I was wondering if anyone had the statistics on the Caprice compression ratios for '86 to '93 for the police package 350. I know the compression ratio of the '94 to '96 LT1 was 10.5:1 but I cannot find the ratio for any other year (pre-LT1, so it would be the L05). Any help would be appreciated.

You need to buy the book Chevrolet Police Cars by Edwin J Sanow.

89 was 9.3
90 was 9.8

Thanks for the info. Is this book readily available or will I have to hunt for it? I've really been interested in finding any materials on police package Caprices. What is included in the book?

It covers everything from 1955-1996. It gives some specs and give Michigan State Police tests for some of the years for all makes tested.

Amazon.com carries the book.

how bout a 91 motor??

Does Anybody Know The Compression Ratio For The Pre Tbi 9c1 Caprice ? '88 And Older 350 ?????

You can find specifications on '90 and earlier Caprices here:

http://www.geocities.com/onamarie.geo/chevy.html

Look on the left side of the page and you may have to scroll down. It has the specifications for 1977 through 1990.