GEN V LT1/ LT4 cylinder head differences
Drifting
Joined: Feb 2001
Posts: 1,768
Likes: 297
From: Plano TX
:thumb:
Drifting
Joined: Apr 2015
Posts: 1,276
Likes: 317
With all due respect, one can use the lt1 intake on the lt4 by drilling/tapping the heads. Not so much the other way around...or maybe so. I have not that done.
Last edited by JHEBERT; Apr 25, 2018 at 10:26 PM.
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Melting Slicks
Joined: Sep 2002
Posts: 3,064
Likes: 95
From: MI
Researching swapping LT4 longblock into L86 truck with whipple 2.9. Adapter plats will add ~ 50mm, until yesterday disnt even consider potential head height difference...only so much clearance between blower and rear cowl.
Last edited by Earl H; Apr 26, 2018 at 06:26 AM.
2nd Gear
Joined: Jun 2018
Posts: 2
Likes: 0
Seeing that they have different bolt patterns unless you plan on drilling & threading them...? They seem to have the same casting...
Safety Car
Joined: Jan 2008
Posts: 4,071
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From: springfield mo
Heel & Toe
Joined: Apr 2015
Posts: 19
Likes: 12
The current standing mile record car is running LT4 heads without adapters. They did however tap the LT4 heads for the LT1 intake pattern. This was after they found the ported heads had been taken too far by the previous builder and had developed cracks.
Melting Slicks
Joined: Oct 2009
Posts: 2,560
Likes: 485
From: Moberly, Mo
The Lt1/4 are the same block. I don't think there is a big advantage to the Lt4 heads. I'm sure the additional bolt is just added because of boost, but thats a guess. I ran up to 20 lbs of boost on my Lt1 heads and never lifted the heads, some are running more boost then that.
Last edited by 99vetteran; Dec 10, 2020 at 07:40 AM.
Instructor
Joined: Sep 2016
Posts: 207
Likes: 34
One benefit of the LT4 heads are the titanium intake valves and when running a supercharger, the lower compression ratio can help as well. Furthermore the LT4 head is somewhat more HD, if that is required, I don`t know.
Last edited by goec2468; Dec 16, 2020 at 08:11 PM.
Melting Slicks
Joined: Oct 2009
Posts: 2,560
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From: Moberly, Mo