do i need new springs???
 

im going to put on crane 1.7 RR on my 90 GT. the motor runs great, no problems with valve floating at all. it has 80,000mi. on it. my question is do i need to get new valve springs?

if you think so, why? and which ones would you recomend?
how much lift does the stock cam have? and what would putting the 1.7RR put it at?

thanks,
adam

My GT has 1.7 Crane Cobra roller rockers and at 120,000 miles i haven't had any valve float yet and i've had it up to 6,000rpm a couple of times (woops!). It's a good idea to replace them now since you're in there. The reason why is because with the larger pivot ratio you're pushing the springs down farther than they'd go with the stock rockers and when you start revving it any weak springs will have a hard time rebounding fast enough to keep the valve seated when it's supposed to be and you'll find out that your engine's power band seems to flatline at a certain rpm. That can be bad because if that's not at the end of the power band that's wasted power. Also, since you'll be having more spring travel, it will wear the springs out faster than they'd normally wear, especially if you flog your car often, so you may end up doing it down the road anyways. I hope this helped answer your question.

my car is mostly summer street driven, it never sees a strip. and wont.

i just bought it las summer from a friend of mine and he took care of it. no ragging on it.

my problem is trying to figure out if 80,000 well driven miles is too much to last a while with the 1.7RR's.

if anyone else thinks i should put new springs on, what kind and where can i get them. and dont suggest anything a college student cant afford...haha

thanks a lot,
adam

I'm not going to go shopping for you, but I do think you should replace the springs. Try Summit, Jegs, or Hawaii Racing.

Take care,
-Chris