LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

Hooker P/N: 12621HKR mounts

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Old May 14, 2013 | 08:32 AM
  #1  
utfan01ss's Avatar
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From: Chickamauga, GA
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
Hooker P/N: 12621HKR mounts

Anyone use these Hooker LS swap motor mounts on their conversion? Tennessee Speed Sport told me about them, said I wouldn't have to change my frame mounts with these Hooker swap mounts. Evidently they bolt to the LS block and act as a clamshell.

Just curious if they work and align the drivetrain properly. Meaning if I use a Spohn T-56 crossmember it'll line up without any issues.
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Old May 21, 2013 | 06:02 PM
  #2  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
http://www.holley.com/data/Products/...564rev1%20.pdf

12621HKR (MOVES TRANSMISSION 1.25” FORWARD AND .5” UP FROM STOCK LOCATION)

NOTE: This 12621HKR engine swap mount kit is designed to locate a GEN III/IV (LS Based) engine so that the transmission bellhousing is located 1.25” forward from its original position when installed with a standard small block Chevy engine using stock clamshell style mounts.
NOTE: Due to the engineered raising of the engine by .5”, the rear pinion angle may need to be modified if increased drivetrain vibration is experienced after installation.


I don't think that's what you want.
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Old May 25, 2013 | 11:45 AM
  #3  
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From: Pepperell, MA
Car: 1987 Trans Am
Engine: LQ9/L92
Transmission: 4L60E
Re: Hooker P/N: 12621HKR mounts

Just grab some of the 1" setback plates that various vendors sell. allows you to reuse the upper and lower mount pieces and puts the engine in the correct positioning for trans/driveshaft
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Old Sep 7, 2015 | 05:17 PM
  #4  
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From: Quebec
Car: 1988 Trans Am
Engine: 6.0L LY6 (Vortech Supercharged)
Transmission: Tick Performance T-56
Axle/Gears: 3.42
Re: Hooker P/N: 12621HKR mounts

Originally Posted by five7kid
http://www.holley.com/data/Products/...564rev1%20.pdf

12621HKR (MOVES TRANSMISSION 1.25” FORWARD AND .5” UP FROM STOCK LOCATION)

NOTE: This 12621HKR engine swap mount kit is designed to locate a GEN III/IV (LS Based) engine so that the transmission bellhousing is located 1.25” forward from its original position when installed with a standard small block Chevy engine using stock clamshell style mounts.
NOTE: Due to the engineered raising of the engine by .5”, the rear pinion angle may need to be modified if increased drivetrain vibration is experienced after installation.


I don't think that's what you want.
If you swap sides it does the opposite...

IE moves the engine 1.25" back
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