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HYBRID THEORY! Gen 4/5 LT1, LT4 and LS engine compatibility

 
Old 12-05-2018, 12:37 PM
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Default HYBRID THEORY! Gen 4/5 LT1, LT4 and LS engine compatibility

Thought this would pertain to the boosted guys, so I put it in this section. Put this video together to show that the stock GEN V LT1 crank and LT4 rods can work in a GEN 3/4 block.

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Old 12-05-2018, 01:07 PM
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Nice. Will watch later!

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Old 12-05-2018, 01:15 PM
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Not watching a half hour video... Why would you want the LT internals? LT stuff appears to be weaker then the Gen 4 internals judging from all the blown up LT engines I see at relatively low power. LT1 is good for what 750 maybe 800 for a little while, and LT4 is about done at 1000 some hang on for a few months at 1100. Doesn't seem worth it to me, but maybe I'm missing something as Gen 4 internals don't seem to give a **** about 1000hp for a few years and are significantly cheaper.
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Old 12-05-2018, 01:37 PM
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Watches video and jumps on eBay and starts shopping...
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Old 12-05-2018, 02:06 PM
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Originally Posted by SLOW SEDAN View Post
Not watching a half hour video... Why would you want the LT internals? LT stuff appears to be weaker then the Gen 4 internals judging from all the blown up LT engines I see at relatively low power. LT1 is good for what 750 maybe 800 for a little while, and LT4 is about done at 1000 some hang on for a few months at 1100. Doesn't seem worth it to me, but maybe I'm missing something as Gen 4 internals don't seem to give a **** about 1000hp for a few years and are significantly cheaper.
Mostly because I'm a cheap **** and wanted to find an upgrade over Gen 4 LS parts on the cheap, the rods were $180 and I think are comparable to a Callies I beam and the crank is factory forged that I paid $75 plus shipping for, I have no Idea how strong the LT blocks are, but it doesn't matter since I'm using a Aluminum 5.3 block anyways,
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Old 12-05-2018, 02:12 PM
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Originally Posted by Turbo D View Post
Mostly because I'm a cheap **** and wanted to find an upgrade over Gen 4 LS parts on the cheap, the rods were $180 and I think are comparable to a Callies I beam and the crank is factory forged that I paid $75 plus shipping for, I have no Idea how strong the LT blocks are, but it doesn't matter since I'm using a Aluminum 5.3 block anyways,
LOL Gotcha, be curious how it holds up. Whats the setup? Using better then stock heads?

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Old 12-05-2018, 10:27 PM
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It will have btr prepped trick flow 220's
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Old 12-06-2018, 11:32 AM
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Does this affect flywheel/flexplate?
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Old 12-06-2018, 12:21 PM
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Sort of. The LT1 stuff is 8 bolt like a LSA.
Internally balanced like most everything else though so no drama there like a SBC 400 back in the day if that's your concern.
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Old 12-06-2018, 12:53 PM
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thank you very much, I learned a bunch!
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Old 12-06-2018, 02:49 PM
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I can tell you a Gen 5 (L83) truck starter will bolt onto an LS, cranks pretty slowly though.
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Old 12-06-2018, 06:22 PM
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A set of junkyard dog pistons and youd have what seems to be a very solid rotator.
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Old 12-06-2018, 11:45 PM
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Great info, I've collected the same parts but haven't had time to confirm what you just did. You plan on using a stock lt1 harmonic balancer?
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Old 12-07-2018, 10:41 AM
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havent watched yet but i heard the issue with LT4s is that red coating you see for the main bearings starts to peel at high power levels and wipes out the bearings and thats why they explode.. my buddys shop has a customer wanting 1000 from his 17 zl1 with a procharger.. they are replacing the rods for this reason..
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Old 12-07-2018, 11:39 AM
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Originally Posted by 55superbeetle View Post
Great info, I've collected the same parts but haven't had time to confirm what you just did. You plan on using a stock lt1 harmonic balancer?
Iím going to use an sfi balancer with a keyway, you could use a lsa balancer also.
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Old 12-07-2018, 11:40 AM
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Originally Posted by dan.b View Post
havent watched yet but i heard the issue with LT4s is that red coating you see for the main bearings starts to peel at high power levels and wipes out the bearings and thats why they explode.. my buddys shop has a customer wanting 1000 from his 17 zl1 with a procharger.. they are replacing the rods for this reason..
Good to know.
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Old 12-07-2018, 12:02 PM
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Originally Posted by dan.b View Post
havent watched yet but i heard the issue with LT4s is that red coating you see for the main bearings starts to peel at high power levels and wipes out the bearings and thats why they explode.. my buddys shop has a customer wanting 1000 from his 17 zl1 with a procharger.. they are replacing the rods for this reason..
Same, seen a bunch of LT4's all around that 1000 mark have bearing issues.

Originally Posted by Turbo D View Post
It will have btr prepped trick flow 220's
Good stuff, curious how it all works out. Crank doesn't work for me as I don't want to buy a new clutch but it's cool to see the comparison.
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Old 12-07-2018, 05:40 PM
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could you use just the rods on an LS crank?
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Old 12-08-2018, 01:28 AM
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^^^^^^was wondering the same thing^^^^^^
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Old 12-08-2018, 03:26 AM
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Originally Posted by Kfxguy View Post
could you use just the rods on an LS crank?
Quote
I will have to do a mock up on a LS crank and see if the "strut" on the small end clears the counterweight.
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