mkpola

Putting a .501 lift cam in my olds 350 was wondering how high of a lift can you go with the stock springs, the cam calls for dual springs. The only problem is this is being done on the engine stand, the cam manufacture says to break in the cam use the outer springs only. that means once I install the engine, break in the cam, then take it apart to add the inner springs. Got to be a easier way. its a 72 olds 350. Thank you.

krooser

What are the duration specs for the cam and how high do you expect to rev it?

Stock springs will limit your rpm's... for a mild cam you can get single springs with pressures you need for performance and still be able to break-in the cam without worries IF you do it right, uses lots of cam assembly lube and a good break-in oil with lots of zddp.

mkpola

duration at .50 224/224 advertised duration 270/270

mkpola

5000 to 6000 tops rpm

J-(Chicago)

So break it in with the stock springs, and add the correct ones later. I don't think they'll bind up on you. the cam isn't huge.

krooser

What spring pressure's are recommended? My 330 cam is a .500 lift... uses 125# on the seat and 320# open...

Run to Rund

Check that the retainer to guide/valve seal clearance is enough. It is probably OK. I know it seems a lot of work, but break in is critical. Use good moly cam lube for break in. And, btw, stock retainers don't have a good shoulder for inner springs. I have used Isky 507STA retainers and 11/32 locks for decades.

64Rocket

After you break the cam in, you can install the new springs with the heads on. You need a air compressor and a small valve spring compressor. Not a hard job, just bending over the fender a little troublesome.

Gene