What length pushrod do I need for a 45 degree block 425? Is it the same as the 39 degree block? Should I spring for the restricted
pushrods? Its going in a mostly stock 425 with hydraulic lifters. If the block is decked and the heads are given a minimal mill for flatness do you recommend custom length pushrods?

 

Yes, always measure the length push rods that are needed for YOUR engine. Any machining to the block deck or head surfaces, different head gasket thickness, camshaft base circle diameter, and valve stem height will all affect the length pushrod needed for correct valve train geometry.