hey guys, I am still very indecisive regarding my cam selection for my 383 TPI(not built yet). My camaro has a '88 corvette L-98 with the factory aluminum heads, 700r4 tranny(B&M), 9-bolt(3:27)rear, probably going with a 2500 stall converter, headers(no cats), 3"flowmaster exhaust. The stroker kit I purchased comes with a eagle cast crank, eagle rods, kieth brown pistons, clevite rings, mogul bearings. I will be retaining the factory intake tpi set-up for now. The cam in question is the compcam cs-290hr-12(hyd roller) duration @.050lift 230/244, lift.510/.540, 112*lobe separation. Is this good for a street/strip application+daily summer driving? Please let me know of any other cams that might be better. Thanks!!

 

That durations a little high, the rest looks good

You'll need to do some serious prom tuning, even on a 383.


If you're going stock TPI, you certainly can't USE high duration, cuz bottom line you WONT rev, not only is it increadibly restrictive, but your stroker will create more friction and rotational resistance at any RPM's than the 350.

I recommend duration at .050 to be somewhere in teh 224/230 range on your 383 if you plan on upping your intake soon.

 

I think the #'s look good for a 383...may want to check with Crane on idle vac, etc...but the extra cubes should support it.

I'd hold off on the converter until after the engine is spec'ed out.

Seriously think about doing something with the intake though..big cubes and a cam that want's high RPMs, isn't going to work well with the stock setup (IMO).

 

Also, I might mention you may need to rethink the engine combo...you'll most likely have to put some money into the current heads to handle the new cam specs...but will they be up to the 383's requirements without getting in and hogging them out? No use building a stroker, in my opinion, unless you're going after some decent power..the '70's and 80's were filled with big-cubed engines with no HP

 

Check the sig....

This is a Comp 264 and it has some lope to it, it runs great...

Running a Hypertech chip for the 350...

 

Desktop Dyno says it'll make 378HP and 397 TQ at 5000 RPM. Looks pretty good! A single plan manifold and 750CFM carb would make 400 HP at 5000 RPM and 420 pounds of TQ.

p.s. this is why I went with a carb.

 

well throw a different cam in there and im sure he could see the 20/20 pick up .....

no need for carbs

 

What in the Hell is 20/20 pick up?

 

In my opinion, a good choice in cam would be the LPE #74219
219/219 .525/.525 112lsa. This is one of the most versatile cams out there for a TPI. The specs may seem tame but a friend of mine went 11.55@121 with that cam in his Vette with a 383 and MR. Go into my web sight and look at "BadBowties".
www.geocities.com/dzperf

 

Desktop Dyno is WAY LOW on the torque values for TPI. On both the engines in my car, it made the right horsepower DD2000 said, but the torque values it said were what I got at the rear wheels! My ZZ4 cam engine it said 325 HP and 385 TQ. I made 280 HP and 380 TQ at the wheels! And now with this LT4 HOT cam engine, it said 380 HP and 420 TQ. I actually made 320 HP and 420 TQ at the wheels. So dont think you're making 20 ft/lbs more with a carb engine over a TPI just because DD said so... And I'm not so sure on the HP figures either.

As for the original combo, I agree the cam you've listed is too big for what you want... The GMPP LT4 HOT cam would be a good choice for the L98 heads and stock TPI. Also the LPE219 cam. If you want a little more, GMPP also makes a 224/230 cam. I cant remember its part number but its listed in their catalog. If you want to use a 230/244 cam, I would very highly recommend some other intake such as a MiniRam, LT1 intake, or the new Holley Stealth Ram.

 

I agree wih HiTech5, LPE 219. I have it and like it a lot. I've seen many mid 11 sec.-low 12 sec. N/A Vettes with this cam. Here are some more combos to look at:

http://temp.corvetteforum.net/c4/bea...enSetups.shtml