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Generation IV Internal Engine
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Looking for 4.125 Bore

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Old 03-08-2012, 09:48 PM   #1
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Default Looking for 4.125 Bore

What is the most cost effective way to get a block with big bore sleeves? I've been wanting to build a forged LS3 bottom end but am wondering if it would be worth it ($$) to start with a big bore. What are my options?
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Old 03-08-2012, 11:03 PM   #2
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You can use a GM LSX block, a sleeved aluminum block, or an after market block. The cheapest will either be the LSX block or sleeved LS1 block.
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Old 03-09-2012, 06:53 PM   #3
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If you already have a LS3 block, dry sleeves are your cheapest option. If you have a LS1 block, only option is wet sleeves - more money but stronger build.

Take a look at ERL's website - many options to work from.

Least expensive option really depends on what you have on hand. If you have a complete LS1 engine, covers etc it will be less overall to wet sleeve this versus buying new LS2/3 block, covers etc and dry sleeving. Short block is one thing - 4.125 bore opens up a lot of great but expensive head options. Overall a fantastic engine can be built but it will be costly to complete. Need to ask yourself if the gains over 408 are worth the cash you will have to pay.
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Old 03-09-2012, 09:13 PM   #4
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Or pick up a LS7. I sold my LS7 shortblock for $3500.
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Old 03-10-2012, 03:49 PM   #5
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Quote:
Originally Posted by COPO9560 View Post
If you already have a LS3 block, dry sleeves are your cheapest option. If you have a LS1 block, only option is wet sleeves - more money but stronger build.

Take a look at ERL's website - many options to work from.

Least expensive option really depends on what you have on hand. If you have a complete LS1 engine, covers etc it will be less overall to wet sleeve this versus buying new LS2/3 block, covers etc and dry sleeving. Short block is one thing - 4.125 bore opens up a lot of great but expensive head options. Overall a fantastic engine can be built but it will be costly to complete. Need to ask yourself if the gains over 408 are worth the cash you will have to pay.

I do not have a block yet. I was planning to go LS3 but I really wanted to maximize cubic inches with out running a long stroke. The LS7 block is way too much $ for me.

I've seen some aluminum 5.3 blocks for sale on Ebay cheap. Not sure if they would be a good candidate. What is the max bore size on the 6.2 block using wxisting sleeves?
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Old 03-10-2012, 06:37 PM   #6
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You can go to 4.185 on dry sleeved LS3 block. You might contact a couple guys about installing sleeves, 5.3's are candidates here as well.
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Old 03-10-2012, 06:37 PM
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