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Can I swap my crank and pistons, balancer,flywheel, etc from my 68 stang 302 to a new 5.0 roller engine block and avoid the trouble of retrofit a cam?
 

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Yes, you only have to grind off the rearmost lip on the crankshaft to match to the one piece seal block. I did it with a 289 crank into a late model block, worked beautifully.
 

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I don't understand why you would want to install your old parts in the newer 5.0 block. One of the benefits of the newer engine is that the crankshaft is lighter in weight to help make more horsepower. Plus you don't have to spend money on modifying the 289 crank to fit. Another thing is that some of the 5.0 engines came with a different piston compression distance and the pistons actually came out of the block about .003 and into the head gasket to raise compression a little, again to increase horsepower. The other benefit is to be able to run a Roller cam without the expense. That too is for more horsepower. All in all there is probably as much as 50 horsepower or more available if you choose to take advantage of it. Just keep the 289 parts in a 289 block and late model roller parts in a late model block.
 

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It's not hard if your machine shop understands what your after.
Remember though if you swap an early crank in, you also have to swap the balancer and flywheel/flex-plate to match the 28oz balance of the early crankshaft. This has the potential to have a $snow-ball$ effect if you don't have all the parts you need upfront.
 

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I don't understand why you would want to install your old parts in the newer 5.0 block. One of the benefits of the newer engine is that the crankshaft is lighter in weight to help make more horsepower. Plus you don't have to spend money on modifying the 289 crank to fit. Another thing is that some of the 5.0 engines came with a different piston compression distance and the pistons actually came out of the block about .003 and into the head gasket to raise compression a little, again to increase horsepower. The other benefit is to be able to run a Roller cam without the expense. That too is for more horsepower. All in all there is probably as much as 50 horsepower or more available if you choose to take advantage of it. Just keep the 289 parts in a 289 block and late model roller parts in a late model block.
If he has a fair amount of money in his setup it could be cheaper to use the roller block than buy the retrofit cam and lifters. I have seen roller blocks almost free and retrofit parts over $500. I have been there too. A lot of fox mustang guys also looked for 289 blocks because they have more material in them and can be stronger and bored larger. To me the larger imbalance was to make parts lighter and cheaper. I know the early blocks have more material in them because they weigh more and none of the head bolts go into the water jacket.
 
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