85 Delta engine swap

whizkid88 · February 24th, 2009, 09:07 PM

Will a 455 slip right into the mounts from the old 307?

J-(Chicago) · February 25th, 2009, 03:43 AM

You bet your ass they will. Bolt some 307 motor mounts to the 455 block, and you're good to go.

Big block headers for 73-76 cutlass will bolt in too if you remove the front frame braces. you will have to dimple them 1/4'' by the lower control arms and grind off the bottom firewall lip.

whizkid88 · February 25th, 2009, 06:10 PM

Thanks man. I would also like to know what I have to do to the crossmember to put a 350 or a 400 tranny behind it.

J-(Chicago) · February 25th, 2009, 08:30 PM

If you have a 200c metric transmission without overdrive, a short tailed th350 is a direct swap. You will just have to add a metal vacuum line for the modulator.

J-(Chicago) · February 25th, 2009, 08:49 PM

Also, I noticed that your sig says you have a royale, and not a royale brougham.
If your car is a 2 door royale, there were only 15,002 made in 85'.
The 2door royale broughams were 31,891.
4dr royale--69641
4dr royale brougham--102,342

If you have the overdrive trans, you will have to get the crossmember from a 200c car to use with the th350

if you want to use a th400, you will need driveshaft modifications. Th400 uses 32 splines, instead of 27

whizkid88 · February 26th, 2009, 05:01 PM

Yes, it happens to be a 2 door coupe and it has the 200c w/ overdrive.
Is there any way to get around getting a new crossmember?
And actually this car is one of the first built in 85.

J-(Chicago) · February 26th, 2009, 06:00 PM

200c does not have overdrive.

2004R is the overdrive trans.

If you have the 2004R, you will need to go get a different X member from a non overdrive 80-85 Lesabre, or Delta 88.

whizkid88 · February 26th, 2009, 06:36 PM

Ok I will see if i can find one. Oh I cant wait until i get the new engine and tranny.

Olds64 · February 26th, 2009, 08:20 PM

You might also consider building the 200 4R you have. It will bolt up to your 455 but will tank the first time you step on it unless you build it.

joe_padavano · February 26th, 2009, 08:45 PM

Quote:

Originally Posted by J-(Chicago)

If you have the 2004R, you will need to go get a different X member from a non overdrive 80-85 Lesabre, or Delta 88.

Or, you can use the crossmember you have with a TH400. The mount location for a short tailshaft TH400 is in the same location as on the 200-4R. You will need a shortened driveshaft with the correct front yoke.

easytobedead · February 26th, 2009, 09:18 PM

Quote:

Originally Posted by J-(Chicago)

Also, I noticed that your sig says you have a royale, and not a royale brougham.
If your car is a 2 door royale, there were only 15,002 made in 85'.
The 2door royale broughams were 31,891.
4dr royale--69641
4dr royale brougham--102,342

If you have the overdrive trans, you will have to get the crossmember from a 200c car to use with the th350

if you want to use a th400, you will need driveshaft modifications. Th400 uses 32 splines, instead of 27

thats some good info!

February 24th, 2009, 09:07 PM	#1 (permalink)
whizkid88 Registered User Join Date: Jun 2008 Posts: 10	85 Delta engine swap Will a 455 slip right into the mounts from the old 307? __________________ '85 Delta 88 Royale

February 25th, 2009, 03:43 AM	#2 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	You bet your ass they will. Bolt some 307 motor mounts to the 455 block, and you're good to go. Big block headers for 73-76 cutlass will bolt in too if you remove the front frame braces. you will have to dimple them 1/4'' by the lower control arms and grind off the bottom firewall lip. __________________ I'd rather have a numbers matching poker hand.

February 25th, 2009, 06:10 PM	#3 (permalink)
whizkid88 Registered User Join Date: Jun 2008 Posts: 10	Thanks man. I would also like to know what I have to do to the crossmember to put a 350 or a 400 tranny behind it. __________________ '85 Delta 88 Royale

February 25th, 2009, 08:30 PM	#4 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	If you have a 200c metric transmission without overdrive, a short tailed th350 is a direct swap. You will just have to add a metal vacuum line for the modulator. __________________ I'd rather have a numbers matching poker hand.

February 25th, 2009, 08:49 PM	#5 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	Also, I noticed that your sig says you have a royale, and not a royale brougham. If your car is a 2 door royale, there were only 15,002 made in 85'. The 2door royale broughams were 31,891. 4dr royale--69641 4dr royale brougham--102,342 If you have the overdrive trans, you will have to get the crossmember from a 200c car to use with the th350 if you want to use a th400, you will need driveshaft modifications. Th400 uses 32 splines, instead of 27 __________________ I'd rather have a numbers matching poker hand.

February 26th, 2009, 05:01 PM	#6 (permalink)
whizkid88 Registered User Join Date: Jun 2008 Posts: 10	Yes, it happens to be a 2 door coupe and it has the 200c w/ overdrive. Is there any way to get around getting a new crossmember? And actually this car is one of the first built in 85. __________________ '85 Delta 88 Royale

February 26th, 2009, 06:00 PM	#7 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	200c does not have overdrive. 2004R is the overdrive trans. If you have the 2004R, you will need to go get a different X member from a non overdrive 80-85 Lesabre, or Delta 88. __________________ I'd rather have a numbers matching poker hand.

February 26th, 2009, 06:36 PM	#8 (permalink)
whizkid88 Registered User Join Date: Jun 2008 Posts: 10	Ok I will see if i can find one. Oh I cant wait until i get the new engine and tranny. __________________ '85 Delta 88 Royale

February 26th, 2009, 08:20 PM	#9 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,286	You might also consider building the 200 4R you have. It will bolt up to your 455 but will tank the first time you step on it unless you build it. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

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