lee33lyn

iTrader: (1)

I'm looking at doing some NASA time trials. I have a 84 Camaro Z and a 83Z with crossfire injection. the 83 is for parts. The rule book says i can swap parts from year to year as long as its from the same model and as long as they are OEM. My question is the CFI car has a 175hp motor in it and the most powerful stock 305 was in 85 iroc. What do I need to do to make the 175 a 215 hp motor? Is it in the came or in the heads or in the comp or all the above?
thanks Leebo

Fast355

iTrader: (2)

Your CFI 305 should have flattop pistons, HO spec cam, and most likely 416 or 601 heads. If so, that is the same exact combination used in the 215 HP LB9 TPI engine. To get to 215 HP, you need the TPI/Exhaust manifolds and exhuast, Inductions settup, and electric fan to replace your mechanical. The easiest thing for you to do now to get extra power, is single cat TPI 350 exhaust manifolds and Y-pipe, high flow aftermarket cat (if allowed), 350 TPI cat-back exhaust, clean up the ports in the intake manifold (if allowed), and cut-down the swirl vanes in the lid. You can make a CFI setup flow plenty of air for your needs. You can also switch the regulator assmebly to run the a single bypass style regulator with the TBIs plumbed parralel instead of the currenty, awkward series arrangement. This allows you to run normal TBI truck injectors. After doing this, your moded crossfire would respond well to 350 TBI injectors.

lee33lyn

iTrader: (1)

I was planning on using the carb off of the 84 and I looking for a LG4 or L69 aluminum intake. Would I still use the exhaust combo you suggest? Do you see any problems with my plan?The CFI engine won't stay running, something to do with the CFI so I thought I'd rebuild the motor and put it in the 84.Ditch the CFI.

Fast355

iTrader: (2)

THe carb/intake would work well, but make sure the carb is calibrated for the HO engine. I would run DR rods on like a F-hanger (stock setup on my 1983 G20 Vans 305). The exhaust would still be applicable, the manifolds have a much larger internal area and a larger exit, the Y-pipe is much less restricted than the stock LG4/Crossfire piece. The carbed HO never reached more than 190 HP IIRC. If the 84 carb is computer controlled, you will need to transfer the computer setup from the 84.

Atilla the Fun

Just how lenient are they with the rules? is this a race-only car, or will it be street driven?
For race-only, and liberal with the rules, the best intake would be from a '70-'71 Z28. Old design, but still more flow. And if you can do that, you may as well build you a '70 Z/28-spec LT-1, which is not the same as a '92-'97 LT1. Though that would be a great Z28 engine as well, as would an LS1, though that doesn't look remotely like a SBC. If you're stuck with third-gen, then the top offering of all was the 245 HP 350 in the '91-'92 Z28.
Going to a 350 should be easy, even for street-legal AND race legal. Then you have the chance to use an '87-up block, and the LT4 cam and 1.6:1 rockers. Unlike the '70 cam, this one would pass an emissions test, and build way more low-rpm torque, while still pulling hard up top.
If you're stuck 305, still find a later block and do the LT4 cam.

lee33lyn

iTrader: (1)

In my class the car has to be street legal. No emissions on my car for an 84 in NC.The motor has to a camaro but I'm not sure I can go to a 350. Still researching.All the parts have to be OEM.I have a 71 350 4bolt main and some pretty good heads and I'll use that if I can.Do you know if I can bolt all the 305 stuff onto it?The car needs to look stock?

Atilla the Fun

Bolting 305 stuff to a 350 is easy. The only difference in the blocks is the bore diameter. Why don't you just post a link to the rules?