390 heads
becidajim
03-01-2008, 08:41 AM
i would like to know if heads from a 1974 390 will fit a 1966 390 engine casting # c6me-a on block of 66 engine thanks jim
MagicRat
03-01-2008, 01:30 PM
They will fit just fine.
The '66 and '74 390 heads are virtually identical, including valve size. But the '74 head has a larger, lower compression chamber, resulting in slightly less power.
But you will gain hardened valve seats so it will run very nicely on regular unleaded gas.
BTW, welcome to AF!
The '66 and '74 390 heads are virtually identical, including valve size. But the '74 head has a larger, lower compression chamber, resulting in slightly less power.
But you will gain hardened valve seats so it will run very nicely on regular unleaded gas.
BTW, welcome to AF!
Automotive Network, Inc., Copyright ©2025