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Pontiac of the Month

Rayz571's 1977 Can Am

2020 June
of the Month

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1963 Grand Prix

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So I bought my Grand Prix almost a year ago. When I bought her the fella told me that she hadn't been started in around 9yrs. After having her hauled home and changing fluids & plugs she cranked but still wound start. After replacing the regulator, adjusting he carb & some general tinkering she fired up. After running for a few minutes I noticed a sound in the bottom end and shut her down. I was told the engine was a 421HO and knowing nothing about Pontiacs at the time I didn't know if that was a good thing or not. I spent the next couple days researching what I thought I had and listening to all the reasons why I needed to do an LS swap from the local guys. I finally decided to just rebuild what I thought and was told was the original engine. So I pulled the motor, tore it down and took it to the machine shop. I told the owner the story and what I thought I had and asked him if he could possibly double check for me before I started ordering parts. I got a call a few days later telling me that yes I had a 421ci motor and to start ordering parts, and I did 😀. A couple weeks go by and I get a call telling me that "we've ordered the wrong piston's". I was then told that the machinist made a mistake, he didn't measure the blocks bore he just ran the block number which came back as a 421. He continued to tell me that I had a 428 and the reason for the mistake was really not their fault, that Pontiac used left over 421 blocks to make the 428 and that's why they had a 421 part number. (Totally false). After talking to the place where I ordered the pistons they agreed to exchange them with a $50.00 restocking fee. The machine shop offered to ship them for me to save me an hour drive back to their shop. Then I get a call from the piston company telling me the pistons they got back were damaged and not in the original box. After getting pictures and looking at the video they sent me (they record the opening of all returns) it was obvious there was little packing between the pistons and they got beat all to hell. 2 weeks Later I dropped off my new pistons and rings. Almost 3 months later I pick up the engine and heads. Total time, just over 4 months on an engine that I dropped off to have cleaned up, bored 30, crank redone and parts cleaned and prepped for me to build. Anyways I've got the rebuild done and the motor back in the car and she sounds great.  





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