So what do you do with the car after 5 years, put the stock engine and all the other stuff back in it for the next test?

 

no I will keep the new motor in it and just put the stock exaust back on and the air pump and cat. once every 5 years.

 

You are going to try and run a 290 hp 350 with a carb and computer that are configured for a 150 hp 305? Does it need to run or can you just show it to them? I can tell you right now just getting that thing to idle is going to take a carb wizard.

 

Got one my Father He's a gmc master auto tech supervisor for gmc chevrolet Cadillac Buick here in colorado. Has been for the past 46 years. He's gonna use the dwell meter to fine tune it. then read tune it after carb swap hei and super charger. Only gotta do it once every 5 years. Unless you know of a way to do a good power swap but keep the original carb computer and all of the emissions and still pass??

 

he dosent even know of another way to do it unless we rebuild the 305 bore it out and add alot of after market bolt on's. And we're not into rebuilding I want new and guaranteed.

 

guess its different from state to state like another country I thought the pre 96 was federal law ,so they go by what the car had original ,I don't know why you cant just run msd ignition an carb set up for the 350.an have smog control ,I know mine without headers an true duals it ran like crap ,I never heard of a 290hp engine that makes 230hp to the wheels ,make 600 hp to the wheels with a super charger ,so a super charger that makes more hp then the engine ,I have heard of 300hp out of one for an engine that makes 600hp an that's a $7000.00 set up to get 300 hp Quote post # 25

 

with the stock 305 heads that raises my compression to 9 to1 and that alone pushes me over 300 easy. then add the supercharger which can with a great tune push a total of 600 hp.... guess I could run an msd and good carb and just leave the computer in in so they can see it. IDK there's alot of variables in this build. Trial and error but my stock 350 4 bolt main tired as hell with over 180000 miles in my 2500 gmc pushed 594 hp with the weiand 144 supercharger.

 

you reverted back to breaker points ?

Why would you do that? Heck, I haven't seen a set of points in a car in a lonnnggggg time. I tossed my dwell meter a while back

 

if you knew anything about these computer controlled carbs they are fine tuned with a dwell meter.. NO POINTS....

 

WOW there is a bunch of incorrect information being thrown around in this thread. I was a GM master tech in the 80's I have worked on way to many computer controlled carbs.

Points? GM stopped using point across the board in 75 with some Z28's get the famous HEI ignition in 74. This is a 84 so point were gone a decade before this car was built

305 heads may give you better compression but they flow like crap. Besides the last thing you want in a super charged engine is higher compression.

Computer controlled carb can be checked for proper operation with a dwell meter but NOT adjusted. The computer controls the metering rods to add and take away fuel. The only adjustment is in the computer in the program. The system can not be reprogrammed either. They are burned proms (you have to replace the chip). Custom chips used to be available back in the day but it was very pricey process for a custom motor. Un like an aftermarket carb the Rochester Carbs are not designed to be adjustable even before they hooked a computer to them. So a 305 with 140hp would have a different carb then one with 165 hp. Also the computer can only slightly adjust the fuel mixture. It will have NO effect on idle, acceleration pump, choke kick off secondary's opening . The other issue is just plane CFM. The Rochester is simply not big enough to get 300 hp worth of air and fuel through it.

Rear wheel HP is always lower then engine HP. This is because of lost power in the drivetrain. 20% is considered normal. So a 300hp engine would be expected to dyno 240 HP at the wheels with an automatic. 15% is the guess from a manual. I have seen automatics do worse 20% and manuals do better than 15.

Super chargers making more hp then the engine? So you mean the engine hp more then doubles the engines original hp? When a turbo or supercharged engine is built to run on pump gas you build it with low compression and a boost friendly Cam. You also port the heads differently because air speed becomes more important then flow volume. As a general rule a well build turbo\super charged motor will more then double hp every time. Any time you take about turbo/supercharger you need to talk about the boost range. I am going to build a 383 with a roots style blower and I am aiming 5-7 PSI boost with a 6000 RPM max. Now you can talk about realistic engine issues. Example: A modern 6.0 with 7 PSI off a turbo will go 450 hp all day long. At 25 PSI it would be closer to 1200 HP and that is a completely different motor/turbo setup/trans/fuel system/chassis if you want more then one or two dyno pulls.