Cast iron 5.3 blocks
Cast iron 5.3 blocks I jus picked up two 5.3 blocks at a steal I thought got both short blocks for 100 bucks so from what I read and research the only difference between them and a 5.7 is jus the bore so with it bein cast iron what is the potential cid and still be durable I was looking to do somewhere between a 383 to 440 CID I know there are probaly a lot better blocks to start with but for 100 bucks for two shortblocks I couldn't pass it up any help will be greatly appreciated .
The 5.3l iron blocks can be safely bored out to 3.910 (LS1 standrard bore + .005). That would make a 383 with a 4.00 stroker crank. A 408" would take a LQ4 or LQ9 block + the 4.00" crank.
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Not quite. LS1 and LS6 standard bore was 3.898". There are plenty of piston choices at 3.905", for both stock and 4.00" strokes.
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Verdad Gallardo So basicly even tho it's a cast iron block it is still limited to the same CID of the 5.7 ls1 383 or 394 being the max and still have enough block left to still be safe
The largest I'd recommend with that 5.3L block is a 383ci stroker. That's 3.903" or 3.905" bore, and a 4.0" stroke.
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I know this is reviving a thread from the dead, beat, buried, shot, and decomposed....
But I have to ask this cause I am about to start on this project engine.
Does any cylinder grinding/clearance work have to be done to the 5.3 LM7 block GEN III (12567392 block ID number) in order to make the 383 stroker?
Can you use a stock 6.0 crank for it's 4 inch stroke and use forged rods and pistons to obtain this 383 CI displacement?
If the answers to the above are no for clearance work and yes on the crank, what kind of power levels would the engine hold up to reliably? And I do plan on using nitrous for drag racing (primary use of the engine).
And has anyone actually gone out to a 4.00 bore and the engine survive race use? I don't expect it to last for forever.. just a good season or two would suit me just fine. That will give me time to get another engine together and ready to go in when this one bucks the kicket.
But I have to ask this cause I am about to start on this project engine.
Does any cylinder grinding/clearance work have to be done to the 5.3 LM7 block GEN III (12567392 block ID number) in order to make the 383 stroker?
Can you use a stock 6.0 crank for it's 4 inch stroke and use forged rods and pistons to obtain this 383 CI displacement?
If the answers to the above are no for clearance work and yes on the crank, what kind of power levels would the engine hold up to reliably? And I do plan on using nitrous for drag racing (primary use of the engine).
And has anyone actually gone out to a 4.00 bore and the engine survive race use? I don't expect it to last for forever.. just a good season or two would suit me just fine. That will give me time to get another engine together and ready to go in when this one bucks the kicket.
what kcs said. you have to just see what rods you end up with mostly. every ls crank besides the 4.8 and ls7 are a 3.622" stroke. the ls7 has a 4" stroke but needs machine work for the crank to fit in a wet sump motor
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Joined: Jan 2004
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From: New Zealand
if you want a 408 just start with a 6.0l block and be done.
I have read of it being done, a 5.3 bored to 4", but i wouldn't recommend it with a power adder, as the cylinder walls would be getting thin. you would need to sonic test bores to determine thickness before boring.
if you want a 408 just start with a 6.0l block and be done.
if you want a 408 just start with a 6.0l block and be done.