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I'm waiting for someone who might know too. I learned earlier that there may be limitations to how much lift you can run with the stock springs on the 88. Check out andrewsproducts.com. It looks like the 21G or 26G might be a good fit.
 
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I had a 01 RG,i put the SE 211 cams in it it had 508 lift,thunderheader,had the heads ported left stock valves and stock springs in it with 10.1/4 to 1 95 inch pistons,with Magnetii fuel injection with a power commander never could remove a small hiccup in it,so i switched it to a 42 mikiuni this motor made 100 hp and 105 torque,but with that said the 211 cam didnt come on till 2200 rpm but i loved the way this bike ran.Just check cam manufactures the will say if it is a drop in cam with noe head work required,generaly no more 515 lift on a early TC.but there are others on here who are know more about this than me.A SE 204 cam would be good or any other cam in the same lift and duration size as the 204.
 

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203's seem prevalent, 01-03 heads are said to flow
better, that's why many bore to 95" for the tq and went
Hookers or Thunder 2in1, many with stock cam
 

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S&s cams

HERE ARE THE SPECS FOR S&S CAMS SOME WOULD FIT YOUR APLICATION

1999-Up
HP103: For the rider who really wants the most top end horsepower. Easily make 100 horses from a stock engine with S&S intake and exhaust. Ideal for lighter bikes and racing applications where getting the most horsepower from a stock engine is imperative.

MR103: These bolt in-cams are for the rider who wants more of everything without giving up low end torque for high rpm horsepower, or vice versa. More power all across the wide power band, from idle to red line.

475: A bolt-in replacement cam designed for riders with stock engines that want to eliminate the factory chain drive system, but are not necessarily looking for more power. Does not require tuning. Bolt-in stock.

509: Designed as a bolt-in, high torque cam for 1999-'06 models. 180 psi cranking compression, no need for compression releases. For 88 CID engines with stock compression ratio. Idle-4500 rpm. Bolt-in torque.

510: Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1, it is primarily intended for use with stock, un-ported heads. 3000-5500 rpm. Bolt-in overall.

551: Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression. This is a bolt-in cam set designed for stock or mildly modified touring bikes. 551 cams are not recommended for compression ratios of 10:1 or greater. Greatly improves low-end and midrange torque, strongest from idle-4000rpm.

557: Designed for Tri-Glide® models, this bolt-in cam, with it’s short duration, produces lots of useable torque. The camshaft’s stock base circle permits the use of stock pushrods. However, we recommend S&S Quickee pushrods for easy installation. 557 camshafts are available in chain or gear driven versions. Both come with our Easy Start automatic compression release feature for quick starts. Fits all 2009-2012 Harley-Davidson®Tri-Glide® models. Bolt-in.

570: Designed for 88 to 96 CID engines with compression ratios between 9:1 and 10:1 this cam will provide a nice power increase across the entire power band. 3200-5700 rpm. Excellent bolt-in for overall power on a 103". Bolt-in overall.

583: Optimized for use in the Softail®/Dyna® lines, this cam makes horsepower and torque that you can feel all the way through the rpm range, making the most power right where you need it:1500–5000rpm. Bolt-in.

585: Designed for 88 to 95 CID engines with compression ratios from 9.7:1 to 10.5:1 and 100 to 124 CID engines from 9:1 to 10:1 compression. Provides massive horsepower and torque increases starting at 3000rpm and holds steady all the way to redline. 3500-6000 rpm for 88" - 103" engines and 2500-5500 for larger engines.

625: Cam set designed for 95” or larger engines with compression ratios between 10.0 and 10.75:1. 3000-6000 rpm.
635HO: This is the cam set for the rider looking for maximum horsepower. With .635" lift, your engine can really breath. They’ll work even better when you have your cylinder heads CNC ported in Step 4. High lift S&S valve springs are required.

640: Used in S&S T124 engines, this cam makes horsepower! Intended for engines of 95 CID or more w/compression ratios between 10.5:1 and 11.5:1. 3000-6000 rpm.

675: A high lift monster, this cam set is designed for 120” or larger engines with at least 11:1 compression ratio. 4500-6500 rpm.
 
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