There are 4 different 318 4-bbl intakes made for FMJ cars.
- There is the normal 318 4-bbl intake (318 cylinder head port size) that used a Thermoquad ('76ish to '84)
- There is the '85-91ish (pre-Magnum) 318 4-bbl that uses the Rochester Quadrajet. This intake has the same casting number as the one mentioned before – but the external choke thermostat is NOT machined. The Quadrajet uses an internal choke thermostat vs. external choke that Thermostat's used.
- There is the same two versions used for the police 318 4-bbls – which use the 360 port size heads (which ironically is the same intake used for pre-Magnum 360 4-bbl pickups/vans). The '85-92ish 360 intakes are also not machined for the external choke thermostat like the normal 318 4-bbls are (as mentioned above).
There is a lot of machining needed to make a Q-Jet intake to work for a TQ – to the point I will not recommend it.
That said, a TQ intake will work just fine for a Q-Jet.
Now off to a different subject. The combustion chambers are much higher (cast deeper into the head) for 360/police 318 heads – so taking 360 heads/intake (or police 318 heads/intake) and placing on a 318 2 or 4-bbl engine will knock your already low compression engine down even lower – to the point it's like shooting your foot with both barrels of a shotgun (instead of of with a 22).
Even using police 318 pistons will still result with compression being less than desired.
If a person was to get aftermarket or custom pistons for the 318, to get compression to a more desirable number – then you might have a winning combination.
BudW
- There is the normal 318 4-bbl intake (318 cylinder head port size) that used a Thermoquad ('76ish to '84)
- There is the '85-91ish (pre-Magnum) 318 4-bbl that uses the Rochester Quadrajet. This intake has the same casting number as the one mentioned before – but the external choke thermostat is NOT machined. The Quadrajet uses an internal choke thermostat vs. external choke that Thermostat's used.
- There is the same two versions used for the police 318 4-bbls – which use the 360 port size heads (which ironically is the same intake used for pre-Magnum 360 4-bbl pickups/vans). The '85-92ish 360 intakes are also not machined for the external choke thermostat like the normal 318 4-bbls are (as mentioned above).
There is a lot of machining needed to make a Q-Jet intake to work for a TQ – to the point I will not recommend it.
That said, a TQ intake will work just fine for a Q-Jet.
Now off to a different subject. The combustion chambers are much higher (cast deeper into the head) for 360/police 318 heads – so taking 360 heads/intake (or police 318 heads/intake) and placing on a 318 2 or 4-bbl engine will knock your already low compression engine down even lower – to the point it's like shooting your foot with both barrels of a shotgun (instead of of with a 22).
Even using police 318 pistons will still result with compression being less than desired.
If a person was to get aftermarket or custom pistons for the 318, to get compression to a more desirable number – then you might have a winning combination.
BudW