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Old 04-23-2008, 02:55 AM   #1 (permalink)
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351 Cleveland heads on 5.0?

What is needed to install a set of 351 Cleveland heads on a 5.0?
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Old 04-23-2008, 07:43 AM   #2 (permalink)
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Re: 351 Cleveland heads on 5.0?

Search term "clevor" will help you here. You will need a special (read pricey) intake. Why are you investigating this path? To be different? Because you have the heads? Some other reason?
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Old 04-23-2008, 07:53 AM   #3 (permalink)
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Re: 351 Cleveland heads on 5.0?

You need to drill and tap the 302 block for 7/16" head bolts or studs, and get a funky intake...
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Old 04-23-2008, 07:57 AM   #4 (permalink)
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Re: 351 Cleveland heads on 5.0?

Edelbrock is making an intake for this, as well as the AL Cleveland heads, which come with instructions for adapting them onto a Windsor block. Summit has this stuff in stock, or at least did a few weeks ago when I checked.
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Old 04-23-2008, 08:02 AM   #5 (permalink)
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Re: 351 Cleveland heads on 5.0?

I believe it requires special domed pistons, too, because of the different valve angles involved. Used to call it "poor man's Boss'.
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Old 04-23-2008, 08:18 AM   #6 (permalink)
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Re: 351 Cleveland heads on 5.0?

Quote:
Originally Posted by FEandGoingBroke View Post
You need to drill and tap the 302 block for 7/16" head bolts or studs, and get a funky intake...
The block is already 7/16 so no need to drill and tap it.
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Old 04-23-2008, 08:19 AM   #7 (permalink)
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Re: 351 Cleveland heads on 5.0?

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Originally Posted by FEandGoingBroke View Post
You need to drill and tap the 302 block for 7/16" head bolts or studs, and get a funky intake...
Umm... No. Already that size. No relavence, what-so-ever.

The main thing to deal with is the water passage. The 351C'd intake is 'dry', and the 302 has its water outlet in the intake. Therefore, the 351C head has to be drilled out for a water passage, and a special intake with 351C ports and a water passage in the front needs to be used. 351C heads have 1/2" head bolt holes, so what most people do is buy special shouldered bolts or washers that fit the larger head hole, but have the 302's 7/16" threads. The 302 block can also be drilled/tapped for 1/2" head bolts... but it's got to be done right, and straight. Pistons with the 351C valve reliefs will need to be used. If it's the stock 302 stroke, Boss 302 pistons can be used. Headers will also be an issue.

This used to be a very popular swap before all the aftermarket small block heads came out. Now, it's cheaper (and faster) to just use the aftermarket small block heads. Of course, it's also cool to 'dare to be different' if you're up for a challenge.

Good Luck!
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Old 04-23-2008, 08:19 AM   #8 (permalink)
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Re: 351 Cleveland heads on 5.0?

why not just use better aftermarket 302 heads. I have a pair I could use also, but too much work involved.. and I don't want to tear up my block just to use those heads. Seems to me like there are much better alternatives these days.
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Old 04-23-2008, 09:56 AM   #9 (permalink)
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Re: 351 Cleveland heads on 5.0?

as has been said, it depends on the motivation, if its cheap easy power, clevor(cleveland heads on Windsor block) is not the way to go. If he is trying to be different, go for it!!!
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Old 04-23-2008, 10:16 AM   #10 (permalink)
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Re: 351 Cleveland heads on 5.0?

Maybe sell the cleve heads for some decent $ to someone that is actually building a restomod Cleveland, they could help pay for new aftermarket heads. Me personally, would rather see Cleve heads on a Cleve motor that is goin into a BOSS resto or the like to hold onto history, and not bastardized onto a 5.0.....just my opinion.
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Old 04-23-2008, 12:50 PM   #11 (permalink)
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Re: 351 Cleveland heads on 5.0?

The Ford Motorsport catalog has a tech section that covers in detail the mods you need to do to the heads. Essentially you're building a Boss 302.
Flat top pistons in a 302 are fine assuming you don't put a super nasty lift cam in it.
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Old 04-23-2008, 03:46 PM   #12 (permalink)
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Re: 351 Cleveland heads on 5.0?

Boss 302 pistons should be used because of the canted valve arrangment.

Boss rods or 298 rods is a must when using Boss pistons with the different compression height. 302/5.0 rods are 5.090 Boss or 289 rods are 5.155 long.

When using 289 rods , look for hipo ones with the larger 3/8 bolts.

As mentioned 1 hole in each head needs to be drilled for coolant to pass. Boss intake to top it off.

A stock 302 intake can be modded if your using 2v heads.

When its all done, this Boss engine will be sluggish below 3k.

Todays new heads flow better down low and on top. They have REALLY come a long way. Cleveland heads are 38 years old.
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Old 04-23-2008, 08:51 PM   #13 (permalink)
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Re: 351 Cleveland heads on 5.0?

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Originally Posted by mel88643 View Post
Boss 302 pistons should be used because of the canted valve arrangment.
Not really true. Most 4V C cars came with flat tops with generic reliefs.
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Old 04-23-2008, 11:12 PM   #14 (permalink)
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Re: 351 Cleveland heads on 5.0?

Thanks for the info.
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Old 04-23-2008, 11:14 PM   #15 (permalink)
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Re: 351 Cleveland heads on 5.0?

Thanks for all the good info. This sounds like a good project
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