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01-10-2005, 08:47 AM | #1 |
Registered Member
Join Date: Jan 2005
Posts: 4
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fireing order again
I am asking again to make sure to the fireing order on this motor,The rescue squad bought this motor and it had a burned valve in it so we went to get it fixed.Now this motor is in a big boat,they told us that the head was cracked beyond fix but they had a 302 head that would work.The broke head was a 351 winzor head,so we bought it and put it on.The motor runs great at a idle but when you shove the coal to it ,it backfires through the carb.I know that the fireing order is correct for the 302 but someone told me that that motor was a older one it was a 302HO MOTOR IN WHICH IT HAD A WINZOR CAM shaft,well the fireing order for a 302 will not work as I am told The Question I am asking is the fireing order for the 351 winzor going to work 13726548 any help on this we would thank you very much for we need this boat for water Rescue
Marvink |
01-10-2005, 09:03 AM | #2 |
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Join Date: Sep 2004
Location: jersey
Posts: 147
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Re: fireing order again
I’m an up and coming gear head so I’m still learning , but from reading your post if you have the firing order wrong the car won’t run right at idle either so I would think your back fire lies else where, did you check the timing ?
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01-10-2005, 09:52 AM | #3 |
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Join Date: Dec 2004
Location: Canada
Posts: 25
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Re: fireing order again
That is the correct firing order for a 302HO and 351W but the older 302's use a different firing order.
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BABYS ARE BOTTLE FED, REAL MEN GET BLOWN!!!! |
01-10-2005, 10:40 AM | #4 |
Registered Member
Join Date: Sep 2004
Location: jersey
Posts: 147
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Re: fireing order again
ok here ya go my hanes manual says this 1979-1993 5.0 HO 1-3-7-2-6-5-4-8
All others 1-5-4-2-6-3-7-8 hope this helps |
01-10-2005, 11:16 AM | #5 |
Rat Killer
Join Date: Aug 2002
Location: Cold ass Ohio
Posts: 1,143
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Re: fireing order again
Bottom line: ALL 351w and 302HO motors use 1-3-7-2-6-5-4-8 period.
If you take an older 302 which uses the 1-5 firing order, and swap in a 351 cam, it'll use the 1-3 firing order. That's exactly what I did, used a 1980 truck 302, 351 cam (and firing order), and some other goodies and had it going 11.71 at 118MPH. Your backfire is caused by something else, not the firing order. You got that part correct. As far as the heads go, a 302 won't "bolt on" to a 351 block. ALL 302's use 7/16" head bolts, 351's use 1/2". Have a machine shop drill out the holes and you'll be fine. However, I personally would NEVER EVER run one 302 head, and one 351. Heads HAVE to match. If you're gonna change them, change them both. I have a set of 1969 351w heads that need gone over, but aren't cracked or otherwise trashed. I'm a union firefighter, so if you're using them on an FD boat, I'll be happy to help out. Let me know on here, or PM me.
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d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply..... |
01-10-2005, 07:26 PM | #6 |
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Join Date: Jan 2001
Location: Moline Il
Posts: 901
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Re: fireing order again
1-2-6-and 8 will fire correctly, but 3-4-5-and 7 wont.
Andy
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01-10-2005, 10:08 PM | #7 |
Rat Killer
Join Date: Aug 2002
Location: Cold ass Ohio
Posts: 1,143
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Re: fireing order again
Years ago when I wrenched on heavy equipment, we had a Grimmerschmidt air compressor, you know the big mobile jobsite trailer ones. Anywho, all it was was a basically stock 351w and an air tank. Had a special head over 5-6-7-8 to pump the air, and it ran on 1-2-3-4!! Factory distributor and everything. Just grounded the plug wires for 5-8. Quite impressive, it actually ran really well on 4 cylinders.
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d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply..... |
01-11-2005, 08:39 AM | #8 | |
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Join Date: Jan 2005
Posts: 4
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Re: fireing order again
Quote:
Thanks Again Marvin |
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