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Author
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Topic: 289 or 302 heads on a 351W
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67nightmare
Gearhead Posts: 118
From: rose hill, ks, usa
Registered: Mar 2004
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posted 03-27-2004 09:09 PM
   
I am planning to rebuild a 76 351W shortblock I bought with about 35k on it and I am going to re-ring it and put in all new bearings it has been bored .030 over with stock type pistons. I don't have heads for it but I have a set of 67 289 2V heads and have acess to both early and late model 302 heads. Which ones would you use? I realize the valves are smaller than 351 heads so I'll probably try to find a set that has larger valves added already and I also want to do a little port work on them and of course a valve job with guides, seats, ect. So my question is what intake manifold, distributor, pushrods, rocker arms, head gaskets, what cam do you recomend (this is going to be mostly street engine and will see its share of street races but doesnt need to run 10's or 11's), valve sizes and spark plugs. The reason I want to swap on smaller heads is because I can't see the point in buying new pistons when the ones I have are in excellent condition, so adding these smaller combustion heads will raise compression. Also this will have to clear a stock hood in a 1967 Mustang and what headers would you recomend?
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-28-2004 12:01 AM
The early 289 heads will have the smallest combustion chambers.  SteveW
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N266fords
Gearhead Posts: 1404
From: Spokane ,WA USA
Registered: Apr 2003
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posted 03-28-2004 01:55 AM
You would have to have the 302 head drilled for a 1/2 bolt..the 302 uses 7/16 bolts.
Bruce
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67nightmare
Gearhead Posts: 118
From: rose hill, ks, usa
Registered: Mar 2004
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posted 03-28-2004 02:22 PM
Yeah I already knew about the bolt size differences but I was hoping that maybe someone who had done something similar to this in a 67 mustang might be able to shed a little light on the more complicated stuff like intake manifolds and what headers to use with the smaller heads. Thanks for those who did reply.
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-28-2004 03:46 PM
They are identical externally, so the same 351w intake and headers will work fine.SteveW
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67nightmare
Gearhead Posts: 118
From: rose hill, ks, usa
Registered: Mar 2004
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posted 03-28-2004 03:51 PM
Steve,
I realize by your name that you probably have a 66 but do you know of anyone who was performed a swap similar to this? What intake did they use to clear the stock hood and still make decent power?
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SteveLaRiviere
Administrator Posts: 43152
From: Saco, Maine
Registered: May 99
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posted 03-28-2004 07:17 PM
I don't think hood clearance will be too big of a problem on a '67 will it? They were available with 390 FEs, after all.What are the casting numbers of the heads you have available? ------------------
'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
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67nightmare
Gearhead Posts: 118
From: rose hill, ks, usa
Registered: Mar 2004
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posted 03-28-2004 09:31 PM
I'm not 100% sure about the casting numbers but the 289 heads came off my 67 289 2V. As far as the 302 heads, I work at an auto shop that does alot of late model work so they are the E7 heads I think they are called. They come out of 5.0 mustangs and one set in particular are from a 92 GT with the 5.0 HO. I can also get some late 60's to mid 70's 302 heads I don't know the casting numbers from them. At any rate though I am going to have larger valves installed because the 302/289 heads had smaller valves than the Windsor and I've been told all small block heads breathed poorly with the exception of 351C and Boss 302. I also want to have them milled and ported and polished. Is there anyway I can get a ballpark figure of how much compression I'll be making with the 302 or 289 heads. I have stock type pistons, I don't know the exact dome or dish on them, but isn't 76 351W compression pretty low?
Thanks
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Dubz
Gearhead Posts: 1718
From: Manitoba Canada
Registered: Oct 2002
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posted 03-29-2004 12:46 AM
your compression is probably around what my 74 351W is....8:1
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67nightmare
Gearhead Posts: 118
From: rose hill, ks, usa
Registered: Mar 2004
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posted 03-29-2004 11:53 PM
So what do you guys think, would I raise my compression form 8:1 to about 9:1 with the smaller, milled heads. Would 289 heads make much difference over 302 heads?
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-29-2004 11:56 PM
Honestly,You've got to get rid of those dished pistons. Flat toped pistons with valve reliefs and a 60cc head will give you about 10-1 compression, which is just right. SteveW
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RonnieT
Gearhead Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99
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posted 03-31-2004 05:02 PM
------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23 [This message has been edited by RonnieT (edited 03-31-2004).]
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