Cylinder head dyno shoot out
- Thread starter NC Engine Builder
- Start date
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100% agree!
It may be interesting to see how much valve the CNC heads, though. IIRC, SM listed their CNC heads at 2.02 and Pro Comp as 2.08. Maybe see what flow and dyno results show with some 2.055 and 2.125 valves.
gzig5
Well-Known Member
I've got a brand new standard port M1 single plane I could loan as well as a set of ProMaxx 171 (non-CNC) heads. Have an extra 340 block that I could "loan" if I can drop it off. Don't care to ship something like that.
Ironmike
Well-Known Member
That sounds like my engine.I'm running a bit more lift though. .668/.668.
NC Engine Builder
Grumpy Old Man
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Well, might change it up a bit, I realized I have a rotating assembly allready done for a stock stroke 360 I was going to enter in a build contest that never materialized. Anyone have any issue if it's a 365 instead of a 408?
junkyardhero
Well-Known Member
i personally don't. i think that a combo that is more in reach of us average joes and typical pocketbooks would be quite beneficial.
don't get me wrong, i like the idea of a gnarly cammed 408, but a stout 360 is more of a reality to the wider audience.
33IMP
Well-Known Member
I'm a big block guy (the only small block I have is a 273, sitting on the floor) but I'm curious. I might build a 390/318 for by 67 barracuda notch.
If that makes you less cranky or grumpy, absolutely not.
Good baseline mill to work with.
I'm off to look for a thread I can derail. LOL
Sounds like a fun time, it will be interesting to see how much rpm some of these heads can support on a 3.58 stroke.
Newbomb Turk
Well-Known Member
I’m all for testing the W2 head against the other heads but I will say to be fair the W2’s should be the closed chamber version and not the open chamber heads.
Not because the OC is bad or anything else like that but because to do the OC head correctly you need the pistons to come out of the hole to get quench.
IOW’s the two different chambers require two different pistons.
@lead69 and I have discussed this many times and we’d do the testing if you were closer. We would do the testing but you are on the other coast.
So that makes that part of it difficult.
Other than the piston issue I think it’s a great test.
One more thing. Most of us watched what happened on speed talk with Eric Weingartner and all the crap he took about the testing being done incorrectly and how the results are not valid.
According to the arrogant pricks that hang out there any testing not done at the Pro Stock/asscar/F1 level then the results are meaningless.
So you’ll hear **** like that. And who knows what else the critics will claim.
Other than those two things I say it’s on like donkey Kong if you can get everything in order.
Not because the OC is bad or anything else like that but because to do the OC head correctly you need the pistons to come out of the hole to get quench.
IOW’s the two different chambers require two different pistons.
@lead69 and I have discussed this many times and we’d do the testing if you were closer. We would do the testing but you are on the other coast.
So that makes that part of it difficult.
Other than the piston issue I think it’s a great test.
One more thing. Most of us watched what happened on speed talk with Eric Weingartner and all the crap he took about the testing being done incorrectly and how the results are not valid.
According to the arrogant pricks that hang out there any testing not done at the Pro Stock/asscar/F1 level then the results are meaningless.
So you’ll hear **** like that. And who knows what else the critics will claim.
Other than those two things I say it’s on like donkey Kong if you can get everything in order.
NC Engine Builder
Grumpy Old Man
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I may have to simplify the various heads to keep the variables more consistent. Maybe the first session I'll concentrate on the speedmaster, bloomer, edelbrock, trick flow and the pro max someone mentioned
Keeping the shortblock consistent may not give us optimal outcomes for each head but it will give us a better sense of how they compare .
Not having perfect quench can be overcome to a point by adding a little race fuel after baseline run .
The W2s will like more compression , cam and rpms .
Not having perfect quench can be overcome to a point by adding a little race fuel after baseline run .
The W2s will like more compression , cam and rpms .
Brian Hafliger
Well-Known Member
Sounds like fun!
TT5.9mag
Two atmospheres are better than one
Please give us your definition of baseline.
I bet there are more than a few guys here that would like to see your J heads.
TT5.9mag
Two atmospheres are better than one
The speedmaster and the pro max I believe are the same exact head.
junkyardhero
Well-Known Member
i thought it was the same casting but the pro maxx has a proprietary porting program that gives it that exxtra?
either way, i'd like to see them stacked up against each other.
Ironmike
Well-Known Member
Hey why not call Dave at Hughes and see if he'll lend you a set of Big Mouths? If not I'm sure someone has a set of Eddy's with a murdered short side turn.
TT5.9mag
Two atmospheres are better than one
Hey why not call Dave at Hughes and see if he'll lend you a set of Big Mouths? If not I'm sure someone has a set of Eddy's with a murdered short side turn.
I remember your thread.
TT5.9mag
Two atmospheres are better than one
Didnt they have different levels of porting? Like as cast then “shocker” or something like that?
When somebody share's this type of info, no issues whatsoever.
junkyardhero
Well-Known Member
O RLY?
in all seriousness, i don't have the slightest idea. i've only taken a cursory look at their wares.
TT5.9mag
Two atmospheres are better than one
Not the 2 in the pink 1 in the stink kind of shocker.
Shocker 185 Mopar CNC (Sold in Pairs) - PROMAXX Performance Products
This kind of shocker.
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