[JRSully]

I put hardened seats in my 70 291 heads on the 70 L78, didn't want to deal with lousy gas issues and the engine gets hammered on regularly. My engine dyno'd at about 428hp at 5600 rpm, dead stock except roller rockers, pertronix and headers, orig intake, compression, 4557 holley, stock heads, nos 143 cam. You need somebody experienced to do the valve seats right, have to watch the water jackets