Debating on cam selection for this motor 70 SS Tremec 5spd 4.10 gear ....street car only wrinkle is the stock iron RECT port heads with the low 8.5cr .want good street perf so need some torque here are my choices in Roller and flat tappet not sure of budget yet so want to suggest one of each

Hydraulic FT Voodoo #202 219/227 @.050 112 530/542 ......... my pick
#203 227/233 @.050 110 524/554

Hyd Roller Voodoo #211 221/229 @.050 112 575/575 ...... my pick
#212 231/239 @.050 110 600/600

I would go with 203 or 212 if it had oval port heads or 9.5cr but not sure how much rect heads will kill the torque

Opinions Pls

A ton with no cylinder pressure,at least the Tremec/4.10s give some mechanical advantage. I'd go with the 212, advanced 6 degrees. Heck, maybe even on a 108lsa if he doesnt mind the terrible lope.

Gene ......hoped you would chime in .. good idea on 108 cl the cam should be advanced 4* but your saying another 2* is that right ......I agree the 212 is a great street cam but with that cr and rect heads advancing it another 2* and a 108 cl will compensate........remember he does not want to use headers how much will that effect the bigger cams ??

With stock rectangles I would advise a minimum of a 10 degree split. Something around 227/239.

I think Gene is reffering to 6* for a 110LSA to get 104ICL. JMHO, regardless of what LSA you get I would install the cam at 104-106* ICL, no later. I run 10.4/1 CR w/ hyd roller 112LSA set in at 108ICL. Prior, I ran a 230/242 hyd roller 113LSA, set at 108ICL w/ 9.5/1 CR. Both worked great. Personally, I think you need to disregard the small cams and step to the upper 220's-230 on the intake side and not worry about it. The Crane 286 Powermax would be very docile in that motor, yet work well. It specs at 286/296, 226/234, .537/.551 112LSA. Comes ground at 110ICL. Install this w/ another 4* to set it at 106ICL. I ran this is a 9.5/1 408" motor w/ ported ovals and 2.19/1.72 valve combo at 110ICL. Overall it ran good, but to do it again, I would have installed it advanced. Don't overlook a small solid falt tappet. Seat timing is greatly reduced with a solid. You could run mid 230's @ .050 with a solid, set in at 104 and build some decent cylinder pressure.

The 60212 is a very nice cam in terms of good idle and vacuum. Pulls to 6000+ w/no float that I can tell. Low-end is excellent even with my 3.31's (going to 3.90's). Idles at 700-750rpms and 11-12" of vacuum. Just watch out for P/V clearance, but probably will be OK.

I'd think the combination of a low compression ratio and rectangular port heads would make for a very lazy engine down low right where you want some torque. I'd be more concerned about raising the comprression ratio if I was determined to use those heads, that then provides many more options for cam selection.

Unfortunately the engine combo is the way it is ........freshly redone and just waiting for the best cam possible with exhaust manifolds ........I know the the 212 cam works very well with 9.5 cr and headers etc but what I'm looking for is the right way to go with 8.5 and rect heads .....if you really think the 203 and or 212 will be Ok withthis combo fine but Ithink smaller or as Gene says advance the cam even mopre and grind on narrow LSA .......dumb combo I agree but it is what it is ....... EDDY 100 cc heads with these pistonns for a 9.5 and the 212 would be perfect

For comparison, my 454HO which had ~8.75, rec heads, and a small 211/230 511/540 roller cam made just over 425HP and 500+ftlbs of torque. That along w/my 3.31 gear and 28" tire was supposed to be a dog. But, she ran real good and had the MPH for mid 12's. Torque monster it was.

So dont let those rec heads scare ya.

For comparison, my 454HO which had ~8.75, rec heads, and a small 211/230 511/540 roller cam made just over 425HP and 500+ftlbs of torque. That along w/my 3.31 gear and 28" tire was supposed to be a dog. But, she ran real good and had the MPH for mid 12's. Torque monster it was.

So dont let those rec heads scare ya.

OK so with above small cam it worked well ......... this is not same combo cr and heads you now have the 212 in correct ? and you do have headers
Di you change the cam and cr all at same time or do you have sopme experience withtis cam with low CR

No current combo changed big time -see sig.

But when my motor was in 454HO mode, I discussed w/UD Harold which cam to stick in, the 211 or 212. He said the 211 would be better b/c of the lack of gear I had. The 212 really needed at leat 9.5, preferrably 10.1+.

Oddly enough, the 212 idles has about the same idle quality as did my 454HO cam - very mild IMO.

Your best bet would be to speak with him, he's got some new stuff which should work even better.

How about a custom 270 Mega type SOLID lifter cam from Isky like say, 270/280, 108/108, and whatever lift Ron comes up with??

Sucker should, imho, unless I am missing something do very well.

pdq67

If Mr. Brookshire said 211, then 211. BUT I'd really consider a custom one on 110/108 LSA. As Harold explained, the tighter centerline helps intake ram effect, as does advancing the heck out of it. WATCH PV clearance if he goes tighter than 110 esp on the ex side, which I would do actually. Custom 211, 108 LSA, installed on a 103 ICL.

Hope he dont want to rev this puppy much. It wont make power over 6000, maybe even 5700 rpm.

But it'll feel great going throught he gears on the street.

BTW, you can do it with a hyd flat tappet as well. .570 lift aint much.

In fact, I was trying to find the master Comp lobe catalog, fitting a 231/242@.050 lobe together, and look at this..

http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=11-600-8&Category_Code=Thumpr

So I;m thinking a 5444/5208 lobe combination , XE series, IN:226@050", .546"/ EX 236@.050" .556" on a 108 LSA. Go ahead and grind 4 into it. Give it 4-6.


In a solid the 6054 IN/ 6056 EX would be a dandy arse camshaft/


Joe, whatyya think?

Here's the reference

http://www.compcams.com/Technical/Catalogs/LC2007/2007LobeCatalog.pdf