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Old 08-22-2020, 11:41 PM
henley henley is offline
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Default 70 455 HO

I am looking for a complete 70 YC 455 HO engine. I am also ok with piecing one together. I need everything except distributor. Please let me know what you have and price. Pm or call 330-714-7916. Chuck

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Old 08-23-2020, 01:50 PM
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I have a complete xf engine im trying to sell

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Old 08-23-2020, 02:22 PM
'ol Pinion head 'ol Pinion head is offline
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Have either a 70 YA or '70 YC shortblock, will double ck.

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Old 08-24-2020, 10:35 PM
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i have #64 heads ... pm me

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Old 08-26-2020, 01:28 PM
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What carburetor number will you need?

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Old 08-26-2020, 01:36 PM
henley henley is offline
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I will need carb 7040268

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63 Z-11 JACKSHAW CHEVROLET CAR
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68 ROAD RUNNER HEMI 4- SPEED
69 RA V JUDGE
70 RA III 4- SPEED CONV. GTO
73 FIREBIRD
98 MUSTANG CONV
05 LEXUS SC430 CONV
08 LEXUS ES350
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Old 08-26-2020, 09:45 PM
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wasnt YC a non HO engine in 70?

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Old 08-26-2020, 11:29 PM
poncho-mike poncho-mike is offline
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I believe the YA was an early engine and the YC was a late engine. But I've seen both in GTOs. I'm not sure why the VINs were different. I had a October 1969 and an Feb 1970 YC, both came out of GTOs and had the 64 heads. One car had ram air, the other didn't, but I don't remember which was which.

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Old 08-27-2020, 04:14 PM
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i thought XF was the HO code for the auto cars

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Old 08-27-2020, 08:35 PM
poncho-mike poncho-mike is offline
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XF was the automatic GP 455HO.

The YC and YA engines came in the GTOs. I'm not sure why there were two different codes for the GTO, but I suspect it was due to a mid-year changeover in something.

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Old 08-28-2020, 11:45 AM
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My XF came in a Bonneville , or any other big car also that was special ordered. Auto car and still used the 7040268 carb

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Old 08-28-2020, 10:01 PM
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Quote:
Originally Posted by poncho-mike View Post
I believe the YA was an early engine and the YC was a late engine. But I've seen both in GTOs. I'm not sure why the VINs were different. I had a October 1969 and an Feb 1970 YC, both came out of GTOs and had the 64 heads. One car had ram air, the other didn't, but I don't remember which was which.
I've documented the YCs showing up on Dec. built car, but the YAs before that. Would love to find out what changed to re-code the engine. I had thought maybe the YA was made with a different metallurgy.
As far as the XF was concerned, the engine was the same, just the one exhaust manifold was different. And, the code stayed the same throughout the model year.

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Old 08-29-2020, 12:24 AM
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Quote:
Originally Posted by henley View Post
I will need carb 7040268
If you cant find a complete engine and need to piece together I have a 7040268

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Old 08-29-2020, 10:03 AM
poncho-mike poncho-mike is offline
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If the metallurgy had changed, then the big car engine codes should have changed as well.

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Old 09-01-2020, 06:25 PM
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Well, it had to be something. Like rods or crank prep or ???.

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