[matts94sc]

I have an 85 302 And I am wanting to put 351 cleavland heads on it to make it a 302 boss a.k.a. clevor engine. So how hard is it to do? what all does it involve? Is it worth it? I am running it in a 86 mustang full drag no street. so does anybody have any clues?? thanks

[poncho62]

I'm no Ford guy, but I think that you would be much better off getting some aftermarket Windsor heads...................

[matt167]

takes a special intake that is no longer made.

["70" Cougar]

hey guys .. ive only herd of puting windser heads on the 302 . i have a cleavland and wow.. let me tell you.. those suckers are monsters ! i also have a spair set that i may part with

bill C

[derm]

Had a hand in a 'Clevor' mating 351W block with 6" Chrysler Rods, pistons from 400M, and Cleveland heads. It was a beast, and needed those heads to really take advantage of the extra stroke & aftermarket support wasn't there.

Can't see the benefit on a 302 with so many great flowing aftermarket 302 heads available that wouldn't require major mods. Cost could be negated or minimized by shopping smart, especially at race track swap meets.

[KULTULZ]

I personally could not see the cost needed to convert a 302 to a CLEVOR unless it was to be a stroker. But it can be done.

Also be advised that used BOSS heads and intake are available at somewhat reasonable cost and will save you all the machining costs (bolt on).

[nitro_baller4692]

don't 302's use a 7/16'' head bolt and a 351 use 1/2'' bolts?
just though if so there might be a problem.

[red65mustang]

stock 69' Boss "Clevor" 302= 11/1CR, solid cam and lifters= 290 flywheel HP

seems that many people have the Bud Moore prepared 70' Trans-Am car image stuck in their heads....

it was 487HP+ (14/1CR?) and absolutely nothing was stock, guessing $10,000 to build it today.....?

Camero's started winning in 68', champ's in 69'.....
302 Windsor heads were maxed out, Ford solution was Cleveland heads to win again with a 5 liter motor...champ's in 70' with the Bud Moore car

Boss 302 motor is still one of my favorites for a all round performance and driving street-strip car

much cheaper and easier today to build HP with aftermarket parts

[KULTULZ]

Originally Posted by red65mustang

stock 69' Boss "Clevor" 302= 11/1CR, solid cam and lifters= 290 flywheel HP

CLEVOR- A term used to describe resulting engine assembly by installing 335 Engine Series Cylinder Heads (canted valves) onto a Ninety-Degree Engine Series block.

The BOSS 302 used unique cylinder heads (and intake) that will go directly to the Ninety-Degree block with no special machining.

much cheaper and easier today to build HP with aftermarket parts

This is a matter of opinion.

[xntrik]

Originally Posted by nitro_baller4692

don't 302's use a 7/16'' head bolt and a 351 use 1/2'' bolts?
just though if so there might be a problem.

All aftermarket SBF heads have 1/2 in bolt holes and use hardened stepped washers on 7/16 bolt blocks to center the smaller bolts.

Unless you just want the WOW look of the Boss/Clevor, W style heads are better in every aspect.

I'd go for Twisted Wedge or AFR.

[red65mustang]

Kultulz, no doubt about it, you are a walking encyclopedia of Ford info so I'll ask....

besides the factory drilling the Cleveland heads for coolant flow to work with the Windsor block, and screw in studs and mammmmmmmmoth valves (in 69')....what else is unique to factory Boss 302 (Cleveland) heads?

The Boss 302 block is definitely "special", 4 bolt mains, screw in freeze plugs, etc, etc, which a home built clevor won't have

I've always looked at it as, the Boss 302 is the original "clevor"....after the Cleveland went into production (70'?)....rodder's started building 302 and 351 clevors

Ford trivia: the heads in 69' Boss were "special" cause the Boss 302 was available before the Cleveland motor was released for production and available

footnotes:
07' Ford is releasing a new Boss 302 block...less bucks than the sportsman block (about time!)
(?) Hugh's Performance in (?) Arkansas is still making all the Clevor goodies

[derm]

Never been a 302 fan, just because my new '67 Cougar is by far the smallest vehicle I've ever had, other than some imported stuff. Certainly have heard about the Boss motors, but didn't know they fell in the Clevor concept. Thanks for the education!

So, does this evolution carry thru to the Boss 429? Break that motor down for me, if ya would. Thanks.

As always, I'm after displacement. There's no replacement!

[KULTULZ]

Originally Posted by red65mustang

Kultulz, no doubt about it, you are a walking encyclopedia of Ford info so I'll ask....

Most say I am full of it...

besides the factory drilling the Cleveland heads for coolant flow to work with the Windsor block, and screw in studs and mammmmmmmmoth valves (in 69')....what else is unique to factory Boss 302 (Cleveland) heads?

NO MACHINING is necessary with BOSS 302 heads as they were OEM installed on the 302. No special aftermarket intake or spacers are required with the retro-fit. The BOSS 302 intake is unique to the BOSS 302 cylinder heads. It already has the coolant provisions.

The Boss 302 block is definitely "special", 4 bolt mains, screw in freeze plugs, etc, etc, which a home built clevor won't have

Not necessary for a strret engine. The BOSS 302 was a factory released racing engine, something FORD very seldomly did.

I've always looked at it as, the Boss 302 is the original "clevor"....after the Cleveland went into production (70'?)....rodder's started building 302 and 351 clevors

Ford trivia: the heads in 69' Boss were "special" cause the Boss 302 was available before the Cleveland motor was released for production and available

You need to understand. The BOSS 302 heads were copied from the upcoming 335 Series for competition. The 335 was already to be released. Two entirely different engine systems are being discussed here.

Relationship Between Boss 302 and 351C

The Boss 302 is essentially a high-performance Windsor-block engine with “Cleveland” style heads. Boss 302 heads are essentially the same as 351C-4V Boss heads, except cast to accept intake-manifold sourced cooling water and with significantly smaller combustion chambers. 1969 Boss 302 heads used a 2.23” intake valve, with 1970 heads reverting to the 2.19” valve.

footnotes:

07' Ford is releasing a new Boss 302 block...less bucks than the sportsman block (about time!)

You don't need the upcoming block/short for street (IMO). I don't know why FORD marketing is referring to it as BOSS 302, as it is only causing confusion.

(?) Hugh's Performance in (?) Arkansas is still making all the Clevor goodies

CLEVOR TECH can be found at;

Bush Performance (501-646-9108).

PRICE MOTORSPORTS makes adapters to use about any intake on the CLEVOR.

-THE BOSS 302 STORY-

[red65mustang]

Derm, Boss 429 is a "FE" series motor, nothing in common with the Windsor/Cleveland Boss 302

not a fan of 302's?

Boss 302's often "wupped" boss 429's in the 1/4...some magazines tested it a a hair quicker, some a hair slower...with 127cu/in less in the same car and gears!

[xntrik]

Originally Posted by red65mustang

Derm, Boss 429 is a "FE" series motor, nothing in common with the Windsor/Cleveland Boss 302

not a fan of 302's?

Boss 302's often "wupped" boss 429's in the 1/4...some magazines tested it a a hair quicker, some a hair slower...with 127cu/in less in the same car and gears!

Fact but not truth.

Fat heavy engine with skinny tires can't hook up. Small engine wins. Neither one would run better than 14.0s out the door.

Old testing procedures were often vague at best, using a 5th wheel and often 2 people in the car to read the instruments, and not power shifting but driving as real world people did.

With decent exhaust, slicks, and a good "tune", the big Boss was extremely hard to drive but it was "THE BIG BOSS".