Finally I got MP valve springs PN 4120249. I got them from summit. on the site specs said single coil, 1.5" OD, 1.95" uninstalled height, .206" coil wire diameter.

Al of those specs are right but I found that there's another spring inside that one!

can someone give me some advice on this?

I'll be running an erson 270º/270º .465" lift

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

That is not another spring but a spring dampner. That spring sould be fine for your app. Thanks Ron Parker












It Aint Over Until I Win













It Aint Over Until I Win

pardon my ignorance... what's a spring dampner? never heard of those (neither seen them before) do they add seating power?

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

the dampner controls vibrations in the spring at higher rpm due to harmonics most hp springs have them.

I guess that I'm running for king of the fools

thanks for the illustration! dull brain thanks that duh...

_________________
Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

No your not i run that same spring on my 340 engine in my 340 65 Baracuda with a Mopar Performance 284 duration 484 lift and it works fine. Thanks Ron Parker











It Aint Over Until I Win

and since springs are most lift related rather than type of motor, it would work fine on a stock slant head, right? thanks guys

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

You go dude i twist that 340 moter to about 6500 it will do some serious screeming. Yes it would work fine on a Slant unless you got a race engine that has a high profile cam and is going over 6000 rpm . Thanks Ron parker. PS i always wanted to come to Argentina maybe some day.









It Aint Over Until I Win

OK, premium argentine beef, good, thick nice wines, nice babes and NO EMISSIONS LAWS! come down here anytime. You'll have a hard time leaving!

Send me a PM if you ever decide to get here. I'll help you with the arrangements (hotel, etc) plus I'll show you around, the city, the food, the places, the people. And in a cool 225 dodge! what else can be offered?

_________________
Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

When the valve closes and hits the seat, it causes the spring to vibrate. It is much worse on cams that close the valve very quickly. Spring dampeners cancel out harmonic vibrations just like the balancer dampens out harmonic vibrations in your crankshaft. These dampeners are put there to keep the valve spring from getting excited and vibrating at some multiple of it's harmonic or natural frequency. This greatly extends the life of the spring and keeps it from fatiging and breaking.