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I bought a car that the original owner blew up his 327-300hp. By looking at receipts he must have really scattered the bottom end. He bought a 350 Chevrolet(Not Corvette)Block ,with 4 bolt mains, I'm guessing he used his heads, water pump. oil pan, exhaust manifolds, etc. I want to switch it back to a 327 300 Corvette. Can I use the 4 bolt main crank(I doubt it), can I use the connecting rods. Just in case he bought a used motor will the water pump, heads(They have the hump on the heads), distributor, from a 350 work for a 327?? I've assumed 327 to 350 interchange??
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Re: 327 to 350 interchangeability
if the 327 is a small journal crank, only way you'll fit the 350 crank is by turning it. i'd take the valve covers off, get head casting # and casting # off exhaust manifolds and band on distributor and then compare those #'s with what's appropriate for your vette(if you'd have included the year of your vette in the question, it'd have made it easier for us to ansewer your questions). oil pan and water pump will bolt right up but then agian, you need to study the casting # of pump and configuration of the oil pan to determine if they are appropriate for your vette. good luck , mike -
Re: 327 to 350 interchangeability
Only if it's a '68, which was the last year of the 327 and only year it had the "big" 350 bearing sizes.
If you want a "correct" 300 HP engine for a pre-'68 model, then you will need to start out with an "870" block, but a crank, rods, and pistons will have to be "327" parts.
I'm not sure how readily available 327 small journal cranks are, but Eagle introduced a high strength small bearing rod last year that is about the same mass as the OE small bearing rod for about $200 a set.
At that price it doesn't make sense to do anything but replace the original 327 rods, which are weak, particularly the first design that was used through '65. The second design that was introduced in 1966 is better, but by the time you Magnaflux, install new high strength bolts, and resize, you've spent the equivalent of the cost of these new Eagle rods.
Like Mike said, we need the year of the car, and the block casting number to ID the installed block.
DukeComment
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Re: 327 to 350 interchangeability
870 is cool for a 63, 64 and 65 327 but the 66 and 67 327 casting #'s were 174 and 657 respectivly. mikeComment
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Re: 327 to 350 interchangeability
Don-----
If what you're interested in is making the car NCRS-correct, then, by all means, find the correct components and install them. As you say, you may have the original heads, manifolds, and other parts already.
If what you're interested in doing is having a great running street engine, I think you're better off with the 350.In Appreciation of John HinckleyComment
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Re: 327 to 350 interchangeability
Don,
In addition to what others have said..
If you use the small journal 327 crank, 350 rods will not work, the journals are larger.
I know people have turned 350 crank mains down and installed them in 327 blocks. I don't know what clearance problems may occur between crank weights and the block.
Generally, 350 heads, exhaust, intake, water pump, etc will bolt to a 327 block and vice versa.
VerleComment
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Re: 327 to 350 interchangeability
turning a 350 crank down to fit a 327 small jounal block is no problem. hell, i know some fool who just turned a 350 crank to fit a 548 block with just minimal block grinding. Mr 283 will end up Mr 330 ci. merry christmas. mikeComment
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Re: 327 to 350 interchangeability
And with a 125 thousands bore job you will have a ..... 350!
Verle
Merry Christmas and Happy New Year to all.
VerleComment
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Re: 327 to 350 interchangeability
sonic testing ruled out 1/8" overbore. mikeComment
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Re: 327 to 350 interchangeability
They are becoming a little scarce, but if you want to build a really healthy small block and still use all of your parts (heads, intake, ex manifolds, dist, pan, pump, etc, etc), locate a good rebuildable SB400. All of the external parts will be a direct bolt-on, except you will need a harmonic balancer and flywheel for a 400 (unless you spend the extra $$$$$ to have it internally balanced). Except for casting/date codes, you can make a SB400 (to the untrained eye) look just like an original 327, and have gobs of power to boot!Comment
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