While pricing a new cam - the DC engine book says I need these springs.

Syleng1 said

MOPAROFFICIAL- what did you mean- "but the real drop in spring is the mp#847? What is that? I assume P5249847 spring I was also looking at the P3412068- a bit more spring pressure but a bit more $ too.
My dealer says he can get them for about $8.00 per spring next day. seems a bit inexpensive to my memory.

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The 5249847 works great , set it up at 140 seat...they like to lose about 10 lbs after some use...it'll be around 290 open, if you go less it will be between 265-275 open. This spring needs no spring seat cutting, but you want to trim the guide so you don't pinch a seal. Mp cams are hit and miss, some don't last...so I like to try run only the amount of spring needed to control the valve at the rpms I run it. You want just enough, anymore is just wear and resistance/drag. 130-140 seat and about 290 is right on for that cam.
Springs lose their pressure anywhere from 7-12 lbs with cycling/use...so always figure that in.
The comp dbls are okay...but they don't seem to last more 4-5 years till they end up about .075 shorter inst height to keep the advertised. They had two versions, one was 140 seat...the other 110 or something....I don't like comp cams very much. I like kmotion,crane,Herbert,Engle, .....Isky is too much money, talk about paying for a name...