heads and bore

[spade33]

so i have a question would the afr 165 cc heads fit on a 289 non roller motor? and if i did that and ended up getting them now could i switch the heads to a 302 out of a 89 later in life? or would that not be any good? also the motor i have i ugess in my 289 is bored 30 over? what exactly does that mean or change about the motor

 

[mustangdave]

All 289's are non-roller.
Yes, they should work on a later 302.
30 over is actually .030 inches of overbore in the cylinder. When the bores wear, they are overbored so the rings will seal and control the oil.

 

[Max Power]

Both 289 and 302 share the same bore. Your biggest issue will be whether the valves hit the pistons.

 

[spade33]

so would it be possible to put the afr's on my 289 then later on put them on a 302 from an 89 so go from non roller to roller on the heads or woudl it make a diffrence

 

[jtfairlane]

The answer is YES. The main thing you have to consider is that roller 5.0s come from the factory with pedestal mount rockers, while 289s are stud mount.