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Author
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Topic: how can i tell a 302 from a 351?
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infoseeker
Journeyman Posts: 52
From: cleveland, ohio, usa
Registered: Aug 2001
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posted 11-07-2001 02:25 AM
  
hey guys i need your help. i was just given a full motor but i dont know if its a 302 or a 351w... is there anyway to tell the diffrence? like are the heads diffrent? is there a sn on the block or part number or some marking that will say that its a 302 or 351? or would i have to mic the bore and stroke to tell the diffrence. cuz if its a 351 im gonna rebuild it and put it in my capri. well any help is appreciated-Bob w. ------------------
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Rory McNeil
Gearhead Posts: 1235
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 11-07-2001 03:57 AM
The easiest way I use to tell if I am looking at a 302 or a 351W, is to look at the front of the block, between the top of the timing cover & the bottom of the intake manifold end seal area. On a 351W, there are 2 angled "ribs", one on either side of the distributor. On a 302, there are no ribs. Also the 351W has a wider intake manifold than a 302, but unless you can compare the 2 side by side, its kinda tough to compare. One other thing, if you remove the distributor, the hole in the shaft that the oil pump drive rod fits into is 1/4" on a 302, & is 5/16" on a 351W. You can check this with the appropriate size allen wrench.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker under construction, 302 5 speed
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67coupe
Gearhead Posts: 405
From: dallas NC usa
Registered: Nov 2000
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posted 11-07-2001 04:53 AM
also another way is the waterneck on the front if u can get a socket and extenion on the bottom bolt its a 351 if not its a 302------------------
Josh
67 coupe with 351c
94 Explorer
30 model A currently rustbucket
in process 67 convt with efi 5.0 and t5
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Fastymz
Moderator Posts: 12015
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 11-07-2001 02:58 PM
If the intake is off mine says 351w right between the lifters and on the heads it is stamped 351w.
Ron
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Tom351
Journeyman Posts: 93
From: Marietta,GA
Registered: Mar 2001
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posted 11-07-2001 03:45 PM
Also, the 351 has about an inch of block between the cylinder deck and the flange for the water pump, while the 302 has they cylinder deck almost flush with the water pump flange.289/302:
351W:
------------------
67 Fastback - Arctic White Pearl paint
351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Carter 750 CFM, Comp. Cam 477/510 219/[email protected], Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars. [This message has been edited by Tom351 (edited 11-07-2001).]
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Dave Gibson
Moderator Posts: 7549
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99
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posted 11-07-2001 07:00 PM
Infoseeker,
The easiest way that I know of is to check the firing order. The 302 firing order is 1-5-4-2-6-3-7-8. The 351W firing order is 1-3-7-2-6-5-4-3. Hope this helps make things easy.  Dave & Terri ------------------
Poison Ivy (Dave's)
'65 Fastback Modified 289 4V, C-4, dual exhaust, styled steel wheels, rally pac, A/C
Blue Belle (Terri's)
'66 Coupe 351W 2-V, 4 speed, A/C, future sleeper.
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franklin
Gearhead Posts: 128
From: VA
Registered: Nov 2000
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posted 11-07-2001 07:47 PM
Check that firing order as cast numbers on the intake manifold, and not by how the sparkplug wires are routed, a 302 cam can be put in a 351w and vise versa, making things really confusing.
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SteveLaRiviere
Administrator Posts: 33988
From: Saco, Maine
Registered: May 99
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posted 11-07-2001 08:33 PM
If you remember the deck height/water pump outlet hole difference, it will only take you a glance to tell them apart.
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Tom351
Journeyman Posts: 93
From: Marietta,GA
Registered: Mar 2001
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posted 11-08-2001 09:24 AM
Steve is right, you can tell in about .002 seconds by looking at the deck height, also firing order can be misleading, my 351 uses a 289 firing order (since I bought the cam first thinking that I would build a 289/302)------------------
67 Fastback - Arctic White Pearl paint
351W ,Trick Flow Aluminum Heads, Edelbrock TorkerII, Carter 750 CFM, Comp. Cam 477/510 219/[email protected], Performance Automatic C-4 Trans, 3.55 gears, Front Disc Brakes, 1-1/8" Fr. 3/4" rear sway bars.
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Rory McNeil
Gearhead Posts: 1235
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 11-08-2001 12:36 PM
Also, all 5.0L HO 302`s from 82-95 used the 351 firing order.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker under construction, 302 5 speed
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Thud
Gearhead Posts: 1087
From: Cumming,Ga.,USofA
Registered: Jun 99
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posted 11-08-2001 02:05 PM
Man, I love this place! Ask any question and you get help (and illustrations!) I wish the rest of my world worked this well.------------------
"It only takes money" Dwayne M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
'69 Cyclone Spoiler II
'65 Galaxie 500 + parts car [This message has been edited by Thud (edited 11-08-2001).]
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