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You can only get so much power by advancing the timing. In fact that's one of the last things I'd do. Until 89 or so (the introduction of LH 2.4 and 3.1) the 240s had adjustable timing.
If you really want a lot more power, your best bet would be to find a turbo. Which in practical terms might mean a 700 series brick.
You didn't say whether or not you've got a manual transmission, but that would be a good start. As nic as the autoboxes are in the 240s, you do loose a fair bit of power. However, with an auto to manual transmission swap you're going to be cruising at higher RPMs down the highway.
If you have an automatic tranny, you can go for a higher stall speed torque converter which will help you off the line.
You could also replace the stock cam. I believe the B230F was featured with the M cam. A cam from an early 80s Canadian 240 (80-83 B23E) would be the K-grind (maybe H?), that's good for about 15 extra ponies. IPD sells a performance cam (VX3 grind I believe, which would sacrafice less low end power). If you're willing to shell out the bucks, you should talk to Mike Aaro at Unitek (over in Sweden). They've got the know how, and perhaps one of the best aftermarket cam choices.
Within reason, say 200 HP, I wouldn't be so concerned with wear and tear on the engines. Keep in mind that the 8 valve engines maxed out at 140hp (turbos about 180hp with turbo+, 162 without), and the 16 valver at about 150 (turbos about 200 hp). I don't know that there were enough 16 valve turbos to really evaluate the longevity (besides that the 16 valvers had some known serious issues).
If you're interested in more options, I suggest you take a look at some of the high performance Volvo groups like badbricks and turbobricks.
- alex
'85 244 Turbo
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