inches long, you could sane yourself quite a bit of time by using a large step with 2" tubes for about the first third of the length and use most of your present headers; (unless the port itself would be to big for 2").

There would not be any difference in power to see with those 4" collectors.

rmcomprandy

Posts : 6149
Join date : 2008-12-02
Location : Roseville, Michigan

http://www.rmcompetition.com

Back to top Go down

Header primary size - 547 A460 engine Empty Headers

Post  Rich Osmond August 30th 2013, 8:15 am

Thanks everyone.

The headers will be in the 28-31" range you mentioned. IF I need to just build new headers what would you recommend? Primary tube size? Step vs no step? Collector size?

Thanks again

Rich Osmond

Posts : 217
Join date : 2013-02-03
Location : League City, Texas

Back to top Go down

Header primary size - 547 A460 engine Empty Re: Header primary size - 547 A460 engine

Post  rmcomprandy August 30th 2013, 4:58 pm

here is a whole lot more to it than maximum horsepower. RPM power range and almost everything about how the vehicle ACTS is very important.

The figures I gave you would act like a 2 1/4" straight tube header ... whether that 2 1/4" into 4" is the correct size or not is to be determined.

rmcomprandy

Posts : 6149
Join date : 2008-12-02
Location : Roseville, Michigan

http://www.rmcompetition.com

Back to top Go down

Header primary size - 547 A460 engine Empty Re: Header primary size - 547 A460 engine

Post  v-twin September 4th 2013, 1:32 am

why not try what you have ? You may lose some bottom end , but that may help with starting line traction
v-twin
v-twin

Posts : 52
Join date : 2012-02-15
Age : 76
Location : johnson city,tennessee

Back to top Go down

Header primary size - 547 A460 engine Empty 547 Headers

Post  Rich Osmond September 4th 2013, 9:22 am

Thanks, I think that is a good point especially since this is going in a stock suspension 10" tire car. I think I will do that in the interest of testing, and then modify them over the Texas "winter" to include a 2 1/4" step. Thanks again.

Rich Osmond

Posts : 217
Join date : 2013-02-03
Location : League City, Texas

Back to top Go down

Header primary size - 547 A460 engine Empty Re: Header primary size - 547 A460 engine

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum