67 BB side pipe exhaust manifolds (can they be hogged out?)

[Gerry]

I need some advice on 67 BB side pipe exhaust manifolds. I am in the process of pulling my original #s matching motor (427) and trans (M20) and replacing them with a 540 CI (675HP) Shafiroff Racing motor and a Keisler TK600 5 spd trans so I can continue driving the hell out of this car without the worry of destroying the original drivetrain. I would like to keep the sidepipes (I already replaced the originals with Allen Stainless Steel ones) looking original. I thought I could buy a repro set of exhaust manifolds and have them hogged out and jethot coated so as to keep from losing too much (even a little is too much) of my hard earned horsepower but I don't know if they would be amenable to this treatment (I don't want them glowing bright red and melting my optima battery (I already melted two before I put the battery shield in place). I would appreciate any and all help with this situation. 67 Heaven, what did you use on your motor? Thank you for the help and see you all at Carlisle (car will be clean this year, I promise).

Best regards,
Gerry

 

[67HEAVEN]

67 Heaven, what did you use on your motor?

Gerry,

Congrats on the new engine. She'll be killer.

I'm using Hooker sidemount headers..........therefore, no exhaust manifolds to worry about.

 

[Gerry]

Thanks, do you think a set of headers could be fashioned or bought and still hook them up to the side exhaust?

Gerry

Gerry,

Congrats on the new engine. She'll be killer.

I'm using Hooker sidemount headers..........therefore, no exhaust manifolds to worry about.

 

[Sting Ray]

Gerry,

If Mark (VNV) doesn't answer this I will look back and find the info for you, Rich L. set him in the right direction for headers that will work, you just need to add a piece to the side exhaust I believe to meet the header.


Tom M

 

[Sting Ray]

Sanderson Headers were what he used I believe.

Tom M

 

[IH2LOSE]

When I purchased my 66 it had a set of staul big tube headers on it.They turned out perfectly and mated up to the factory side pipes. the side pipes were cut just as they finished the 90 degree bend .

I just recently sold them at a swap meet.

Check with staul there was another guy on this web site 427/450 was his name.He was going to purchase mine about 2 years ago but was able to find them new instead

Good luck

 

[Gerry]

Thanks for the info, I will look up Staul and Anderson and hopefully I can still buy something that will work. Thanks again and hope to see you all at Carlisle.

Best regards,
Gerry

 

[66 Red Rocket]

Headers

I looked into a set of Headman headers for BB midyear with sidepipes, but went with Hooker header/sidepipes instead. I have seen the headmans but the 1 7/8" pipes were on the small side for the engine. John

 

[Delph]

I used Sanderson on mine

 

[Delph]

sorry I m

essed

 

[Gerry]

67 BB headers

That's a BEAUTIFUL sight to behold. Thanks to all for the info, I am trying like hell to get this together for Carlisle. (I need to suprise someone).

Best regards,
Gerry

 

[Viet Nam Vett]

Gerry,

If Mark (VNV) doesn't answer this I will look back and find the info for you, Rich L. set him in the right direction for headers that will work, you just need to add a piece to the side exhaust I believe to meet the header.


Tom M

Don't know if your new motor uses Alum heads like the ones on the 502 ...If they are the same or similar..then the "Sanderson Model # BB-5" is what you want as far as a Shorty Header goes. Stock BB Exhaust Manifolds are very restritive and will suck up quite a bit of that Big Bucks HP you paid for.

If you want Max performance from your motor ( The Rated Flywheel HP ) then I think you'll want Full Length Headers with the correct tube diameter Like 67 Heaven has. The next best thing to that would be Shorty Block Hugger's Like the Sanderson BB-5.

The Sweet Thunder Side Pipes will give you "2 1/4" internal baffel diameter as compared to the stock 1 7/8". Sweet thuner also makes an 2 1/2 " internal diameter but it's larger on the out side diameter....or again like 67 Heaven ..4'' GET OUT OF MY WAY SIDE PIPES...!!!

I would check with the motor builder and he can tell you the recomended tube diameter and length that the motor was dyno-ed with.

Just because it says 502 Cubes and 502 Hp on the box doesn't mean that's what you'll end up with. When you stick on a pair of stock restritive exhaust manifolds and then plum that into a pair of restrictive pipes ... you just threw away HP that you paid for..

 

[stepinwolf]

Gerry,

If Mark (VNV) doesn't answer this I will look back and find the info for you, Rich L. set him in the right direction for headers that will work, you just need to add a piece to the side exhaust I believe to meet the header.


Tom M

The headers Rich had made up were from " Sanderson " ( I have a set on order ), and they were made specially by Sanderson for the 502 BB in our mid-years. As you mention, we will need to ad a small section to the pipes, a little ways back from the flange. A simple cut and splice type of mod.

Stepinwolf

 

[Viet Nam Vett]

The headers Rich had made up were from " Sanderson " ( I have a set on order ), and they were made specially by Sanderson for the 502 BB in our mid-years. As you mention, we will need to ad a small section to the pipes, a little ways back from the flange. A simple cut and splice type of mod.

Stepinwolf

Here's a shot of the Sanderson BB-5's on my 502..

The Passenger side shot is not the final header they supplied. The forward tube was placed in front of the second tube from the front....in the final header.

What's special about this header is that it is releaved to follow the contour of the 502 head and clear the spark plugs.

 

[stepinwolf]

Easy on the eyes

VNV, sure is a great looking setup you have there, makes me want to start tearing into mine sooner. The difficulty for me right now is in trying to plan for the modifications that will effect all the different areas of the car.

During a regular restoration ( believe me I have done my share ) I can plan for just about complete everything ( parts and labour ) that goes into the rebuild in a matter of only a few weeks, but this type of build is much more involved.

Time, and dedication are the only thing I have going for me now. I will be more then happy to keep all of you abreast of the progress as the build comes along.

Stepinwolf

 

[Viet Nam Vett]

Time, and dedication are the only thing I have going for me now.

That's the key... and of course...The Corvette Action Center to come and get some good advice when you

 

[Gerry]

HI Guys,

Thanks for all the info. I may try a variation on some of the suggestions. What do you think of using correct long tube headers straight back to a set of short mufflers and then angling tubes after the mufflers to exit where the sidepipes would exit. This would save a ton of money and preserve the HP I am paying for??? All thoughts are very welcome.

Best regards,
Gerry

 

[Viet Nam Vett]

HI Guys,

Thanks for all the info. I may try a variation on some of the suggestions. What do you think of using correct long tube headers straight back to a set of short mufflers and then angling tubes after the mufflers to exit where the sidepipes would exit. This would save a ton of money and preserve the HP I am paying for??? All thoughts are very welcome.

Best regards,
Gerry

Some of our For Most Forum members ..'SWCDuke" and Or "John Z" Or "Bill B"
as well as a few others to numerous to mention would explain that a correctly sized total under car exhaust with the right mufflers and headers will yeild you much moer power then side pipes.

You might want to use the search function and see if you can locate past threads that were covered on just this topic. There was some excellent info posted about exhaust systems for the Midyear..and power gains and losses..

 

[Gerry]

Some of our For Most Forum members ..'SWCDuke" and Or "John Z" Or "Bill B"
as well as a few others to numerous to mention would explain that a correctly sized total under car exhaust with the right mufflers and headers will yeild you much moer power then side pipes.

You might want to use the search function and see if you can locate past threads that were covered on just this topic. There was some excellent info posted about exhaust systems for the Midyear..and power gains and losses..

Just read through lots of posts on this subject, that plus speaking with Shafiroff and Stahl tells me that for this motor the best would be full headers (2 1/8 - 2 1/4 primaries ) to a 3 1/2 - 4 " collector (length ? ) to an under the car exhaust with the hope of exiting at the original sidepipe cover exit via a right angle bend. Now I have to see if this fits. I have a relatively new set of SS Allen sidepipes on the car now pity I can't use them. I love the sound of them (Louder is better , Huh, What did you say?) and they are louder then the originals but I think they still are too restrictive for this engine. Thanks for all the help and I am still open to suggestions but my time is running out if I am going to have this "thing" ready for Carlisle.

Best regards,
Gerry