HELP 305 not running good - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matt_field · 10-22-2006, 04:40 PM

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

RSRXION · 10-22-2006, 06:43 PM

Sounds like timing and/or vac leaks to me.

Werewolf · 10-22-2006, 08:34 PM

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?

matt_field · 10-22-2006, 09:18 PM

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!

grayw0lf · 10-23-2006, 10:18 AM

Quote:

Originally Posted by RSRXION

Sounds like timing and/or vac leaks to me.

Yup. I agree.

Werewolf · 10-23-2006, 04:30 PM

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.

ratrod67 · 10-23-2006, 05:07 PM

Check and see if you have your dist vacuum advance running to a metered port like on the carb. Not straight to the manifold.

cdowns · 10-23-2006, 05:19 PM

is the HEI wired to a direct 12V source or was factory resistor circuit retained?? // bad cam??

10-22-2006, 04:40 PM	#1
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	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 __________________ 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

10-22-2006, 06:43 PM	#2
RSRXION Senior Member Join Date: Jun 2006 Location: Arkansas Posts: 227	Re: HELP 305 not running good Sounds like timing and/or vac leaks to me. __________________ "They that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Ben Franklin

10-22-2006, 08:34 PM	#3
Werewolf Woof? Join Date: Jun 2005 Location: Raleigh, NC Posts: 276	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? __________________ 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!

10-22-2006, 09:18 PM	#4
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	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

10-23-2006, 04:30 PM	#6
Werewolf Woof? Join Date: Jun 2005 Location: Raleigh, NC Posts: 276	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!

10-23-2006, 05:07 PM	#7
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	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.

10-23-2006, 05:19 PM	#8
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: HELP 305 not running good is the HEI wired to a direct 12V source or was factory resistor circuit retained?? // bad cam?? __________________ 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

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.