Blower Set-Up - Team Camaro Tech
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post #1 of 4 (permalink) Old Jul 12th, 01, 07:00 AM Thread Starter
Join Date: Jul 2001
Location: Houston, Texas
Posts: 6

I have recently installed a Weiand 142 on my Edelbrock RPM 420 HP 355. Presently, the total timing is at 32 degrees before the boost timing retard system brings the timing to 24 degrees at 6 psi. I am looking for total timing and boost timing recommnedations.

Carburation is via a Barry Grant 750 w/ mechanical secondaries the primaries are 78's and secondaries are 86's. Again, suggests would be appriciated.
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post #2 of 4 (permalink) Old Jul 12th, 01, 01:23 PM
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Join Date: Nov 1999
Location: Dallas, Texas
Posts: 1,659

Those jets sound REAL big for a 350, but I know that blower carbs have special tuning requirements.

I have a 350 with an ATI Procharger centrifugal supercharger blowing 9 PSI. I run 34 degrees total timing, with 10 initial and 24 mechanical. All timing is in by 2,500 RPMs. My engine does not need the timing retarded under boost. I have aluminum heads and around a 9:1 compression ratio.

I would suggest buying (or looking at) a book on supercharging. I went to a local Barnes and Noble and read enough of the book to decide to buy it. But, you can sit there all day and read the whole thing if you want to. I think the book I bought was published by HP Publishing or something like that. It is the same company that publishes the How to Hot Rod "insert engine name here" series of books. The book has chapters on carb and ignition tuning.

I would suggest using a chassis dyno to tune your car. Use a shop that has O2 metering capability. It makes tuning a lot easier.

Pearl blue & white 69 Camaro with supercharged 350, Tremec TKO, and 3.73 12-bolt

See my website updated 4/16/01 at:
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post #3 of 4 (permalink) Old Jul 12th, 01, 03:23 PM
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,309

We have built several engines in the past few years with blowers. 2 were from BDS, two B&M marines, and a Weiand. Every time, I called the blower manufacturer and asked thier suggestions on the same items. They were all very helpful and gave me jetting and ignition numbers that were pretty much dead on from the start. Thats my suggestion. A phone call is cheap insurance. Anyone else is just guessing unless they have extensive blower experieince. I build engines for a living and I still make the call.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 family car...Brother bought it new in 73
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post #4 of 4 (permalink) Old Jul 13th, 01, 03:58 AM
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Join Date: Mar 2000
Location: Dtown PA
Posts: 820

Well said bill, sometimes even when we do things in such regularity its always nice to get a second opinion.

my timing comes in about 2K , but thats just because of the recurve and new spring kit on my distributer. I dont have a blower, but I always wanted a Weiand 671 hanging out of the hood,


Chris's 67 RS 327, Comp280,Flowmasters,shoddy interior, pepboys carpet and rusty floors and trunk can be seen at

[This message has been edited by Chris Edwards (edited 07-13-2001).]
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