Anyone have a nice broad data set of flow bench data on the Stealth Ram and the AFR 180 Competition 75 CC heads (as delivered from AFR)? I can use 65cc chambers as well if that is all that is available. I am working on my future engine combo in Engine Analyzer Pro and would like a better set of information than supplied on the AFR website (too few lift points and nothing up to .6" lift).

Dimensional/ flow bench data on the HSR would be great as well. I am currently using data I took off mine but I have doubts as to the accuracy of my measurements. I am currently using 259.3 CU IN for the plenum volume, and a runner diameter of 1.94" on a length of 8.5". I got a measurement of 6.5" on the runner but saw a total runner length on another forum in the range of 12", thus meaning the HSR is in the 8" range. What's the true info?

I appreciate all your help and input with these values!

 

What cubic inch motor are you going to be using those heads on?

 

I'm aiming to go 383.

 

You have probably had this discussion before but would you not be better served with the AFR 195 heads?

 

I am definitely going to be using the car more on the street rather than at the track. I am trying to put together a combo that is not focused on max power, but being very potent while retaining good drive-ability. I did a bunch of simulations with the 195 head, but this time around I wanted to tone it down a bit with a combo focused on low-end torque production. If you think I am missing something on this, please feel free to point it out.

 

you wont have problems making low end with the 195's. I dont think the 180's will have much more torque production capability over the 195's. There are lots of data on these forums and others on the 195's but i havent seen 180 flow numbers from independant resources. I have no reason to doubt they are within spec from AFR, as the 195's and 210's i've seen match AFR's numbers, and sometimes exceed them. I'd use the data from AFR for simulation purposes.

If you want torque, do you have to use the HSR? First TPI would dominate on torque for a street car. HSR would dominate more on top end however


Edit: then again a magazine did a 180cc test on a 406 i beileve and it was a true stump puller. 180's on 383 will work I just think you are abit better suited to a 195cc runner with the HSR. Overall performance will give you best of both worlds, low end torque but also a flat torque curve, and also some top end capability with the larger runner head which is where HSR wants to be.

Dimensions on the HSR look to be right, i think I had measured my runners to be in the 6-7" range. Flow data? Do not have except from what I heard over at corvette forum and LS1tech, where a company was modifying them for LT1's and corvette hoods. They say they are in the 268-275cfm range per runner. This would be good for the AFR 180's but if you port match the runners to AFR's 195cc port, flow should open up to 280's cfm which match the 195's

 

Orr89RocZ,

Thanks for the input! I will definitely take a look back on the 195's with the smaller cams I am trying out.