Front springs question
Thread Starter
Instructor
Joined: May 2015
Posts: 208
Likes: 76
From: Indianapolis
St. Jude Donor '25
Front springs question
I was planning to drop the body back on next weekend but then it occurred to me that my front end will be sitting up too high with the new Al heads and intake. I have the standard MOG 5758 on the front that I put on about 7 years ago. I need to take care of this while the body is still off to save my old body some pain. This is a convertible w/o air. I know they can be cut down (not a fan of that but if it works, ok) but ok with getting replacements as well. If you did similar engine changes, what did you do to the front springs to even out the stance? Prior the stance was perfect and I won't tolerate the nose up. Thanks for any input
Thread Starter
Instructor
Joined: May 2015
Posts: 208
Likes: 76
From: Indianapolis
St. Jude Donor '25
That's a good possibility but I really don't want to take the rear apart again to get matching set. I need to do a little more research on using F41 as I know it was part of performance package but does that mean the same weight difference as I now have (AL heads and intake, small block)?
Thread Starter
Instructor
Joined: May 2015
Posts: 208
Likes: 76
From: Indianapolis
St. Jude Donor '25
After looking at this option, I can't justify the double adjustable for my application but the GS507-09550D single adjustable appears to fit the bill. The Moog 5758 were 10 inch installed height and 474 lbs/in but the QA-1's are 550lbs/in with collapsed hieght of 9.62 inches and adjustable from 0 to 2 inch lower. This seems to work if that is the way I go. First time looking at coil overs so am I missing something?
Last edited by sauterindy; Apr 19, 2026 at 11:40 AM.
1967 Pedal Car Champion
Joined: Mar 2020
Posts: 8,946
Likes: 4,113
From: US-PNW
For your components, the combined weight difference between cast to aluminum is about 75lbs. That's not a lot when you're talking about front spring compression that's supporting about 1600 pounds. I don't think you will be able to preemptively compensate for the weight loss before it's all back together and evaluated.
Thread Starter
Instructor
Joined: May 2015
Posts: 208
Likes: 76
From: Indianapolis
St. Jude Donor '25
I suspected that might be the case but wanted to ask the question before doing the drop. If it turns out to make a noticeable difference I will address then. Don't want to spend money I don't need to.
thanks
thanks
Team Owner
Joined: Sep 2006
Posts: 31,135
Likes: 4,206
From: Westminster Maryland
Hello,
Here's some info from Eaton (the spring people) about cutting coil springs to adjust front ride height.
Maybe some help?
Regards.....
https://www.eatondetroitspring.com/c...-coil-springs/
Here's some info from Eaton (the spring people) about cutting coil springs to adjust front ride height.
Maybe some help?
Regards.....
https://www.eatondetroitspring.com/c...-coil-springs/
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Melting Slicks
Joined: Dec 2009
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From: Thunder Bay
I have Al heads, Al intake, headers, and Al water pump. All of which remove weight and my ride height did not change appreciably. I would try it the way it is before making any changes to the springs.
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I have Aluminium heads, intake, radiator, and a lot of unnecessary factory garbage removed.
my ride height did indeed change. F41 suspension factory.
Cut one full coil. 27 1/2 inches now.
my ride height did indeed change. F41 suspension factory.
Cut one full coil. 27 1/2 inches now.
Drifting
Joined: Nov 2007
Posts: 1,687
Likes: 269
From: New York
That's a good possibility but I really don't want to take the rear apart again to get matching set. I need to do a little more research on using F41 as I know it was part of performance package but does that mean the same weight difference as I now have (AL heads and intake, small block)?
"my front end will be sitting up too high" this may help.
This is the proper way to set the height
