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#1
10-05-2010, 05:27 PM
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400 or 428 ?
I'll be going to pull a 67 bonneville motor tomorrow. I just realized I took the sellers word that the engine is a 400. I never checked the block codes. I just assumed since it had the 4bbl it was no doubt a 400. What are the chances it's really a 428 ? Would there be any visual clues ? I can't check the number till I get there tomorrow.
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1981 Trans Am project -YJ 400 stroked to 488 CID-74cc Eheads-10.95:1-Northwind Intake-Holley Terminator-TH400-Moser rear-Dougs Headers.... |
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#2
10-05-2010, 05:46 PM
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Which heads would have been on the 67 428's ?
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1981 Trans Am project -YJ 400 stroked to 488 CID-74cc Eheads-10.95:1-Northwind Intake-Holley Terminator-TH400-Moser rear-Dougs Headers.... |
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#3
10-05-2010, 05:54 PM
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WG 428 360 M
1967 Y2 428 360 A 1967 YY 428 360 M 1967 WJ 428 376 1967 XK 428 376 M 1967 Y3 428 376 A 1967 YH 428 376 A 1967 YK 428 376 A 1967 WL 428 A 1967 YV 428 M 1967 WS 428 M These are the 67 428 block codes. |
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#4
10-05-2010, 05:55 PM
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bonneville engine
I think that '67 and '68's had a 428 fender emblem on them if they had the 428 motor as well as a 428 emblem on the fan shroud.
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#5
10-05-2010, 06:05 PM
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Pyramid thingie cast in the back-top of block, near the dist., indicates non-400 I think. Quickest check, but it could also be a 350.
A 4-bbl manifold means nothing anymore--it could have been changed years ago. |
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#6
10-05-2010, 09:30 PM
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Quote:
I just found a '72 YH 455 with a 2bbl. Never knew it existed. All casting numbers, date codes, cylinder head codes, etc jive. I pretty much gaffed it off as a replacement motor. I got home, did some research and found it does exist. Now I'm trying to figure how I'm gonna get it out of there... 
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Tod Hoffmann 1966 GTO Montero Red Hardtop - Holley EFI'd 462, KRE DPorts/Muncie 4spd 1990 Chevy 454SS pickup - Accel DFI/T56 6spd - Hot Rod Power Tour Long Hauler 1996 Chevy K2500 ECSB 'Poopy' 2002 Honda VTX1800C 2016 Cadillac CTS Premium My project thread: http://forums.maxperformanceinc.com/...d.php?t=516826 
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#7
10-05-2010, 10:50 PM
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I thought Pontiac cast the displacement on the side of the block? Or was just for certain years?
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'68 Catalina convert. w/ 428, OEM long branch exh, QuadraJet, 3:23 Posi, GP front grille, GP bucket seats and GP tilt. |
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#8
10-05-2010, 10:51 PM
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67 428's had "670" heads same as 400. Best to go by the engine code on front of block, and other clues already mentioned.
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#9
10-16-2010, 06:54 PM
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Tod, sky hook or C4 should do it. Or bring friends along to lift it up. Good luck... it is doable if yer into S&M.
 LOL
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 Gary Get in, ShuT Up, Hang On! Member of the Baltimore Built Brotherhood MY GTO built 4th Week of March 1966 "Crusin' Is Not A Crime" Keep yer stick on the ice. |
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#10
10-16-2010, 07:24 PM
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Quote:
patrick
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#11
10-16-2010, 11:15 PM
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Get the 2 digit code from the front of the right cylinder bank, and the date code from behind the distributor (in case the engine has been changed). Or the casting number from the location shown below.
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Bill 64 GTO, tube chassis w/606" IA tall deck, PG & a pro geared Fab 9". 2750 lbs. 8.2550@164.17-1/4, 5.2901@131.97-1/8, 1.1981-60-ft. 8/10/08 
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