Re: {Chrysler 300} Hood springs

On Mon, Mar 30, 2026, 11:04 AM John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:

there is a lot to this, best to just put it out there..
The springs are poorly designed from day one. They used Ny er springs with the heavy grill of a 300, first part of problem , but not the root cause. It just shows up sooner on a 300 as springs get weak .
We redesigned the springs 10 years ago via the help of competent spring engineer , but to get more pull in the restricted collapsed height required , we had to drop a turn due that limited collapsed height space vs extension still needed, and no room to make the spring coil significantly wider ( stronger spring = thicker wire ,raises collapsed height ; there is no magic alloy to make it stronger with same size spring wire so you end up with a duplicate of problem spring , but heavy wire gives slightly more pull , but you enter metal fatigue area again, hopefully with best material and best heat treat .
The reason it gets weaker is the engineer who designed it (even for NY er ) was flat out incompetent . As shipped it takes the metal in the spring beyond the yield point every time , so that each time you open the hood , when closing it yields a bit, soon it will not pick up the hood .( spring was overstretched when new, due to incompetence .
Issue is you cant get a 10 lb spring in a 7 lb space

All this came from a company that makes high quality springs ( Lee Spring) , and analyzed the stock spring first .

I spent 6 mo on this .

We went ahead with the stronger wire anyway, thinking much better than the way the situation was, (and it is )!, but still a poor design from spring yield view point --- surprisingly , the end results varied . Some great results, sometimes not much .

That variable result was traced not to spring ( they are all the same, high QC) but 10 lbs of bondo and paint on some cars
Some cars might have 4 paint jobs by now . body shops pile it on .

So we DO have those springs a factually slightly better reissue of same spring .
Probably great if you went down to bare metal as you should. But despite "high end paint job" that does not happen .
So problem remained . For some cars .
More research :

the only way to get more spring in a limited space is concentric springs . then each one us not stretched to yield , thinner wire keeps collapsed height together they add up force without exceeding compressed height (= how high hood opens)
This is why the valve springs in a hemi engine havev two or even three spring coils inside each other . You cannot make the spring taller in a hemi ( = raising rockers) as the other end of rocker moves off the center of the valve stem due to the 45 degree angle .
If you raise up rocker arms and then make long rockers , they hit the valve cover , spark tubes do not reach etc

So we offer hood booster springs that add lift to what you have ; they slide into the stock springs , help with this ,;
And easier to do
Nothing EVER comes easy ..
-- oil the pivots too
Put in the hood catch too . These hoods go for over 10 k, looking for years , one cannot find one .
A fellow in Montreal had a standing offer of 10k for three years, never got one , I understand he finally made one from two that had flown open at speed .
Hope this helps,
john g

On Mar 30, 2026, at 11:38 AM, 'Williamson, Dennis G' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

https://chrysler300club.com/rcmstuff/partsforsale.html

Item # 24 in Club Parts for Sale page.

Dennis Williamson

Director of Engineering

Snapon Diagnostics

408-806-0532

From: mguarneri via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Monday, March 30, 2026 8:33 AM
To: markartall@xxxxxxxxx; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} Hood springs

Try these guys. . . . John https: //www. ebay. com/str/moparpro In a message dated 3/30/2026 11: 08: 13 AM Eastern Daylight Time, chrysler-300-club-international@ googlegroups. com writes: Can anyone suggest a good source for hood springs for a 57 300

Try these guys....John

https://www.ebay.com/str/moparpro

In a message dated 3/30/2026 11:08:13 AM Eastern Daylight Time, chrysler-300-club-international@xxxxxxxxxxxxxxxx writes:

Can anyone suggest a good source for hood springs for a 57 300 C?

Mark Artall

Sent from my iPhone

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