WTB 340 or 360 J Heads

[chademinent]

Like it says, looking for 340 or 360 Iron heads. I have a 318 but want some more airflow. I currently have a RPM intake ready to go on, just need the larger ported heads.

 

[detroit_inc]

Won't your 340 head valves hit the cylinder wall lip on a 318?

 

[chademinent]

I don't think so. to my knowledge the only difference is the combustion chamber is a little larger and the ports are larger as well. Some came with larger intake valves too. People have been putting 340 and 360 heads on 318s for quite some time now.

 

[detroit_inc]

Excellent. I was told you have to open the top of the cylinder wall on 318s to use x heads to clear valves when the engine is hot. That would be great if they were bolt on.

 

[chademinent]

Excellent. I was told you have to open the top of the cylinder wall on 318s to use x heads to clear valves when the engine is hot. That would be great if they were bolt on.

Yeah, Im not sure on the X heads, but Im after J heads or 360 smog heads

 

[moparmarkk]

Hi,i have several sets pm me mark

 

[chademinent]

Hi,i have several sets pm me mark

Awesome! will do

 

[OK charger]

The X heads are the 2.02 intakes. You have to notch the cylinders for those to fit a 318. The J heads have the smaller intakes and will bolt to a 318 no problem.

 

[detroit_inc]

The X heads are the 2.02 intakes. You have to notch the cylinders for those to fit a 318. The J heads have the smaller intakes and will bolt to a 318 no problem.

Thanks for the info. I thought X and J heads had same size valves.

 

[chademinent]

Thanks for the info. I thought X and J heads had same size valves.

Js should have 1.88s for the intake