Scat Cam and lifters, something is wrong Options

[Bruce Edge]

Hey All,
I was trying to get a motor built this week before going on a trip. All was going well until I bolted the rocker arm assembly on. If someone could at least give me some idea of what could be going on, so I can feel better about straightening it out when i get back.
1.7 stock, went with Scat c35 cam with lifters to match, so I could run dual carbs. New P&C stock, rebuilt heads stock, no fly cuts, stock original springs, original alum push rods.
When I rotate crank, it binds or lock up with valve springs depressed. Valves are adjusted. I can pull rockers off and crank spins freely.
has anyone heard of a problem using stock rocker and push rods with this Scat cam.
I measured lifters, push rod sets about .07 deeper in scat lifter. Also noticed where push rod seats in Scat lifter, there is not a taper like the stock lifter, and push rod can hang on edge of dished hole. Sorry for all the rambling and if I not making sense, just dis regard.
Just trying to get some peace of mind before leaving town.

Thank for any suggestions,
Bruce

[Bruce Edge]

Hey Mark,
Thanks for looking at my post. I think lift on that cam is 381".

Thanks.
Bruce.

[Mark Henry]

Hey Mark,
Thanks for looking at my post. I think lift on that cam is 381".

Thanks.
Bruce.

At the cam, .381 X 1.3 rockers = .495 total lift at the valve.
That's a fair bit of lift, the hot cam I have in my 2.6L (102x78mm) only has .012" more lift at the valve. Where I got the specs from, aircooled.net says "HD springs required".

You can use a set-up on a drill press with a rod and a dial indicator so you can see when you reach spring coil bind.