455 help
October 12th, 2021, 10:54 AM
#1
The Tin Man
Thread Starter
Join Date: Oct 2009
Location: wny
Posts: 313
455 help
I have a 71 455 with 44,000 original miles.. runs great when cold.. warms up backfires and blows mufflers off... rebuilt distributor, new plugs wires, gas tank, gas lines, rebuilt carb.. Some are saying bad cam or sticky valve? Help...
this car sits for very long times and I would like to enjoy it... thank you Todd
this car sits for very long times and I would like to enjoy it... thank you Todd
October 12th, 2021, 11:44 AM
#2
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 48,227
Backfiring out the exhaust typically means the engine is too rich (excess fuel in the exhaust ignites when it hits the mufflers). This is likely caused by a choke that isn't opening when the engine warms up.
October 12th, 2021, 01:52 PM
#4
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 48,227
Hard to provide useful information with such a cryptic response. Is it a "rebuilt carb" (per your first post) or a "new carb"? What does "no choke" mean - is it not hooked up or is the choke plate removed completely? And what else is not hooked up or not stock? The mind reading thing isn't working yet.
October 13th, 2021, 11:16 AM
#5
The Tin Man
Thread Starter
Join Date: Oct 2009
Location: wny
Posts: 313
Have the original carb. Had it rebuilt.... still did it put a new holly on with no choke on it..... still did it.. put a 3rd carb on new Edelbrock with a manual choke same thing...
Last edited by The Tin Man; October 13th, 2021 at 11:16 AM. Reason: Miss spelled word
October 13th, 2021, 12:09 PM
#8
The Tin Man
Thread Starter
Join Date: Oct 2009
Location: wny
Posts: 313
Edl-1407 is the edelbrock number 750cfm
hly-0-3310s is the holly number 750cfm
the original is a Rochester quadrajet
It is the one I want to keep on it because it is original
I can take pictures when I get home I guess
hly-0-3310s is the holly number 750cfm
the original is a Rochester quadrajet
It is the one I want to keep on it because it is original
I can take pictures when I get home I guess
October 13th, 2021, 12:38 PM
#9
Registered User
Join Date: Aug 2020
Location: Dallas
Posts: 634
Installing a manual choke cable is pretty easy, and I am sure that there are many threads here on how to do that.
Good luck.
October 14th, 2021, 04:54 PM
#12
Registered User
Join Date: Oct 2014
Posts: 2,531
Both the Holley and the Edelbrock carbs you listed are manual choke models. Unless someone has gone to the trouble to mechanically remove the chokes on both carbs, which would be crazy to do since a carb needs a choke to operate properly when starting and in cold weather, then what you are experiencing is exactly as Joe described in the first reply, that the engine is too rich since the choke is not opening.
Installing a manual choke cable is pretty easy, and I am sure that there are many threads here on how to do that.
Good luck.
Installing a manual choke cable is pretty easy, and I am sure that there are many threads here on how to do that.
Good luck.
November 2nd, 2021, 01:02 PM
#15
Registered User
Join Date: Aug 2020
Location: Dallas
Posts: 634
Hey @The Tin Man any updates? Are you all good now?
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