FordFan86

One of my mates told me that you could make a 351 BOSS by taking a 351C and a 351W and then mixn' and match'n different pieces of em..... i want to know what he was talking bout and if this was possible.
if so does anyone know which bits u gotta mix?

Peuty

Wtf?

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BACK II BACK

FordFan86

that's what i thought Peuty

GreenMachine

a 351 Boss is a Windsor with Clevo heads. it's more than a mix n' match job though...

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351C ZH MARQUISINATOR
Presenting, at great cost to management:
.020 over 351 Clevo, 10:1 comp, ported 302 heads, blueprinted and balanced, custom ground cam, Edelbrock intake, 600 Holley, K&N air filter, Custom Zip-Ties(tm), MSD ignition, Genie extractors, 2 x 2.5" exhaust, 2800rpm stally, rooted C4

Perana XR8

Yes your right the BOSS 302 Mustang used the 302w block and Clevo heads (I think 4v but im not 100%) and a different manifold to fit. I think rods and pistons were also specific to the BOSS motor. A 351w block can also be used. but IMO your better to use aftermarket alloy heads nowdays, than to try to get the specific manifold to fit.

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Ben

BlueAU

Were you smokin at the time your mate told you this?

FordFan86

I wasn't smoking...... but my mate (who worked at the servo station i work at) drives a torana and is a big holden fan.... go figure

XWish Ute

Nah, ya weren't smoking! Boss motor was a Windsor block with modified Cleveland heads and a unique manifold. I believe crank and rods were unchanged. The heads had mods to the water passages, and a few other areas - a search should give details as it would be really well documented.

leonbray

The original Boss351 released in 71 Mustang was a performance version of a Cleveland engine - similar to 4 bolt GTHO spec

You can make the equivalent of a Boss 302 for a 351W by using a 351W bottom end and Cleveland 4V heads. They are generally known as Clevors and you require a range of custom parts, such as the inlet manifolds

As anyone with a 4V Cleveland will tell you - they have nothing below 2500rpm and then they take off like a scalded cat - same with Clevor

You can get a better and cheaper combination with a 351W and alloy heads or 351C and alloy 3V head

Here's a recommendation from someone who built one

there's a tonne more to it than just bolting them on. Nevermind the custom intake, you need special head gaskets, pushrod's, rocker's, exhaust manifolds, etc etc etc... My advice?

Buy a set of windsor heads. You'll be alot happier in the long run

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Leon
68 Cougar XR7 (302W), 69 Cougar Convertible(302W), 70 Cougar XR7 Convertible (428CJ), 70 Cougar Eliminator (351 4V), 77 Cougar Villager Waggon, XY Ute (302W), XG Ute (IL6 XR6 replica)