318 to 360 swap

[w200/m880]

Having awoken from hibernation [i hate the cold], i have obtained 15/8 long x 5/16 studs for 4 barrel manifold, fitted 1/4 spacer, drilled this for an 1/8 pipe to give me a vacuum take off for advance, fitted 318 throttle bracket, 360 throttle cable hold down which moves clamp up and away just got to get some suitable pipe for brake servo vacuum and pipe for blow by to get into the filter and i should be good to fire up the 360 with its quadrajet.

 

[w200/m880]

thermoquad,not quadrajet

 

[Elwenil]

So is this an engine swap or just a carb and manifold swap?

 

[w200/m880]

its a swop of a 79 360 where there used to be a cracked 318

 

[donnerwetter58]

Having awoken from hibernation [i hate the cold], i have obtained 15/8 long x 5/16 studs for 4 barrel manifold, fitted 1/4 spacer, drilled this for an 1/8 pipe to give me a vacuum take off for advance, fitted 318 throttle bracket, 360 throttle cable hold down which moves clamp up and away just got to get some suitable pipe for brake servo vacuum and pipe for blow by to get into the filter and i should be good to fire up the 360 with its quadrajet.View attachment 414053View attachment 414052

Find a vacuum diagram for a vehicle with a Thermoquad. Find the correct port for the distributor vacuum unit. The spacer under the carb will provide a manifold vacuum source. You need a venturi vacuum source for the vacuum advance. If you connect the advance unit to manifold vacuum, you will have full advance at idle. The vacuum advance port on the carb should have little or no vacuum at idle and vacuum should increase with increased engine speed.

 

[Super Warrantman]

thermoquad,not quadrajet

Beat me to it.

 

[w200/m880]

this late model carb didnt have a vac advance take off,point taken about full advance at idle though,ive read you have to drill into venturi port and didnt fancy doing that.

 

[w200/m880]

Carb is a 9097s tq and i now notice it doesnt have a port for brake booster on back of carb,so i guess i will have to take vacuum directly off top of manifold ?

 

[Nonotagain]

I hope that you used the balancer and torque converter from the 360, as the 360 is an external balanced engine.

Thermo-quads have issues with being warped causing fuel and vacuum leaks.

Long time MOPAR racer..

 

[w200/m880]

yes i used front damper,pulleys from 360,used b and m balanced flex plate so i could run original 318 torque converter,thermoquad is a newly rebuilt unit on a 1/4" soft gasket and as im not running it hard hopefully i wont get warpage.