<BLOCKQUOTE>quote:</font><HR> The cam swap is something I'm considering once I eliminate the next choke point in my air flow -- the stock exhaust manifolds.<HR></BLOCKQUOTE>
I remember reading an exchange on the stock manifolds; one person said that the L99 manifolds were the same (identical) as the LT1 manifolds, while someone else said they were different.
I will add that IF they are the same, that you won't lose much flow by keeping them (at least for now) becauase they aren't that bad (the stock LT1 makes approx 280 fwhp and 350+ fw ftlbs torque with only aftermarket mufflers and a CAI) and you engine needs less big-air breathing than the LT1 due to the smaller displacement.
I'd suggest the cheap approach first: get a takeoff stock N10 dual exhaust from any LT1 sedan 94-96 and install it with aftermarket mufflers, and using the LT1 dual cats and downpipes.
<BLOCKQUOTE>quote:</font><HR> Geez, from what I've read here and about, adding headers is quite an ordeal, more or less, depending upon what brand you get. My problems would be the same as those with LT1s. One thing's for sure though, I'm getting the ceramic coating.<HR></BLOCKQUOTE>
I agree with what you said - but I still advocate using an LT1 factory dual setup with aftermarket mufflers for now. It's cheap, it's a complete bolt-on stem-to-stern with factory parts. It may provide you with plenty of exhaust breathing that you don't need the expensive aftermarket coated headers.
I'll also add one more thing. Several years ago there was some discussion on the NAISSO digest about people on the east coast that had modded their intake manifold by adding extra interior volume to the plenum (that part that is directly under the home plate). The reason for this was to enhance cylinder filling, by reducing the sharp turns in the manifold that the air has to travel within, as well as to provide a better straight-shot into each manifold runner.
Those manifold mods are exactly what you would want to do to an L99 engine, because they will help boost engine torque. Finally, get onto any GM Perf Parts website (Scoggin Dickey is one) and look carefully at the pictures of the GMPP 350 Ramjet crate motor. Look closely at the intake manifold. It looks just like an L99/LT1/LT4 intake except that it is raised up with a larger volume inside it. That motor makes 400+ ftlbs using a camshaft that is milder than any of the F/Ycars LT1 or LT4 cams, as well as 350 hp.
If you know anyone handy with welding aluminum, that would be my suggestion -- to increase the volume of the plenum in the intake manifold, by making it taller. It will still fit under the hood (because you've removed the home plate) and it leaves the lower part of the manifold ALONE.
<BLOCKQUOTE>quote:</font><HR> I'd mentioned the LT4 Hot cam to someone more knowledgeable than myself, and he countered with the ZZ3 idea.<HR></BLOCKQUOTE>
If I were you, I'd choose an F/Y LT1 or LT4 (non HOT) stock type cam; but if you really want more power at the expense of part-throttle low-speed torque, then the ZZ3 is a better choice than the LT4 HOT cam.
<BLOCKQUOTE>quote:</font><HR>..... Oh, and the 1.6 rockers. I know the Crane Gold rockers work with our cars, but what about anything else? Anybody use those light Crower rockers?<HR></BLOCKQUOTE>
There are many people using roller-tip rockers, as well as full rollers, in bth 1.5 and 1.6 ratio. There are also 1.6 stamped steel self-aligning replacement rockers made by Sealed Power/Federal Mogul (the OEM rocker supplier to GM). Scoggin Dickey has the set of 16 listed at $65 using pn R1023R. The roller tip and full roller rockers have less friction but in terms of power you won't see much difference among them over the stamped ones until you are above 4000+ rpm.
<BLOCKQUOTE>quote:</font><HR> After the cam, the head work will begin. Maybe I'll do both at the same time, if I can scunge a pair of L99 heads to work on in the meantime. ..... Anybody know any good sources for porting info? Books, online, anything?<HR></BLOCKQUOTE>
The Chev Cylinder head porting book by David Vizard. The exact title escapes me, but the author's name is correct. It's around $16, and your best bet.
Post a new thread on the engine perf section, to get a discussion of the intake manifold going. A neighbor of mine has one on his car now, but he hasn't tested it properly on the track yet. He says he can feel a difference but he/I both know that people won't believe SOTP until they see it in a timeslip.
Getting a set of L99 heads to port is a great idea. - Ken