Older Chevy V-8 conversion in 108 - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 08-01-2013, 05:25 PM Thread Starter
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Date registered: Feb 2006
Vehicle: '92 400E 5.0; '91 500; '98 CL600; '92 300D, 2.5; 1965 250S, SBC V8
Location: Charleston, SC
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Question Older Chevy V-8 conversion in 108

While driving through Hampstead NC, spotted a 108 with CBC V-8 painted on windshield with white shoe polish. Turns out car is a 250S. Vin is bad. Title reads 108 101212055653. It has a 283 with a 2 speed powerglide. The cnter section of the subframe was cut and reversed. Drag link is custom as is the idler bracket. It has an A-6 GM a/c compressor, and the factory (GM) alt. and P/S pump. Body was probably green origionally, was white or silver at some time and is now flat black. Has the usual rust issues at the front of the rockers but 3 of 4 windows work as do the lights, hazards, and A/C. Does anyone outthere know who might have done the conversion? I would guess at least 10 years ago plus. I plan to do a rat-rod type of clean up on it. The interior is pretty good, needs a windshield (delaminated) and all seals. BTW, paid 1K. Any info would be appreciated.
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post #2 of 5 (permalink) Old 08-01-2013, 05:40 PM
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Pictures?



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post #3 of 5 (permalink) Old 08-02-2013, 08:52 AM
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Amrstar,

There's another GM transmission that you might find interesting. It's the 2004R, a 4-speed automatic with overdrive and a converter that locks up in overdrive. It's really compact and actually replaces a TH350 with no driveshaft modifications. I don't know anything about powerglides except that drag racers like them.

The overdrive ratio of the 2004R is .67.

Ray W
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post #4 of 5 (permalink) Old 08-02-2013, 04:46 PM Thread Starter
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Date registered: Feb 2006
Vehicle: '92 400E 5.0; '91 500; '98 CL600; '92 300D, 2.5; 1965 250S, SBC V8
Location: Charleston, SC
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Will get some pictures out soon. Replacing all calipers, hoses, M/C. Rotors are ok. Tie rod end are bad but custom drag-link is ok for now. Would have to build one. Conversion guru was pretty talented, things he did bring a smile to my face. Not exactly how I would have done it but...Going to replace all tires with 215/75-14 to see if that will help with the factory rear gear ratio (4.23?) and the powerglide. Will probably be at 4k rpm at 60mph but the holeshot should be impressive. I do have a 6.3 rear axle and that may be the solution down the road. Appreciate the tip on the 2004R tranny. Only paid 1K for the car and heard that drag guys are paying that for a good powerglide. Help me find the guy that did the origional conversion!!
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post #5 of 5 (permalink) Old 08-02-2013, 05:08 PM
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Amrstar,

This roadster came to me with a small block Chevy engine, TH350 trans and 2.79 rear gears. Cosmetically it was fine and saved me 10 years of build time but a worn out engine with unknown internals, 3-speed trans and Bonneville salt flats gearing didn't work for me.

I built an engine from a 350 cid, 4-bolt, $100 core from the local Chevy dealer with all dimensions standard, a 200R4 from Bow Tie Overdrives and changed the rear axle ratio to 3.80. Now it's a lot more responsive to the gas pedal (as in pavement melting responsive) yet is revving at just a fast idle in OD at 65+while getting gas mileage in the 20-21 MPG range on the highway .

I've never liked automatic transmissions but this one changed my mind. Maybe it an age thing since I'm 68 now.

Ray W
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