With my stock cam, i ran 15.11@90mph. I put in an XE256, and I ended up running 15.30's @ 91 all night long. I dont understand it. Its an 83 LG4, Edelbrock headers, 3" all the way back, 3.73 posi, "G" hanger, "DR" rods, and bumped timing. It wasnt spinning at all off the line, and it wasnt pinging. Im at a loss here. Even Comp Cams suggested this cam for my motor, yet it slows it down. I was at least hoping to break into the 14's. Could it really be running out of fuel? Or am I missing something? Please help me out as this is rather embarassing here. Anyone encounter this problem with a 305? Ill take all the help I can get. Thanks in advance.

 

Actually the trap speed is a better indicator of power than is the time. Since you did gain a MPH it shows a slight increase im power. The higher time may be due to different track conditions, increased weight, older more worn tires etc.

Minion

 

The cam is giving U more power but u seem to have lost some torque. Something else is slowing u down Valve springs, restricted intake, stock heads etc. the 305 is not enough Cubic inches to move a heavy 3rd gen. When there's a carb in the picture everything on that motor is small, so that the motor can build some torque & have good throttle response (the tpi helps the torque on the305 greatly)When u change the cam, aftermarket cams usually have higher lift so if u have stock springs with some high miles on them U can have valve float at a lower RPM! Valve float kills power!

 

Yeah, but my car only has 79,000 miles on it. Maybe the secondary metering rods and hanger need to be stepped up a little bit? I just have a strange feeling its not getting enough gas though, either because of the carb or the fuel pump. I mean CHP replaced the pump on their LG4 before and other mods. Id think there has to be a reason for it. Maybe Im just throwing stuff in the air, but im just trying to get ideas. Any 305 owners have this problem with a cam swap?

 

I suspect those 3.73 gears are not helping you at all. You are forced to rev very high rpms with them, and your engine is not made for it. A number of people have noted that they actually lost time in the quarter by going to 3.73s. I'd say 3.42s would work better and probably improve your ET, strange as that may sound.

 

Thats very interesting about the gears. But arent the 3.73's better to make up for the lack of torque of the 305? Everyone told me to expect at lease high 14's from this cam is all. For some reason it still feels like its running out of fuel. Is there any way to check this? Id hate to go out and get 3.42's and have that not be my problem. But wasnt the point of the car to have the motor take more RPM's? im only going through the traps at about 3800, and the cam says its good to 5200.....

 

Is that thing computer controlled? in my TPI after a cam swap I hardly picked up anything up top which I believe is mostly due to the comp not giving me timing and fuel out of the stock TPI's range. I run a SLP chip now, but I threw the stock chip in and ran .7 sec and 5 mph slower(also slower than the car w/o cam, RR, AFPR, siamesed base or SLP chip for that matter) With the stock chip it felt like I hadn't put a single mod on the car even though I added everything mentioned above toa car with only headers on it before.

 

Its so obvious. Intake, intake, and intake I don't care what kind of hi po stock alum. intake that LG4 came with, if you are running a stock intake, those things do NOT respond well to a larger cam, and definitely do not make good top end power. Go with an RPM intake. Its worth 22 dyno proven HP over the performer and DOES fit under the hood, I have one on my firebird and camaro. I remember WAY back when I swapped from my stock style aluminum 4 barrel to a holley DP and an RPM intake, MAN I was in disbelief that intakes actually made that big a difference. 305's are not that bad of a motor, my Gf's easily walks away from my buddies 14.7 GT, and we still have stock heads and block.
Chris

 

Well, the 305 isn't actually deficient in torque! It doesn't have as much as a 350 but they have the same stroke, from which torque is derived. You can make that 305 rev like crazy but you'll need to do some head work to get there, like higher pressure springs to keep your valves from floating at higher rpms. Usually the party is over in the region of 5000 to 5500 rpm, so that ain't where you want to be with 3.73s. 305s are a lot like the tpi engines, in as much as they make their power rather lower than 6000 rpm. That is all I can suggest.

 

I dont believe they make an RPM intake with EGR, do they? I HAVE to keep this baby as legal as possible. That includes CC Q-jet, computer, and stock distributor. Do yall think this intake could be killing me? I guess it could since it was instralled on an engine that made its peak power at around 4000 rpm stock. Makes sense to me. Any other ideas that could make this wee-05 fly? My goal is mid-14's on stock heads and pistons. Is this possible, or am I dreaming?

 

with the larger cam the 3.73 gear would only help more than it would hurt compared to what you had before. it sounds to me like your in need of a bit more stall speed in the converter to start with. maybe a bit more base timing too. it's not falling off at the high end, your losing at the low end which is where your times are down. i'm sure if you check the 1/8 mile times your quite a bit off as well as 60'. i'd say give it a degree or two more timing and pick up a stall converter if you can. the edelbrock intake would help (with e.g.r. for proper function) alot, but the intake isn't the main problem. it may be a good idea to run the valve adjustment again.

 

Get ahold of Five7kid. He's got a hot little 305 that he built over the winter and can probably help you. Your setups are very similar.

Daniel Burk is another pro with the 305 http://www.ws6transam.org/

Between the two of them, you'll be in the 14s in no time

 

Why do you need EGR?? I also live in Az...I don't know for sure about pheonix, but here in Tucson the only thing they look for is the air system, pump, belt, and cat if applicable. They dont even know what the heck an EGR is! I'm pretty sure you coudl get around that. If not at least go with a performer intake. Stock intakes suck and yes they DO make a huge difference. trust me on this. I've built 5-6 small blocks and intake has always been very important in power potential.
chris

 

well, you have to hope that you don't run into the guy inspecting that happens to know what an e.g.r. valve is. the intake is very important, but even the stock one can be made to work. he has other issue's here besides the intake.

 

I don't think the intake is a problem. Richen the secondaries up for sure. Did you do the cam yourself? Is the cam timing corect?

 

Sounds good. You say richen up the secondaries...What would be a good combo as far as rods and hanger? The cam timing is right on the money. I was actually thinking of checking the rocker arms again. My timing is at 13* right now, I dont know if I can give it any more. But let me know about the secondaries, as thats easy and cheap to do. Right now I have a "G" hanger and "DR" rods.

BTW Formula355: I need an EGR valve to pass NOx out here. Its not just a visual. Its a 240 second simulation test that tests acceleration, deceleration and idle. Basically like driving down an actual road. I miss the old days when they just buzz it up to 40 mph on the rollers and let it idle for 10 seconds.

Any suggestions on the carb stuff though??

 

Also, I was just wondering...is this cam supposed to idle rough? I have a Tech1 and I adjusted the IAB and M/C so the dwell and everything is correct. It just seems like it idles way too rough. Is it better to adjust the rocker arms while the engine is off, or while it is running? Which way will bring better results? Sorry for all the questions, but I'm used to Mopars where the rocker arms are shaft mounted and are non-adjustable. But hey, I'm willing to learn.