I have a 69 Camaro its a drag car and just wondering why it doesnt run the way I think it should. Could someone else run desktop on this set up and tell me whether I am correct in thinking so??? Thanks heres the specs...
Dart Iron eagles 215's
205/160's
406ci sbc 11.8:1 CR
400 turbo
4.11 gear
3800 converter
Doug Herbert Solid Roller 244/244 @ .05 .555/.555 lift (285/285 ADV.)
Air Gap Intake
750 Double Pumper
MSD Ignition
28X9-15 SLicks
Car Weight approx 3400 with me in it.
Launching at 3400 and shifting at 6000 rpm
CE SLide-a-Links
adjustable front and rear hooks like a champ.

Car runs....
60 ft. 1.58's
330's 4.78's
1/8 ET 7.50's
MPH 1/8th 88

Does this sound right or should it run better?? thanks!!

Need more gear if all you are running is eigth mile.

The suspension works so good right now I am afraid of spinning since all I have and can fit is a 9 inch tire

Any idea on the DA of your best pass? If its decent air, I'd say the combo is a little soft. Are the heads out of the box? Are you sure the fuel system is up to snuff? As it sits now, you have enough compression to support 600hp with the right port work, cam, and intake. Looks to me like its making around 390ish right now.

the best pass the made was back in April it ran a 7.36, it was really really good air, dont know exactly what it was but it was good it runs 7.50-60's with DA around 3300. heads are out of the box, fuel system is fine, I used to run an electic pump thought I'd try a Holley manual and it actually runs better with it. I just thought it should run better ET's and MPH better than it does.

I also think youre engine is makin at best 390hp, so something isnt right since your mph is low. Whats the fuel and exhaust system? I'd stick a super victor on it and see how it does - after you get it to run like it should.

Fuel system is a Holley 750 Double Pumper, Fuel Pump is a Holley Manual pump with regulator (7psi) Headers Are Hedman 1-5/8 What should this thing run and what should it MPH?

Fuel system is a Holley 750 Double Pumper, Fuel Pump is a Holley Manual pump with regulator (7psi) Headers Are Hedman 1-5/8 What should this thing run and what should it MPH?

I decent air it should go 11.20's@117ish as it sits with the dual plane and small headers and untouched heads. That would put it around 7.1x@95mph 1/8mi.

Could someone else run desktop on this set up and tell me whether I am correct in thinking so???

Theoretically, there is some more left. Like previously posted, have you been running in the heat of summer? Some of the best air will be in the late fall. Also - how long have you had your combo together? Over the course of a season a few seasons ago, I reduced 1/2 second (1/4 mile) off my 11 sec car just by tweaking this/ tweaking that, perfecting my launch and getting good air.

http://www.hotrodink.com/Images/data/546/1ericsz1.jpg

http://www.hotrodink.com/Images/data/546/1ericsz2.jpg

Have you ran at track and set timing and jetting for max mph? There can be a lot of loss with wrong timing and jetting. I second the super victor idea.

Do you have a 1/4 mile track? a lot easier tuning for mph then.
With the super victor do some 1 3/4" headers.

For sure you need more stall as your 60 is a tenth slower than I would expect. I would say a tight 8" at aroung 4700 would work well. Also, you need to turn it harder. My cam is smaller than yours and is hydraulic vs. your solid and I shift at 6400. Try a few different shift points.

A Super Victor will help for sure on the MPH and if you have the correct stall it won't hurt your 60' a bit.

Timing all in early?

Well I see 2 things in your combo that stand out to me. The first is your cam. I didnt think the in/ex ratio was very good in the Iron Eagle heads. Maybe a larger split pattern cam would help your cause. If youre running a legit 11.8:1 you could be running alot more cam for more power all the way around IMO. Maybe somthing in the Low250's/high250's @.050. The second is your intake. The dual plane is not really suited for a 215cc head IMO so swapping to a single plain would help your cause i would think. Wich intake is up to you...

You have enough compression to run more, more, more. More cam (by a different maker), more intake (like a Victor), more carb, like a 830 annular or even a 950HP, and more converter (4200 stall smaller diameter converter)

Are you sure your compression ratio is that high ?? Did you build your motor yourself or are you going by what the "guy" says?? Your down on power a bunch.the gear with a 3 speed trans should be enough.I've run glides with 4.10's and they were enough. 88 mph ??? your 1.58 60' is right on par with 88 mph. Your just down on power. Why.... is the question. I think not enough compresssion. a victor jr intake will also help.

I have a 69 Camaro its a drag car and just wondering why it doesnt run the way I think it should. Could someone else run desktop on this set up and tell me whether I am correct in thinking so??? Thanks heres the specs...
Dart Iron eagles 215's
205/160's
406ci sbc 11.8:1 CR
400 turbo
4.11 gear
3800 converter
Doug Herbert Solid Roller 244/244 @ .05 .555/.555 lift (285/285 ADV.)
Air Gap Intake
750 Double Pumper
MSD Ignition
28X9-15 SLicks
Car Weight approx 3400 with me in it.
Launching at 3400 and shifting at 6000 rpm
CE SLide-a-Links
adjustable front and rear hooks like a champ.

Car runs....
60 ft. 1.58's
330's 4.78's
1/8 ET 7.50's
MPH 1/8th 88

Does this sound right or should it run better?? thanks!!


Sounds like the intake and cam is killing power. If you want to keep rpms about the same, step up to Comp Cams 12-900-9 (288/296 252/258 .630/.630-106) and a Vic Jr. intake. I ran box stock Dart Iron 215cc heads on a 11.0:1 383cid with that cam and intake using th-350, 4.11 gear, 31" tires, 3200 stall, 3300lbs race weight and went 7.30s@94mph 1/8 11.50s@116 1/4. I have since done some head work, went up on the convertor, and dropped the tires to 30" and went 10.80s with the same cam and intake.

Well I see 2 things in your combo that stand out to me. The first is your cam. I didnt think the in/ex ratio was very good in the Iron Eagle heads. Maybe a larger split pattern cam would help your cause. If youre running a legit 11.8:1 you could be running alot more cam for more power all the way around IMO. Maybe somthing in the Low250's/high250's @.050. The second is your intake. The dual plane is not really suited for a 215cc head IMO so swapping to a single plain would help your cause i would think. Wich intake is up to you...

I agree completely. There is likely little to no technology in the Herbert cam...but they are cheap. One of those cheapies cost a buddy his 454 when the roller wheels ate into the cam.
Ditto on the intake. My engine guy who builds lots of small blocks says the super victor is the best right now.
I dunno a lot about those heads, but I bet they could use some work as well.
Ron

The Piston is a Speed Pro .100 Dome Hyerutectic and it says in the catalog with 64cc head its 11.8:1

The Piston is a Speed Pro .100 Dome Hyerutectic and it says in the catalog with 64cc head its 11.8:1


WELL....... without getting into that... you really have no idea what the true compression ratio really is. I've seen catalog compression figures be off as much as 2.0 points !!!! there are many variables to figuring out an engines compression ratio and that just gets you in the ballpark.

whats your cranking compression ???

The Piston is a Speed Pro .100 Dome Hyerutectic and it says in the catalog with 64cc head its 11.8:1


A flat-top yields about 11:1 w/64cc heads so if you have a dome, chances are you have enough compression. Cam and intake change would definitely make the difference.

here is a good comparison for you

we have an 81 camaro
406 sbc
car is 3500 lbs with the driver--street car
4.10 gear
26X10 slick
350 turbo trans
ptc 10" super street converter 4000 stall
gm 041x heads
hydraulic cam
244 @ .050
501 lift
1 5/8 headers
2.5" exhaust with dynomax mufflers
10:1 compression
performer rpm intake
holley 650 dp carb
suspension is set up very good.

car runs 7.50's - 7.60's in the 1/8 mile on pump gas depending on the weather.

My guess you should be in the low 7's!

I agree with the others -- based on the MPH I would say the power is off a bunch. Just need to find where. The combo could be tweeked (intake, headers, etc) to make a little more but it should be making way more as it sits now.

Have you tried a compression test? You should be cranking well over 200 psi with that combo -- I would guess right about 225 psi.

I would check the fuel supply and tuneup. You need good steady pressure, but usually that causes the car to nose over at high RPMs or do something obvious. Could the jetting be dead lean? Like 15:1 ??? That would killa lot of power . . .

Ignition timing could kill a lot of power too -- but probably not unless it was 10-12* retarded or something. Its hard to miss that . . . maybe the mechanical advance is stuck ????

We flowed a set of Iron Eagle 200cc heads a couple years ago and they were way off what was advertised. Did you flow yours? It might not be a bad idea to flow the heads next time they are off. But even if they are off I don't think that would account for 100+ HP

Another thing to look at is the tranny and converter. Could something be broke? I have read that a bad converter sprag will drop the stall RPM down a bunch and kill some ET.

Just a few ideas for you . . . best of luck :)