Building a 4.8
07-15-2010, 12:30 PM
#1
Building a 4.8
I know it's only a 4.8l but I couldnt pass up the deal. Picked up a used 4.8 out of a wrecked truck for only $300 with everything but the alternator a/c brakets.
Anyways, i'm trying to see what direction to go with it, and I jut had a few questions.
What is Max bore on this block? I know the stock bore is: 3.779'' (96mm)
Stroke is 3.267'' (83mm)
Is it possible to bore it out to a 327 ci? I know a small block is 3.25 bore and 4'' stroke so it's pretty close.
If there are any other comments or suggestions anyone has it would be great.
Anyways, i'm trying to see what direction to go with it, and I jut had a few questions.
What is Max bore on this block? I know the stock bore is: 3.779'' (96mm)
Stroke is 3.267'' (83mm)
Is it possible to bore it out to a 327 ci? I know a small block is 3.25 bore and 4'' stroke so it's pretty close.
If there are any other comments or suggestions anyone has it would be great.
07-15-2010, 08:32 PM
#4
Yeah but whats the point, i'm making 600HP/TQ+ on a small turbo, thats with me tuning very safe because it's all stock. Get a set of good springs, good internals, rev it to 7-7.5k and put a big turbo on it. 750HP+, or whatever you really want and 3k of usable powerband.
To each their own, but I think a high revving 4.8L would be a fun setup.
However, if your stayin N/A, thats a different story.
To each their own, but I think a high revving 4.8L would be a fun setup.
However, if your stayin N/A, thats a different story.
07-15-2010, 09:06 PM
#5
thanx foose, you brought a very good point. think thats the reason the op started this thread. to get an idea of which way to take this project. so now he has options for na and fi.
07-15-2010, 09:15 PM
#7
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Yeah but whats the point, i'm making 600HP/TQ+ on a small turbo, thats with me tuning very safe because it's all stock. Get a set of good springs, good internals, rev it to 7-7.5k and put a big turbo on it. 750HP+, or whatever you really want and 3k of usable powerband.
To each their own, but I think a high revving 4.8L would be a fun setup.
However, if your stayin N/A, thats a different story.
To each their own, but I think a high revving 4.8L would be a fun setup.
However, if your stayin N/A, thats a different story.
on a side note has anyone done a built 4.8? at least forged rods and pistons? crank failures seem to be very rare but callies does make some shorter stroke ones that come up on ebay once in a while
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07-15-2010, 09:20 PM
#8
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no reason to uprade the internals anytime soon. i was around 800rwhp for quite awhile in my 4.8 on the street and had no issues at 7500 rpms every single shift
however a thought of mine is 4.8 stroke with LS1 bore for a 310 cube motor that can spool a larger turbo easiler and have same rpm capabilites
however a thought of mine is 4.8 stroke with LS1 bore for a 310 cube motor that can spool a larger turbo easiler and have same rpm capabilites
07-15-2010, 09:46 PM
#9
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Keep the 4.8 block and pistons, buy a cheap 5.3 crank and rods then you will have a stout little flat-top 5.3. Will be around 10.3:1 CR vs standard 5.3 9.5:1 CR.
07-15-2010, 09:54 PM
#10
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(I know it wasnt my idea, just playing)