Those are Dual Springs and will not fit your head if the valve spring locator at the base of the valve guide boss has not been machined away.lavron":10qfqmka said:I was looking a little more at the Howard's cam on Summit and see this is the recommended springs that Howard's has on their website;
Howards Valve Springs
Not sure if these would be of consideration as well?
See Ya,
Mike
The 263 spring rate is not enough.
The closed pressure at 1.700" is only 85 lbs.
I wasn't sure if you had new "never been used" lifters. I understood the part about needing a solid lifter for cam timing measurements.
What lifters do you have?