How safe would anybody feel running a 4.000 stroke in a 5.3 block? What about a 6.0 block?

 

Plenty of ppl ran 4in strokes in 5.3s I have a 4in in my 6.0 works just fine

 

What would be the "preferred" rod length choice to go with a 4.000 stroke in the 5.3?? 6.000, 6.125, 6.350?? Also do you need to cut the cylinders to clear the rods?

 

I guess what im getting at here is that im starting from the ground up.. 4.000 crank is whats available to me, so i want to build around that. Have a 5.3 block and a 6.0 block available if needed for 500 bucks

 

One of the most common engine setups you will find on here is a 408ci which is a 6.0 block bored 0.030 with a 4" crank and 6.125 rods. Also, if your block is good enough, you may be able to do a light hone with a 4" crank and 6.125 rods which would be a 402ci.

If you want to use the 5.3 you will also want to use the 6.125 rods with the 4" crank I believe which would put you at about 359ci. You could also bore the 5.3 out to a stock Ls1 bore of 3.898, which with a 4" stroke and 6.125 rods would give you 382ci.

 

Will the extra cubes from the 6.0 be worth the extra 500 bucks? Looking to keep it weekend/cruiser still. Only looking to make around 400-425 to the tires

 

425 to wheels isn't big power for a 383, 402, or a 408.

For me it would depend on which build was the cheapest. Then put the rest of my money in a nice set of heads and a cam to match.

 

The cheapest would probably be the 383 because the block is $500 cheaper to start and the Ls1 pistons are fairly cheap as well. As long as the machine work required doesnt total over $500 you will come out cheaper than doing a 6.0. A 402 would be the next cheapest as long as you can find a block that only needs a light hone. As stated above, you can get 400 to the ground with any of the 3.

 

Im running a 4.125 stroke, 6.125 rod, 3.905 bore to make a 395 cubic in.