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Old 02-05-2004, 09:25 PM
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55 chevy 4 door 350/350 swap?

Hello guys,

I am new to tri 5's, I recently bought a 55 2 dr post and then found a 55 chevy 4 dr that i was going to buy for a parts car.

After seeing how clean this 4 dr car is I do not have the heart to tear it apart as it is so complete and clean.

It has the original inline 6 and 3 speed on the column. It still runs but seems liek its going to need a rebuild.

What is involved in swapping over to a small block/350 combo?

Is this the way I should go?

Any help is greatly appreciated. Thanks

John

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Old 02-05-2004, 09:35 PM
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the 50`s line chevrolets came with mounts on the front of the block, every small block still has these same mounting holes in the front of the block, so just get mounts for a 55 Chevy with a V8.
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Old 02-06-2004, 09:32 AM
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Speedway as everything you need for the change over.

Are you going to use an auto trans? If so get the rear side motor mounts they are easier to work with also the radiator on a 6 cylinder is in front of the core support and the V8's are behind the core support, the tri 5's don't use shrouds so the fan needs to be two inches from the radiator don't use a clutch fan use a good flex fan. Instead of trying to find stock exhaust manifolds get a Jeg's catalog go to headers and under 55-57 the patriot's are the only ones to have pn#737-H8025 $199.00 are the black ones and the pn#737-H8025-1 $299.00 are the ceramic coated ones. The $100.00 difference is well worth it. Have fun with it!
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Old 02-06-2004, 10:05 AM
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so if i understand you guys correctly there are 3 types of v8 motor mounts? front mounts, side mounts and rear side mounts? and the easiest to work with is the rear side mounts? and these are aftermarket ones i order online? and my factory trans crossmember will work?
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Old 02-06-2004, 01:37 PM
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Tri-fives use two front mounts and two bell housing frame mounts. To use the 350-350 set up you can go a couple ways. You can use the existing front 2 mounts on the engine and buy aftermarket mounting kit, and bolt the trans to the existing rear mount and use a crossmember. Or you can buy the frame mounted side kits and use a crossmember. The side mount kits vary from supplier to supplier. If you go this route check to see if you have a two-piece or seamless frame. you can use the existing radiator in the 6 cylinder place and use the long water pump to get you closer to the radiator. They make spacer assemblies to go between fan and water pump to also get closer. In my opinion a good 7 blade solid fan works better than a flex fan. Hope this helps.
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Old 02-06-2004, 01:41 PM
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thanks for the info, sorry if this sounds lame, but how do i tell if i have a two-piece or seamless frame?
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Old 02-06-2004, 01:44 PM
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An added note.....

Don't just use the front mounts and put in a crossmember at the back of the trans. It's too long a span. Your engine and tranny will flex too much, causing the tranny bell housing to crack.

Some people have gone this route and gotten away with it, but it's not recommended.

I have heard that there is a bracket to strengthen this area, but I havn't seen it. Maybe someone else knows of this.
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