I would call PAC valve spring CO. at 866-799-9417 and see if they have a set of valve springs, no matter which diameter, 1.625, 1.550, 1.525 or what ever will work for your heads at that installed hieght with the lift and pressures you need I would also look at buying thier matching tool steel 10 degree retainers and 10 degree keepers or the titianum retainers if the springs you select DON'T have inner dampeners