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Old Aug 23rd, 14, 07:27 PM   #1 (permalink)
 
Join Date: Aug 2014
Location: mishawaka
Posts: 1
Hot rod 350 2 lean spark plugs

Im having a problem with my chevy 350. I put a load of money into this engine. i checked my engine spark plugs today, 2 and 8 are running on border line lean. all other spark plugs are perfectly fine. i checked my compression on each cylinder. they all seem perfectly fine. maybe 3-5 off. if that. Reason why i looked into my spark plugs was because my motor was making a weird blooping sound. I personally think it's my exhaust honestly. I haven't lost any power. it revs up like it should. Im going to buy new spark plug wires and plugs for it soon. i'll start it up and spray ether onto the intake manifold to see if i have any leaks. if i don't have any leaks at all. the only thing could be wrong is my duel plain rpm gap intake isn't distributing the fuel correctly. please post below on what you thing.

engine specs:

350 bored 40 over
msd street fire 8.5mm super conductor spark plugs
2.02 dart alum heads
voodoo cam total lift .560
1.6 rockers
high volume oil pump 60-90+ psi
9.1 cp
670 street avenger carb
forged internals, complete balanced. (manufacturing companies dont balance them on a dime like they should.)
rpm air gap intake
3k stall
th350 tranny

the motor can do 9k rpm with correct camshaft and carburetor. it's set for street use only for now. but can be set up for oval track easily.
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Old Oct 17th, 14, 06:41 AM   #2 (permalink)
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Re: Hot rod 350 2 lean spark plugs

no intake out there is going to give you perfect fuel distribution to every cylinder(unless you port inject it) Odd are it's the front two plugs going lean and it's not unusual. Every now and then you'll get a rear that's lean but they tend to be fat under acceleration. Check the lash adjustment for ****s and giggles. Also, that cam is a baseline of probably 510 lift on a 1.5 rocker. Make sure your rockers are centering on the valves right. I had some problems with my Dart Iron Eagles using 1.6's. Had to play around with the guide plates quite a bit to make it all work right with no interference. If all else fails, for those two cylinders go a step or two colder on the plugs for those to holes? I bet it sounds sweet with that cam though!! Oh, and my airgap works just as good as my regular performer rpm on my little stroker motor.
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Old Oct 20th, 14, 02:46 PM   #3 (permalink)
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Re: Hot rod 350 2 lean spark plugs

Flat tops and 64cc chambers is 10.25:1 when you have 0.040" quench
If you have flat tops and 76cc chambers you would have 9:1 compression.
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Old Oct 21st, 14, 06:41 PM   #4 (permalink)
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Re: Hot rod 350 2 lean spark plugs

What are your jet sizes and PV size? What is your altitude ? Better yet , where is Mishawaka?
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Old Oct 21st, 14, 08:22 PM   #5 (permalink)
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Re: Hot rod 350 2 lean spark plugs

Mishawaka is in Indiana.
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Old Oct 22nd, 14, 08:58 AM   #6 (permalink)
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Re: Hot rod 350 2 lean spark plugs

Quote:
Originally Posted by onovakind67 View Post
Mishawaka is in Indiana.
Thanks, He is about 220' above sea level. My guess he needs to have more fuel with that air density.

Then again , may not be the issue. I am jetted for 3500 ft, when I hit the coastal areas at 10', I have to jet richer.
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TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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Old Oct 22nd, 14, 09:22 AM   #7 (permalink)
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Re: Hot rod 350 2 lean spark plugs

If that 670 is as-built, it's probably too lean. I had one that was right where it was supposed to be at wide open with less engine....355 with 76cc small valve 441 heads, flat tops, and a lot less cam (peak rwhp 263 at 5200 through a four speed). Tuning the idle mix will also have an effect on your part throttle fueling.
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