I need a replacement valve spring for a 406 sbc. the inner spring broke after a few hrs of use.
the O.D. is 1.580, I.D. is .750 the free hight is 2.550 its a dual spring w/damper, color code looks white or very light grey, the installed hight looks like 1.900-2.10, hard to measure w/my red neck engineering calipers. it was set up for a soild roller cam .6688 lift using 1.6 rockers
the org. spring manufacture is unknown, I've looked on the net till my eyes R falling out, I dont want to buy a whole set just to replace 1 inner spring.
Please, if U can help, much thanks :thumbup:
If I were you, I would take no chances and REPLACE THEM ALL. There are many claiming broken COMP springs - not saying that's what you have, or that's what your problem is. Just saying that for the investment you may very well wind up saving a lot more money in the long run. Have you checked all of your springs pressures???
I guess I'll swap out the springs...whats the correct springs for the motor?
263/273 dur @ .50 .627 lift, install hight anywherer from 1.900-2.100
13.8 c/r w/tunnelram, my push rods are 8.100, had 1.6 Lunati rocker on it B4, I have a set of 1.5 CopCams I'm going too,
crane told me the inner spring broke due to using the motor to long in the 2500 rpm range, that this motor is a race only, and the harmonics at low rpms prob. broke the inner spring???
so go to a lower seat pressure and drop my redline to 6K max.
I have a Rev kit, so the solid roller stick and lifters should B ok!
I have a set of teflon oil seals so the inner spring cant B too small.
my inner now measures .753 I.D.
I'm not gonna race the boat, may B wack it every now and then, mostly around 5-6000 max. and 2500-3500 just screw balling around.
um... with that setup a 6K redline won't even see your max power potential... If you wanted to keep it under 6K having a more mild build would have netted you MORE power... It really is a nice setup, i just think you're never going to see its full potential.
Go to the cam manufacturer, they have all the data and spring requirements, you can't simply pull springs off the shelf, your cam profile/ramp aggressiveness and lift have a lot to do with spring requirements.
#9995's that'll do it,
as far as the spring breaking cuz it was hanging out too long around 2500R's
Isky kinda Laffed at that, ,more likely do to the long stowage, 7yrs!
Boat= B.O.A.T. break out another thousand
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