[RR67GTO]

OK, now I hope that I didn't just spend 5k + on an engine that gets a best of about 285 HP. Now when I could have bought a Cheeby box engine with 330 HP for what, 2k?? Tell me it ain't so Joe !! These numbers are not what I was thinking his engine would do. Considering it's pretty close to what I'm almost done building. < Mike >

[shaker455]

RR67GTO,

Those are not your numbers...there for runningbwdog.

I'll do you engine today.

[runningbwdog]

Shaker455,
Thanks for doing a desktop dyno on my engine combination. I have a couple of questions.
Is this rearwheel hp? I'm a little surprised because the factory rating for this engine before I had it rebuilt was 360hp. Of course, that is at the flywheel with no accessories. The new standard gives lower numbers.
Would RAM Air style exhaust manifolds and 2.5" exhaust pipes up the hp and torque numbers.
Thanks again,
Mike

[shaker455]

Mike,
The numbers are at the flywheel or back of the engine not at the rear wheels.

I used HP mainfolds and exhaust on your set up to get those numbers.

What's holding you back is your funky valve size and you could use headers...

Jeff

[shaker455]

RR67GTO,

Here's your dyno numbers:

I could not remember how many cc's 6x-4's are ( some where between 91-96 cc's) but I used 9.5:1 for a CR and I used small tube open headers, first is with the XE-268 then XE-274.

Flywheel hp & tq

Hp 367@ 4000
Tq 507@ 3500

Hp 399@ 5000
Tq 509@ 3500

[RR67GTO]

Thank you very much for the numbers. It looks like the 274 would be worth the extra time. And, if I had the heads ported and done well it should put me in the 400 HP range which is not bad for an old guy like myself.

I'm also happy now that I decided to have the valves changed to 211 x 177 because I'd be looking at doing a complete new set of heads after learning more that I knew back then. Again, thank you very much. < Mike in Oregon >

[shaker455]

No problem Mike

Here's 6X ported w/XE268 then XE274

Hp 406@4500
Tq 529@3500

Hp 437@5000
Tq 528@4000

[455earlybird]

Shaker455
I wonder if you could run the numbers on the 455 I am now building for my 67 firebird
Balanced stock rotating assembly
211/177 heads that flow @ 265/215 @ .500 lift
SRP pistons approx. 9.5/1 comp.
Comp hydraulic roller ground to 230/236
1.5 full roller rockers
Edlebrock Performer RPM
Speed Demon 850cfm annular carb
Have not got headers yet but will be 1.75 4 tube type with either 2.5" or perferably 3" x-pipe exhaust any recomendations on headers for a first gen bird?

[RR67GTO]

That's a nice set up and I really like the flow of the heads. HAve you decided just where your going to keep this beast yet? I tried using a RPM intake under the hood of my 350 car after I had the first engine swapped for a warmed over 67 400. I learned how to put a dent in the hood from the inside out. And then, one of the good people here told me how to use a couple of empty toilet papper rolls. BY placing one inside the other and sticking them over the air cleaned bolt (without the cleaner attached) when I closed the hood the two rolls would collaps on inside the other and when I opened the hood I could look at the rolls and see how much room I had. It was, far less that I would have thought. And because the RPM intake is a bit taller than the normal one A drop down air cleaner did the trick. But, that also meant having to use a manual choke. No problem, because soon I tired of the 400 in that light car and had a desire for an even bigger engine. That's why I first decided to build the 455. However, I came across a beautiful clean rust free Southern California Le Mans, and I changed my plans for the engines new home. I still own and drive the Bird, and ya know what? In the seven uears I've owned that white 68 Bord it's to only car that I have new or old that has never failed to start. And, get me there and back home again. I've collected so many emblyms and other small things for it since owning it I have a shelf ful of them. I'm a true first gen bird man and also own a high optioned 68 400 vert that's just getting done with a real frame off resto after having a real good frame on in 1997. Also decided to use much more of the nice aftermarket goodies on it this time around so it drives as nice as it looks. By the way, on the white 350 (now 400) white bird I own. I toook a set of 69 rear side marker Bird lights and mounted them in each of the front grills as front parking lights. It looks real cool, and before doing it with a set of decent grill inserts I tried it using a set of bad ones I had. Now, it not only has lights, it also has Firebird eyes, as my youngest Daughter calls them. And why they don't make some decent turn/driving light lenses for the 68 I don't understand. Parts are still a bit hard to get, and decent after market fenders are zilch. I tried two of them before going back to having a factory one cut and patched. Anyway, I would like to know how the car deals with the new engine when you install it. I have a new rear I had built for the 455 going in the Bird but it's never been nounted because the engine didn't go in. 71 Nova with welded tubes, new Eaton and NOS 3.23:1 gears built by a locla shop that does nothing else and has been in the same place for over forty years. Good day, and best wishes to all. < Mike from Oregon >

[455earlybird]

I'm keeping it under a 400 hood with a drop base and 3" filter but would like to do ram air setup may have to get a tall 400 hood need somone with experience with this stuff (ram air). Also really need to know what headers are best I have been looking at Doug's headers. Also are there any resonable aluminum radiators out there.

[loren]

Hi shaker455 I have always wounderd how much hp & tq mine would show on the desk top dyno I have a 400 with fully ported heads xe274h cam 9.5.1 comp, rpm intake, headers, carb set up by the carb shop , dist set up by larry row. that is if you don't mind. Thanks alot Loren

[RR67GTO]

Yeahhhh, that's more what I'm looking for. So now, I know what I need to get there. Sure I can run the engine as is and see how I like it. But, the season is over here for a while. Oe reason is I need to replace all that dired out S.Cali weather strip on the car because we get a lot of rain here. So, I can go for the few upgrades, have the heads ported and install the new cam. And, get the car ready for the spring by doing the weather seal and doing some upgrades with having the posi built (I already have everything ready to go) and replace the worn parts below the paint job. Thank you very much for taking the time to run the numbers for me. Good day friend and also the rest of you. And, of course your families as well. < Mike in Oregon >

[shaker455]

Happy T day to you all!

455earlybird and macho t/a,

I'll be glad to run some number for you guys!

455early,

I need all of your flow numbers...not just there peak..also I need all the specs for your comp roller or give me the number and I'll look it up on there site.

What is your bore size and what heads are you running?


Loren,

I need more info from you as well,

Bore size, head #, head flow numbers,carb size,

thanks
Jeff

[loren]

hey, here is your flow chart

wedge intake valve flow chart

port No : 2

valve dia : 2.110

gross valve area : 3.497

stem dia : 0.341

gross stem area : 0.091

net valve area : 3.405

first intake flowscale value : 150.0

leakage% : 0.0%

test pressure : 28

(L/D) ratio 0.05 0.10 0.15 0.20 0.25 0.30 0.35

valve lift 0.105 0.211 0.316 0.422 0.527 0.633 0.739

test flowscale 150.0 298.0 298.0 298.0 298.0 298.0 298.0

flowscale adj. 149.6 297.1 297.1 297.1 297.1 297.1 297.1

flowmeter 0.840 0.580 0.740 0.860 0.890 0.900 0.900

total flow cfm 125.6 172.3 219.9 255.5 264.4 267.4 267.4

leakage cfm 0.0

test cfm 125.63 172.33 219.87 255.53 264.44 267.472 267.42

test cfm/in 36.89 50.61 64.57 75.04 77.66 78.53 78.53

potential cfm 22.76 45.68 68.61 78.65 84.00 87.51 87.51

% flow rating 162.1% 110.8% 94.1% 95.4% 92.4% 89.7%89.7%

This is the Correct Exhaust Valve Flow Chart

port no : 3

vlave dia : 1.770

gross valve area : 2.461

stem dia : 0.341

gross stem area : 0.091

net vlave area : 2.369

first exhaust flowscale value : 158.0

leakage% : 0.0%

test pressure : 28

(L/D) ratio 0.05 0.10 0.15 0.20 0.25 0.30 0.35

valve lift 0.089 0.177 0.266 0.354 0.443 0.531 0.620

test flowscale 158.0 158.0 318.0 318.0 318.0 318.0 318.0

flowscale adj. 158.4 158.4 318.8 318.8 318.8 318.8 318.8

flowmeter 0.410 0.750 0.510 0.590 0.670 0.700 0.740

total flow cfm 64.9 118.8 162.6 188.1 213.6 223.1 235.9

leakage cfm 0.0

test cfm 64.94 118.78 162.57 188.07 213.57 223.13 235.88

test cfm/in 27.41 50.14 68.62 79.83 90.14 94.18 99.56

potential cfm 22.76 45.68 68.61 91.87 97.89 100.57 100.57

% flow rating 120.4% 109.8% 100.0% 86.4% 92.1% 93.6% 99.0%

the carb is a 750 cfm q jet the heads are 6x-4 I now this more than you need just making sure I give you the right info Thanks Loren

[loren]

also I have 1.65 rockers thanks Loren

[shaker455]

Loren,
Sorry my friend wrong info!

I need yourflow #'s per .100" lift...here's an example:

Intake lift flow
.100" 86
.200" 155
.300" 200

Every # you can give me for intake and exhaust ..

[loren]

I'm lost All I know is whats on that flow sheet I'm not to good at all this stuff yetI will have to get some help to find this out.

[loren]

all i was told was they flowed 267 at 600 lift when I bought them. sorry wish I knew.

[shaker455]

Don't bother,
I'm just going to have to print off your info and decode it for a loss of proper words...LOL

But I see some of the numbers I need there just not in the right order and it look like they did not use a standard lift number like .100"-.150-.200 etc

looks like they went .105-.211 etc and it look like the total cfm list is your flow....ripping my hair out now!...LOL..I'll get it for you

[shaker455]

I need you bore?

.030 over? head #? carb size?