cleveland heads

johnwb · 02-12-2006, 12:32 PM

Has anyone ever tried putting cleveland heads on a 5.0 H.O. block,I have heard of it being done on a 351 windsor,and it works with a few modifications.It works well on the 351, larger valves and a 1.7 rocker ratio,but you need a different intake.

vristang · 02-12-2006, 02:44 PM

The problem with the Cleveland heads is that they flow TOO MUCH air, especially at low rpms. This means that at low engine speeds the air charge does not build enough velocity to adequately fill the chambers. When Ford originally put these heads on the 302 the problem was a loss of power at low engine speed. If you are building a RACE ONLY motor, then these heads MAY be what you need.

Converting these heads to a 351w will be the same process as converting a 302. The deck height difference between 302 and 351w is still there so obviously a 302 Cleveland intake will not fit a 351w w/ Cleveland heads.

Personally I would not use the Cleveland heads on a 302 that needs to make power under 4-5k rpm. This includes ANY car that is going to see street duty.

84LX89GT · 02-12-2006, 10:56 PM

If you use the 2 barrel cleveland heads, they have 2.03 intake valves and 1.6 exhaust valves and flow pretty well stock, although the exhaust side is a weak spot because the port has a 90* kink in it. The 4 barrel heads are insanely large and i wouldn't use it unless i had a stroker 351W or were using a supercharger to help fill up those ports.

Oh....there are intake manifolds that work on these "clevor" engines and it used to be a more common swap before there was a good selection of cheap aftermarket 5.0L heads, so now you'd be hard pressed to find an offordable intake manifold for it if you can find one. You can buy a much better windsor heads and intake manifold for the price of swapping on cleveland heads and intake manifold.

02-12-2006, 12:32 PM	#1
johnwb 88lx work in progress Join Date: Jul 2005 Location: canada Posts: 62	cleveland heads Has anyone ever tried putting cleveland heads on a 5.0 H.O. block,I have heard of it being done on a 351 windsor,and it works with a few modifications.It works well on the 351, larger valves and a 1.7 rocker ratio,but you need a different intake.

02-12-2006, 02:44 PM	#2
vristang Registered Member Join Date: Feb 2006 Posts: 50	Re: cleveland heads The problem with the Cleveland heads is that they flow TOO MUCH air, especially at low rpms. This means that at low engine speeds the air charge does not build enough velocity to adequately fill the chambers. When Ford originally put these heads on the 302 the problem was a loss of power at low engine speed. If you are building a RACE ONLY motor, then these heads MAY be what you need. Converting these heads to a 351w will be the same process as converting a 302. The deck height difference between 302 and 351w is still there so obviously a 302 Cleveland intake will not fit a 351w w/ Cleveland heads. Personally I would not use the Cleveland heads on a 302 that needs to make power under 4-5k rpm. This includes ANY car that is going to see street duty. __________________ Check out my new Mustang website! - Including: TwEECer, EEC-IV, C&L, 351w Fox Swaps, PCV Oil Control, and more. 1990 GT - 408w - 17mpg TwEECer RT 1.30A10 - X3Z - A9L strat. / EA Forged Bottom End / Gapless Rings / CR 8.85:1 / Custom Cam / Ported Trick Flow Heads / Box Upr / Lightning Lwr 17x9 Cobras / Front 255s / Rear 275s / 5 Lug Cobra Disc Conversion / Auburn Ltd. Slip / 3.27 / 31 spline axles / Panhard Rod / Upr&Lwr Control Arms 1987 Red LX - 2.3L - Planning 2.3t Converison

02-12-2006, 10:56 PM	#3
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	Re: cleveland heads If you use the 2 barrel cleveland heads, they have 2.03 intake valves and 1.6 exhaust valves and flow pretty well stock, although the exhaust side is a weak spot because the port has a 90* kink in it. The 4 barrel heads are insanely large and i wouldn't use it unless i had a stroker 351W or were using a supercharger to help fill up those ports. Oh....there are intake manifolds that work on these "clevor" engines and it used to be a more common swap before there was a good selection of cheap aftermarket 5.0L heads, so now you'd be hard pressed to find an offordable intake manifold for it if you can find one. You can buy a much better windsor heads and intake manifold for the price of swapping on cleveland heads and intake manifold. __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)