Hey guys. I have a 350 with a Miniram, AFR 195 Eliminator Heads, Hooker 1 3/4" Longtube Headers, 1.6 Roller Rockers, 58 MM Power Products Throttle Body, MSD 6AL2 igntion box, D.U.I. distributor, Corsa true dual 2.5" exhaust with h pipe, and some other small miscellaneous modifications. I also have 3.75s in the rear.

This is a 1985 Corvette.

My current camshaft is TPiS' flat tappet version of the ZZ409 roller cam.

Again this is a FLAT TAPPET camshaft.

The specs of this camshaft are 224*/224*duration @ 0.050", 0.528"/0.528" valve lift with 1.6 roller rockers, and 112* LSA.

I only bring this car up to 6000 RPM MAX.

I personally don't think that the car has as much power as it should. I haven't dynoed it yet.

So this brings me to my next question. Is this a mismatched combination? Is the Miniram shining right as the cam is falling off?

Thanks.

 

the miniram is high RPM intake.. since you stop revving the car at 6000 RPM the cam is about right for making what you want of it but some more cam like 230* to 240* duration @ 0.050" with .550 lift, revving to 6,500 RPM would make much more use of the intake, heads and cam.. but overall i wouldnt call your combo mismatched. a miniram is basically a LT1 intake made for the gen I small block. LT1's came with a much smaller cam and head combo then your Vette has now. if you had a Camaro or Firebird i would of suggested a Holley Stealth Ram because you'd gain a little bit of torque and not lose maybe even gain a horsepower or two.

 

you're biggest issue is flat tappet cam..... so that .550 lift i said to get might be hard to find.... not sure a flat tappet can ramp .550 lift in 240*

 

Did TPIS burn your chip? Tune is the first thing I would look at. Cam looks fine to me. Btw, make sure you run zinc additive in your oil. They took it out of the shelf oil since everthing is roller now. Epa thing. Cams will wipe themselves out in a couple thousand miles, flat tappet that is. Take care.

 

Agree with the others here. Cam isnt bad for what you are targeting but heads and intake will support more rpm. I prefer rollers so you can get valve lift area without adding a lot of duration

 

What are you running for total timing? I have a pretty lengthy history with this intake and based on my experience, i've found significant power by adding ignition timing up to 38 degrees total. On my 383, I went from 12.10 to 11.70 by advancing from 32 degrees to 38 degrees. I ran same total timing on my 406. I also like a dual pattern and tighter lobe separation.

 

I have somewhat similar setup. 358, zz409 but I have roller cam and a supper ram with some mild port work ( fastburn heads) and a stick. I run to 6500 without issue. Not tuned yet and biggest issue is traction. It "feals" real strong. No Dyno numbers yet either though.
Oh yea, still on a 305 prom.

 

Nothing wrong with the combo. Just get a good tune and spin it up to 6300. That's a normal TPIS combo.

 

38°?? Wow.... what heads were you running? I always thought the total timing was a function of hte combustion chamber efficiency, as opposed to the intake manifold design.

AFR's dyno sheets on their website shows they're running 34° (which is actually what I'm running with my 180's).

 

Iam running a flat tappet cam an I use Shell 10 w 30 rotella t oil with zinc in it an run a bottle of Lucus break in oil additive all the time just remember to take the inner springs out for break in . Then drain oil an put fresh you will be good to go.

 

With his heads and exhaust there is no need to run a longer exhaust duration, single would probably make more power and depending when the exhaust valve opened and closed better mileage and less of a gassy smell. The intake unless it's heat soaked wouldn't dictate spark advance. Advance is decided more by chamber design, head material, quench, compression ratio and piston design.

 

If you don't want to go past 6K ththen 224 is high enough. My old 355.with a hot cam and HSR didn't make peak power untill 5900rpm or there about. Look into a roller cam conversion and get the same cam duration and lsa with more lift and you will make more power.