26-09-2017, 04:31 AM
Many heads have been planed to further increase power (and problems). Originals nominally 1.5 inches deep. check enough thread on studs.
And somewhat off the subject but the 4.9 cars in 2nd pull about same rpm as 5.25 cars in 3rd. I found on my car with later head and minor mods, with snappy gear change, 30 mph or more could be maintained on many hills whereas previously a tedious (and now dangerous) 20. Ridiculous though it seems today could through the 1960s easily overtake many trucks and busses.
And somewhat off the subject but the 4.9 cars in 2nd pull about same rpm as 5.25 cars in 3rd. I found on my car with later head and minor mods, with snappy gear change, 30 mph or more could be maintained on many hills whereas previously a tedious (and now dangerous) 20. Ridiculous though it seems today could through the 1960s easily overtake many trucks and busses.