351W heads on a 302 HELP! - Vintage Mustang Forums

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post #1 of 11 (permalink) Old 05-15-2004, 06:11 AM Thread Starter
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I am going to put 351W heads on a 302 engine. Here are my questions: Which push rods are correct to use - 351W or 302? Which intake - 351W or 302? What other "surprises" should I be prepared for? Thanks.
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post #2 of 11 (permalink) Old 05-15-2004, 06:38 AM
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Not sure about the push rods but the 302 intake needs to stay a 302 intake because of the 302 block. Also 351W heads take larger head bolts so you need special bolts for 351W heads on a 302, I pretty sure on that one but I have never done the swap. I have only read about it.

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post #3 of 11 (permalink) Old 05-15-2004, 08:28 AM
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ummm :: I trhought 351w's were 302 blocks w/351 heads on them, so if that is the case, doesn't he need 351 intake manifols? the 351 head is larger , so the angle will be greater in turn requiring the wider intake, hense the need for the 351 intake,

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post #4 of 11 (permalink) Old 05-15-2004, 09:06 AM
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The 351 W has a taller deck height, which in turn makes the engine block a little wider, which in turn reguires a 351 W intake manifold. I believe that everything else is pretty much the same and will bolt up. If you place a 351 W and a 289-302 intake manifold side by side you can definately see the difference in width.
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post #5 of 11 (permalink) Old 05-15-2004, 09:07 AM
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ummm :: I trhought 351w's were 302 blocks w/351 heads on them, so if that is the case, doesn't he need 351 intake manifols? the 351 head is larger , so the angle will be greater in turn requiring the wider intake, hense the need for the 351 intake,
It's the block that's bigger. Not the heads.

Lots of 289/302 combos around here with 351W heads on them.
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post #6 of 11 (permalink) Old 05-15-2004, 10:25 AM
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On my old 289 I had the 351w windsor heads. You use a 289 or 302 intake, and you don't need different head bolts, at least I used the ones that came off of the 289..

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post #7 of 11 (permalink) Old 05-15-2004, 10:37 AM
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Definately without a doubt use the 289/302 intake manifold. Also you could use the exhaust manifolds off the 302.

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post #8 of 11 (permalink) Old 05-15-2004, 10:55 AM
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The bolt holes are 1/2" versus 7/16" on the 289-302, so shouldn't you use a special bolt, or at least use some type of hardened washer to capture more of the bolt head's area?
And yes, you use 289-302 pushrods and intake.
Want some pushrod fun? Try putting early heads on a roller block ::

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post #9 of 11 (permalink) Old 05-15-2004, 01:07 PM
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302 intake
302 pushrods
use hardened 7/16" head bolt washers* for the head bolts.

*(Tip=Big block chevy head bolt washers much cheaper than the special "stepped" Ford head bolt washers and work just as well!)
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post #10 of 11 (permalink) Old 05-15-2004, 02:57 PM
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OK... here's what you need based on my research notes:

• Use 69-73. 69-70 have smaller chambers
• C9OE-B/C9OE-D & D0OE-C/D0OE-G are 60cc heads, 1.84I/1.54E
• For comparison, std/hipo 289 are 52-55cc (54.5cc) and 1.78I/1.45E
• Use 351w intake gaskets! (fordmuscle newsgroup post)
• Use 6.905 pushrods
• the only mod you may have to do is drill four 1/8" holes in the head (supposedly some sort of steam passage)just put your head gasket against the head and youll see where they need to be drilled (putting the head on a bench exaust port down, youll drill a hole above each chamber) see http://www.fordmuscle.com/phpBB/view...=18961&forum=1

- have the deck checked and leveled, use screw in studs and pushrod guideplates
- your intake manifold gasklet sb matched to block, notheads
-• 351W has 16 intake manifold to Cylinder head bolts vs 289 which has 12
• 351W heads are ½” bolt holes; 289/302 uses 7/16”
• According to ford site (www.fordracingparts.com/(586)468-1356):
o M-6065-D289* 351W type heads on 289/302 block
Use when installing stock 351W, Ford Racing cast iron (M-6049-L302/L303) or Ford Racing aluminum head (M-6049-Y302/Y303/X302/X303/X304/X305) on 289/302 blocks. Kit features 20 ARP® cylinder head bolts
• Ford Pushrods for 351W heads on 289 (flat tappet) pn M-6565-C332. 6.905” vs 289 6.804” $22.95 from summit, not currently available
- Cylinder Head studs (screw-in) ARP 154-4005 $106.95 154-4005 for 289/302 w/351w heads

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post #11 of 11 (permalink) Old 05-15-2004, 03:27 PM
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*LOL* I'm loving all the different responses. Here's my experience, though (I have '69 351w heads on my 289 in the '66):

Use stock 289/302 pushrods (assuming you're not switching to a roller cam)

I've used the stock 289 intake gasket, but currently have the Felpro gasket that is made for this swap. I have no idea what "made for this swap" means, as I couldn't tell it from any other 289/302 intake gasket. On a side not, I have tthe exhaust crossover blocked to keep a cooler fuel charge.

To compensate for the larger combustion chambers, I went with 10:1 flat top pistons when building my engine, as I already knew I was going with these heads. This kept my 289 at/near the stock 9.5:1 compression, otherwise the heads could be shaved to keep from dropping the compression.

I examined all the options available for using the 7/16" head bolts with the 1/2" holes in the heads. The option I liked best was using the Trick Flow shoulders (they are hardened grade 8 washers with a shoulder to fit into the holes in the heads), and then used standard ARP 289/302 head bolts. This was the cheapest solution I found that I felt comfortable with. This solution kept my head bolt cost to under $90. There are solutions ranging from this on up to about $600 for those people that have more $ than brains.

Since there's no difference in the heights of the heads, any 289/302/351w exhaust manifold or header can be used. Most headers specify for a small block Ford, not a particular engine, since there's no difference. The only reason they sometimes differ, is that if you have the 351w block, you'll have less side to side clearance in the engine bay with the wider block. The heads don't make a hill of beans worth of difference in the exhaust.

BTW, my heads are the '69 ones with hardened valve seats, screw in studs, guide plates, hardened push rods and Harland Sharpe roller rockers. I've been quite happy with them.

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