Quote:
Originally posted by 911sc79
Once exhaust has been replaced with SSI, what would be the next best improvement to a 79 SC? EFI or 20/21 cams?
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Anything more than SSIs (and a good dual-in-dual-out exhaust), may not be beneficial as far as cost goes. 20/21 is a nice upgrade, but very expensive as you might have to also do some valve and cylinder head work to comply with the higher lift of the 20/21s. Asking the same question as you, I've found that 20/21 cams, in most cases, is a poor upgrade unless you need to do other work on the engine - say, for example, a top-end job. There is some improvement with the upgrade, but for the money I've been quoted that this upgrade will cost, it's not worth it.
If by chance you need to split the case entirely, the consensus for more power suggests non-CIS pistons, more radical cams than 20/21s and a more direct injection system than CIS. This is where I would think about EFI.
Also, the displacement comment is a good one - a 3.2 short stroke with good cams and injection could easily see 250 hp. But by that point, unless you're emotionally attached to the 3.0, there's really no practical reason to not go up to a 3.6.
Meanwhile, more effective ways of modifying your motor is to not modify it and instead, modify what's around it. Put your car on a weight-training program, and think about slipping in a 7.31 ring and pinion in the transmission. As stands, with SSIs and exhaust, you probably have close to 200 hp. That 200 hp in a lightened SC with shorter gears will be quite rapid.