....looks a corrected cap.
Firing order does not make sense
Thread Starter
Heel & Toe
Joined: Mar 2013
Posts: 18
Likes: 0
Firing order does not make sense
This is weird. Firing order on 75 HEI Vette is 18436572. Mine is 71623854. How can it be running? Could previous owner have adjusted timing so that order would work? Next question is what would first step be to get car back to correct order?
Le Mans Master
Joined: Mar 2008
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From: Oxford MA-----You just lost the game!!!!
Scott
Safety Car
Joined: Oct 2004
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From: Youngstown Ohio
That is an impossible rotation......recheck your wiring....start with #1 wire, check its position to see if it matches rotor pointing with #1 plug at TDC firing position. Then follow stock firing order clockwise.
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Le Mans Master
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Pull the left front spark plug, put your finger over the hole and have someone bump the starter until it blows your finger out of the hole. Then look at the timing marks on the balancer and further turn the engine until the line on the balancer and the ) mark on the tab are close to being aligned. Now remove the distributor cap and see where the rotor is pointing. That will be #1 firing position. Go from there.
Melting Slicks
Joined: Oct 2002
Posts: 2,317
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From: St Louis MO
So, unless you have a crazy crank designed by Salvador Dali, use the standard firing order 18436572, or in rare cases, the 18736542 order for a high dollar 4-7 swap cam. Pull all your old plug wires and start anew!
Le Mans Master
Joined: Dec 2007
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From: McHenry Illinois
Doesn't sound like a corrected cap after all. A corrected cap has internal cross overs so the wires come out all even on one side and all odd on the other.
Last edited by '75; Jul 7, 2013 at 06:53 PM.
Thread Starter
Heel & Toe
Joined: Mar 2013
Posts: 18
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After researching corrected caps on internet I know that is not what I have. Guess best thing to do would be to remove plugs and locate cylinder 1 at TDC, check location of rotor. Then follow firing order while verifying location of piston in relation to rotor. I never before removed anything without marking locations, my mistake this time was thinking I could remember. Painful/time consuming reminder.
Safety Car
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From: Orange County Ca
Race Director
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Melting Slicks
Joined: Oct 2002
Posts: 2,317
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From: St Louis MO
Lest anyone get the incorrect impression, the firing order of a V8 in ONLY a function of crankshaft and camshaft. Using a so-called corrected cap only changes where the wires are plugged into the cap, NOT the firing order.