The 351 4V heads on a 302 makes a 302 Boss. That's what FORD did in the late 60's and early 70's. The 351 2V heads just make better horsepower in the lower band range. Those are cheaper and easier to come by. The 351 4V doesn't need any power adders. Just good non ethenol gas.
clevland 400 4v heads on a 302
would they bolt up and are there improvement in HP?
I read that the 4v might need a power adder to get the power out of them and the 2v's are harder to get.but i have a set of the 4v and i wanted to know what needs to be done to make them work.
I read that the 4v might need a power adder to get the power out of them and the 2v's are harder to get.but i have a set of the 4v and i wanted to know what needs to be done to make them work.
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It does however require some special machining of the block deck to install those heads.
And 4V heads are way to big for a 302 unless you're planning on your powerband being 4000rpm-9000rpm, with redline around 10K.
And 4V heads are way to big for a 302 unless you're planning on your powerband being 4000rpm-9000rpm, with redline around 10K.
would a supercharger work?
what manifold would work? and i would like to keep it fuel injected still
I don't think anyone makes a fuel injection manifold for a Boss 302.
And you get your powerband that high with a full-on race motor that will turn 9000rpm.
Or 400+ cubic inches of engine, in which case the powerband will be in a more realistic range.
And you get your powerband that high with a full-on race motor that will turn 9000rpm.
Or 400+ cubic inches of engine, in which case the powerband will be in a more realistic range.
The bore centers and bolt centers are the same so it will bolt up. You do, as noted previous, have to make some modifications to the deck and heads. The Cleveland engine from the factory has no water in the intake manifold and the thermostat outlet is in the top of the block. A specific manifold has to be used along with some new holes in the deck (and maybe the heads, I can't remember) to reroute the coolant flow. I have never seen an EFI manifold for a Boss 302.
Keep in mind that the Cleveland ports and valves, especially the 4v, are HUGE. On such a small displacement engine your intake charge velocities will be very low. This is what leads to an engine that really does it's work at high rpm. A stroker would help with displacement making more efficient use of the ports/valves.
I know it would be cool and all to have a BOSS 302, but you have a valuable set of heads that you might consider selling to purchase later model alum heads. It will be better all around and the weight difference will be substantial. Cleveland heads weigh about half a Yugo....each.
Keep in mind that the Cleveland ports and valves, especially the 4v, are HUGE. On such a small displacement engine your intake charge velocities will be very low. This is what leads to an engine that really does it's work at high rpm. A stroker would help with displacement making more efficient use of the ports/valves.
I know it would be cool and all to have a BOSS 302, but you have a valuable set of heads that you might consider selling to purchase later model alum heads. It will be better all around and the weight difference will be substantial. Cleveland heads weigh about half a Yugo....each.
well i have the heads already and a shop to build it.I have some help from family and he wants to make a racing engine.The bore centers and bolt centers are the same so it will bolt up. You do, as noted previous, have to make some modifications to the deck and heads. The Cleveland engine from the factory has no water in the intake manifold and the thermostat outlet is in the top of the block. A specific manifold has to be used along with some new holes in the deck (and maybe the heads, I can't remember) to reroute the coolant flow. I have never seen an EFI manifold for a Boss 302.
Keep in mind that the Cleveland ports and valves, especially the 4v, are HUGE. On such a small displacement engine your intake charge velocities will be very low. This is what leads to an engine that really does it's work at high rpm. A stroker would help with displacement making more efficient use of the ports/valves.
I know it would be cool and all to have a BOSS 302, but you have a valuable set of heads that you might consider selling to purchase later model alum heads. It will be better all around and the weight difference will be substantial. Cleveland heads weigh about half a Yugo....each.
he knows everything that was said on here but i always go here to double check cause i like to know for sure myself.
I was told the heads needed fixed for the water the block i wasnt sure of and would a 351 manifold work or is it really that specific?
Sorry, 351 manifold will not work. The one from the 302 is too wide to fit between the larger heads and won't match the monster ports. The Cleveland manifold does not have any water passages in it. Neither one will seal to the lifter valley of the other block. It has to be a specific manifold for the hybrid. Back in the day, I heard of people actually welding material into those ports to make them smaller, just so you know what your dealing with. I never was lucky enough to have a 4v, always had 2v.....but that was plenty.
Sorry, 351 manifold will not work. The one from the 302 is too wide to fit between the larger heads and won't match the monster ports. The Cleveland manifold does not have any water passages in it. Neither one will seal to the lifter valley of the other block. It has to be a specific manifold for the hybrid. Back in the day, I heard of people actually welding material into those ports to make them smaller, just so you know what your dealing with. I never was lucky enough to have a 4v, always had 2v.....but that was plenty.
my Father said he could make a manifold,i dont doubt him.but this will be a long project lol
I used to run a 4V Cleveland, and I can say that if you put those monster heads on a 302, you're shooting yourself in the foot. You could sell those and buy a performance set of 302 heads and make the same power without all the headaches of buying hybrid Cleveland parts, which are about 4 times the price of the 302 parts.
If you did do the swap, it would be almost undriveable on the street. As mentioned before, you would make absolutely no power until 4500ish rpms. Unless things have changed, 302's don't like to be revved to 9k rpms without major work, including a block.
I just think the project would be way too expensive and unrealistic for the amount of horsepower you would gain.
If you did do the swap, it would be almost undriveable on the street. As mentioned before, you would make absolutely no power until 4500ish rpms. Unless things have changed, 302's don't like to be revved to 9k rpms without major work, including a block.
I just think the project would be way too expensive and unrealistic for the amount of horsepower you would gain.
I used to run a 4V Cleveland, and I can say that if you put those monster heads on a 302, you're shooting yourself in the foot. You could sell those and buy a performance set of 302 heads and make the same power without all the headaches of buying hybrid Cleveland parts, which are about 4 times the price of the 302 parts.
If you did do the swap, it would be almost undriveable on the street. As mentioned before, you would make absolutely no power until 4500ish rpms. Unless things have changed, 302's don't like to be revved to 9k rpms without major work, including a block.
I just think the project would be way too expensive and unrealistic for the amount of horsepower you would gain.
i really just want a 351
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