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Old 08-18-2010, 10:51 PM
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355sbc carb issues 3310 dual pv

i have a mild 355, vortec heads dual plane intake to 6k, bout 9:5:1 4v slight dish 0.30 over pistons compression crane 272 ho cam good to 5600 v float 2500-3000 sweat spot 216 216 454 454 12 timing before carb is 3310 with the 2 power valves i took it apart it has 2 6.5 pv, 72/76 jets... stock is suppose to be 102p 8.5s im running a th400 with 2800 or less stall 4:10 gears line lock with noo power brakes or steering.. in a 84 camaro will this carb set at 6.5 x2 72/76 jets work okay or is it set up wrong ? I dont know enough to start to just throw jets and pv's at it anyone can do that I need some real advice on what some pros on here would do other then "the carb is too big" and put a 600 edelbrock on it... UNLESS that is all I can do.. I only want a decent peppy street driver that wont runs too rich. Thanx for any help.

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Old 08-19-2010, 06:05 AM
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The 3310-1 780 CFM, 4150 carb is jetted 72 primary/76 secondary and the PV's are 105 pri./85 sec., as delivered. The 4160 type of 3310 carb (-2 through -7, where my info stops) uses a 134-21 metering plate w/the equivalent to a 75 jet.

You set the power valve by how much vacuum you have at idle (in drive w/an AT, in neutral if a stick) and dividing that number in half.

You need to use the vacuum gage to set the idle mixture screws as well. Adjust them to give the highest vacuum at idle.

Your cam should deliver enough vacuum for the 65 PV's to be fine, but you still need to put a vacuum gage on it to see exactly what you need. I would try the carb as-is, then fine tune it from there.

Some additional info:

HOLLEY INSTRUCTION MANUALS BY P/N- http://www.holley.com/TechService/Instructions.asp

Exploded View and Nomenclature
Manual for Models
2010, 2300, 4010, 4011, 4150,
4160, 4165, 4175, and 4500- http://www.holley.com/data/Products/.../199R10014.pdf

HOLLEY TECHNICAL LIBRARY-
http://www.holley.com/TechService/Library.asp

http://www.bob2000.com/carb.htm

Remember- a LOT of "carb" problems turn out to be ignition related. The timing advance curve is VERY important as to how the car drives.

Here's a basic set-up to get you in the ballpark:

About 34-36 BTDC total (this does not include the vacuum advance. Remove the vacuum hose and plug it until the timing has been set before reconnecting it), all in by about 2800 RPM, with about 10-15 of vacuum advance. See where this leaves you as far as initial timing. You'd like there to be at least 12 BTDC at idle speed, more would be OK, but do not exceed the 36 total timing.

Connect the vacuum advance to a manifold vacuum source. If you were using a ported vacuum source, this will cause the idle speed to increase. Lower the idle speed back to where it belongs (~800 RPM) w/the curb idle screw. Readjust the idle mixture screws as described above.

If needed, there are adjustable vacuum cans like the ACCEL #31035. It's an adjustable vacuum advance can for the GM HEI that allows infinite adjustment to BOTH the amount and rate of advance. Comes w/instructions and tool.

If you find the can is OK but has too much advance, you will need to physically limit the vac can's travel w/a VACUUM ADVANCE LIMITER PLATE- Crane #99619-1; #99619-1 INSTRUCTIONS.

If you're unsure, or just want to check the accuracy of the tab/mark for TDC, DETERMINE TDC.

MAKE A TIMING TAPE will help you to see what your total timing is w/o having to use a dial back timing light.
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Old 08-19-2010, 06:38 AM
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If you have 12hg or more of vacuum at idle (read it like cobalt said) then the 6.5 is good.
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Old 08-19-2010, 07:14 AM
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Quote:
Originally Posted by bubbahotep
If you have 12hg or more of vacuum at idle ...then the 6.5 is good.
Right on! Holley had the 3310-1 set up to be a rich carb under any kind of load!
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Old 08-19-2010, 05:29 PM
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I think I found one problem tonight

I started my car the choike works I start to notics gas fumes blowing out my breather tons of smoke in my intake area and I noticed i can turn my idle screws all the way in on the front and it stays running.. I thinks I have a blown power valve I know the back one was new but the front was not checked.. I am also turfing this holley and going back to edelbrock... WAY to many problems with every holley I have ever owned. Thanx for all your advice..
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