backfire through carb - Page 2

Wicked · 11-24-2005, 07:24 AM

Burnt or leaky intake valve? I know its generally the exhaust valves that burn but I guess its a possibility.

slvrbullit · 11-24-2005, 08:33 AM

I am gonna go along the lines of stephen, check the power valve, usually one backfire will kill them.

TheJeanyus · 11-24-2005, 09:06 AM

Quote:

Originally Posted by coupe

It's a cleveland motor.

Taller deck height than a 351C.

streetstang88 · 11-28-2005, 09:13 AM

i was thinking that it could have a large carbon buildup on top of an intake valve keeping it from closeing completely during power stroke.... i have checked timeing and fuel
and if one back fire can ruin a power valve then sounds like i have another problem to deal with ....guess i will have to rebuild the whole top end

i believe that 351c has a short deck ,351m has tall deck and 351c crank
385 series of big block

QWKSNKE · 11-28-2005, 10:12 AM

Quote:

Originally Posted by streetstang88

i believe that 351c has a short deck ,351m has tall deck and 351c crank
385 series of big block

yeah the M motors have a 10.2x deck height and 'big block' bell hosuing pattern. You can use cleveland heads on them though.

Its 335 series

1Quik85GT · 11-28-2005, 10:20 AM

Check the carb, gasket between the metering plate and bowls. There could be a hole that is bein blocked on the metering plate by a gasket. I have ran into that before.

385 series included 352,390,406,410,427,428 these are BBF's

351M,351 clevelands are considered SBF's

streetstang88 · 11-28-2005, 12:21 PM

see... i lernt sumthin'.... 385 series are FE motors

about the carb i guess that would cause a lean pop??
....if that is holding gas back

streetstang88 · 11-28-2005, 12:26 PM

yeah i ment to type 335 .....

wait i am callin

on my self

streatleathul · 11-28-2005, 08:01 PM

Back firing through the carb all the time even at an idle , you should ck the cam. One of your exh. valves are not opening, the presure is coming back through the intake.
You said the carb is new right?
Does the back fire get worse with a load. say going up hill?
Rick

1Quik85GT · 11-28-2005, 11:34 PM

Also could have jumped timing...

11-24-2005, 07:24 AM	#11
Wicked Friends Join Date: Dec 2004 Location: Pell City, AL Posts: 1,371	Re: backfire through carb Burnt or leaky intake valve? I know its generally the exhaust valves that burn but I guess its a possibility. __________________ 2001 Cobra 'Vert Procharged and Intercooled 455rwhp/441rwtq Work Car: 2005 Honda Odyssey 400 whp Turbo V6, 6-speed, full cage, H&R Suspension, Brembo Brakes

11-24-2005, 08:33 AM	#12
slvrbullit Super Moderator Join Date: Dec 2004 Location: on the water Posts: 1,280	Re: backfire through carb I am gonna go along the lines of stephen, check the power valve, usually one backfire will kill them. __________________ 2012 Jeep Wrangler Unlimited--- too many mods to list, about to be sitting on 1 ton axles. 2000 Ford F-350 Dually Lariat LE Crew Cab Short Box 7.3 auto 168,000 miles

11-28-2005, 09:13 AM	#14
streetstang88 Senior Member Join Date: Jul 2005 Location: confusion Posts: 184	Re: backfire through carb i was thinking that it could have a large carbon buildup on top of an intake valve keeping it from closeing completely during power stroke.... i have checked timeing and fuel and if one back fire can ruin a power valve then sounds like i have another problem to deal with ....guess i will have to rebuild the whole top end i believe that 351c has a short deck ,351m has tall deck and 351c crank 385 series of big block __________________ '89 LX 5.0 Hatchback (light blue metallic) t-5 ,traction lock ,high volume fuel pump underdrive pulleys, chip NEEDS MORE COWBELL

11-28-2005, 10:20 AM	#16
1Quik85GT Senior Member Join Date: Apr 2005 Posts: 895	Re: backfire through carb Check the carb, gasket between the metering plate and bowls. There could be a hole that is bein blocked on the metering plate by a gasket. I have ran into that before. 385 series included 352,390,406,410,427,428 these are BBF's 351M,351 clevelands are considered SBF's

11-28-2005, 12:21 PM	#17
streetstang88 Senior Member Join Date: Jul 2005 Location: confusion Posts: 184	Re: backfire through carb see... i lernt sumthin'.... 385 series are FE motors about the carb i guess that would cause a lean pop?? ....if that is holding gas back __________________ '89 LX 5.0 Hatchback (light blue metallic) t-5 ,traction lock ,high volume fuel pump underdrive pulleys, chip NEEDS MORE COWBELL

11-28-2005, 12:26 PM	#18
streetstang88 Senior Member Join Date: Jul 2005 Location: confusion Posts: 184	Re: backfire through carb yeah i ment to type 335 ..... wait i am callin on my self __________________ '89 LX 5.0 Hatchback (light blue metallic) t-5 ,traction lock ,high volume fuel pump underdrive pulleys, chip NEEDS MORE COWBELL

11-28-2005, 08:01 PM	#19
streatleathul Member Join Date: Oct 2005 Location: Dothan Al. Posts: 32	Re: backfire through carb Back firing through the carb all the time even at an idle , you should ck the cam. One of your exh. valves are not opening, the presure is coming back through the intake. You said the carb is new right? Does the back fire get worse with a load. say going up hill? Rick __________________ streatleathul

11-28-2005, 11:34 PM	#20
1Quik85GT Senior Member Join Date: Apr 2005 Posts: 895	Re: backfire through carb Also could have jumped timing...