You know my dad used to sell outboard bots. The funny thing is that some of them use 302's(ford) and 350's(chevy).

You can get these for like free(well I did) because people will somehow mess them up. The engine block/crank shaft/pistons/heads/springs/valves were all included.

Come to find the one we got had run with water in the cumbuston chamber and had a bent rod, and after running it a little, found the block was warped(leaking water into cumbustion chamber) causing it to knock. Amazing, me and my dad did this in all of what, three days.

No lie, these ford 302 heads are strait identical to my 305 heads(they look interchangable).

 

I dont know if the ford heads are interchangeable. I beleive the ford heads only have 4 bolts per cyl whereas the chevy heads have five. The chevy heads are obviously usable but i dont know what castings they use on those motors.

 

They'll take a stock engine and then just change the stuff they put on it. Remember, boats aren't smoke regulated or sound regulated. It turned out the block from the boat and the block from the van were the exact same, everything lined up.

 

The marine blocks, from what I know, are made with higher tin and nickle contents. This makes the blocks better. The internals, cranks and pistons should be heavy duty forged. This is due to the extremely corrosive environments and extreme situations these engines are used under. 302 Ford and 305 Chevy heads should not interchange, due to the difference in valve locations and intake runners and exhaust runners. Hope this helps.:rockon:

 

Interesting enough, I registered with the ford forum so I could get help on identifing the numbers. I didn't ask about the block numbers but I did find that the #2 stamped on the pistons come from the 351 windsor. That makes me wonder what was modified to make a 302 a 351(deck hight?).

Ya, how many of you peeps have a chevy sitting next to a ford in your yard?

 

I tried that once, but the SBC kept sticking it's crank snout in the Ford's rear main seal and saying "Who's yo' dadday? Who's yo' dadday?"

 

well, there is a big differance.

 

the top ones are ford 302 and these are chevy

 

Oh please I would love to see you bolt on a pair of Ford heads to a chevy block. Please take detailed pictures on how you solve the bolt hole problem , the water passge problem , the pesky little intake manifold fitment problem , the minor problem of no distributor hole , the acc. bolt hole issue and blah , blah , blah......

 

a ford 302 and 351 are the same engine with a different stroke but same bore... different cranks.

 

I have a ford parked next to a pontiac. The bird goes HA HA you are a 4 banger pickup truck HA HA. and then the truck goes - And how are you supposed to get a new transmission if I don't go get it for you?

 

anyone that thinks a SBF and SBC head are anywhere close to the same needs to set the crack pipe down for a little bit and take another look. i'd think the siamesed exhaust on the SBC would be a big visual indicator that there may not be any interchangeability between the two.

 

The windsor family of blocks has the 260, 289, 302, and 351. The 302 and 351 can interchange heads, but the blocks are not the same, the 351 has a taller deck hight. Alo, there is a difference between the three 351'a Ford offered. The three are the Windsor, the Clevland and the Modified. As you may have noted, the heads between the 302F and the 305C are far from compatable.

 

chevy had a 302 in the 67-69 camaros, maybe he is really super confused ??

 

or mabey he knows jack about motors

 

Uhm

Ford
Intake-Exhaust-Intake-Exhaust


Chevy
Exhaust-Intake-Intake-Exhaust



Your cam would not work, period, regardless of the hundreds of other reasons they are not interchangable.


However Merc Cruiser = Chevy.

 

68 torino gt fastback 390 2 barrel, 69 cyclone fastback, 01 windstar, and an 85 f150 then my lonely chevy camaro

 

{Insert obnoxious buzzer sound effect here}

I have a MerCruiser "888" drive train in my boat, a 73 Sea Ray; it's a F*rd 302 with a Holley marine 2-barrel, 188 HP rated. Some "888"s came with a Rochester 2-barrel. How a 390 CFM Holley 2-barrel and a Rochester 2-barrel could conceivably be mistaken for producing the same HP, I'll never know; I had a friend who had a 74 some kind of boat also with a "888", the same 302 F*rd except with the Rochester, mine had so much more power than his it wasn't even funny. Merc also produced a "230" for a couple of years after that, which was a 351W with a Holley marine 4-barrel.

Boat heads are not usually any different from car heads. Most of the Merc 305s that I've seen heads off of, were 416s. My one little bro had some in his garage for a while that he got the exact same way: frozen motors from a boat shop. They're nothing special. On the other hand, because a boat motor runs at max HP when cruising at top speed, unlike a car which runs at max HP for a couple of seconds and then cruises at 10-15% of max HP, the bottom end takes a real beating; they tend to put the best cranks and rods possible in them. And of course the cams are different, to give the appropriate power curve for a boat.

Merc has used only Chevy motors since about 76 or so. They called a 305 4-barrel a "210" IIRC in marine trim, and a 350 a "260". A 454 is usually about 330 HP.

The huge majority of single-prop boat motors turn the same way as car motors. Twin-prop inboards sometimes have one that run backwards. However, outdrive motors like the Mercs in question have 2 identical shifting surfaces for forward and reverse, so usually they're set up so that the motors run the same way, but the props are mirror images, and the 2 transmissions shift the opposite ways. To make a motor that runs the opposite way, all you need is a different cam, different distributor, and a starter wired the other way. It's not very hard at all.

Anyway, apart from those few differences, a boat block and heads are the same as a car block and heads.

 

AJ,

You're friggin' KILLIN' me here man. Where do you get them all?

And the bigger outdrives usually have counter-rotating screws:

 

I'll have to post some pages out of my MerCruiser outdrive service manual....

Actually, almost all twin-prop boats have counter-rotating screws, becaus it makes the boat tend to go in a straight line, and it makes it that much easier to handle at low speeds like around docks and stuff. Single-prop boats are a real hassle by comparison. It's always fun to hang out at the dock and watch boats pull up to the gas pumps, especially on a windy day; you'll see one come up at a weird angle, everybody on board screaming out orders to everybody else, the boat eventually comes smashing up against the dock and knocks everybody on it onto their butt, the boat goes drifting off sideways with people trying to throw ropes at the dock and hang them onto something but they all miss.... then the next boat, everybody is just sitting there, the boat kind of idles up, the driver puts it in reverse and it stops and slowly drifts over to line up perfectly with the gas pumps, it just barely touches the dock and stops, and the person closest to a painter lazily sets down his/her beverage and casts it around the cleat which the driver thoughtfully brought the boat up exactly next to. Twin-prop boats can sit still and literally spin themselves around in a circle, and so hardly ever put on as good a show near the marina as your typical newly minted boat owner with a single prop.

 

No kidding 302 heads will not go on a 305.

My point was this:
Tell which from which in the dark.

I'll see about getting some pics of the 302 heads in the garage.
__________________________________________


Anyways, if your fortunate you might also find a block that has crome plated cylinders.

 

I'm good at 'one-liners'. Anymore than that and it burns my nose somethin' fierce.

 

Still gravy to tell ford heads from chevy, even in pitch black. Siamesed intake ports and center exhaust ports makes it easy. Well, unless you can't get your fingers in the holes in the dark.

Apart from being heavy pieces of iron with springs stuck to 'em, ford and chevy heads don't have much in common. I guess SBF is a little closer to SBC than an FE big block head though. Nevermind that the iron FE intake weighs more than a SBC.

 

i work at a boat dealership and if you can find a 5.7 vortec engine(newer volvo pentas)with cracked block that someone didn't winterize u might be able to salvage the heads. I actually got a 350 longblock for free but when i tore it down it had one cracked head.