i am currently building my 1973 l-82 vette i built the bottom end of the motor here are the specs i need advice please somebody help me! i want to run a procharger maybe a weiand supercharger but im pulling towards a vortech, procharger.

350 bored 60 over
forged speed pro internals
.495 lift cam
9.5-1 compression

i'm stopped right now im tryin to do research on this setup and apparantly not a lot of people do it
should i run a supercharger or good ol turbo(s)
i want to stay with the forced induction set up

any advice would be nice thank you

 

With 9.5 to 1 comp and a small cam you can't run much boost. You will detonate the pistons right out of the holes.

 

I love my twin turbo's but there is alot to setting them up.Do you want to fit it all under the hood?If you are wanting something to bolt on and go,a super charger or blower might be the way.There will be tuning and setup with any of them,and they all have that place where they shine so it kind of depends on what you want for your vette.They all have the wow factor!

 

im all about the look and sound but wanna go fast (everybody does right lol) i would love to paint my car gloss black with the polished blower stickin out the hood the car is going to be my weekend warrior... my dad said that the biggest disadvantage of the blower is the motor back firing and that belt coming off and motor be done. is there any truth to that? (by the way im 20 years old im still learning lol)

 

if i do decide the weiang street supercharger do you think the motor could handle it? what kind of heads should i get?

 

No offense here but you have a tremendous amount to learn about motors in general. To start off with a blower or turbo is not the easiest thing to do. Just bolting on a blower or turbos is not going to work. These have to be planned out and done right. I have seen many a blower car get dusted off the track by a well setup carbed motor. If it is not done right you are wasting your time. You dad has been watching to much drag racing about the blower belt coming off and killing the motor. Yes the nitro cars have this problem on occasion but rarely do gasoline motors and not ones that are running little boost. You have to much compression and the cam is not right at all for a blower. Turbos are a whole different story. My advice is seek some professional help if you are serious about this. You will spend a boat load of cash and have a not so good blower motor if you just start bolting on pieces and it probably will not be very fast.

 

As mentioned above there is lots of research that needs to be done on this subject. With 9.5 cr and aluminum heads you will prob be okay in the 6-8 psi range. To lower compression you could get larger chambered heads. Turbos, Roots, and Centrifugical blowers are all different in their own ways. I would suggest lots of internet or book reading before making a choice.

 

im not even going to (try) think about turbos until i get my hands on an ls1. a sb 350 w/ 8psi of boost(which i believe is the max you can do on a stock 350)is about (i think) the same as a stock ls1 properly tuned for (about, i think) the same price. personally, i'd rather get an ls1 and then have the option of upgrading it in the future for even better performance thats a sb 350 though. im not sure about the max psi on the setup you'll be running, GL either way


now, im only 21 so im still learning too for now, im keepin myself busy with replacing some gaskets on the egnine, restoring/modding exterior/interior in my 79, no time to be wondering how to fit a turbo under the hood.

 

When you say 'forged internals', do you mean you've installed a forged crank, rods, and pistons? I'm assuming this is a factory 4-bolt main?

It sounds like you have pretty decent lift on the cam, but what cam is it?

I thought turbocharged setups were run in the 7:1 range in terms of compression, static, before the induction charge is factored in?

It sounds like you have a decent built bottom end for a reliable 350, although the .060 overbore doesn't make me feel totally comfortable. Make sure your cooling system is sorted out properly if you're running that much overbore.

It appears you have a lot to do on the project aside from the motor. My advice to you, is go with what you've got, but throw on a budget set of heads L-31 Vortecs, with matching intake, a simple carb setup, and get the thing running. Once you're on the road, you'll come up with a long list of things that need addressing.

Then, once the car is sorted out and you run out of projects, save up a budget to go forced induction (which might require a different bottom end setup, whether dishes in the pistons, or otherwise large volume cylinder heads, to get you into the right compression zone). But this way, you won't be left guessing when there's a problem, because the car will be otherwise reliable.

I bought my 69 coupe at the age of 20 as well, and I'm 10 years into the project now, still going strong. But believe me, it took about 6 years to get to the point where I was actually happy and confident with anything I was doing.

This forum is a good resource, and I also recommend www.hotrodders.com for general tech troubleshooting.

Good luck, brother.

the blonde weasel

 

actually... L31's won't work because they can't handle the amount of lift in your cam.

just pick a set of budget cast iron heads that work for your bottom end setup. slap a 600 or 650 cfm carb on there and get it running, then go from there.

cheers

 

put a normally aspirated ZZ454 in it and don't look back...probably cheaper in the long run and more dependable too........jmho.......

 

I have run a blower for over 20 years and i run a weiand street blower,you need to buy a blower carb and forged pistons and good flowing heads,heres a pic of new engine going in and a old pic.
















engine will fit under hood without air filter,but i would not run like that,the hilborn scoop works really good ,forces cold air down the engine and runs unbelieveable .I also have 9 to1.people that have never had forced induction dont know the awsome power they put out ,excitement everytime you drive the car.i have had my engine built 4 times over the years with more hp everytime,and when i went to a blower that was it,i will always have all my vehicles supercharged,i have a truck that is supercharged with a paxton novi 2000,with nitrous.Heres a pic of a 177 weiand blower engine that i built for a friend.









forgive me for the ford,sorry guys,its a sweet truck.

 

research is key, a mentor might help too. joining a local corvette club may help widen the knowledge base you can pull from.

best turbo book ive read is Maximum Boost by Corky Bell. as far as tuning, after getting everything installed correctly, rent a dolly from u-haul and tow it to the nearest dyno shop. Im eyeing up a twin turbo setup and thats going to be my approach. also, i decided to go with fuel injection to make tuning easier. im prob about to be crucified for saying that, but im 26 and have worked on FI cars my whole life, tried to rebuild my quadrajet and the motor never ran right since (so bad it could barely idle). bought a full TPI setup, some bigger injectors (for my 383) and how she runs relatively well. just sayin that carbs apparently arent my forte. but thats just my opinion/direction/setup. best of luck to you. when you get to buyin parts, post some pics of the build!

 

no offence here but my blower is just as dependable as any naturally asperated engine,and i will run circles around your zz454.

 

I have the small 144 supercharger. It was easy to set up. use good gas, get the timing curve correct, set fuel pressure and try NOT to blow it, screaming 7000+RPMS. After a few runs, you can change pulley dia. to suit your needs (faster or tamer)

 

I agree with the dependability part. I had a 2000 mustang running a vortech at 10psi (meth injected cooling). It made it to 160,000 miles on that setup as a DD with very little problems before I sold it. FI can be just as reliable as a NA as long as you set everything up properly and dont exceed what the motor can handle in terms of boost.

I see a blower in this car's future as well.. only because it has the cheap mexican 4 bolt goodwrench block in it pushing a whopping 7.8:1 ratio as it sits right now..

 

This is true to an extent,but the truth is that boost is boost and it can happen with any of them.It's not good to back fire let alone under boost.(will not wipe the motor out usually,but can dammage it,depending on the boost level.)There are timing issues that will need to be addressed on a boosted motor.Btms,controlers, tuning,ect, can get expensive quick.
However,It is not rocket science but needs to be researched and understood before diving in.There are advantages and disadvantages to each one of them,so a lot of research goes a long way on the discision process.

 

i really appreciate all the advice guys beings i already have the motor built the way it is im just going to finish the motor out and put 150 wet kit there paint it gloss black and put ccw's (maybe) lol on it i have an s10 that i been tinkering with i guess ill make that my racing vehicle again thanks for all the advice and my dad doesnt really know much about chevrolets as it is (mopar man) he believes that if it dont have a 440 or 426 in it it aint fast... which i cant argue with him lol