I do not see why timing for a 153 or 181 would be different. The cranks and cams can interchange with a bit of fuel pump lobe interference. Rods are the same length. How different can they be? The stock HEI is good for more rpm than anyone but an all out racer would use, and few of them would actually get there.

Last edited by Beater of the Pack; 02/24/20 02:02 PM.

"I wonder if God created man because he was disappointed in the monkey?" Mark Twain