need a cam for a 496 BBC in a heavy car

[olds48]

What have ya'll used in the past with good success?
The car is 2990 lbs without driver
1/8 mile only
Canfield heads
11.2:1 comp
Th400
33" tire with a 5.14 gear
Its setup with a solid roller now
Naturally aspirated,of course
I've been 6.62 with the car and it think it may go a little faster as is,but my 60' sucks.Best 60' of 1.44.

Any opinions welcome! Thanks

[bbchevy]

What have ya'll used in the past with good success?
The car is 2990 lbs without driver
1/8 mile only
Canfield heads
11.2:1 comp
Th400
33" tire with a 5.14 gear
Its setup with a solid roller now
Naturally aspirated,of course
I've been 6.62 with the car and it think it may go a little faster as is,but my 60' sucks.Best 60' of 1.44.

Any opinions welcome! Thanks

2990 is Heavy?Man I'm @ 3035.
My Cars got a 496,but i'm @ 14.5 1
Dart 355CNC
C/Cams CCA11-736-9
Glide 4.70 gear 10.5x33,8"PTC 6300 Stall
Best pass-5.601~124, 60' 1.22-.24

You Deffinately have ALOT more Lauch RATIO than me,which should Help you?

Other than the Compression,would like to know what Head you have?Along with stall,Intake and Carb or INJ.,Gas or alcohol?The more Info the BETTER,...?
I have a couple Rollers left here,think I have a 748-748?
But I will look into a cam for you w/the 11.2 Static comp?

Later
G 8)

[zipper06]

468" i built for my friend. Car weighs 3700 lbs without driver. Driver weighs a little over 200 lbs.

BB 2 Extra heads ported
turbo 400
1050 Dom.
4.56 gear
15X33X15 GY's

No fiberglass except hood and trunk, all roll up windows

It runs 6.38 @ 109 mph on motor with 1.44 60'
Runs 6.18 @ 114 mph 1.38 60' with 200 shot of nitrous
9.77 @ 138,5 in qtr with 200 shot nitrous.
Cam installed at 106*

It has a stock GM steel crank and 804 rods with good bolts and and forged Probe 10.4 pistons, roller top end. i used a small cam because of the weight of the car.
I'm not kidding it totally surprised me on the performance :oops:

Zip.

http://img.photobucket.com/albums/v515/zipper2/468big-blkcamheavycar.jpg

http://img.photobucket.com/albums/v515/zipper2/Ronnies66Biscyne001.jpg

[TheYellaBrick]

I never get tired of seeing that big black 'n' flamed boat in that wheels up attitude !

[olds48]

That makes me wanna put my 496 in my '66!

At a track full of Fox bodies I'm considered a heavy car

See,all you guys are running way faster than me,I dont know why my car is a slug. Our track is a true 660 feet long and I turn 103-107mph when i have it detuned to run the 6.95 index. All out the best mph it has turned is 112 so I know it is making good top end,just wont leave hard.

My heads are the bigger of the two Canfields, I think it is a 335 runner???
2.25 and 1.88 valves
NO port work whatsoever
I shift a 6200 ( i know...) and it runs fine on pump gas. I went ahead and ran on VP 110 last season and saw no difference. I'm gonna return to pump gas just for cost reasons this season. My converter is not real loose. In high gear I can stall it on the foot brake to about 55-6000. At the line it will only foot brake to about 3000 max before pushing thru the brakes. With a 1600 rpm launch (approx. i dont run any staging controls) it will flash to about 4000.

Anymore info needed? Thanks for the help so far.

You guys are making me jealous.If at all possible,I would love to be able to run the 5.95 index naturally aspirated,but I think I will need to bump my compression to make that a reality

[zipper06]

The car has a Trans brake and a 5500 stall converter. It sounds like your converter may be a little loose, if you can stall it to 6,000 rpm. (JMO) We shift at 6600.
We go to the shell station and fill up the tow vehicle and the racecar, it's never seen race gas. As a matter of fact it has mufflers also, but are loosened and shifted to one side at the track. This car can be driven to Sonic, or anywhwere in our small town, with the mufflers connected. There's a 10 gal fuel tank in the trunk, 2 seats and harnesses. It doesn't load up on the gas or overheat on the street and idles at about 900 rpm. Like i have said before i don't know how much HP it's making, but it's got to be close to 700 i would think.

Zip.

[olds48]

I run thru an air filter and mufflers. Of course my "mufflers" are 4" bullets. If you can call those mufflers. It only stalls that high in high gear,I wish it was a tad looser. It really starts pulling at about 5000 rpm. I think my motor is over-cammed for the compression it has. I'll get my cam specs up when I find them. The lift is in the high 700" range and the duration is really probably too much for my comp ratio. Aah,the joys of buying other peoples take outs :D Its a lunati cam. pretty sure the part # is 50210. But Ill find out and get back.

[bbchevy]

I run thru an air filter and mufflers. Of course my "mufflers" are 4" bullets. If you can call those mufflers. It only stalls that high in high gear,I wish it was a tad looser. It really starts pulling at about 5000 rpm. I think my motor is over-cammed for the compression it has. I'll get my cam specs up when I find them. The lift is in the high 700" range and the duration is really probably too much for my comp ratio. Aah,the joys of buying other peoples take outs :D Its a lunati cam. pretty sure the part # is 50210. But Ill find out and get back.

You NEVER have Posted what INTAKE and carb you have?
Wow,Way tooo much BumpStick!!!
320/334
766/744
110 LS
108
Power band on the Cam,45-8200.
You NEED 6000 min.Stall.But with that Duration,it will NEVER Happen!
Your just Barely touching the Power when you Shift!
Need to Shift @ 7500.You would Be surprised,how it will Pull above 6500 to 8000!
Change the Stick,and get the Converter to PTC and have the Boys LOOSEN it up!!

Later
G 8)

[zipper06]

I agree with G/Greg, way too much cam. I did forget to mention that we launch @ 4600, and have cheapie headers, either 1 7/8" or 2" i've forgot now. I think we paid $190.00 for the headers with muffler flanges and 3 1/2" collectors. O'h by the way PTC is the best in my opinion (sheeh!! :oops: also a person friend for yrs. and yrs.) and the only converter i and most of my friends run. I also forgot to mention the car runs low 10.30's@129 on motor only.

Greg, i'm not so sure i would loosen the converter up with that heavy of a car. It should have plenty of torque if he goes to a smaller cam JMO

I did have the car listed on RJ for $18,000.00, running. I had a person PM me and said he would like too buy the car but don't believe what you say. I told him send me a $500.00 deposit and bring the rest of $17,500 in cash with you. We'll go to the track and if it doesn't run that i'll give you back your deposit and split your gas cost for the trip. Patented saying (bobr) K'O'ed first round. Never heard from him again.


Zip.

[olds48]

Oops,sorry! It is a 1150 Dominator on a Professional Products intake. Everything is portmatched to a Felpro 1275 ( I think thats the one). I DID do alot of clean up work inside the intake due to HEAVY casting flash,but the runner seem to have a nice shape/flow to them. The previous cam I had was a Comp Magnum

Previous cam: http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=497&sb=2

Your specs on my current cam are correct. I knew it was waaaay too big but it got for a song ($80?) and I did pick up two tenths with it. I have tried shifting as high as 7200 and saw no improvement at all. I believe the heads are tapped out at that point. They flow,out of the box, only 375 cfm at max and they peter out above 650 lift. The extra lift probably hurt me. The improvement I did see was probably a result of the extra duration. That Magnum cam had a real lazy lobe due to being a "street roller" as it is advertised. With the magnum can the car never 60'-ed better than a 1.650 :oops: but would pull like mad on the topend.

Another bit of info to throw in the mix. Like I said before,it has a manual vb th400. Twice I have accidentally left in 2nd gear. 60 foot,et and mph were all unaffected by this. Too much gear? Need a 'Glide? Just putting it out there.

Thanks for the advice so far.I will say one thing...this cam sounds sooo good!It surprised me it will idle at 1,000 rpms,sorta,but it sound healthy! I'm wondering if I should re-cam or if I should repiston with...what would you say...14:1? Or do you think I am at a lack of airflow thru the heads for my current cam?

[olds48]

Oh,my headers. They were a set of old corvette side pipe style headers,modified into over the rail headers for my car. 2 1/8 primaries with a 4" collector,4" bullets and then two foot of 4" pipe in to a turn out.TWIMC

http://farm8.staticflickr.com/7202/6945771371_6c964ee53e.jpg (http://www.flickr.com/photos/74366205@N06/6945771371/)
0406092344a (http://www.flickr.com/photos/74366205@N06/6945771371/) by Shiny Ribs (http://www.flickr.com/people/74366205@N06/), on Flickr

[roadkill2]

468" i built for my friend. Car weighs 3700 lbs without driver. Driver weighs a little over 200 lbs.



http://img.photobucket.com/albums/v515/zipper2/Ronnies66Biscyne001.jpg

Nice whale! Awesome! Them ole Biscaddodles sure look good on two wheels . .

[zipper06]

Thanks roadkill2, the car does get some attention because no one expects it to run that good.

Olds, I think it cuts both ways, the cam you're now running would definately like more compression, but i also think with the 5.14 gear you're not using the torque the 496" has. i'm not familiar with the Canfield heads, but i know that the Dart 308's steel heads will make 850 HP, and they flow 360/365 as cast, with compression and almost identical cam that you have. Either way it cost about the same to go to a PG, it will cost you about $1200.00, to go to 14.1 pistons, Probe or Icon's will cost you about $600.00, plus rebalancing the rotating assy, and dropping the gear to 4.56 or 4.30. I know what i would do. I would opt. to the higher compression and different gear. I don't think a PG would pick up more than .015/.020 in the 1/8. I would also put a transbrake valve body in the 400 trans. Course i wouldn't have the money to do either. SS sucks :oops:

JMO

Zip.

[markdunlap]

You can get by with a Lunati .722"/.722" 276/284 110 cam with that compression.

[olds48]

Okay. Thank you Mark.

Zipper,I ran 4.56 gears this past season because I put a plate on the car with the idea of spraying my way to the 5.95 index. It ended up that I never touched the button. Those 4.56's took my 60' from 1.42-1.45 down to a 1.6-1.65. Of course,I'm pulling timing out on every pass trying to run the 6.95 index,but it still killed my short time. I'm thinking that the slow 60' couldnt be helping my reactions time either. Takes soooo long for the car to move!

I really prefer running on foot brake,but its hard to be competitive when 90% of the field runs t-brakes. EVERY round I lost last season was due to getting treed. And the biggest margin was 0.0300 sec. , so Im right there on them. Hoping going back to the 5.14s will help jump off the line a bit faster.

And I know what you mean about affording stuff. Man,if I break anything I'll be out for the season. I'm tapped. But hey...it's a Chevy...it ain't gonna break! :shock:

[markdunlap]

I was taking timing out to to keep over 6.40 with my home built 496.

I used a timer on my delay box hooked up to a msd retard box and took out 10 degrees after my shift point for 3 seconds and then went back to full timing. It left good and finished good. Almost sounded like a shot of nitrous when it came back to life at the end.

Also had a TOO big duration cam in it to slow it down. 284/292 duration @ .050" lift.

And the 1.75" restrictor plate under the 1050 carbie. At 3200#

[olds48]

I have a Mallory Hyfire box that pulls timing automatically when the nitrous is activated. I just disabled the solenoids and type in the amount of timing i want to be pulled. As soon as the throttle switch makes it pulls the timing out and im good. Adjusting the timing is as easy as pushing the buttons on the boxes keypad. I love that box. I think I will redo my setup where the timing retard is activated as soon as i shift out of 1st gear,to help retain all my power for the launch. Im trying to improve my 60',leaving with lazy timing definitely wont help :lol:

[markdunlap]

If you can shift by time instead of RPM, you may be more consistant.

[olds48]

I agree,but I like to drive. I dont want a transbrake or an automatic shifter. Not to take away from the guys who use them,thats all good,I just like to drive. I'll lose before I go with a fully automatic car.Its just me. I enjoy the challenge.

[Pwmax]

Dynoed a 496 last weak, Canfield 310's, Ported victor, 1050 AEd carb, Howards roller, 268-276, .765-.722. 10.5:1, pump gas, made 790hp at 7100, 646tq at 5200. Heads are obviously worked pretty well.

This engine was a 460, that I had built for the guy years before, that he wanted freshened and turned into a 496. The 460 made 745 and 600 ft/lbs with the same cam. made it a 496, just new, same everything else.

car ran 10.20's at 3800+ pounds, stock suspensin, 70 chevelle, drag radials and exhaust. Take the exhaust off, put some slicks on it, and it would have gone 9's easy. It should go in the 9's now in street trim.

With a point of compression, and a vaccum pump, it would have made 820.

Frank