6-71 supercharger
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
6-71 supercharger
I have a '75 C3 that's being rebuilt at the moment and I also have a bullet proof Dart 400 engine with 6-71 supercharger that will be going in it. Have any of you guys done this conversion already, if so could I ask what problems you encountered with it. I want to try and get it right as I go along
Thanks for your help, Nick
Thanks for your help, Nick
Burning Brakes
Joined: Jan 2007
Posts: 1,057
Likes: 4
From: Concord Calif
I have a '75 C3 that's being rebuilt at the moment and I also have a bullet proof Dart 400 engine with 6-71 supercharger that will be going in it. Have any of you guys done this conversion already, if so could I ask what problems you encountered with it. I want to try and get it right as I go along Thanks for your help, Nick
Thanks for your help, NickSounds like a fun car but "Bullet Proof"
Melting Slicks
Joined: Dec 2003
Posts: 2,487
Likes: 1
From: Sydney
If the engine is 'bullet proof' (I assume it has forged crank, rods, and pistons with a suitable compression ratio for the boost?) and fed by a 6/71 blower then the rest of your drivetrain is going to suffer......What trans are you running and has the rear-end been beefed up?
In terms of actually installing the thing you are going to need a big hole cut in the hood and a good cooling system, other than that it should drop right in.
In terms of actually installing the thing you are going to need a big hole cut in the hood and a good cooling system, other than that it should drop right in.
Last edited by cosmicvette; Apr 24, 2009 at 11:23 AM.
Safety Car
Joined: Aug 2006
Posts: 4,102
Likes: 1
From: Forsyth Illinois
This is a new computer,and don't know where the pics are,but had a 74 w/383,671,dual 600 eddys,and nitrous,TCI,and 9".The problem was cooling the engine,and running the plumbing for the stock radiator to mount up to the intake plate to flow the cooling.Besides that.....it was scary fast!
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
Thanks guys, the engine has forged crank, rods, pistons, roller rockers, Dart HP ally heads 8.0-1 Cr, 6-71 with twin holley 600s and is being bench tested as we speak. I'm expecting around 500bhp to 550bhp.The Gearbox (TH400) has been uprated to 800bhp. Torque converter?...havent got a clue which one to use... any advice? As for the rest, well that's where I need your help too. I've been told the diff can take 600, but I'm not convinced. I know the axle shafts are a weak spot as are the prop(drive) shaft and UJs. Thanks for the advice about radiator/heating, I had a feeling that was going to be another headache area. The car is being built for street use only.
Thanks Nick
Thanks Nick
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
This is a new computer,and don't know where the pics are,but had a 74 w/383,671,dual 600 eddys,and nitrous,TCI,and 9".The problem was cooling the engine,and running the plumbing for the stock radiator to mount up to the intake plate to flow the cooling.Besides that.....it was scary fast!
"Scary Fast"Cheers Nick
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
I cant speak for Manuel, but some of us have just seen too many good parts break to think that anything is bulletproof.
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
Something usually goes eventually.
Cheers Nick
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
Street use! bad news
Your open to more problems than you could imagine. Sounds great and good bragging rights at cruise nights but street use would be a joke. A substantial blower drive with a minimum 2 inch belts with water pump, water hoses, charging system parts {alternator with belts to drive it}. Where can you attach all the necessary parts required for street use...It would be apart more that together....
Your open to more problems than you could imagine. Sounds great and good bragging rights at cruise nights but street use would be a joke. A substantial blower drive with a minimum 2 inch belts with water pump, water hoses, charging system parts {alternator with belts to drive it}. Where can you attach all the necessary parts required for street use...It would be apart more that together....
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
Street use! bad news
Your open to more problems than you could imagine. Sounds great and good bragging rights at cruise nights but street use would be a joke. A substantial blower drive with a minimum 2 inch belts with water pump, water hoses, charging system parts {alternator with belts to drive it}. Where can you attach all the necessary parts required for street use...It would be apart more that together....
Your open to more problems than you could imagine. Sounds great and good bragging rights at cruise nights but street use would be a joke. A substantial blower drive with a minimum 2 inch belts with water pump, water hoses, charging system parts {alternator with belts to drive it}. Where can you attach all the necessary parts required for street use...It would be apart more that together....
Hi, thanks. I can see where you're coming from, it will be a challenge to get it all in. That said I have fitted similar setups to much smaller UK cars before. The blower drive doesn't actually affect the position of the water pump, or even the alternator in some cases.P/S pump may be a problem. There are many 'blown' street vettes around....at least 3 here in the UK to my knowledge and I'm guessing a whole lot more of them in the USA. As the guys are saying, it's the other stuff that's the main problem, ie rads, drive chain etc., which is why I was asking for their help and advice. Provided the engine is properly built to handle power outputs & modifications etc and provided it is set up properly, there is no reason for it to be 'apart' more than any other
. Blowers can be fitted to standard non modified engines with suitable compression quite sucessfully and reliably without the need for even 4-bolt mains, forged crank, rods pistons etc
. I'm not quite sure what you mean when you say street use would be a joke, so I can't reply to that point. Blowers are docile until they start providing boost which is when you floor the pedal, so normal driving shouldn't be a problem. Visibility could be though. Thanks Nick
Melting Slicks
Joined: Dec 2003
Posts: 2,487
Likes: 1
From: Sydney
I have seen plenty of people on here with 6/71's setup and still running their accessories (although most people serious enough to have a 6/71 don't usually have A/C anymore, but plenty with the stock water, alt and ps setup.
If you have thermo fans installed on a C3 (instead of the big original fan and shroud there is a MASSIVE amount of room in front of the motor) the only problem I have seen in a couple of installs is that people have had to take a notch out of the crossmember and weld in a patch plate to give enough clearance to the crank mounted blower pulley.
A 6/71 can be 'streetable', but my question is what gears are you running in your rear-end? With the good ole TH400 and a drag racing set of gears a blown car is going to suck down the gas, that would probably be the biggest concern on the street (or more precisely on the highway).
If you have thermo fans installed on a C3 (instead of the big original fan and shroud there is a MASSIVE amount of room in front of the motor) the only problem I have seen in a couple of installs is that people have had to take a notch out of the crossmember and weld in a patch plate to give enough clearance to the crank mounted blower pulley.
A 6/71 can be 'streetable', but my question is what gears are you running in your rear-end? With the good ole TH400 and a drag racing set of gears a blown car is going to suck down the gas, that would probably be the biggest concern on the street (or more precisely on the highway).
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
I have seen plenty of people on here with 6/71's setup and still running their accessories (although most people serious enough to have a 6/71 don't usually have A/C anymore, but plenty with the stock water, alt and ps setup.
If you have thermo fans installed on a C3 (instead of the big original fan and shroud there is a MASSIVE amount of room in front of the motor) the only problem I have seen in a couple of installs is that people have had to take a notch out of the crossmember and weld in a patch plate to give enough clearance to the crank mounted blower pulley.
A 6/71 can be 'streetable', but my question is what gears are you running in your rear-end? With the good ole TH400 and a drag racing set of gears a blown car is going to suck down the gas, that would probably be the biggest concern on the street (or more precisely on the highway).
If you have thermo fans installed on a C3 (instead of the big original fan and shroud there is a MASSIVE amount of room in front of the motor) the only problem I have seen in a couple of installs is that people have had to take a notch out of the crossmember and weld in a patch plate to give enough clearance to the crank mounted blower pulley.
A 6/71 can be 'streetable', but my question is what gears are you running in your rear-end? With the good ole TH400 and a drag racing set of gears a blown car is going to suck down the gas, that would probably be the biggest concern on the street (or more precisely on the highway).
. A/C won't be going back, or at least I'm not planning on putting it back, and plans are for 2 electric fans with manual overide. Rear gears are 4.11 at the moment although I open to suggestions on that one. The car will only be used at w/e and meets, so not overly concerned with the MPG, which I guess will be in low single figuresFuel economy wasn't part of my build criteria!
Thanks, Nick
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
I have a '75 C3 that's being rebuilt at the moment and I also have a bullet proof Dart 400 engine with 6-71 supercharger that will be going in it. Have any of you guys done this conversion already, if so could I ask what problems you encountered with it. I want to try and get it right as I go along Thanks for your help, Nick
Thanks for your help, Nick
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
Hi marshrat99, Many thanks. If you haven't bought a 'Blower' yet it might be worthwhile looking at the new types. They are a lot more efficient and much more compact than mine. Some have manifolds suitable to use with 'Vortec' heads too. If like me you want the retro look of the mighty 6-71 then go for it. The engine doesn't have to be high performance either. you can go with a stock one provided the compression is low enough. Engine is being Dyno'd at the mo. Can send you the spec n photo if wanted. Cheers Nick
Last edited by 58impala; Apr 25, 2009 at 08:57 AM.
Thread Starter
Advanced
Joined: Mar 2009
Posts: 72
Likes: 0
Melting Slicks
Joined: Jul 2006
Posts: 2,373
Likes: 6
From: Baltimore MD
One main thing that you will not like with a 671 is that it will be hard to see when you drive,the blower sticks up pretty high and abstrucks most all your view.I went with the smaller street blower ,weiand,because of the this problem,heres a pic of my engine,i will be putting it in today.
Im hoping to get 600 hp,You dont need a big blower to get good hp numbers,but the bigger ones will produce bigger numbers .I also have nos setup too,havent decided on it yet.
Im hoping to get 600 hp,You dont need a big blower to get good hp numbers,but the bigger ones will produce bigger numbers .I also have nos setup too,havent decided on it yet.
Last edited by Billysvette; Apr 25, 2009 at 09:46 AM.
Melting Slicks
Joined: Dec 2003
Posts: 2,487
Likes: 1
From: Sydney
One main thing that you will not like with a 671 is that it will be hard to see when you drive,the blower sticks up pretty high and obstructs most all your view.I went with the smaller street blower ,weiand,because of the this problem,here's a pic of my engine,i will be putting it in today.
I'm hoping to get 600 hp,You don't need a big blower to get good hp numbers,but the bigger ones will produce bigger numbers .I also have nos setup too,haven't decided on it yet.
I'm hoping to get 600 hp,You don't need a big blower to get good hp numbers,but the bigger ones will produce bigger numbers .I also have nos setup too,haven't decided on it yet.
Please let us know what the difference is like, were you just running the standard engine before this one?
