i have been looking at the BPE 205 CNC head and also the Hughes Engines CNC RPM head. when i go onto the Hughes site and look at the flow #'s, the are way better then BPE. this is what i took off Hughes site,

RPM CNC (not bigmouth)

lift INT EXT
300 221 156
400 266 185
500 296 206
600 303 218

BPE 205cc CNC

lift INT EXT
300 197 186
400 249 208
500 275 215
600 291 222

is the RPM head the better choice?

I never assume flow numbers gleaned from different benches can be compared as truly "apples to apples".

Same for dyno results from different dynos.

Just my opinion, but I would be Rod's head will make significantly more power, probably more than the bigmouth as well.

Go to forabodys only and look up big mouth heads you will be shocked when you see the real numbers off of 2 other benches not even close to what hughes web site says like 20 cfm lower then what they say they flow

All I'll add is a local guy built an engine with Hugh's ported Edelbrocks (not big mouths) and it didn't perform as expected so he called me to flow test his heads. I was busy at the time so another local Friend flow tested them for him. He was not happy at all especially after my Friend said he couldn't even correct the issues. He bought a set of BPE heads and I didn't hear the results but I expect to hear much better news.

i have heard that Hughes #'s are a bit off. it looks very good on paper but if other people have tested them on there benches and got different results, it's no use getting them.

with the exhaust flow higher, does that mean more efficient? i'm no engine builder but want to learn.

I have no idea which version of the Hughes CNC program this was.... It was from about 3 years ago.
2.08 intake valve, fully CNC ported, did not need offset intake rockers.
The thing I remember most about it was how low the intake short turn was.
I didn't think you could take that much out without hitting water.


4.00" bore, no tube on exhaust, radius plate on intake.
Intake flowed 281 @.700, exhaust 203.

Eddy CNC from MCH done back in 2010

Edelbrock heads STOCK max out at 243 average on my bench. I can get them up to an honest 315 with a 2.08 valve and without moving the pushrod (tubing them and touching the tube) it takes LOTS of work and I flow every single port (and test air-speed) on the head multiple times to get it there. I bought a set of Harlan Sharp .350 off-set rockers but so far the little bit of tinkiering I've done the results have been disappointing. I will make it pay-off with testing sooner or later. The nice thing about the later style Speedmaster and ProMaxx heads is you can play with the floor more as there is more meat and less water passages.

When I ported my RPM heads I just keep one runner of intake, exhaust, chamber and valve job untouchable to have comparison of my porting in the same flow bench.

As John said, best flow that I found as cast on intake was 244@.600".

Some pictures:

Intake: Ported vs Cast



Chamber: Ported vs Cast



Exhaust:



On Flow Bench



Flow Chart:

See how your flow number dropped from 300@.600 to 292@700? I'm betting if you check air-speed at the short-turn its over 410 FPS. If you widen the port there and slow the speed it will flow more. Its skipping the short turn some right now I'm betting.

Will let you know in next week or so having a set cnc and then taking them to Dwayne to see what they flow

Fully ported Magnums by Hughes. Their #'s fall right in there with what has been posted on this thread. Haven't seen any ET improvement over the fully "home" ported cast iron Magnums I was running. The push rod tubes could cause more turbulence than they are worth?

I would buy Rods heads over the Hughes heads ive seen them both up close and Rods heads are very nice

If the BPE heads flow anywhere close to 290cfm unported, they should work well.

Working with a semi-clean sheet of paper, as they did....... I don't think it would be that hard to improve on the rpm head.

BPE heads are CNC ported as delivered. Brett was involved in the port design. Bischoff( BES racing engines)does the CNC porting and valve job. Both those guys know how to make proven power. Extremely nice work. Looked at the heads last summer at Norwalk.
I think they will capably support 650 horsepower with right combination.

here is the thread. it's really long. i'm posting a link that takes you to the post with the pics of the BPE heads.
i don't think the BPE heads got flowed but the motor was supposed to be dyno'd this past monday, the guy hasn't posted any results though...
http://www.forabodiesonly.com/mopar/threads/missed-on-this-combo.374177/page-14#post-1971634567

long story short, the torque was soft at lower rpm's. the guy figured out his Hughes rockers arms weren't actually 1.6 ratio. he found out the hughes heads weren't flowing as much as he expected and RAMM said his experience with some similar Hughes heads was the short side was weird.

will be interesting to see if the motor makes more power with true rockers ratios and the BPE heads...

I was under the impression that the smaller version were "as cast".

You're saying both versions are CNC ported?(I'm asking...... I don't know if they are or aren't)

Both are cnc ported but the bigger cc ones require offset rockers

It wouldn't have a 195 cc intake if it was as cast. Aren't the edelbrock type castings 170 something as cast?