The 250 valves are lighter than the 300 valves.
You can use use 110 lbs of seat pressure with a 330 lbs/in spring rate.
The valve springs that fit into that category have ODs 1.440" and larger.
Need to know the spring OD that will fit in the spring pockets in the head?
Need to know what the present installed spring height is?
I'm assuming the rocker arm ratio will be 1.5?
You can use use 110 lbs of seat pressure with a 330 lbs/in spring rate.
The valve springs that fit into that category have ODs 1.440" and larger.
Need to know the spring OD that will fit in the spring pockets in the head?
Need to know what the present installed spring height is?
I'm assuming the rocker arm ratio will be 1.5?