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302 1-5-4-2-6-3-7-8
351 1-3-7-2-6-5-4-8
as you can see the the only thing they did was to swap the 2nd/3rd with the 6th/7th in the firing order. that works with the same crank, different cam.
I suspected the reason was to get rid of crossfiring issues for 7-8, but the 351 firing order has the same problem with 6-5
So the only explanation I have for this is a more balanced engine run. it's probably less stress or smoother, engine lasts longer ... somethign they probably could only figure in a long term test
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1964 1/2
302ci, Edelbrock RPM heads and cam, 650 speed demon, Long Tube headers and Flowmaster 40s
Quick Performance Racing 9" rear, Moser axles, 3.5:1 trac-loc from FRPP and T5 transmission.
CSRP disc brakes front and FRPP discs back. http://www.gascc.ie
i think it takes a little stress off the front of the crank that is generated by the 1-5 firing order - but im not positive on that.
i know there are cams for the SBC that swapped a couple cylinders firing order and they pick up extra HP - there's a good chance its the same deal on the Fords as well.
I had always thought it was because of the stress of the 1-5 order myself. but the 351 has the 4-8 on the tail end. Maybe they figured there was more support on the rear than the nose.
I was just curious...well, I also accidently ordered a cam that was the old firing order to put in the 5.0 to go in my '66. I guess that it won't hurt anything (that's what the cam guy said)...hell, the old firing order was used in the 289 race motors and Boss 302s.
I was just curious...well, I also accidently ordered a cam that was the old firing order to put in the 5.0 to go in my '66. I guess that it won't hurt anything (that's what the cam guy said)...hell, the old firing order was used in the 289 race motors and Boss 302s.
want hurt a thing!! the cam is the only part that knows the difference. the stress on the 1-5 was the reason for the change.
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73 Mach 1 riding around, drinking car
81 capri drag car
racing is real, everything else is just a game!!
Supposedly it was to revise main bearing loads, so probably the 1-5 issue people mentioned.
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Who cares how much horsepower it has, all that matters is how fast it goes!
13.20's with 2.25-2.30 60's, 40+ year old suspension sucks!
Best trap 107.11mph, we'll see what the new intake/carb setup does.
12.80 at 110.5mph NHRA DA corrected
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Why the 351W firing order?
