Lt1 in 78 malibu

[Supercharged111]

Just wanted to correct myself, for anyone in the future who uses this thread for their build research. I read the info wrong and it turns out LT1 is infact a 153 tooth. Lots of misleading info online (regarding sbc flywheels) I bought both an LT1 flywheel and a Post-86 flywheel and they have the same bolt pattern and both are weighted but the LT1 is more of a "deep dish" on the engine side whereas the Gen I flywheel is flat. My motor is on the stand so I cant really determine why just yet but long story short, they are different. I believe also the LT1 pistons are lighter than the Gen I pistons therefore creating different balancing requirements. I was tempted to try and fit the Gen I piece as it is definitely lighter but I am going to play it safe and use the intended flywheel.

There is also early and late LT1, late I believe had the powdered metal rods or whatever the new hotness was. I want to say that was 95-97.

 

[Baker7888]

There is also early and late LT1, late I believe had the powdered metal rods or whatever the new hotness was. I want to say that was 95-97.

Yes. That and vented opti spark

 

[Baker7888]

Ok, yet another curveball to this operation. Hopefully somebody has run into this.

I bought both the Gen 1 and Gen II 1 pc RMS flywheel. They have the same mounting pattern, both engine and clutch, the weight *looks to be the same. The LT1 flywheel is like an inch or more TALLER than the Gen I flywheel. That is, they are the same on the engine side, but on the clutch side the LT1 flywheel is dished out an inch or more. See pics. Now I am wondering if this is specifically needed for the T56 and if/how it will affect anything with mounting to my T10

You can see in the pics the flywheel with the "deep dish" is the LT1

 

[Supercharged111]

My guess is it's transmission specific, don't forget about the pull style hydraulics in the LT1 T56. I can't speak to the balancing.

 

[Baker7888]

My guess is it's transmission specific, don't forget about the pull style hydraulics in the LT1 T56. I can't speak to the balancing.

Thanks. I think i need to use the Gen I flywheel. The weights look the same so i should be OK.