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Discussion Starter #1
I just spent big bucks on having a 351w built. It's got a lot of goodies including AFR 185 heads, Performer RPM, Bigs Stage 5 650 Holley HP double pumper,Hooker SuperComp Ceramic headers,MSD,Canton, March, etc. So here's my question (actually 2 questions) The guy that built the motor put a Comp Xtreme cam #31-246-3 which is for a 289. Should he have gone with the same cam for the 351w? I read a post that the firing order in the 351w is better? Also, do I have too much compression at 10.5? In other words, can I run pump gas? I didn't build it for the track but would like to blow the doors off of a chevy if he acts like he wants to get burned. (I shouldn't be talking like this at 48 ) Thanks guys. I'll wait for your response.

<font size=-1>[ This Message was edited by: 67stang351 on 3/10/02 9:31am ]</font>

<font size=-1>[ This Message was edited by: 67stang351 on 3/10/02 9:37am ]</font>
 

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Thats the XE274.
274/286 adv dur
230/236 dur @ .050"
.520"/.523" lift

I think Just Jim runs that grind with a similar motor.
 

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289-302 15426378

5.0-351W 13726548

The 289-302 firing order hits the front main with both front cylinders firing right after each other. (1-5)

BUT, the 5.0-351W firing order does the same thing to the rearmost cylinders. (4-8)

Pick your poison. I don't think it's anything to get your panties in a wad about. Both firing orders have been tested to make the same power. If the block is being pushed to its design limit, you -might- think about buying another cam... otherwise, forget about it.

Good Luck!

_________________
Mike Burch, 66 mustang real street
302 4-speed 289 heads, 10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

<font size=-1>[ This Message was edited by: n2omike on 3/10/02 7:22pm ]</font>
 

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Discussion Starter #5
Thanks for the reply, Mike. Or actually the guy who built the motor thanks you. I was fixin to come down his throat!
 

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I may be wrong, but if you change from a 289/302 cam to a 351W cam, wouldn't you have to change the crank too?
 

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I know of some reasons that the 351W firing order (1372654
is prefered over the 289/302 (1542637
. One, there is a greater chance of crossfire between cylinder 7 & 8 in the 289 firing order. Two, I read somewere that ford found problems with uneven mainbearing loads on the 289/302's because of the firing order. Three, If you ever go fuel injection, the 5.0 stuff uses the 351W firing order. None the less, Ford used the same firing order of the 289 smallblock in the FE and 429/460 bigblocks with a lot of success? Matter of fact, I'm running a 289 grind in my 69 351W.
 

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