Stumped
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Junior User
Joined: Oct 2003
Posts: 76
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From: cameron, wi.
Stumped
Hey guys any help would be fantastic! I have a 76 f250 with the 352 the heads were milled .15000, Interceptor manifold and a holly 650 d.p. It has new cam and lifters, new plugs, cap rotor and wires, good comp. good spark, but its backfiring in the exhaust and won't run. Rotor pionts at # 1 with 8 degress add. on the pointer, What am I missing or doing wrong? AARG! any help would be great. Thanks, Warren
Postmaster
Joined: Nov 2002
Posts: 3,447
Likes: 1
From: Littleton, CO
Did you just finish assembly and this is the first time under fire or was it running previously? Sounds like it is related to ignition, I would say even points. Are they adjusted correctly?
Just $.02 --Mike
Just $.02 --Mike
Elder User
Joined: May 2002
Posts: 799
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VACUUM LEAK???
You really milled 0.1500 from the heads?
What's your comrpression ratio?
Wow!
Did you also have the right amount removed from either mating surface where the intake meets the head?
Or from the bottom of the manifold?
You probably did all of right stuff, but if you happened tpo forget these, you could have a significant vacuum leak.
TIMING???
Oh, and i had similar backfiring symptoms when i tried to start mine up.
It turns out that I got the rotation backwards on the distributor and had the wires going to the wroong terminals. After seeing that, it took 5 minutes to get it right and then it fired right up. Or... are you sure you got the rotor to line up with #1 cylinder on its comreesison stroke?
Just things to think about...
Good luck with your restart!
You really milled 0.1500 from the heads?
What's your comrpression ratio?
Wow!
Did you also have the right amount removed from either mating surface where the intake meets the head?
Or from the bottom of the manifold?
You probably did all of right stuff, but if you happened tpo forget these, you could have a significant vacuum leak.
TIMING???
Oh, and i had similar backfiring symptoms when i tried to start mine up.
It turns out that I got the rotation backwards on the distributor and had the wires going to the wroong terminals. After seeing that, it took 5 minutes to get it right and then it fired right up. Or... are you sure you got the rotor to line up with #1 cylinder on its comreesison stroke?
Just things to think about...
Good luck with your restart!
Last edited by mlf72f250; Apr 21, 2004 at 02:38 PM.
Thread Starter
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Junior User
Joined: Oct 2003
Posts: 76
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From: cameron, wi.
The cam is a crane r.v. cam a little more than stock, hud. lifters, and i'm 99.99% sure the cam and crank marks were lined up, but mow with this problem i'm 2nd quesing myself. yes just finished ***. and the comp. ratio if i rememberd coerctly how its done should be about 10.5 to 1, 160# across all 8 cyl.
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
Compression stroke on number 1, rotor pointing to that terminal on the cap, check the firing order one more time, add a little fuel (tablespoonful), try again, then if it won't fire turn the distributor a bit to advance the ignition and try again. Sometimes just leaving it set until you have calmed down a bit helps, oh yea, beer helps! Let us know how this turns out, we enjoy a good story.
