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#1
08-17-2005, 11:40 PM
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YH CODE '70 block
Hi, was wonder the application of a block I have a YH 455, 1970. belong to a GP originally?? thanks!
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#2
08-18-2005, 01:15 AM
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Bruce, that's the "base" 1970 455. Would have came with #15 heads. Was not available in the Grand Prix or GTO. Was available in full size only (Bonneville, Catalina, etc...) The one you have will be a 2 bolt main block, but drilled for 4 bolt.
The GP 455 was coded XF with #64 heads and was a 4 bolt main block with 4 bolt caps. The GTO was coded YA and WA with 64 heads and 4 bolt block. You could also get the 455 XF/64 as optional in a full size. |
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#3
08-18-2005, 07:34 AM
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SOME '70 YH coded 455's had factory 4 bolt caps. Gotta ck 'em.
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#4
08-18-2005, 10:09 PM
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Thanks GUYS!! yeah its a 4 bolt block, 2 bolt caps, just didnt want to use a block for a project if its belongs in someones muscle car!!, thxs again!
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#5
11-08-2005, 04:12 PM
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70 blocks
Anyone know which blocks could be had in a 70 Grand Prix?
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#6
11-08-2005, 10:59 PM
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1970 Grand Prix was available with these engines:
WX was a 350hp 400cid for a manual trans. XH was a 350hp 400cid for autos YB was a 265hp 400cid for autos (2bbl. carb. with 8.8:1 ratio) WG 370hp 455 for a manual trans XF 370hp 455 for an auto.
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69 Grand Prix SJ-Midnight Green 69 Grand Prix J-Starlight Black 69 Grand Prix J-Limelight Green 70 Grand Prix J-Granada Gold 70 Grand Prix J-Verdoro Green (4-speed) 
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#7
11-08-2005, 11:33 PM
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Do you know if the 400's were a 9799914 casting block?
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#8
11-09-2005, 03:53 PM
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YES
Why, yes they were, all three. RD
Quote:
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#9
11-14-2005, 02:28 AM
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Does anybody know what a 1970 grandprix 455 engine is worth? It is a xf code with 64 heads complete carb to pan, motor is still in car with auto trans. Motor has been sitting for a lot of years and my guess it's seazed. It is in grandprix sj . Also does any body know if the rear dif would be 10 or 12 bolt posi from factory? I don't think the car has been touched as far as original. Car is in rough shape sitting on ground sinking ,but could be worth something ? thanks for reply's
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