To change or not to change...
A couple of questions, does it have automatic or manual 4 spd trans ? Thinking it probably has the single plane intake manifold in '67 ?? If it has dual plane intake manifold then it will probably run a little nicer as a driver.
'67 273 2 bbl came factory at 8.8:1 compression ratio and made 180 horse power.
The 2 bbls can be gas leakers, and are pretty much an economy carb.
Did the 4 bbl swap on a '69 318 2 bbl with the Mr Gasket 4 bbl adapter. Granted this was the 230 horse power 9.2:1 factory 2 bbl engine, dual plane intake, so it made use of the extra fuel better. Was nice cause did not have to pull the intake manifold, and the port matching at the heads stayed correct, unlike other 4 bbl manifolds that are swapped on.
The whole tone of the engine deepened up from the added fuel it was recieving with the 4 bbl on it.
The 2 bbl was a gas leaker and a fire hazard, ran pretty crappy too. So right there
were a couple of reasons for me to do the swap, plus I wanted the added benefit of the secondaries.
1406 Edelbrock electric choke carb, started and ran real nice, that was a big improvement in it's self. No rejetting was required.
So yes I was very happy with the 4 bbl conversion and results, made a nice change to the driveability of the whole car.
Your experience may be a little less performance, but the nice starting and nice running engine could be worth your effort.
PS: If you don't have a Mopar High Torque Mini starter on it, put one on. It will start like it has fuel injection, they spin lots faster.
Also the mini starters are engineered to take way less electricity to run them, so the added benifit is that your ignition system now gets a boost to help start your engine quick too.
The big heavy original mopar starters drain a lot of juice as you are cranking them to start your car, robbing the juice from your ignition system.
A couple of questions, does it have automatic or manual 4 spd trans ? Thinking it probably has the single plane intake manifold in '67 ?? If it has dual plane intake manifold then it will probably run a little nicer as a driver.
'67 273 2 bbl came factory at 8.8:1 compression ratio and made 180 horse power.
The 2 bbls can be gas leakers, and are pretty much an economy carb.
Did the 4 bbl swap on a '69 318 2 bbl with the Mr Gasket 4 bbl adapter. Granted this was the 230 horse power 9.2:1 factory 2 bbl engine, dual plane intake, so it made use of the extra fuel better. Was nice cause did not have to pull the intake manifold, and the port matching at the heads stayed correct, unlike other 4 bbl manifolds that are swapped on.
The whole tone of the engine deepened up from the added fuel it was recieving with the 4 bbl on it.
The 2 bbl was a gas leaker and a fire hazard, ran pretty crappy too. So right there
were a couple of reasons for me to do the swap, plus I wanted the added benefit of the secondaries.
1406 Edelbrock electric choke carb, started and ran real nice, that was a big improvement in it's self. No rejetting was required.
So yes I was very happy with the 4 bbl conversion and results, made a nice change to the driveability of the whole car.
Your experience may be a little less performance, but the nice starting and nice running engine could be worth your effort.
PS: If you don't have a Mopar High Torque Mini starter on it, put one on. It will start like it has fuel injection, they spin lots faster.
Also the mini starters are engineered to take way less electricity to run them, so the added benifit is that your ignition system now gets a boost to help start your engine quick too.
The big heavy original mopar starters drain a lot of juice as you are cranking them to start your car, robbing the juice from your ignition system.