Making headers fit. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 07-23-2010, 09:50 PM   #11
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by Danthurs View Post
Is there any chance of lower the engine in the cradle?
Wouldn't that cause the same problems for axle angle as tilting it would?

Without lowering the actual cradle, I can't see any way of lowering the engine.
xtremerevolution is offline   Reply With Quote
Old 07-23-2010, 10:04 PM   #12
Senior Member
Posts like a Supercharger
 
Addicted To Eaton's Avatar
 
Join Date: Jul 2010
Location: Chillicothe mo
Posts: 194
Thanks: 0
Thanked 0 Times in 0 Posts
Addicted To Eaton is on a distinguished road
Default

Why not run cradle spacers?
Addicted To Eaton is offline   Reply With Quote
Old 07-24-2010, 02:39 AM   #13
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by Addicted To Eaton View Post
Why not run cradle spacers?
Because that has only one advantage to rocking the engine backward: the angle of the downpipe after fitment. However, it then requires Bob and I to find lengthened subframe bolts, and source the spacers in question, the former of which may be more difficult to do. I still need to find the dimensions and specifications of those bolts so that I can try to find longer replacements online.

I have e-mailed mike at milzymotorsports for advice regarding this issue. I have offered to pay him for his time and advice if he can give me a cost effective and reliable solution to this problem. I hope he will be able to help. I'll be waiting to hear what he has to say. I've e-mailed him in particular because I'm told he is one of the people who has successfully fit 2nd gen headers into a 1st gen w-body (95-99 Monte Carlo or Lumina, I forget which). I've asked him for advice, and will be updating when I get that advice. I remember being told that he tilted the engine backward in order to fit them properly; something I'm trying to avoid for reasons already discussed.
xtremerevolution is offline   Reply With Quote
Old 07-24-2010, 06:51 AM   #14
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

If you need longer sub frame bolts, just go to the hardware store and buy grade 8 bolts, I think they are about $8 each.
Danthurs is offline   Reply With Quote
Old 07-24-2010, 04:09 PM   #15
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

I'm not comfortable using grade 8.8 bolts for subframe bolts when the factory bolts were grade 10.9. Has anyone done it before?

In addition, lowering the subframe will cause the same problems with the shaft angles as tilting the engine would.

The only option I see here is to modify the headers to fit that car. Does anyone here know anyone in Northern Ohio who can do this kind of work and not charge me a fortune for it?
xtremerevolution is offline   Reply With Quote
Old 07-24-2010, 04:20 PM   #16
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

I have an idea.

Name:  CIMG0093.jpg
Views: 0
Size:  48.1 KB

Cut 2" off the headers right at the flange, and re-weld the flange. Do the same taking 2" off the cross over pipe. Piece of cake, no bending, just cutting, and re-welding at the same angle. That way, you'll get the headers closer to the engine itself, and since they curve downward anyway, it will get us out of the danger zone. I called bob and gave him the idea, and he'll have a guy come over tonight and look at it and see if that can be done. If it can, how hard can it possibly be to make 4 straight cuts and re-welds.
xtremerevolution is offline   Reply With Quote
Old 07-24-2010, 09:41 PM   #17
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Andrei,

I have had two different kinds of headers on my 3800-powered monte carlo. I first installed some *&* headers when I had an L36, and then when I did the supercharged swap, I upgraded to SLP'* when I found the *&* to be restrictive.

I haven't installed any of the SpeedDaddy headers, so I have no idea what they look like. If they are identical to SLP'*, it'* going to take some pretty heavy firewall modification to make them fit, and more than likely, you'll also have to add longer dogbones, which is what I did to avoid firewall contact with mine. I understand your concern that this can cause issues with axles. What I would suggest would be one of two options ...

1) we can build a set of headers for the 3800 pre-gen w-body that would fit perfectly. cost would probably be around $1000 ceramic coated, or $750 w/o coating. Then you sell the other headers to recoup some of the money. You should be able to sell them around 80-85% of retail pretty easily if they are brand new in box.

2) you can send us your current headers and we can modify them to fit the pre-gen chassis. I don't know how much it would cost, it would just be based on the amount of time we have in it. are the headers coated right now, or bare?

Anyways, let me know what you think, and we'll go from there.

Mike Miller
Milzy Motorsports
He obviously would prefer to sell me something, naturally. I tossed him the idea that I was having with cutting the tubes down 2" or so.
xtremerevolution is offline   Reply With Quote
Old 07-25-2010, 12:05 AM   #18
Senior Member
True Car Nut
 
Jonpro03's Avatar
 
Join Date: Jul 2010
Location: Danville, Illinois
Posts: 2,469
Thanks: 0
Thanked 0 Times in 0 Posts
Jonpro03 is on a distinguished road
Default

I hate that word: pre-gen

It'* so clubgp
Jonpro03 is offline   Reply With Quote
Old 07-25-2010, 09:35 AM   #19
Senior Member
Posts like a Supercharger
 
Addicted To Eaton's Avatar
 
Join Date: Jul 2010
Location: Chillicothe mo
Posts: 194
Thanks: 0
Thanked 0 Times in 0 Posts
Addicted To Eaton is on a distinguished road
Default

retaliate. Call your 97 a post gen LOL!
Addicted To Eaton is offline   Reply With Quote
Old 07-26-2010, 06:25 PM   #20
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

It'* going to be tough to get away without a bunch of cutting and re-welding..

You might be able to heat up the primaries and bend it down enough with it bolted up the engine. But with that comes missfitment at the DP and x-over.

You're sure you can't just beat the firewall in?

As far as heat goes, My TOG DP flange is about a 1/4" from my firewall since I raised my drivetrain up. It doesn't hit since the engine torques it away from the firewall under load. And I'm not melting anything.
95naSTA is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
What headers fit? 231SCIC Performance, Brainstorming & Tuning 11 04-05-2008 12:34 AM
S&S Headers Will they Fit my Car? Snuggles.bf Performance, Brainstorming & Tuning 8 07-24-2006 11:13 PM
Door Panel Making Noise ridic2002 General GM Chat 7 05-05-2003 12:02 PM
ses light. making me mad buzzbomber88le 1987-1991 5 05-01-2003 10:20 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:58 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.