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350 HOLLEY Jet size

General Tech Talk

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350 HOLLEY Jet size

Post by Wozza244 »

I have a blue 202 motor with a mild cam in it, extractors and a 350 holley.

It is using too much fuel, the plugs are black and the exhaust is black and blows a bit of soot when its loaded up.

I have opened it up and checked the jet sizes, 61's they are.

Anyone know whether i should be running the 61's with this engine or go lower eg, 55's 57's??
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Post by brad-chevlux »

what ignition system are you using?
what ignition timing?
how much manifold vacuum do you have at idle and cruise (70km/h in top gear)
what ignition system are you using?

61s shouldn't run that rich on a 202.
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Post by Wozza244 »

brad-chevlux wrote:what ignition system are you using?
what ignition timing?
how much manifold vacuum do you have at idle and cruise (70km/h in top gear)
what ignition system are you using?

61s shouldn't run that rich on a 202.
Electronic ign.
Dunno timing cause it has a cam, so its done by ear.
Havent got a vac gauge to test it mate will try organise one tho

Thinking of trying 57-58 or something

Any more help will be tops, cheers.
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Post by brad-chevlux »

I've seen alot of people blame jetting when the real problem is weak spark.

Don't change more then 2 jets sizes at a time.
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Post by Loanrangie »

I had a 350 on my RR with 3.5 and ran 59 jets and 65 power valve which was spot on for power and economy.
Saddle up tonto, its the not so loanrangie! . 98 TDI DISCO lightly modded with more to come.
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Post by sloshy »

Standard specs for that carb-

Jets-61
Power valve-85
Accel pump nozzle-31

Sometimes helps to go back to standard settings and start to tune from there.
cheers Dan

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Post by Wozza244 »

Cheers for the help people, but i blew the engine on my way home from work today....

FARRRRRRKKKKK!!!!!!!!!!!
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Post by sloshy »

Wozza244 wrote:Cheers for the help people, but i blew the engine on my way home from work today....

FARRRRRRKKKKK!!!!!!!!!!!
Sweet, now you can throw in a holden 355 or a chev :twisted:
cheers Dan

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Post by Wozza244 »

sloshy wrote:Sweet, now you can throw in a holden 355 or a chev :twisted:
Unfortunately not by the weekend!!!
I have a road trip planned, its our annual trip!!
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Post by mkpatrol »

Also, check your float level while you are at it. If its a bit high it may be flooding slightly.

Holleys are renowned for leaky powervalves. They are cheap to replace.

Does it have an Auto choke? I think there was an auto choke option, check to see if that is set correctly as this will make it run rich.

But as Brad said, check your ignition system first. how much compression has the engine got?

basics, basics, basics
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Post by 80's_delirious »

mkpatrol wrote:
basics, basics, basics
does a blown engine come under "basics"? :rofl: :rofl:
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Post by mkpatrol »

80's_delirious wrote:
mkpatrol wrote:
basics, basics, basics
does a blown engine come under "basics"? :rofl: :rofl:

Yep, if it doesnt have enough compression ;)
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