Some Head Flow Numbers

I had one of my heads flowed at Katech while the engine is apart and waiting for some different pistons.

Heads are AFR 220s that have been "hand ported to the max" per the guy I bought them from.

They're flowed on a 4.03" bore and the exhaust was flowed with a 6" tapered straight pipe, intake was flowed with a 3/4" radius adaptor.

Interesting to say the least. I expected the intake to be higher, but I doubt you'll find a more honest flowbench. Exhaust numbers should work well with the blower.

Intake:
LIFT L/D FLOW
0.10 0.048 63.1
0.20 0.096 130.9
0.30 0.144 187.6
0.40 0.192 237.3
0.50 0.240 267.4
0.60 0.288 284.2
0.70 0.337 292.2
0.8 0.385 293.1

Exhaust
LIFT L/D FLOW
0.10 0.063 50.7
0.20 0.125 107.3
0.30 0.188 153.1
0.40 0.250 190.4
0.50 0.313 222.5
0.60 0.375 239.8
0.70 0.438 249.2
0.80 0.500 250.1

Sound about right?

Sounds like an actual honest flowbench to me. We've flowed a few sets of AFR210's and 220's at Thunder Racing. Depending on the level of porting, they range from 280 (210 Race Readies) on up to 296 (220 Competition).

At what lift did those heads flow those numbers?

I also don't know what effect the radius adaptor for the intake side has on flow numbers. Is it standard practice to use one when flowing heads?

A local Houston head porter ported both sets of my LT1 castings. He said the flows were 275/195 and I took them to GTP to have them independently flowed. They were within 2 CFM of my head porters claims. This was at .600 lift and using Stainless Ferrera LT4 valve sizes(2.00/1.56). Those numbers beat stock Brodix Track 1's out of the box. Both cars are street/strip and have plenty of low end grunt.

At what lift did those heads flow those numbers?

I also don't know what effect the radius adaptor for the intake side has on flow numbers. Is it standard practice to use one when flowing heads?

Those were the peak numbers (all my pea-brain can remember).

The radius adapter on the intake is standard-practice. The pipe isn't always used on the exhaust, though.

Mike

Jacob, those numbers with or without a pipe on the exhaust? Either way the exhaust has some nice numbers!

. . .the exhaust was flowed with a 6" tapered straight pipe, . . .

The numbers were decent for pipe'd.

Oh, whoops, didn't see that lol. They still look pretty nice for pipe'd; I don't recall seeing too many setups posted on here with those kinda numbers.