I have a Teague 509 blower motor ( the 800hp) with their custom cam, sorry I dont know he specs. I just winterized it and backed off the rockers . I know the springs are 8 years old and have not been replaced or backed off while in storage before. Should I take them out and replace them. I would think it is cheap insurance. Then again I have heard new ones are not necessary and may break during break in , the old ones have lasted through the break in and been service proven. The springs are Crane # 99895 heads are ALUMINUM BRODIX 2x