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Old 05-11-2009, 03:44 PM
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Power loss?

Ok saturday I worked on the car and fixed an exhaust leak. Adjusted the fuel regulater and thought I had the car running good.
It acts like its got a plugged exhaust. The fuel pressure was at 4.5 psi but it seems to be between 3 and 4 now. I will adjust it back up as it could have loosened I guess.
It does run a little hotter but I just figured it was do to the hot weather.
It dosent heat up any faster just a few degrees hoter that it use to run.

1984 Vette converted to a carb.

350 cu.in ~ 4 Bolt Main
Steel Forged Crank
HP Hypereutectic Piston Set 9.6 Compression
Set of HP Forged 5.7 Connecting Rods
0 Gap File Fitted HP Piston Ring Set.
Bowl blending, port match and exhaust port work,
with the chambers polished
All new guides,Hard cast iron .500 intakes
& (Thinwall bronze Exhaust)
All new forged stainless valves 1.94/1.5,
K-motion springs, moly retainers & hard locks
CHS RACING Hyd Roller Cam and Lifters
Crane Roller Rockers
Edelbrock Dual Roller Timing Chain
Edelbrock Dual Quad Tunnel Ram Manifold
2 Holley 4 Barrel HP 390 CFM Double Pumpers

Going to adjust the fuel pressure and pull the mufflers and see if it runs better.
Dont have a timing light but will pick one up after work.
Anyone have an ideas?

Last edited by Jake_Dragon; 05-11-2009 at 04:25 PM.
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Old 05-11-2009, 06:06 PM
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fuel pressure for carb should be around 7-9 psi

maybe timing is not advancing correctly ?


that or its a carb issue

one or the other it has to be.

youre on the right track regardless i believe,. with fuel pressure and checking the timing

i highly doubt its anything to do with exhaust



good luck!!
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Old 05-11-2009, 06:20 PM
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I bumped the pressure up to 5 - 5.5 psi I have had trouble with anything over 6 on a Holley carb.
It is better but still not right. I wonder if I got some bad gas. Thats something else I did this weekend is fill up the tank.

The only reason I think it may be partly due the exhaust is it had a pretty good leak and ran better until I fixed it now its a lot quieter and doesn't have any power.
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Old 05-16-2009, 08:49 AM
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Water vapor coming out of the passage side exhaust pipe. I don't have a compression tester but I don't think it matters now.
So it ran "OK" until it got up to temperature then as soon as the thermostat opened it started blowing steam.
Its not in the oil so I may get lucking with just a head gasket.
I have to work this weekend so I will probably order the parts and try and tackle it next weekend.

I now have two broken down cars. but like my friend at work pointed out I have 4 cars so its ok

Think I will start a new tread in engine tech section.
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Old 05-16-2009, 09:37 AM
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No cat. converter??
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Old 05-16-2009, 09:47 AM
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No it has shorty headers going to side pipe.
Steam out of the side pipe sealed the deal.
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