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-   -   camshaft help...434sbc (https://www.racingjunk.com/forums/showthread.php?t=22347)

flight71 11-24-2008 08:19 PM

camshaft help...434sbc
 
I'm in need of some advise on my selection of a cam for a engine i'm working on for a camero here's the specs it is a 10.6to 1 engine with alluminum dart pro 1 heads with 64cc chambes with 215 runners and 1.6 rocker ratio, eagle 4" crank, eagle 6" rods, victor jr short intake with a 850 willys mech secondaries, i am looking for info on a roller cam and this will be going in a 85 iroc camero 3.73 rear and will have a auto tranny with a stall converter, thanks for any and all help

jmarksdragster 11-24-2008 08:46 PM

How heavy is the car? How fast do you expect the car to go? Do you have a converter and if so what stall?

flight71 11-25-2008 02:28 PM

dont know the weight of the car its not gutted just as it came off the assembly line, i dont have a stall converter bought yet but benz this is something i will be driving on the street i would say a 2500-3000 stall and i dont care how fast it will be as i know it will be fast enough to get me in trouble, i basically want as much camshaft in it as possible but still be able to drive it to town and cruise around on the street, i know it doesnt have enough cylinder head on it but its what i had laying around any info greatly appreciated!!

jmarksdragster 11-25-2008 06:49 PM

Here is a Comp Cams hydraulic you can try, but the nice thing is with a 400 it's hard to find a bad cam. It will work well with an 11" converter in the stall range you listed. Your heads are actually a little large for the street, but not excessive. It should easily put you in the mid to low 13 second range depending on your weight.
http://www.competitionproducts.com/p...umber=12-246-3

If your budget will handle a hydraulic roller, this one should get you in the 12 second zone.
http://www.competitionproducts.com/p...er=CCA12-601-8

flight71 11-26-2008 09:03 AM

I was sure hoping to put more camshaft in it than that but thanks for the info

jmarksdragster 11-26-2008 11:39 AM

More cam requires more converter or it will leave like a pig. What are you looking for?

flight71 11-26-2008 03:26 PM

well it will be a solid roller benz i already have lifters laying around but i guess i just thought maybe the big cubes would allow me to get away with more camshaft, i keep referring to this car as a street car but it will only be something i drive to town on occasion so just wanting to take the words "street car" to the limit. I also plan on putting a NOS cheater plate system on it also but will keep it down to a 150 tune up, just looking for a bad ass play toy to drive on the street. I used to have a 78 malibu with a 355 10.1 crower solid lift cam around a .530 lift i believe with a 350 turbo 2500 stall 4.10 rear with a 200 shot on it and i just miss have a street car, man was that thing fun to drive, not a terribly fast car, just real fun to drive and thats what im looking for i just think in the 8 years that have passed since the malibu that some of the race toys i have now might make it harder to find something so mild as the camero a bore so just looking to sqeeze all i can out of this cheap little toy, thanks for any help

jmarksdragster 11-26-2008 05:58 PM

With an 11" try this.
http://www.competitionproducts.com/p...umber=12-771-8

With a 10" 3500 to 4000 stall this one will scare you.
http://www.competitionproducts.com/p...umber=12-900-9

I wouldn't worry about that much stall on a limited street engine, make sure your valve springs will handle the lift.

flight71 11-26-2008 07:27 PM

Now thats more like it! Any advice on a converter i've only used tci and coan and really good luck with both but were all in all out race applications i had an old GER converter in my malibu that someone gave me that worked awesome but didnt know anything about it, thanks for all the info

flight71 11-26-2008 07:29 PM

You being from florida i dont suspose you know steve johnson do you?

jmarksdragster 11-26-2008 10:42 PM

Can't say I know him, TCI or Coan will work, Hughes, ATI, JW, Turbo Action, Neil Chance... I would look for a tight 10", 3500 to 4000 and use the larger if your springs will handle it. Tell the company you chose the combo you are putting together, and that you want it to lock well for street use.

bbadperformance 12-05-2008 08:00 PM

Clearance Issues ?
 
I didn't see any thing on the cam specs but you are aware that with the
434's four inch stroke you have to run a small base circle cam shaft,
I believe it is a .900" base circle.

Also I'm not sure about the eagle rods but with the Compustar rods in my
434 the largest cam you can run is .660 lift and still have the minimum rod to cam clearance.

zipper06 12-05-2008 10:08 PM

Mark is right on with the .630/.630 cam with 106 L/C, i have one and installed it @ 102 lot's of HP with that cam. In my 434" motor with Lanotti promod rods i have .734 lift with 1.6 rockers, but Bullit ground the base circle to .870 for clearance with the rods. A .660 lift will fit with eagle rods and .900 base circle, from personal experience.

Zip.

jmarksdragster 12-06-2008 02:44 PM

Yes, forgot about the small base circle, my 427 has an .850 base for clearance. But any of the cam companies can put them on a smaller base, you just have to wait for it, usually not a shelf item.

flight71 12-13-2008 10:13 AM

so .660 lift is the max with a .900 base circle cam when using the h beam eagle 3d stroker rods? is this with or without grinding on the rod and bolt for clearance

JEFF69Z28 12-14-2008 08:05 AM

CALL DART AND ASK THEM TO SPEC A CAM FOR YOUR MOTOR.THATS WHAT I DID WITH AFR AND THEY HAD COMP CAMS TO GRIND A CAM FOR MY MOTOR(4340 CRANK,6 INCH H-BEAM RODS,406 CID).
ITS ABOUT 300 DURATION AND 678 LIFT,WONT KNOW THE RESULTS UNTIL THIS SPRING WHEN THE TRACK OPENS.

tylera189 12-17-2008 03:00 PM

what if you had a little bigger cam with a larger lobe sep like 108. Would that help it clear the 4inch rods. I was told it would help. my cam is .679/.645 and I am planning on a 434. it is a .900 base. Also its a 4/7 swap, would that make it harder or easier to clear a 434 rod. And I know you can send a cam back in to be re-ground. So would they change the specs all together, or would they be able to change the base circle to help make it clear, but leave the specs alone??

zipper06 12-17-2008 04:03 PM


Originally Posted by tylera189
what if you had a little bigger cam with a larger lobe sep like 108. Would that help it clear the 4inch rods. I was told it would help. my cam is .679/.645 and I am planning on a 434. it is a .900 base. Also its a 4/7 swap, would that make it harder or easier to clear a 434 rod. And I know you can send a cam back in to be re-ground. So would they change the specs all together, or would they be able to change the base circle to help make it clear, but leave the specs alone??

I have a little bigger spec cam than you are talking about, .689 in fact and will run 1.6 rockers on it, and i had Bullit grind me a 4/7 swap cam, but they ground it to .870 base to be sure the .900 will be close if not hit "H" beam rods. They can go as low as .850 base circle, there is another issue which comes up. You absolutely have to use vertical tie bar lifters with the small base circle cams. The horizonal tie bars will almost alway hit the lifter boss in the valley. In my 434" i have tall seat lifters that will not have this problem, also make sure you get the lifters that are made for small base circle cams. They have more clearance on the side struts where the roller is installed.

All just precautions

Zip.

tylera189 12-17-2008 04:23 PM

ok I have comp lifters vertical bars. all for the .900 setup. I guess It will just be a matter of checking clearance. I suppose I could just build a 421-427 and not nave the issue. I wonder how much e.t. I would loose with a few less cubes?

zipper06 12-17-2008 07:03 PM

Don't know the difference between 421" and 434", but a friend of mine has a 394" in a 55 chev that weighs 2650lbs that can run 5.70 all day long on a toilet bowl with alcohol. I have that car on a vid and posted it a couple months ago in the induction forum.

Zip.

jmarksdragster 12-17-2008 10:22 PM


Originally Posted by tylera189
ok I have comp lifters vertical bars. all for the .900 setup. I guess It will just be a matter of checking clearance. I suppose I could just build a 421-427 and not nave the issue. I wonder how much e.t. I would loose with a few less cubes?

Probably about a tenth depending on the combo, but it will save a bunch of grinding since you have a .900 base cam. Still need to check clearances everywhere.


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