Thread: Thinkin' about blowin my 350, yae or nae?

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Just wanted to get some feedback if I should blow my 350? It's strictly street, but I want that added beef. I've been looking at a Weiand 671, any good? One of the questions I have is what is the difference in the 1/2" or 8mm pitch? Are there any pro's or con's to each? Also, what other mods, if any, need to be made to accomodate one of the Weiand kits?

-gunz

Originally posted by techinspector1
gunz, read this first.....
http://www.holley.com/HiOctn/TechSer...fo/SCTech.html

Thanks for the reply Richard. Ironically, I read that yesterday. That's where I got the info based upon my decision on the 671. I just wanted to hear some thoughts from someone other than the website. What about the 1/2" and 8mm? I didn't see anything about that on their site - unless I missed it?

The 1/2 pitch is a square tooth style belt used for mild applications like the 671.
The 8mm is a round tooth belt used on higher boost applications.

I vote FOR the blower.

If its a daily driver-No. If its a crusier/street racer, sounds like fun. With the large hood and engine bay one the 65/66 trucks, you should also be able to abide by any blower regulations in your state

I run a few Weiand 671 on 350s and 454s, and the 1/2 pitch came with the set ups what I used, belts was not a problem. I did sling a few water pumps off of the motor and broke a few belts, but that wont the belts problem.

6-71 is big on a 350, you got the right internals for it or do you plan to rebuild?

The roots blower or 6/71 will add a new demention to your engine without a doubt. You must do it right with engine internals and quality parts so your money is not wasted but there are many TURN KEY kits with directions out there.
If you keep boost under about 10 PSI you can run a stock engine with exception to needing new cam. Stock cam will work but you give up potential and HYD. cam with boost is not good. You can get by with lower boost but cam /springs are pretty cheap and a small percentage of project. Over about 12 pounds boost starts to need O-rings ,good crank and so on. Be sure to get help on carbs. A blower carb sees 100 % vac. at base all the time and must be modified to work on a blower.
You cam run 1/2 inch belts as they are cheap and work great for your needs and tons of used parts available from years of use and people converting. You can buy a timming belt from a bearing supply house for about 45 bucks or get same belt from BDS etc... for double cost. 2 inch will also be great and gives a little more room up front. Be careful buying used blowers and get help inspecting from person that knows what to look for.

Well, it's not a "daily" driver. It gets driven about 3 times a week. Currently it's got a 350 bored 30 over, turbo 400, Pete Jackson gear drive, 292 cam, flat top pistons, Quadra Jet race carb, vette springs. I'm going with dual Holley 600's if I do go with a 671. I'm not certain on the forged internals but I guess that's something I better find out. It's got 600 miles on the motor.

drg84 - you made me think of another point. Would I have to cut the hood? I don't want to but if I have to, so be it. Could I squeeze one of those flat style air cleaners (help me out on the name if it's got one) on top and still be able to close the hood?

Originally posted by bigazzgunz


drg84 - you made me think of another point. Would I have to cut the hood? I don't want to but if I have to, so be it. Could I squeeze one of those flat style air cleaners (help me out on the name if it's got one) on top and still be able to close the hood?

The intake and blower together are about 12'' tall.

this is what a 454- 671 with 2 AFBs looks like on a 1980 el-camino. i dont think it will go under your hood eather.

With street supercharging, it adds a whole new dimension to low RPM GRUNT. Asensible set up is a lot of fun to drive on the street, and as a result you will probably develope eye frown as you keep one eye on the road and one eye on the temperature guage, My opinion do it and have a lot of fun, I sure did.

PS: blowers are loud as well as big.

What ya gonna call it Bro, BigBuxTruck , but if ya DO deside to blow it go with a 8-71, only about 350.00 more than a 6-71 and it keeps the intake temp LOTS cooler along with higher boost at low rpm's

Originally posted by viking
What ya gonna call it Bro, BigBuxTruck , but if ya DO deside to blow it go with a 8-71, only about 350.00 more than a 6-71 and it keeps the intake temp LOTS cooler along with higher boost at low rpm's

HA!!!! Is this Viking from CC? Actually, I ordered my plate last week....."ALL 2 EZ"

Back to the temp prob.....will it run a lot hotter than normal? I sit at about 190 driving and 210 if I get stuck in traffic....

Originally posted by bigazzgunz
HA!!!! Is this Viking from CC? Actually, I ordered my plate last week....."ALL 2 EZ"

Back to the temp prob.....will it run a lot hotter than normal? I sit at about 190 driving and 210 if I get stuck in traffic....

Big. Do you have a stock radiator now? An aluminum rad. will help some. Engine oil cooler. A bigger blower turning at lower rpm to get the same boost should help some. Aluminum heads. Where there's a will there's a way.

Well it's got a brand new radiator (not sure what size or make) with twin electric fans. Will that not suffice? What about that Purple Ice by Royal Purple radiator additive? Is that stuff any good?