Ok guys you might tell me that I'm stupid for asking this question, but I don't know and want the answer so here it goes....
Will it make any performance difference if I put 440 heads on a 383 block?
It's a 66 383 block off of a fury, and the 440 heads are off a charger.
Thanks
The Cylinder Heads on the 1966 '383' were {Casting #2406516}, which have valves sizes of 2.08" Intake / 1.60 Exhaust, with a 'closed chamber' combustion chamber {79.5 CC volume from the factory}.
The Intake Ports have a 'flat floor' on the runner side. The Exhaust Ports are tight in the bowl area
and have a 'bump' in the floor area. CFM flow is somewhat restricted with these Cylinder Heads, but with 'work' they can be useful on the street for low RPM Horsepower and Mid-Range Torque.
The 1966 '383' 325 HP 4-Barrel engine came thru with a 10.0-1 Compression Ratio, and the flat-top
pistons are to be set at {-.014"} below the block deck surface.
I'm guessing that you are talking about using the 440 Cylinder Heads {Casting #2843906}, which have valve sizes of 2.08" Intake / 1.74" Exhaust.
These heads were found on both the {1968 thru 1970} '383' and '440' engines.
These heads have very good ports, both in the bowl area and runners, and provide more
CFM flow {+10% Intake Flow and +18% Exhaust Flow} than the earlier '383' Cylinder Heads.
But, they came thru with 'open chamber design' in the combustion chamber, which has a
CC Volume of {88.5} from the factory.
Though these Cylinder Heads can bolt on the 1966 '383' engine, compression will drop almost
a full point {1.0} in a 'straight swap', costing you about {4 to 5%} in Horsepower.
What you gain in 'CFM Flow', you will lose in Compression.
Unless, you have the 440 'open chamber' Cylinder Heads milled.