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Old Oct 27, 2016 | 04:20 PM
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Default 5.3 differences
How much difference in strength is tbere between the gen3 and 4 5.3? I've tried searching this on here but really can't get any true facts
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Old Oct 27, 2016 | 04:38 PM
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Originally Posted by cbra-klla
How much difference in strength is tbere between the gen3 and 4 5.3? I've tried searching this on here but really can't get any true facts

Keep the RPM's under 6600RPM for both and I'm going to say about 250 HP difference in strength holding capacity.


Eddie
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Old Oct 28, 2016 | 10:33 AM
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i just picked up a gen 4, the rods are very noticeably beefier!
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Old Oct 29, 2016 | 09:03 AM
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Default GEN-III/GEN-IV block strength
MY observation :

1. The block that has two different length "long" head bolts is weaker as stated by GM.
2. The block that has a breather "hole" between the main/cam tunnel is VERY weak AND will crack in that area.
3. The boss area needed to fit a Timing Chain "Idler" is not on many early blocks that when fitted will GREATLY increase chain life after being installed.

Lance
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Old Oct 31, 2016 | 07:11 AM
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Originally Posted by Pantera EFI
MY observation :

1. The block that has two different length "long" head bolts is weaker as stated by GM.
2. The block that has a breather "hole" between the main/cam tunnel is VERY weak AND will crack in that area.
3. The boss area needed to fit a Timing Chain "Idler" is not on many early blocks that when fitted will GREATLY increase chain life after being installed.

Lance
so are you referring to the gen III or IV as being weaker? because ive yet to hear of either of your first 2 points about a Gen IV
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Old Oct 31, 2016 | 07:21 AM
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Originally Posted by EddieGoesFast
Keep the RPM's under 6600RPM for both and I'm going to say about 250 HP difference in strength holding capacity.


Eddie
I'd say closer to 400.
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Old Oct 31, 2016 | 09:06 AM
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Originally Posted by JoeNova
I'd say closer to 400.
considering the gen 3 has proven to take so much abuse already, thats very encouraging for the fact that i just bought a Gen4 lol
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Old Oct 31, 2016 | 09:10 AM
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Someone just broke the stock bottom end chassis dyno record in the last few days. 11xx whp on a stock 5.3. Its already proven itself in the quarter mile laying down lots of low-mid 8s.
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Old Nov 3, 2016 | 05:47 PM
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So are all gen 4 motors have the 54x reluctor? Do you have to run a lingenfelter box to convert a gen 4 in an fbody?
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Old Nov 3, 2016 | 11:48 PM
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i believe ls2's and the lq motors still have the 24x wheel, other wise you either change the wheels or get the LPE converter like you mentioned
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