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Old 08-24-2019, 04:28 PM   #1
Formaggio Nova
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Default Header Size and HP / ET Benefits

I have a SBC with a F2 makes 1500 hp and 1125 tq.

I am wondering what size headers you all are running and what size primary you recommend.

Also if you were running smaller headers and stepped up to a large say 2 -2 1/4 primary. What difference did you see and was it worth it.

I had a set of 1 5/8 on the motor when it was making 1100 hp and it cooked the Jet Hot coat right off the headers.

Thank you for your feedback.

Ryan
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Old 08-24-2019, 09:35 PM   #2
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Default Re: Header Size and HP / ET Benefits

1/8 th bigger than exhaust port , no steps,
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Old 08-25-2019, 07:16 PM   #3
Ron Clevenger
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Default Re: Header Size and HP / ET Benefits

Big as you can (within reason) and still keep them sealed against the head. Also.......no steps....waste of time and money.
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Old 08-26-2019, 09:09 PM   #4
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Default Re: Header Size and HP / ET Benefits

Ran 2" stepped to 2 1/8" on a 400 sbc with an F2. Made 1700 HP . As big as you can fit .
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Old 08-27-2019, 12:08 PM   #5
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Default Re: Header Size and HP / ET Benefits

Quote:
Originally Posted by Screwblower View Post
1/8 th bigger than exhaust port , no steps,
Quote:
Originally Posted by Ron Clevenger View Post
Big as you can (within reason) and still keep them sealed against the head. Also.......no steps....waste of time and money.
You guys are saying that steps are a waste?? I need to make a set of headers this winter and want to come off the head with a tube that matches the ex port size to make the initial bend,,say 2 inch then step up in maybe 6 or 7 inches to a 2 1/4 or 2 1/2 tube with a 4 inch collector into the 4 inch exhaust system on there now.
545 inch 2nd gen hemi with a 1071 stage 3 BDS.

What say ye?
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Old 08-27-2019, 12:37 PM   #6
Ron Clevenger
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Default Re: Header Size and HP / ET Benefits

Quote:
Originally Posted by jstahemi119 View Post
You guys are saying that steps are a waste?? I need to make a set of headers this winter and want to come off the head with a tube that matches the ex port size to make the initial bend,,say 2 inch then step up in maybe 6 or 7 inches to a 2 1/4 or 2 1/2 tube with a 4 inch collector into the 4 inch exhaust system on there now.
545 inch 2nd gen hemi with a 1071 stage 3 BDS.

What say ye?
Steps function is based on Naturally Aspirated engines. Depending on your power output with the blower, the only reason I could see in using steps would be. Need small enough to seal at the port,...but increasing right after that would increase volume exit capacity. But the counter to that is, as the gas exits the port it is cooling and decreasing in volume. So, if your making the kind of power were it would benefit is the question. And we are talking,...all out type application.
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Old 08-28-2019, 12:28 AM   #7
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Default Re: Header Size and HP / ET Benefits

Thanks Ron.
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Old 09-01-2019, 07:50 AM   #8
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Default Re: Header Size and HP / ET Benefits

Quote:
Originally Posted by jstahemi119 View Post
You guys are saying that steps are a waste?? I need to make a set of headers this winter and want to come off the head with a tube that matches the ex port size to make the initial bend,,say 2 inch then step up in maybe 6 or 7 inches to a 2 1/4 or 2 1/2 tube with a 4 inch collector into the 4 inch exhaust system on there now.
545 inch 2nd gen hemi with a 1071 stage 3 BDS.

What say ye?
1/8th bigger than port gives you the step without the added cost. Gives a little cost break on purchase if buying lemons/ hooker .... standard down and under type.
Plus by 3000rpm , the engine has filled the 1/8th right off the port without any negative effects. 3500rpm and above is where the engine lives.

Since you seem to be fabricating your own then zoomies are the best option.
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Old 09-01-2019, 02:50 PM   #9
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Default Re: Header Size and HP / ET Benefits

Speaking of Lemon Headers. Does anyone have any good or bad experiences from their products?

l am waiting for my set to be built and just curious. ( Lemons)

I talked to Dan and he is very nice and knowledgeable about the product... The lead time on them is killing me.
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Old 09-01-2019, 05:12 PM   #10
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Default Re: Header Size and HP / ET Benefits

Quote:
Originally Posted by Formaggio Nova View Post

Speaking of
Lemon Headers. Does anyone have any good or bad experiences from their products?

l am waiting for my set to be built and just curious. ( Lemons)

I talked to Dan and he is very nice and knowledgeable about the product... The lead time on them is killing me.
Please let us know.
What's your car?
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Old 09-04-2019, 06:26 PM   #11
Vader Ta
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Default Re: Header Size and HP / ET Benefits

Quote:
Originally Posted by Formaggio Nova View Post
Speaking of Lemon Headers. Does anyone have any good or bad experiences from their products?

l am waiting for my set to be built and just curious. ( Lemons)

I talked to Dan and he is very nice and knowledgeable about the product... The lead time on them is killing me.
I had Lemons build my headers for my supercharged combo. Overall they were good. Had to come up with my own tab system to hold my collectors on as the ones they used kept tearing off. Other than that they did the job.
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Old 09-04-2019, 09:19 PM   #12
jstahemi119
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Default Re: Header Size and HP / ET Benefits

Quote:
Originally Posted by Screwblower View Post
1/8th bigger than port gives you the step without the added cost. Gives a little cost break on purchase if buying lemons/ hooker .... standard down and under type.
Plus by 3000rpm , the engine has filled the 1/8th right off the port without any negative effects. 3500rpm and above is where the engine lives.

Since you seem to be fabricating your own then zoomies are the best option.

Zoomies are cool but my brick is street driven often gets exercised so I'll have to stay with the tailpipes out the back bumper.
I have dumpers that open with a band clamp.
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Old 09-05-2019, 12:28 AM   #13
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Default Re: Header Size and HP / ET Benefits

As big as will fit.
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Old 09-12-2019, 11:25 PM   #14
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Default Re: Header Size and HP / ET Benefits

Dan at lemons does great work! Very nice and fit like a glove. Worth the wait. Or you can always pay to move ahead in line
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Old 09-14-2019, 02:21 PM   #15
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Default Re: Header Size and HP / ET Benefits

I was taught the idea wasd to transition out of the head as smoothly as possible, match the exhaust port exactly in square inches with the corresponding size tubing, then, at some specific distance like 9 or 13 inches, or whatever, step up smoothly, to the collector.
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