Valve spring shims

[killab443]

Is it good to use shims on the stock springs so I can rev out my motor a little higher? If so were can I get them cheap cuz Im going to be doing a valve job on my head soon.

 

[Mackzero]

I suppose you could, but it would be better to just replace the springs/retainers with new/stiffer ones. Most of us run the Crowers.

 

[RED_AWD_BLUR]

B.S. the crowers are not that much higher spring rate than stock. the stock springs have a seat press. like 66lbs the crowers are like 69lbs you need like 75lbs for a shimmed stock spring. that is what bushur racing did for the longest time. otherwise dual valve springs for like $300. If you aare running a street car you don't need them. My buddy is running 8200rpm on crower stage III on stock springs unshimmed. booyah

 

[Defiant]

The valvetrain isn't the limiting factor in the DSM engine.

 

[JDMFirstGen]

Yeah, I was running crower stage 3 'race' cams with stock springs and retainers. I was powershifting at 8200rpm and I never floated a valve or lost power.

Crower's Springs are junk and are close to the same as stock, only about 3psi in seat press. difference. Buschur and shep and everyone else were running shimmed stockers until companys started making them for our cars.

 

[JessesTalon]

Unless you have cams and enough power that will keep up in the high rpm's you shouldn't even be thinking about pushing the rev's that far just yet.