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Old 03-17-2009, 09:54 PM   #1
69RunningHorse
 
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Default 351 cam in a 302?

i just heard about this, is it really that beneficial? swap a 351 cam into a 302 and wire the plugs as 351. Anyone ever done this?
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Old 03-17-2009, 10:17 PM   #2
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the 351w uses a different (and better) firing order, ford started using the 351w firing order on 302's in the roller motors.
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Old 03-17-2009, 10:24 PM   #3
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so it wont it make a diff if i got a 94-95 gt ho motor, then will it?
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Old 03-17-2009, 11:35 PM   #4
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nope it wont
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Old 03-17-2009, 11:46 PM   #5
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that's what i thought thanks for the good info guys!
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Old 03-18-2009, 12:29 AM   #6
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so, if the 351 firing order is better, can you put a 351w cam in a 289/302 and just run the 351 firing order?
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Old 03-18-2009, 01:33 AM   #7
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Quote:
Originally Posted by 69RunningHorse View Post
so it wont it make a diff if i got a 94-95 gt ho motor, then will it?

the HO motor uses the 351w firing order already, keep in mind a mild cam on 351 will be hotter because of the less cubic inchs
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Old 03-18-2009, 10:02 AM   #8
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Quote:
Originally Posted by racin66coupe View Post
so, if the 351 firing order is better, can you put a 351w cam in a 289/302 and just run the 351 firing order?
that's the theory...
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Old 03-18-2009, 10:12 AM   #9
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Quote:
Originally Posted by racin66coupe View Post
so, if the 351 firing order is better, can you put a 351w cam in a 289/302 and just run the 351 firing order?
as what 69RunningHorse says.

here's the theory

you have four cycles: intake, compression, work and exhaust.
through those cycles the camshaft only turns once, but the crankshaft twice.
so the piston is fully up when engine ignites but again when it just pushed out the burned mixture through exhaust valve.

When you fire is regulated by firing order. the valves are regulated by the camshaft.

here's the 289 firing order

1-5-4-2-6-3-7-8

and here's the 351

1-3-7-2-6-5-4-8

you see the 1st, 4th, 5th and 8th cylinder fired are the same
1-x-x-2-6-x-x-8

and the 5-4 and 3-7 order is just interchanged.

No change on crankshaft, just the valve opening is turned at 180 degrees on cam on those 4 cylinders. firing order changed, job done.
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Old 03-18-2009, 01:53 PM   #10
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What is the benefit of the different firing order? More horespower? Better gas mileage? The car will magically wash and wax itself?
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Old 03-18-2009, 01:53 PM
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