Engine 302 That Thinks Its A 351

P

PDQ Pony

New Member

Dec 6, 2015

24

1

1

Nebraska

Mar 13, 2016

#1

• Mar 13, 2016

• #1

I am not a mechanic. My question is what would be the reason for changing the timing and firing order on my 302 to a 351? This is all within a 1965 2+2 fastback. The shop that put this wonderful 50 year old back together included in my purchase papers some of the specs on what they and others did to complete the rebuild. One of these pieces of paper stated that the firing order is that of a 351.
Any ideas what that is all about?
Thanks, I learn a lot from all of you.
Tim

 

grnhays

Member

Sep 21, 2015

63

21

18

Green Bay, WI.

Mar 13, 2016

#2

• Mar 13, 2016

• #2

The firing order for the 302HO is the same as the 351W, 1-3-7-2-6-5-4-8. Which didn't come out til 82

 

Last edited: Mar 13, 2016

horse sence

15 Year Member

Nov 29, 1999

12,205

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Wile Coyote's stunt double

Mar 13, 2016

#3

• Mar 13, 2016

• #3

Because a 289 and a 302 both use the same cam with the firing order of 15426378 and that means 1 and 5 fire almost at the same time and the thought is that it will beat the front main bearing out .The cams interchange between the 289 ,302 ,and the 351 so the 351 came is used to take some of the load off the front main bearing .And that is why you have a different firing order now .

 

tos

Founding Member

Apr 27, 2001

896

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Cincinnati Ohio

Mar 14, 2016

#4

• Mar 14, 2016

• #4

Yep what Horse said. So the short answer is that someone put a 351 cam in it.

 

rbohm

Founding Member

Apr 12, 2002

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204

tucson,az

Mar 16, 2016

#5

• Mar 16, 2016

• #5

what horse sence said. the only problem is that it loads the number two main bearing instead. i have seen 351s with spun number two main bearings.