552 header advice

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552 header advice

Post  ford385 on March 27th 2017, 11:05 pm

Looking to get header advice/recommendations for my 552ci build.  I'm currently running a 2" fender exit header but need to move to chassis exit.  Intended use is mud, mud drags, sand, and a lot of street driving.

My questions is, of the below options what do I gain/lose with one of the below options?
Option A: 1-7/8” primary with 3” collector – long tube headers
Option B: 1-7/8" primary with 3" collector  - shorty (Sanderson FF463)
Option C: 1-3/4 primary with 2-1/2 collector – shorty (mid-length header)
Option D: 1-3/4 primary stepped to 2” stepped to 2-1/2” – tri-y headers

Additional Specs:
-1979 bronco @ about 5400lbs
-10.99:1 compression
-out of the box AFR 285cc heads  (flow 396/267 @ .600)
-AFR 4150 intake
-Quick Fuel 1050
-Broader Performance C6 with flash stall of 3500
-42.5" tires with 5.38:1 gears

Cam specs:
Solid flat tappet
I = 255@.050, .623 lift
E = 259@.050, .637 lift
116 lobe sep, installed at 110

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Re: 552 header advice

Post  Straubtech on March 28th 2017, 9:50 am

What is going to be the max rpm range this engine sees?

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Re: 552 header advice

Post  dfree383 on March 28th 2017, 10:01 am

You need to look for other option, those are all small forthe build you have described
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Re: 552 header advice

Post  ford385 on March 28th 2017, 10:38 am

Straubtech wrote:What is going to be the max rpm range this engine sees?

Pk hp is at 5500; pk tq is at 5000. shift point is 5900

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Re: 552 header advice

Post  dfree383 on March 28th 2017, 11:36 am

ford385 wrote:
Straubtech wrote:What is going to be the max rpm range this engine sees?

Pk hp is at 5500; pk tq is at 5000.  shift point is 5900

Did you dyno it?
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Re: 552 header advice

Post  Straubtech on March 28th 2017, 11:38 am

You will need a 2" header for the rpm range you want to run it. 1 7/8" will choke it at around 4800-5000 rpm.

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