Has anyone installed a mild [250/ 260/ 265] performance cam and kept the stock springs? I'm using stock 1.6 ratio rocker arms so don't see binding being an issue, just worried about valve float. Since the engine will never see any use beyond 4500rpm [and rarely that] is this going to be an issue?

Stock spring rate for my '83 motor is 197 lbs/in, other years are almost identical. Comp Cams recommends a 293 lbs/in rate [single] spring for all their 300 cams. Crane recommends a 438 lbs/in dual spring setup [which seems like serious overkill for a low rpm engine].

I'd like to stay with the stockers if they'll work. Less spring pressure = lower parasitic power loss and less wear. All thoughts/ suggestions welcome...

 

I bought comp cams kit k66-237-4. Im going to put in when I rebuild the engine here in a few weeks. It came with new springs which I do plan on using which are part number 903-12. I only plan on replacing them because the engine has over 314,000. I'll let you know how it turns out when I get it together.

 

My engine only has 77K miles on it... so the stock springs are still in great shape. Hoping to avoid digging in any further than I already have.

 

I would recommend changing the springs even though they are relatively low mileage. Valve float can destroy a valvetrain (and the rest of the engine) in a hurry. No sense taking chances when an extra hour of labor is all it takes to do it right.

 

i swapped in a crane 509501 (i think) with stock springs. not saying it was the best thing to do, but all is well.