I've already posted this in the motor swap and engine tech section but to no prevale. I blew the old 305 a couple of weeks ago. I really like the 330hp vortech engine for it's price to power ratio. However, I'd like to put a hydraulic roller cam in here with a little more lift. I realize I will need to have the heads machined for more lift. So any suggestions on a cam that will be computer friendly? How does an LT4 Hot cam sound? I've got a set of 1.6 roller tip rockers and lifters with less than 1,000 miles on them. Any suggestions would be appreciated. Thank you, Roy

 

you can go up to .490 lift without doing any head work, that is about teh size a an XE268 cam. scoggins dickey did soem mild head work and the LT4 hot cam set up and got 420ponies out of it. i think all they did was the spring work, valve job, and mild port on the exhasut side.
even with teh crate motor as delivered you will have to do a chip, so that doesn't really need to be a factor in your cam selection.

later
tim

 

Do you think it's worth it to switch to a hyd roller cam? Or should I just keep it simple and stick with hydraulic? I'd really like to see what my TBI can push out power wise, though I'm pretty sure 420hp is outta reach (it be nice though ) I've also seen the max lift on those vortecs debated......maybe I should stick with the stock cam and install my 1.6 rockers on there. It would put the exhaust lift at .490 though. Any opinions? Thank you

 

I would run the 330 HO as is for a while and get used to chip tuning. It's going to seem like beast till you get used to the new power. The LT4 hot cam would be a nasty cam to start prom tuning with if you don't have any experience in this area. Might be best to take it in steps. If you allready tune chips then dissregard this. If I was planing to have a lift greater then .480 in the future, (the advertized limit for vortec heads) I would have the heads modified now before you install the engine.
Good luke, Dave

 

I measured my max valve lift on my vortecs to be .505 before the spring retainer would hit the valve seals. While my cam with .500 lift toasted the seals in a day and I had to remove the heads and do some machining.

 

the 350HO comes with a roller cam

 

No it doesn't. Accourding to the engine specs, it's a hydraulic cam.

 

I would convert to the roller cam. You can make a lot more power due to steeper ramp rates on the lobes of roller cams without sacrificing low end torque. A nice CC305 cam will make that engine scream but will require head machining and valve springs. If your going to change the cam and modify the heads why not try this engine for $500 less and that would give you the $$ to make the necessary mods and buy the cam.

http://www.chevy-gas-diesel-engines....ngine-249.html

Also, this engine already has a roller cam and thus you won't have to convert which will save you some more $$. Who knows they may even do the head machining and put in the CC305 cam for a little more $$.

 

The CC 305 cam sounds just about perfect, and should keep the computer happy for the most part. Do you think my Holley TBI could handle that much power though? Even If I go with 90pph injectors, I'm afraid 670 cfm won't cut it. I've been toying with the idea of boring out the holley TBI to 52mm if possible, and replacing the blades. Of course I would bore my TBI to carb adapter as well. Theoretically, that should be around 750cfm, as that is the flow for the 52mm TPI throttle body. Anyways, I know you have quite a bit of tuning experiance brian, do you think I could get the pump shot I need say to around 6,000 rpm with that combo? Or should I just go with something a little smaller? I definetely want to go to a hydraulic roller cam for the reasons you mentioned. Like I mentioned before, I have a set of hyd. roller lifters, and anything that can be donated from the 305 like the lifter guides. Thank you, Roy

 

does these blocks come with the holes drilled for the SPIDER that holds the LIFTERS?

that 96-98 chevy engine has the vortec heads correct???

what are the specs on that cc305 cam
are they anything similar to this or the hot cam???
Duration @ .050" 218/228, Lift .492"/.492", Lobe sep. 109'

 

Measure your manifold opening before you get to big. The opening on a square bore manifold is not much wider then the width of a stock bore TBI. I ground some on the side walls before installing my performer RPM in case I went to a 2" in the future. I had to grind at least 1/8" off the sides of the plenum to clear larger blades.

 

The engine I listed already has the spider and everything in it since it has a roller cam in it just like the lowly L03.

The Holley TBI will be sufficient for airflow on a 350. You will sacrifice some peak horse power but if GM can use a 48mm throttle body on the 502HO 525 big block then you should be ok with a 52mm TBI unit on a 350ci motor. You will want the large injectors though, since that combo would make some great horsepower. The LT1 guys are making around the 400hp mark with the CC305 cam and ported LT1 heads which probably have nearly the same flow as stock Vortecs. Stock LT1 aluminum heads don't flow near as well as the Vortecs so you would be a notch up to begin with. So properly tuned you should make 380-400 flywheel hp with that combo. It will definitely take some tuning to get that thing running but it sure would be sweet.