Does anyone know if these springs are a direct drop in or if there is any machining required of the spring pockets for these. my buddy is going to run these with a cc 306 cam and was wondering if these would work.. cuz he already bought them.

 

No machining required. They will work fine.

 

they have a lot of spring pressure, hope he has aftermarket lifters

 

With the stock heads the height of 1.85 will not be able to be reached with standard locks, get some +.050 locks and shim it up to the right height.

 

On a stock head I ran .050 locks and retainers with a .060 seat. You need to measure though!