Just got back from the track for some testing, with much better air and track conditions from two weeks prior. This time the track was Cecil County vs the previous 75/80.

Here's a breakdown of the runs made today.

pass #1 (baseline pass, 2000 rpm launch, 6800 rpm shift, 16 lbs tire pressure)
1.488 60'
4.291 330'
6.680 660'
102.54 mph
8.760 1000'
10.528 1320'
127.25 mph

pass #2 (2000 rpm launch, 7000 rpm shift, 16 lbs tire pressure)
1.489 60'
4.287 330'
6.673 660'
102.68 mph
8.747 1000'
10.511 1320'
127.51 mph

pass #3 (2000 rpm launch, 7300 rpm shift, 18 lbs tire pressure)
1.487 60'
4.295 330'
6.690 660'
102.30 mph
8.775 1000'
10.549 1320'
126.92 mph

pass #4 (2000 rpm launch, 7000 rpm shift, 18 lbs tire pressure)
1.464 60'
4.252 330'
6.638 660'
102.52 mph
8.715 1000'
10.484 1320'
127.09 mph

pass #5 (2000 rpm launch, 7000 rpm shift, 18 lbs tire pressure, added 4" tall air cleaner)
1.485 60'
4.299 330'
6.704 660'
101.77 mph
8.798 1000'
10.580 1320'
126.35 mph

I seriously never thought this poor little misfit bbc would ever come close to running the numbers it does...down right surprised myself with it's performance today. Also very pleased with how well the drag radials are hooking on a 3600 lb car.

Excellent! That`s very impressive and with radials no less!
Job well done.

It's a big block....why are you surprised ?? :D

Great runs !!

Todd,

Is this the setup that you have been running?

Did you change anything over the winter?

Originally posted by 71454Chevelle:
Todd,

Is this the setup that you have been running?

Did you change anything over the winter? Only changes were chassis dyno tuning last fall finding 25 rwhp and adding the vacuum pump setup over the winter which was primarily to help crutch a nagging oil leak issue from too much internal pressure.

Nice, Very impressive!

Originally posted by Motor Martyr:
Nice, Very impressive! Yea, from the lil BSE rat ;) graemlins/thumbsup.gif

What was the DA and Barometer?

What kind of air cleaner did you use on the last pass?

Holy Cow is right! Thats BSE power! :D

Originally posted by Motor Martyr:
What was the DA and Barometer?

What kind of air cleaner did you use on the last pass?

Holy Cow is right! Thats BSE power! :D Don't know the DA, but the temp was 63 degrees, humidity was 35% and the barometer was 29.04. All taken from Cecils weather station printed out on the time slip. I just don't trust my gauges.

What's the DA calculate out to be?

The air cleaner is a 4" high element with a drop base...all that will fit under the hood. It's a Summit air cleaner which is near identical to the K&N. I did not re-jet for the air cleaner, which likely caused the tuneup to go fat.

Todd,

Looks like its about time for a re-match with Ed. :D graemlins/hurray.gif

Nice weather, but you'll see better weather in the fall.

I looked around for some DA calculators, seems they need the actual altitude along with the other info.
The one i found also requires an Altimeter setting (not the same as Barometer).

Have you tried picking up on your starting line RPM?

Originally posted by Motor Martyr:
Nice weather, but you'll see better weather in the fall.

I looked around for some DA calculators, seems they need the actual altitude along with the other info.
The one i found also requires an Altimeter setting (not the same as Barometer).

Have you tried picking up on your starting line RPM? I did try a higher launch rpm on a previous outing, but that was at a different track. At that track (75/80, marginal start line), the car blew the tires off with a 2500 rpm launch. I kinda wish I had tried that today, but simply didn't think about it...was more focused on shift rpm and tire pressure tweaking.

Todd,

That is AWESOME! graemlins/thumbsup.gif

Congratulations on the new bests.

Todd,congrats on your new bests..very impressive graemlins/thumbsup.gif

Looks great graemlins/thumbsup.gif . Wish mine would put up those kind of numbers :D .

Billy

Real Nice Todd - I see you were going up in tire pressure and it seemed to be working too.

BTW, Mark from godragracing.com was on site taking pics. I hope to be able to post a link to his photo gallery which I think he will have up my Monday.

Those BFG's aint too bad graemlins/thumbsup.gif Congrats Todd

Nice work. See what a set of fancy, expensive heads can do?? ;) :D :D

"fancy expensive heads" I thought he was using 781's :confused:

Originally posted by Rapid Robert:
"fancy expensive heads" I thought he was using 781's :confused: Yup, same old '781's with 2.19/1.88 valves, bowl blend, port match and otherwise stock ports ...i.e. no porting :eek: :D

any plans to make a swap back to say Radial slicks and note the difference in ET/60ft?

Must be that cam :D ...I'm going to be ordering it soon graemlins/thumbsup.gif

Originally posted by Motor Martyr:
any plans to make a swap back to say Radial slicks and note the difference in ET/60ft? Nope, can't really. The back end of the car was lowered 2" for the shorter street tire. The taller 30" radial slick would rub inside the top of the quarter panel unless I raised the back of the car up again. Also, I took the 4.56 gears out I was running with the 30" Hoosier radials. The car now has 4.10 gears with the 28" tall BFG's and the finish line rpm's are very similar to the 4.56 gear/30" tire combo. If the car is dead hooking which it is, I doubt the 9 x 30 radial slick would be worth any ET over the BFG's other than possibly the fact that the tire itself is heavier weight wise on the BFG...parasitic rotational loss, but likely minimal in the 60'.

the car probably liked the change in weight bias with the lowered rear height

Originally posted by Rapid Robert:
Must be that cam :D ...I'm going to be ordering it soon graemlins/thumbsup.gif Well, all I can say is that grind worked well for myself as well as Ed.

I did find that my springs weren't up to the task of controlling the heavy bbc valvetrain at 7400 rpm shifts. Anything over 7200 rpm shift and you could lightly hear the car breaking up at the top of the shift. Any more rpm and I'd need to somehow put more spring pressure in. Charlie Booze (Booze Brothers Racing dyno guru) felt that with a 6750 rpm HP peak that a 7500 rpm shift would give the best ET. Just not enough valve spring to get there...7000 shift seemed to work pretty well though.

Originally posted by Motor Martyr:
the car probably liked the change in weight bias with the lowered rear height I'm sure that helped...the back end did sit pretty high with the 30" tall tire.

Every little bit helps....to quote one of my good friends ;)

Will more spring pressure have an effect on how much you street drive the car?

Great times Todd - good job.

MAT

FANTASTIC!!!!! graemlins/thumbsup.gif
Don't even tell me that you were deep staged either smile.gif

Todd,

Just got a couple of quick questions.....

What are the specs of the two different spring sets that you were (are) using?

What size BFG drag radials are you using?

Thanks. smile.gif

Originally posted by 71454Chevelle:
Todd,

Just got a couple of quick questions.....

What are the specs of the two different spring sets that you were (are) using?

What size BFG drag radials are you using?

Thanks. smile.gif Darren, were you asking about the valve springs or the front/rear suspension coil springs?

The drag radials are the 325/50-15 on a 9.5" wide rim.

Jim, No deep stage here...shallow.

Mat, thanks bud.

Now, if I could only build some more torque to get the 60's in the low 1.40's, I'd be real happy graemlins/thumbsup.gif .It's off in the distant future, but I'd think that a set of adjustable shocks just might be the key to dropping the 60's more. The suspensions working real well, but the front shocks are elcheapo Lakewood 90/10's and the rears are Gazan no-name red shocks...neither front or rear shocks are adjustable.

Thanks to all who have left comments here. Many of you may remember how several years ago this car was dead stuck in the 11.30 raneg with the prior 406 sbc. Then the bbc was swapped in and the track performance didn't show any measurable gains.

I find it literally amazing how different the car runs today than it did back then. Not in my woldest dreams did I ever think this missfit/oddball bbc would ever come close to running mid 10's, much less break into the 10.40 range. Back when it ran it's first 10.90 pass, I felt that was all it would ever do...much to my surprise, it just kept picking up ET with little or no major changes...just keep making small tweaks and tuning.

Now I'm sitting here thinking that maybe, just maybe the car could run a low 10.40, or even a high 10.3_ pass in fall cool low D/A air. I guess well all just have to wait and see...assuming it doesn't blow up before that graemlins/clonk.gif .

Originally posted by Rapid Robert:
"fancy expensive heads" I thought he was using 781's :confused: I guess you missed the smilies on the end of my statement. In other words, it was my attempt at some humor. Sorry, you missed it. These are smilies: ;) :D :D

And a BIG thumbsup! graemlins/thumbsup.gif graemlins/thumbsup.gif graemlins/thumbsup.gif

mind blowing performance graemlins/beers.gif

Here's a link to the pics from Saturday. Read through the post and follow the link to the gallery...great collection of photos and cars.

http://forums.godragracing.com/viewtopic.php?t=13455

Sorry Todd, I meant valve springs.

You were talking about valve float in the upper rpms and I was wondering if you were running a spring similar to what Comp recommends and then switched to a stiffer spring. I know that most of the XE roller cams are cast cores (your's is a billet piece , right?) and can't handle alot of pressure but I don't see how such a soft spring can follow the aggressive ramps of their cams?

I have a billet Lunati cam that I may (in the future) have reground to the XR286R specs and was wondering what springs to run. I want to run enough spring to keep the lifter in contact with the cam, but I did not want to have to run battleship springs.

I was just curious to what others with that cam is running for springs.

Bad arse! Glad to see you've exceeded your goals. We'll be waiting for that 10.30 in the winter.

YA know a 150 shot would get ya in the 9.60 range and wouldn't be hard on the motor or the rings.

Originally posted by 1bad67:
Bad arse! Glad to see you've exceeded your goals. We'll be waiting for that 10.30 in the winter.

YA know a 150 shot would get ya in the 9.60 range and wouldn't be hard on the motor or the rings. Here's why I don't think this engine would tolerate any nitrous. The machinist builder had pistons custom built with a high ring land. When they fly cut for the intake valves, they broke into the top ring land and the back side of the top Dykes ring is visible from the top. There's also a narrow sliver of aluminum that would be prone to melt away if the combustion temp got too high from a lean mixture.

http://www.qis.net/~geislert/piston1.jpg

http://www.qis.net/~geislert/piston2.jpg

http://www.qis.net/~geislert/piston3.jpg

OUTSTANDING! Nice job! graemlins/hurray.gif

Ok, bad idea! It would be unforgiving for sure!
Did you run on pump gas! It can't be to misfit to run what its runnin.

Originally posted by 71454Chevelle:
Sorry Todd, I meant valve springs.

You were talking about valve float in the upper rpms and I was wondering if you were running a spring similar to what Comp recommends and then switched to a stiffer spring. I know that most of the XE roller cams are cast cores (your's is a billet piece , right?) and can't handle alot of pressure but I don't see how such a soft spring can follow the aggressive ramps of their cams?

I have a billet Lunati cam that I may (in the future) have reground to the XR286R specs and was wondering what springs to run. I want to run enough spring to keep the lifter in contact with the cam, but I did not want to have to run battleship springs.

I was just curious to what others with that cam is running for springs. I had run the 939 Comp spring, but it was not strong enough (this was several years back). I think the new spring number is a 933 spring. I can't find the original back, but I think that's the part number.

Awesome performance, Todd. Congrats graemlins/thumbsup.gif

A thumb's up from me too!!!!!!!

Is there any other way, short of shortening up your cam or going more cubes to give you the extra T you want to lower your 60' times sense gas seems to be out of the question??

pdq67

Originally posted by pdq67:
A thumb's up from me too!!!!!!!

Is there any other way, short of shortening up your cam or going more cubes to give you the extra T you want to lower your 60' times sense gas seems to be out of the question??

pdq67 The only things I can think of that are easy would be to try a 950HO instead of this 850, and/or using a RPM/Air Gap dual plane intake.

Torque aside, the car could really use a set of adjustable shocks front and rear...that would make the biggest difference in 60' IMO. The suspensions working very well, but could use some way to tweak the shock valving.

For a relatively low dollar approach on shocks look into the Rancho 9000 series.
I believe they are 9 way adjustable now.
We put a set on our 69 Camaro and they helped us get our best to date 1.39 60 ft.
We got ours from the Cal-Track lift bar outfit.

Way to go Todd,

what converter are you running, IIRC, its an ATI, what is the rated stall on it?

Tanx
Bob

Originally posted by Bobalos:
Way to go Todd,

what converter are you running, IIRC, its an ATI, what is the rated stall on it?

Tanx
Bob It's an 8" ATI Treemaster that flashed to 5500-5600 on the chassis dyno last fall. Charlie didn't really rate the stall other than to hope it flashed to approx 4800-5200 rpm. That was before we found some more power which likely raised the flash point slightly.

Cool, thanks. thats a good amount of converter for a street car, but seems just about right for your combo.

thanks again
Bob

Bobalos,
Keep in mind that that is the flash stall speed..
Under dead hook conditions too.

A quality converter will flash failry high but not "feel" so loose on the street.

I'd be willing to bet his footbrake stall speed is less than or right at 3000 rpm..

Right on Jake,

3K is still pretty high if you are cruising it on the Freeway, to get to & from the track/shows etc. not horrible though, I have had worse with worse gears, LOL.

Bob