340 J-head flow rate ??

Locomotion said

Just remember that different flow benches can provide different readings from the same head. Also that due to production quality/casting irregularities, different heads with the same casting numbers can provide different numbers too - even from port-to-port. It's a very good reference but not a "tell-all".

Click to expand...

Myron is correct, great reference but not a tell all.

I know some guys that flow SB Mopar heads on 4.250" bore fixtures. How many of us have a 4.250" bore SB mopar. Not many that's for sure. The numbers tend to get inflated because of it. Something more in line with what it's actually going on will get you a representative number for the bench, say a 4.100 bore.