308 Vs 915 exhaust ports
I have read through out the years how superior the 308 heads are compared to the 915. I just removed a set of 308’s off my new to me 360 project, one head is cracked for sure the other would need to be fluxed and pressure tested. I see the combusting chamber is slightly better in that it’s visually smaller, but so is the intake and exhaust ports by a significant margin. The bowls appear to be better in the 308’s, but i would need to do some serous hogging to get the exhaust ports to open up compared to the J’s. Those 308’s ports appear to be 318 exhaust port size to me. I will run the 1.88 J’s they should clean up nice.
I have read through out the years how superior the 308 heads are compared to the 915. I just removed a set of 308’s off my new to me 360 project, one head is cracked for sure the other would need to be fluxed and pressure tested. I see the combusting chamber is slightly better in that it’s visually smaller, but so is the intake and exhaust ports by a significant margin. The bowls appear to be better in the 308’s, but i would need to do some serous hogging to get the exhaust ports to open up compared to the J’s. Those 308’s ports appear to be 318 exhaust port size to me. I will run the 1.88 J’s they should clean up nice.
