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Author
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Topic: Tuning advice please
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 03-21-2002 04:09 AM
   
Given the air-fuel curve below. What jet changes do you suggest??
The engine is a Cleveland 377 with an 850 holley, 250/257 @.050 cam, 2" headers, 3" exhaust.anyone??  Thanks
Paul
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the last dive
Gearhead Posts: 147
From: sydney australia
Registered: Dec 2001
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posted 03-21-2002 05:20 AM
quad webers:P
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67Coupster
Gearhead Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001
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posted 03-21-2002 06:49 AM
What jets are currently in that 850 and does it have a secondary power valve?------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.34 @ 96MPH 1/8
1.66 60'
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 03-23-2002 12:09 AM
80 in the front 86 and no power valve in the rearThanks Paul
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67Coupster
Gearhead Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001
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posted 03-23-2002 06:13 AM
The reason I was asking I run the same carb and I thought your A/F ratio looked pretty close. Just wanted to compare. I just changed over to a power valve plug and jet extensions on the secondary side. Stock my 850 had 80/80 jets in it along with prim. and sec. power valves. Just put it back together yesterday with the new parts and I set it up with 80/90 jets. I figured if I was going to be off I better error to the safe side. From what I've read you need to go up 8 to 10 jet sized when removing the power valve and that you need to richen up with jet extensions also, hence the #90 jet starting point. Does anyone see anything wrong with this starting point? ------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.34 @ 96MPH 1/8
1.66 60'
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kid vishus
Gearhead Posts: 6590
From: middle of NC
Registered: Oct 2000
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posted 03-23-2002 09:37 AM
When I was runnign without a power valve in back, I always ran about a 6-8 number split form fornt to rear. One carb I bought came form Holley with a PV plug in back, and it was jetted 8 numbers rivher in back from teh factory, so that should be pretty close.
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67Coupster
Gearhead Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001
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posted 03-23-2002 01:19 PM
Thanks, I'll just leave it like it is and see how it does tomorrow. Later!!------------------
James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.34 @ 96MPH 1/8
1.66 60'
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 03-23-2002 05:16 PM
So what should I do?
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kid vishus
Gearhead Posts: 6590
From: middle of NC
Registered: Oct 2000
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posted 03-23-2002 07:24 PM
quote:
Originally posted by Clevo377:
So what should I do?
Sorry,  I have no idea. I have never had a motor dynoed therefore I have no idea what to look for on a chart like that.
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