Would anybody be able to tell me what is this engine ,serial# 485428,block code b151 and head casting date c261 ,here some pics whit these number it seam to be an 1971 455 h.o .
As was already mentioned in your other thread at http://www.v8buick.com/showthread.php?t=217472 , you might want to try a Pontiac message board to get some feedback. Here's a start: http://www.pontiaczone.com/forum/showthread.php?t=20614 Devon
If it was an HO it would have an aluminum intake and round port heads. It's a little hard to see the heads but it doesn't look like you have either.
Here's a good pic of a 455HO. Round port heads and streamlined exhaust manifolds, painted aluminum intake among its features.
The head casting number is C 261 AND THE BLOCK IS B 151 there is also and other number on the side of the block GM7 D N
These might help you find the correct numbers; http://www.yearone.com/updatedsinglepages/Id_info/pontiacengineid/pontengid3.asp http://www.pontiacpower.net/castnum01.html
The block casting 485428 was used across multiple years, on anything from a Bonneville to a GTO, 2-barrel or 4-barrel. Need the two character code by the water pump, should be something like WW, WJ, etc. There was a 1970 455 H.O., but it was not a round port engine (steel intake too). The 71-72 455 H.O.'s were round port, and used an aluminum 2-piece intake.
Casting codes for from March 1967 on are found on the rear of the block just behind the number 8 cylinder 481708 1970 400 4 RA5 9799140 1970 455 360, 370 2 9799914 1970 400 265, 290, 330, 350 2 9799914 1970 400 345, 366 4 RA3 9799915 1970 400 370 4 RA4 9799916 1970 350 255 2 481990 1971-72 350 175, 250 2 483677 1971-72 455 200, 250, 280, 325 2 483677 1971-72 455 300, 335 2&4 HO 481988 1971-74 400 200, 250, 265, 300 2 485428 1971-74 455 200, 215, 250, 265, 300 2&4 485212 1972 366 4 487638 1972 455 2 493482 1973 455 2 490132 1973-74 455 290 4 SD 488986 1973-76 350 150, 155, 170, 175 2 488986 1975 400 2 early 500557 1975 400 2 late 500810 1975 350 2 late 500813 1975-76 455 2 525934 1977 301 135 2 568557 1977-79 400 180, 200, 220 2
Pontiac heads have their casting codes cast on to the center exhaust ports. 11 1970 350 255 2.11/1.77 11 1970 400 265 2.11/1.77 12 1970 400 330, 350 2.11/1.77 72 MT Ram Air III 12 1970 400 345, 366 2.11/1.77 72 Ram Air III 13 1970 400 330, 350 2.11/1.77 72 AT Ram Air III 15 1970 455 360 2.11/1.77 72 16 1970 400 290, 330 2.11/1.77 Press-in studs 47 1970 350 255 2.11/1.77 47 1970 400 265 2.11/1.77 64 1970 455 360, 370 2.11/1.77 87 HO 614 1970 400 370 2,11/1,77 71 Ram Air IV 66 1971 455 325 2.11/1.77 114 AT 94 1971 350 250 2.11/1.77 96 96 1971 400 300 2.11/1.77 96 GTO 98 1971 455 280 2.11/1.77 111 99 1971 400 265 2.11/1.77 96 191 1971 455 335 2.11/1.77 111 HO 197 1971 455 335 2.11/1.77 111 HO 7F6 1972 455 300 2.11/1.77 111 HO 7H1 1972 350 175 2.11/1.77 96 7J2 1972 400 200 2.11/1.77 96 7K3 1972 400 250 2.11/1.77 96 7L4 1972 455 200 2.11/1.77 96 7M5 1972 455 250 2.11/1.77 111 16 1973 455 290 2.11/1.77 111 Super Duty, screw in studs 46 1973 350 150, 175 2.11/1.66 98 46 1973 400 170, 185 2.11/1.66 98 4C 1973 350 150, 175 2.11/1.66 98 4C 1973 400 170, 185, 200 2.11/1.66 98 4X 1973 400 200 2.11/1.66 98 4X 1973 400 230 2.11/1.66 98 screw in studs 4X 1973 455 215,250 2.11/1.66 114 screw in studs 16 1973 455 290 2.11/1.77 111 Super Duty , screw in studs 16 1974 455 290 2.11/1.77 111 Super Duty, screw in studs 46 1974 350 155, 170 2.11/1.66 98 46 1974 350 200 2.11/1.66 89 GTO screw in studs 46 1974 400 175, 190 2.11/1.66 98 4C 1974 350 155, 170 2.11/1.66 98 4C 1974 400 175, 190 2.11/1.66 98 4C 1974 400 200 2.11/1.66 98 4C 1974 400 225 2.11/1.66 98 AT, screw in studs 4X 1974 400 200 2.11/1.66 98 4X 1974 400 225 2.11/1.66 98 screw in studs 4X 1974 455 215, 250 2.11/1.66 114 screw in studs 51 1975 455 200 2.11/1.66 101 5C 1975 350 155, 175 2.11/1.66 101 5C 1975 400 185 2.11/1.66 101 6H 1975 455 200 2.11/1.66 124 HO 6S 1975 455 200 2.11/1.66 124 HO 6H 1976 455 200 2.11/1.66 124 6S 1976 350 160, 165 2.11/1.66 124 6S 1976 400 185 2.11/1.66 124 6X 1976 350 160, 165 2.11/1.66 101
You need that 2 letter code next to the water pump as stated. 455 HO codes are WC, WL and YE. Others would be D port engines. http://www.wallaceracing.com is a great source plus if you go to http://www.performamceyears.com and go to their forums plenty of info there. It is probably drilled for 4 bolt mains but has 2 bolt caps. If it is in good shape $500 or so is a good number for the block/crank. Performance Years has a for sale section. Check there. You can join and sell if you want.
The two letter code is D-N ,i need to order an gasket kit for that engine what would i ask for is it an 1971 Pontiac 455 thanks Denis.
D-N is near the distributor is Day-Night on the shift of the date shown when the engine block was cast. The code I am refering to is stamped very near the water pump on the front passenger side of the front of the block. If you will look at the picture above you will see what I am talking about. It may be almost under the edge of the water pump. There is a flat surface on the passenger side of the block. The engine code, vin of the car and the unit number of the number of cars build on that assemblyi line. Just a standard '71 455 gasket set is fine.
Here are what i have found by the water pump C328399 Y C AND WOULD THIS GASKET KIT BE GOOD http://cgi.ebay.com/Fel-Pro-Full-Ov...r_Truck_Parts_Accessories&hash=item1c1435c1d7
