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225 Build - Compression ratio and camshaft suggestions?
https://www.slantsix.org/forum/viewtopic.php?t=68369		 Page 2 of 2
Author:  volaredon [ Sat Oct 04, 2025 6:36 am ]
Post subject:  Re: 225 Build - Compression ratio and camshaft suggestions?
Yup I got burned by the shorter replacement pistons thing. Had no idea til I measured once my short block was already back together. I took a wild ass guess as to how much to mill the block and with 0.030 off the block deck my pistons are still 0.180 down
... With an additional 0.070 off the head my engine measured out exactly 8.4:1 when done. Exactly blueprint spec. I was hoping at the time that with making 0.100" of cast iron dust by milling that it would get me to 9:1 or even slightly more. Goes to show how dismal it would have been if id have just bolted it together without any milling.
I have a long drawn out thread about my build in here somewhere from about 4 years ago
mine is also a forged crank block but with a newer peanut plug head so I could eliminate 6 potential oil leaks ( o rings on spark plug tubes) my build is also in a 1/2 ton truck, I built with very similar goals as you appear to want
Author:  SlantSixDan [ Sat Oct 04, 2025 3:56 pm ]
Post subject:  Re: 225 Build - Compression ratio and camshaft suggestions?
Quote:
being a non automotive engine it would be interesting to know if it has a shot peened crank and exhaust valve seat inserts.
The 225-1 and 225-2 HD and XHD truck engines, put into much heavier-duty service than the industrial/agricultural applications, had shot-peened cranks and other upgrades. Valve seat inserts weren't on the list. Here're the '66, '70, '74, '75, and '78 225-1 and 225-2 upgrades:
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