I need to buy a flexplate for my internaly balanced lt1 with the stock converter bolt pattern. What is the bolt pattern on the stock converter. 10.5, 10.75? I was thinking the jegs 60153 would be nice if it would fit.

 

Wrong one.
1986-1997 can only mean Gen 1 blocks since LT1 was intruduced in 1992 = Gen II.
Probably foor a 2-piece rear main seal.
Plus the top of the part number you listed:
Chevy, Externally Balanced
555-60153
Heavy Duty Flexplate
SB-Chevy 1986-97
153-Tooth
Small Bolt Pattern (10.75'')
___________________________________________
I have what you need, 30 seconds of running time and removed,
I needed external balance - it's brand new!
Chevrolet SFI-Approved Flexplates
TCI
890-399174 $73.99
SFI-Approved Flexplate
SB-Chevy LT1
Internal Balance
Small Bolt Pattern
153 Tooth
It's in the box just sitting here -
pm me for my low shipped price - happy to help you out!

 

So the TCI 890-399174 will fit a stock converter bolt pattern and the lt1 engine? Will it work with an internaly balanced engine? ( It does not have weights on it right)

 

399174 is the tci number you need for internally balanced LT1

 

sounds good. will it fit the stock bolt pattern on the converter?

 

yes - but only the stock (small) pattern converters.