318 head porting for the average joe
After testing I initially decided to work the push rod wall at and beyond into the bowl..since the air seemed to be really moving there...but then looked at the bowl and decided it needed more work on the straight side...so i worked the straight wall at the bowl and up between that side of the guide some, as well as the far side of the bowl just a smidge. I did however lose 4 cfm @.400 lift...but there were more gains below and above to really call it a loss..
The push rod pinch imo is coming into the picture....so tomorrow i will go there and report.
Fresh 3+ angle wold help too of corse, but remember this is for the sake of the guy who would like to pull'em off , do some porting, and then bolt'em back on..so a new VJ is optional..lol..it could only add a few cfm at the least and actually equalize the flow range at mid lift.
The numbers after that
---cfm@lift----cfm gain over stock flow
.100--66---------------20+
.200--131--------------23+
.300--173.3------------16+
.400--181.4------------12+
.450--188--------------didnt check stock .450
.500--190--------------19+
.550--192--------------19+
.575--195.6------------20+
I also did an exhaust port that Ill flow tomorrow, I have pics of that as well that ill go ahead and post now for something to look at till tomorrow.
After testing I initially decided to work the push rod wall at and beyond into the bowl..since the air seemed to be really moving there...but then looked at the bowl and decided it needed more work on the straight side...so i worked the straight wall at the bowl and up between that side of the guide some, as well as the far side of the bowl just a smidge. I did however lose 4 cfm @.400 lift...but there were more gains below and above to really call it a loss..
The push rod pinch imo is coming into the picture....so tomorrow i will go there and report.
Fresh 3+ angle wold help too of corse, but remember this is for the sake of the guy who would like to pull'em off , do some porting, and then bolt'em back on..so a new VJ is optional..lol..it could only add a few cfm at the least and actually equalize the flow range at mid lift.
The numbers after that
---cfm@lift----cfm gain over stock flow
.100--66---------------20+
.200--131--------------23+
.300--173.3------------16+
.400--181.4------------12+
.450--188--------------didnt check stock .450
.500--190--------------19+
.550--192--------------19+
.575--195.6------------20+
I also did an exhaust port that Ill flow tomorrow, I have pics of that as well that ill go ahead and post now for something to look at till tomorrow.