Conversion - Mercedes-Benz Forum
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post #1 of 65 (permalink) Old 05-29-2019, 07:00 AM Thread Starter
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Date registered: May 2019
Vehicle: 73 450sl with SBC motor and trans
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Conversion

I have a 73 450sl that I have been driving and working on for over 10 years. I decided to replace the motor and trans last year because the time spent working on it and driving it was getting lopsided. I am converting to a SMC 350 and Turbo 400 trans. It is in progress now and has been a lot of work but I am on the downhill side and should be ready for a test start soon. This was a hard decision to make but my family mechanic that has been working on our cars for the past 40 years has retired and there is no one in my area that wants to work on this generation. If anyone has any questions on the process so far feel free to ask.
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post #2 of 65 (permalink) Old 05-29-2019, 08:00 PM
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Pictures please . . .

Brad Cushman
73 450 SL
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post #3 of 65 (permalink) Old 05-30-2019, 11:17 AM Thread Starter
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https://www.benzworld.org/forums/att...516990&thumb=1
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post #4 of 65 (permalink) Old 05-30-2019, 02:31 PM
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Vehicle: 1986 560SL with M120 V12 Engine, 1988 560SL Stock
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Is that a custom front sump pan I see. If I recall there were come Chevy's with front sump pans, have you tried any of those.

Are those engine mounts going to bolt directly to the 107 rubber mounts.

Good luck with it.
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post #5 of 65 (permalink) Old 06-02-2019, 11:07 AM
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id be curious to know what exhaust manifold/headers you find to fit it
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post #6 of 65 (permalink) Old 06-02-2019, 02:53 PM
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You know I really have no problem with Chevy conversions, after all Samson did start out as one and I did a Chevy conversion on a Ferrari 308.

But to me there really is only one reason to actually do the Chevy conversion.

TREMEC T-56 Magnum GM 6 speed Transmission, 2.97 first

Just Saying.
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post #7 of 65 (permalink) Old 06-02-2019, 08:29 PM
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Quote:
Originally Posted by roncallo View Post
You know I really have no problem with Chevy conversions, after all Samson did start out as one and I did a Chevy conversion on a Ferrari 308.

But to me there really is only one reason to actually do the Chevy conversion.

TREMEC T-56 Magnum GM 6 speed Transmission, 2.97 first

Just Saying.
one of a handfull of reasons, waiting for the new F version of that to hit the market for my build, weve actualy been put on "the list" for one
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post #8 of 65 (permalink) Old 06-03-2019, 07:30 AM Thread Starter
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Date registered: May 2019
Vehicle: 73 450sl with SBC motor and trans
Location: Ithaca NY
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The motor I have is a 1988 SBC 4 bolt main out of a G30 motor home with 30k miles on it. The manifolds I ordered online and they are for a Chevy/GMC truck. The manifold gaskets and the flanges were a internet challenge to find as well. The passenger side followed the same exhaust line as the original but there is no room on the driver side get by the power steering box. I had to dump out the front and run the exhaust under the K member. It is tucked up and should not change ground clearance. I did use 2.5 pipe kit to make the new system with a Y pipe to join and then single to muffler. No resonator. I am using a Thrush welded muffler and based on the sounds available on their website it should sound good and not to muscle car. If the pic appears you can see the routing. I am test fitting the alt and power steering to make the brackets now.
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post #9 of 65 (permalink) Old 06-03-2019, 09:22 AM
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Greetings from sunny socal. That build looks great!

I went to school in Ithaca . You didn't purchase an 85 300D turbo from a graduating senior back in 2012 did you?
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post #10 of 65 (permalink) Old 06-03-2019, 10:09 AM Thread Starter
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Date registered: May 2019
Vehicle: 73 450sl with SBC motor and trans
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SoCal,

I did not purchase a 300D but it is a great car my Mom had a few. The 73 450sl is the only one I have. I go out to Woodside Ca every summer to ride my bike. I really enjoy the area and have stopped at a few car shops to gather info on conversions.

Steve
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