Missed on this combo?
I'd like to see 275+ intake cfm by .500
Same. Those numbers are WAY off what hughes says (You did mention full cnc right? That's the numbers I am using). Here:
Hughes
.100 72
.200 149
.300 221
.350 245
.400 266
.450 285
.500 296
.550 301
.600 303
.650 304
.700 305
You
.200 136
.300 185
.400 230
.500 259
.600 283
.700 294
.750 300
I mean you're 30+ cfm off through the mid-range. That's just crap. 30+ cfm is a lot of horsepower. Sure, the AVERAGE motor won't notice it. But a motor with the right intake, cam, exhaust, etc, sure will. The BIGGEST thing I'm noticing here? The lack of CFM gain. It's great to say "oh my heads flow 300 cfm". But the MORE important part, is how soon they get there. That's the sure tell sign of a good port. Sure, your heads flow 305 cfm, at .700 lift. But what about lower? Where you actually use it. For example. Lets say you have two heads. Head A flows 300 cfm at .700. Head B flows 275 cfm at .700. BUT head B, hits that number at .500 lift. Where head A only makes 225 cfm at .500. Which head you going to take? I'll take head B everyday. How quick the CFM gain is, tells you how well the head flows. And your's don't flow any better than a ported J head. Here's info from shady dell.
Ported J head 2.02 valve
.100 62.1
.200 135.2
.300 198.7
.400 239.8
.450 253.9
.500 258.4
.550 264.9
.600 254.6
Almost EXACTLY the same numbers as your head. CFM gain is almost the same too. So basically up to .600 lift, a good ported set of J heads makes the same power. Not really impressed with hughes CNC job at this point. And yes. The edelbrocks are a "stock replacement" style head. So they will always have that limitation. But 30+ cfm missing in the mid-range? Yeah that's crap. The CFM gain being very similar to a port J head tells me there really isn't any good work done on the port.
Now I'm also not saying that the heads are THE reason you're down on power. The head's flow good (just not great, and no where near where hughes said they would). They should support lots of power (just maybe not 600 horse). But to me they are a part of the problem. 185 CFM at .300 lift? 259 cfm at .500? Ported J head territory. Nothing to write home about there. The lack of CFM gain on the lower levels of lift is a part of why this motor is soggy on the bottom end. That along with I imagine is your low compression. Did you ever get cranking compression numbers? If no, CC the chambers and post your cam intake valve closing (prefer at seat) and we can figure out your DCR. Like I said before. I imagine it's a little low.
Also dammit RAMM you beat me to it lol.
