429/C6 engine swap
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429/C6 engine swap
Hi everyone I am in the process of swapping out the inline 6 with a 3 on the tree in my 2 wheel drive 1966 F250 and installing a 429 with a C6 trans out of a 1970 Mercury. Right now I am in the process of cleaning and replacing some parts. I have read in here that it's a pretty common swap but I have a few questions.
1. Can I use the stock motor mounts?
2. Can I use the stock trans mount?
3. What size radiator is recommended?
4. Will the V8 suspension springs be strong enough to handle the weight or go air bags? (As I wrote this question I think I might bag the whole truck)
1. Can I use the stock motor mounts?
2. Can I use the stock trans mount?
3. What size radiator is recommended?
4. Will the V8 suspension springs be strong enough to handle the weight or go air bags? (As I wrote this question I think I might bag the whole truck)
Logistics Pro
Joined: May 2015
Posts: 4,463
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From: Tri Cities, TN
This has been done many times and if you use the advanced search you will get back a bunch of stuff. My truck came with a 460/C6 but I removed it in favor of a 351C.
First you need the engine perches form a 70's truck that came with a 460.
The crossmember for the trans mount will work but you will most likely have to drill new holes in the frame.
The center crossmember is the big problem with a C6. You will have to remove the rivets and replace them with bolts so it can be removed to get the transmission in or out.
My truck just had the stock 352 size radiator the PO said it never got hot.
And you do realize that the compression on 1970 429's is 10.5 to 10.7-1 and it might not to be real happy with unleaded gas.
First you need the engine perches form a 70's truck that came with a 460.
The crossmember for the trans mount will work but you will most likely have to drill new holes in the frame.
The center crossmember is the big problem with a C6. You will have to remove the rivets and replace them with bolts so it can be removed to get the transmission in or out.
My truck just had the stock 352 size radiator the PO said it never got hot.
And you do realize that the compression on 1970 429's is 10.5 to 10.7-1 and it might not to be real happy with unleaded gas.
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When I did the compression test it was pretty high but it's just gonna be a fun curse around and occasionally go to the track truck. Thanks for the info I will probably pick up the perches at Napa this week. Hopefully I start the install next weekend I will try and get as many pictures of the install and document any road bumps here.
Logistics Pro
Joined: May 2015
Posts: 4,463
Likes: 954
From: Tri Cities, TN
When I did the compression test it was pretty high but it's just gonna be a fun curse around and occasionally go to the track truck. Thanks for the info I will probably pick up the perches at Napa this week. Hopefully I start the install next weekend I will try and get as many pictures of the install and document any road bumps here.
Also the cranking pressure you get from a compression gauge is not the same as compression ratio. You really need to do some advanced searches and read as much as you can before you start on it. Just removing the rivets from the center crossmember with the cab on could take an entire day.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
This has been done many times and if you use the advanced search you will get back a bunch of stuff. My truck came with a 460/C6 but I removed it in favor of a 351C
First you need the engine perches (aka towers/stands/supports) from a 70's truck that came with a 460.
First you need the engine perches (aka towers/stands/supports) from a 70's truck that came with a 460.
D3TZ-6028-A Right & D3TZ-6029-A Left .. Engine Supports aka perches/towers/stands / Obsolete
D3TZ-6030-A Right & D3TZ-6031-A Left .. Brackets-Mount to the engine block, rubber insulators bolt to these then to the supports / Obsolete
2) D3TZ-6038-A .. Rubber Insulators, right/left same / Obsolete
--------------------------------------------------------------------------
D8TZ-6A023-C (replaced D3TZ-6A023-A) .. Engine Rear Support (some people call it a cross member) / Obsolete
1973/79 F100/250 460 Regular Cab; 1973/76 F100/250 360/390 2WD/C6 Regular Cab.
D3TZ-6068-A .. Rear Rubber Insulator / Obsolete
1973/76 F100/350 460 except F250/350 Crew Cab.
Upper pic:
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