don't forget the heads were made to clear the roller lifters incase of r&r on cam and lifters.xntrik said:For general information.
Bear in mind that this information does not apply to all 302 cube Ford engines, whether called "302" or 5.0.
There are 302s with heavy crankshafts 28 oz/in. imbalance and 2 piece main seals from 68 through 81 (with block casting variations through the years),
then beginning 82 there are 5.0s with 50 oz/in. imbalance crankshafts, with 2 piece main seals,
then beginning late 83 there are 5.0s with 50 oz/in imbalance with one piece main seals.
then beginning 85 the 5.0 blocks were cast and machined for roller lifters.
Claims are that about 79 or 82 the block metal changed for the better and later engines have reduced wear characteristics and lighter thin casting techniques.
Most everything changed on the 302 cube engines as the years progressed. Not every part is directly interchangeable from year to year.