Valve springs

[TALONTRAX]

I'd like to have a little input on valve springs. I am rebuilding this stock 2G head, basic valve job,etc. I was thinking of upgrading to a 264/272 cam combo, or 264/264. Will stock new valve springs be ok or should I upgrade to a dual spring setup or a higher lift single spring set ?

Thanks

 

[imagine3163]

The stock springs will be ok. But, it wouldn't hurt to put in some upgraded ones. You do not need dual spring ones unless you are planning on reving to 10,000 rpms. If you want a strong upgrade, I would go with the Brian Crower springs and retainers.

 

[CTP]

They aren't absolutely necessary, but they aren't a bad idea. FFWD recommends them and he knows what he's talking about:

Our Number Two question most often asked, "Do I need upgraded springs in order to run these cams?"

]Our final answer: In our personal experience, ANY kind of cam sold out there no matter what the profile is, would greatly benefit from using stiffer than OEM springs. Smoother power curves, a more linear powerband, raised peak power levels at higher RPMs, and less chance of valve bounce (which is a HP killer) is enhanced by the usage of some sort of upgraded spring kit. Of course, higher control of the valve event will more so keep float from rearing its ugly head.

So, to get back to the question, we recommend an upgraded spring kit not only for the reasons mentioned above but also to fully utilize what the cams themselves can do.

Can you still run these cams even though your cash allotment for a spring kit was spent on alimony, bail bonds, or maybe even college tuition? If you must do it that way, then take it easy with your motor...don't rev to the moon.

 

[Gstclipse69]

Many many people run 264 272 combos with stock springs. If you do upgrade the most common set is brian crower. However, there is a debate with this, springs should be upgraded but the valve retainers should be o.k. unless its strictly a drag car. Slowboy has bc springs for $70. Dual valve springs are mainly for cams with an aggressive lobe such as fp's x version cams, or if your revving to the moon

 

[Defiant]

Stronger springs might gain you a few hundred RPM before the valves float. Terrific if you're racing and those few spins might make a difference.
Meanwhile, back on earth again, on a street car you'll have to spin the cams against that higher pressure with every turn, and put that much more stress on the timing belt all the time. Stop and consider what your engine will spend 95% of its time doing when you plot and plan what you're going to build. Not many engine racing mods have much utility on the street.

 

[1992awdlaser]

I have fp2 cams with stock springs. I rev to 8,000 when beating on the car and have no problems or signs of valve float. Sometimes it goes to a slightly higher rpm like 8200 and it doesn't matter. If you have the money I would put some on though.