Re: {Chrysler 300} FW: Valve spring Q

i would lean to hot heads recommendations . if going single spring .

I wanted new tech beehive springs , engine builder advised against it as failure mode drops valve . — per his observation the chrysler hemi has a very low installed spring height by original design , hard to get the required action in a small height spring , why dual springs . And redundancy against valve drop . There was nothing wrong with original design , well thought out and to my knowledge gave zero

problems . There can be issues with harmonics involving dampers and friction between the springs to prevent that .

Hot heads has experience , I would go with them or stay stock . Not gong to spin to 5800 with an automatic.

there is a lot more to it than pressures at at a height , including the short installed height , can lead to spring bind. compared to later engines designed from the start for .5” valve travel and a taller spring , or rockers that can move up like chevy . Taller spring in a hemi not only means longer valves it destroys valve train geometry as tip of valve is moved farther out from center , rockers hit all wrong . on and on ...

? stay stock ?

While on this —two questions does anyone know the change in valve gap from hot to cold? not the setting , the change on hemi ?

2) when timing gear dots align , cam key is always at about 4 o clock , — I assume but not sure # 1 is also at tdc ? With cam key at 4 o’clock is that tdc compression stroke and thus ignition , or beginning of intake stroke ?

this is relevsnt to positioning distributor shaft / oil pump gear correctly . valve train not in yet .

thanks John

Sent from my iPhone not by choice

On 5 Jan 2021, at 9:14 pm, RICK AND DEBBIE CLAPHAM <rixpac@xxxxxxx> wrote:

I used Mopar small block springs for the 340 engine on the early Hemi engines the past 30 years.

Sent from Mail for Windows 10

From: micke.sundbom
Sent: Tuesday, January 5, 2021 4:24 PM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: {Chrysler 300} FW: Valve spring Q

Skickat från min Galaxy

Hello

When reassembling refurbished 300C heads, I'm a little impatient and send out a question here. I have different options with valve springs. I wonder what spring pressure is achieved when original dual springs in new condition were mounted?

I'm leaning towards an upgrade of new double springs that produce 110lb's on the seat. The question is if I go overboard here? Performance single springs that develop better pressure than my tired + 60years old dual one is easy to find. Cam & lifters stock.

Valves, guides, hardned seats all new here. Leaning against double springs regardless.

Any input of intrest.

/Michael

Skickat från min Galaxy

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