Hey everyone, OK I'm new to Buicks so I have a couple questions. My son just got a 67 skylark to fix up for his first car. It has a 340 4bbl engine in it. According to my books this is a 10.25 copmression engine. What is the best way to lower it down to around 9.00. Can a person swap later model heads? Dished pistons? Thanks in advance Rick
The 340 was only made in 1966 and 1967, which limits your choices for replacement parts. The compression is 10.25:1 in the 4-bbl engines and 9.0:1 in the 2-bbl engines. The pistons are the difference. When I finally rebuild mine, I will use 9.0:1 pistons to avoid the pinging problem which I now have to use a racing fuel mix to overcome.
