I looked up your vette ''very nice by the way" and saw you are installing a supercharger. Im doing the same thing to my 69 454 vette.
I am currently talking to RBS superchargers about a 871 setup but they cant answer all my questions and I hope you can help. Is your blower a 671 or 871. I see you have a wide belt, did you have to move the radiator for clearance. I also see in pics that were posted that all 671 blowers for vettes have the short blower drive snout.
These are the questions I ask when talking to RBS but they dont know and the supercharger kits they sell are not a exact fit for all cars so I must order the snout and stuff I need to make this work on my vette.
Thanks : Tom
ANY one else with pics and knowledge here PLEASE chime in !!!

 

Well you called out the right guy for answers on that.
I'm sure he will chime in soon

 

I actually bought the 871 blower in 1999 and have been running it ever since. Yes I seem to have all the bugs worked out.
Yes is it a 8-71, yes I run the wide 3 inch belt, NO you do not move the rad, it clears but I do run electric fans instead of a stock one, no room for the stock fan. As for the snout I run a short one. WHY?? The blower comes with a accessory pulley that is ment to run BEhind the blower pulley but this pulls the accessories back tight against the block. Since that means they need to be pushed of to the side, above the valve cover, meaning long accessory belts and more chance of jumping belts.
I machined another pulley that goes in FRONT of the blower pulley, it fits inside the blower pulley allowing the 3 inch blower pulley to run almost against the front of the harmonic balance, a short snout on the blower and lots of room for the accesories down low and easy to build custom mounts.
I will post a pictures.
Any more Questions??
I do run special blower carbs, they are different then normal holley carbs.

 

 

If you want brute horsepower on the street this is the way to go. Absolutely no lag, boosts or 12 pounds are instantanous right of idle, gas mileage is great, actually easy to install and tune, good starting and people just move over when you come up the street. I am use to the slight visiblity problem but on the open road it doesn't interfer.
The worst case is right hand turns, there is a blind spot, not driving down the road , the passengers side of the road is visible from about 20 feet on out but right turns have their blind spot.
I get an honest 15 mpg, never ever load plugs or have overheating problems. It runs right around 185 -190 but I do NOT run a thermostat., I found it made a big difference in operating temperature.
I do run alot of timing, 43 degrees but I have a timing computer to pull 1 1/2 degree per pound of boost out of the motor. I also run LEAN 15-1 but my carbs run power valve with NO spring and the power valves are referenced off the INTAKE , not under the carbs so they blow off as soon as boost starts and give me 13-1 antime the boost is over zero
The vacuum under the carbs are about 20 inches so vacuum accessories work better then stock.
Don't hesitate to ask quesitons.
Good luck

 

That looks pretty damn nice!!

I am sure it is a thrill to drive as well

Chris B

 

good pic's

 

Thanks so much, I like the pulley setup, can any machine shop make up the assessory pulley. When i order do I tell them that I want a short drive snout or do I need measurements. Do I need a special distributor to clear the 871. You running a special crankshaft or just steel. compression ratio. I have a paxton supercharger on my 65 mustang
(0h soorry guys) and I run a Hyd roller cam with 112 degrees but it just dont bite like I think it should, should I go with a 110 degree with this 871.
I was told by Summit racing that a 871 is to big for steet driving and cruising because the blower will get to hot. They recommend a 671.
I think there wrong because I will have to spin the 671 blower faster to get boost , what do you think.
Thanks : Tom

 

I guess Norvalwilhelm takes the weekends off

 

He said to ask ?s.
maybe he's out bining the tires off

 

Sorry guys. I totally forgot about this post and never noticed it. I spend my weekends riding. I have a beautiful arabian gelding Strider and we start each moring with a long ride.

Any machine shop could make the pulley. I have made a couple of them and it isn't hard. I just feel it is a superior way to mount the accessories but you must be handly.
As for short of long drive mine came with a spacer that you were suppose to add to make it long, I just left the spacer out.
The difference between a 871 and 671 is 1 inch in length. As the blower size increase from one number to the next the case length increases this inch .
A bigger blower running slower is always better then a small blower running faster. While I run a 8-71 I now wish I had a 10-71. The height doesn't change.
I run a mallory unilite with the small cap and I have lots and lots of room but again I run a big block.
compression? I run 8 -1. It is better to run low compression and add alot of boost then to run higher compression and low boost.
Running the way I do I can put up to 12 psi of boost and that makes for snappy off the line performance without pushing the motor. Light throttle application produces high boost with little rpm.
Keep the compression in the 8 to 1 range.
Blowers like the 112 lobe centers to build compression and keep the boost from blowing out the exhuast vavle.
Cams are not as important with blowers as it is with natural aspirated.
Hope this covers it. Sorry for the delay

 

Thank you norvalwilhelm. What size fuel line you running. will the stock vette line do.

 

I went right away to a 1/2 inch stainless line and twin electric pumps. I never messed around with the stock setup. I hate mechanical pumps.