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#1 |
Registered User
Join Date: Apr 2001
Location: Detroit Lakes, Minnesota
Posts: 885
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HELP 305 not running good
hey guys, i cant get my 67 k10 to run worth a crap, just bought the truck. its got a 305 sbc. ive put 3 different quadrajunk carbs on it. and done different timing along with dizzy cap and wires. it runs at idle pops out of the pass. exhaust pipe. warms up and goes away. going down the road it runs terrible. wont rev up etc.. but w/o a load on it it revs good. what could it be? im about ready to put a differnt engine in the thing
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1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles |
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#2 |
Senior Member
Join Date: Jun 2006
Location: Arkansas
Posts: 227
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Re: HELP 305 not running good
Sounds like timing and/or vac leaks to me.
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"They that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Ben Franklin |
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#3 |
Woof?
Join Date: Jun 2005
Location: Raleigh, NC
Posts: 276
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Re: HELP 305 not running good
Stupid question: what kind of plugs do you have in it, and are they pretty new?
Not stupid question: What type of distributor do you have? HEI?
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1968 LWB CST BB 2004 Avalanche Z71 LT3. 2003 S-10 ZR2 (hers). 1997 Astro 1992 Caprice wagon, 500k stock miles. Nursing wounds after a bad wreck. 1997 Saturn - need gas mileage from something! |
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#4 |
Registered User
Join Date: Apr 2001
Location: Detroit Lakes, Minnesota
Posts: 885
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Re: HELP 305 not running good
plugs are ac delco, they are good switched them... hei dist. didnt see vacuum leaks. ran a compression test and everyone was 125 and one was 100.. i found another 305 that runs awesome complete carb to pan for free, good friend of mine so i think im just going to do that. ive had hours in trying to get this thing to run better and it just wont thanks guys!
__________________
1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles |
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#5 |
Registered User
Join Date: Apr 2004
Location: Clanton, AL
Posts: 1,253
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Re: HELP 305 not running good
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85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days! ![]() 05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal! ![]() |
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#6 |
Woof?
Join Date: Jun 2005
Location: Raleigh, NC
Posts: 276
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Re: HELP 305 not running good
Depending on the age of the 305, and the cam it has, I believe stock specs for a 305 were 8 degrees BTDC at idle, about 600 RPM with an automatic. Make sure your vacuum advance on the distributor is working right, make sure the mechanical advance springs inside the distributor are working right. What do you have your plugs gapped at?
If the engine's not knocking or blowing oil, it's still good! Especially if you're getting 125 psi on each cylinder! Don't change a good engine.
__________________
1968 LWB CST BB 2004 Avalanche Z71 LT3. 2003 S-10 ZR2 (hers). 1997 Astro 1992 Caprice wagon, 500k stock miles. Nursing wounds after a bad wreck. 1997 Saturn - need gas mileage from something! |
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#7 |
Registered User
Join Date: Sep 2002
Location: DFW Texas
Posts: 2,270
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Re: HELP 305 not running good
Check and see if you have your dist vacuum advance running to a metered port like on the carb. Not straight to the manifold.
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#8 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: HELP 305 not running good
is the HEI wired to a direct 12V source or was factory resistor circuit retained?? // bad cam??
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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