Product details:
Manley one-piece 4130 chromoly pushrods are rated to 128,000 psi. Features swedged end, .080 inch wall, and 5/16 inch diameter. Heat treatedBlack oxide finishFor hydraulic or solid flat tappet cam engines with less than 400 lbs. open spring pressure and under 7500 rpmSet of 16Pushrod Application Chart(GIF)