I bought a set or AFR 210 comp ported LT4 heads.I know the flow numbers on the AFR website are inflated.I was wondering if anyone has any bench flow numbers from a set.

thanks
Dave

 

anyone?

 

The sets I have had flowed are always on par with AFR's numbers.

 

It is hard to compare numbers from different flow benches,and harder with different heads.
Other benches can be just as "happy" as AFR's. Ya got to realize that's the way they make their living-- Happy benches make big numbers= more head sales or porting jobs.
Get your heads flowed and see if the numbers are the same.

 

I built an engine and I just got my 210cc Competition heads flow numbers. When I see big flow difference @.500 - @.550 I called Thunder and they told me they use a superflow 1020 bench which gives very conservative numbers.

From AFR's web site: (210cc Competition)

.200 138 / 112
.300 201 / 150
.400 247 / 190
.500 276 / 207
.550 282 / 213
.600 288 / 220

My head flow numbers; (Same heads)

.200 138.3 / 114.9
.300 192.9 / 164.2
.400 239.7 / 197.8
.500 263.4 / 212.5
.550 273.7 / 217.5
.600 282.7 / 219.7

 

Thats well within the small percentage that AFR claims.

Mine were slightly less than AFRs numbers , but only by a high of 3 cfm. Like yours my exhaust actually flowed better than AFRs numbers.

CFM on a bench only tells about half the story anyway.

I bought these heads years ago when I was running a 355 in a 93 T/A , I had a set of stock casting ported, bigger valve LT1 heads on the car that flowed just under 260 @ 550 lift. I blew a head gasket and it really messed up the deck of one of the heads, so I bit the bullet and bought a set of AFR 190s to replace them. My best time before the AFRs was a 12.29 @ 111 mph. With no other changes but the heads (even went with a thicker gasket , Impalas with the stockers, Fel pros with the AFRs) I beat my best time IN WARMER WEATHER and gained 2 mph !!! Now When I took the heads off and put them on my 383 I had them freshened and flowed, like I said they flowed right along the lines of AFRs website numbers within a few CFM, and the exhaust flowing better. Later on I switched cams and also went to a thinner head gasket to gain some compression (fel pros to impalas now on the 383) While I had them out I unshrouded the valves, smoothed the chamber and had a better valvejob done (also blended the valvejob), I picked up several CFM from this alone to where I had the defecit of 3 cfm I now had a gain of 2.

 

This is good news.
thanks alot for the replies

 

My engine isn't shipped yet. Its a 383cid with 240/246dur. 573/582lift 112.7lsa camshaft with flow numbers above. (97 Camaro T56 with 10 Bolt) What will be my HP or RWHP in your opinion??

 

~400rwhp.

 

So with %15 drivetrain loss you say 470hp at flywheel. I wish to see ~430rwhp

 

What compression (static ) are you starting with.

I know my car with just above 10:1 and the GM 847 traps from 117 to 118 mph car weights 3750 with me in it (I'm almost 240#).

I'll guess with your set-up and a static 11:1 compression that you'll easily make 410 to 430 RWHP, but what to look for will be the nice big fat torque curve , even with that big cam.

If you trap below 120 mph in the 1/4 I'll be surprised.

 

Nice numbers, I wish I had the $$$ for a set now. College sucks

 

SCR: 11:1 I don't want to be a dyno queen. I ask because It is a street/strip car. I will take her to drag maybe just a few times a year. I hope the camshaft will not be a problem.. Have you got any problem with gm847? is it drivable?

 

On the 847 , I have no real issues with it except, it is ahog on gas down low.

I plan on adding some compression to help rectify all that, but until then I just hold my nose...lol

 

haha If you add the cats and connect the air pump, could that work?

whats your gas mileage?

ps: These all out of subject, but I think you got what you want right rock1501?