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THE LOBBY A gathering place. Introductions, sports, showin' off your ride, birthday-anniversary-milestone, achievements, family oriented humor. |
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#1
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ANYONE IDENTIFY THIS BLOCK
stamped on front DS1941A
4 bolt main casting date is C021 with the 71 cast beside the distributor hole casting number is 481988 |
#2
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481988 is a '71-'75 400 block. This one was cast March 2, 1971. Interesting that it has 4 bolt mains.
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
#3
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SR block ?
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#4
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/\/\ that's my guess.
the second picture appears to not have an application code or EUN.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#5
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DS is "usually" a engineering block.Can you post a pic of the lifter bore area and the back of the block?Tom
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#6
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Agree with Tom S.
DS typically meant "Developmental Series" as in a Pontiac Engineering piece Get that years ago from Ron Aycock, he had a few?
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Buzzards gotta eat... same as worms. |
#7
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Are my eyes deceiving me, that distributor bore looks offset and looks like V or SD size.
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#8
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Does not look like the large one to me from the pic.Tom
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#9
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photo titles assume RA V
you're welcome, Capt. Obvious |
#10
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There looks to be a stamping under the cast "71".
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So long, farewell. |
#11
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I’ve seen where Pontiac cast 400 blocks for high performance applications and used the basic 481988 as the basis.
I’d guess this to be a special run for engineering use or possibly something destined for SR based on the distributor hole, which looks like it accepts the large distributor gear. It may be for a tunnel port engine. What does the lifter galley look like? And where are the cylinder wall valve reliefs located on the deck surface? |
#12
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I actually have two of these. identical dates, identical ds numbers. one however has drain plugs at the front lower sides. really weird.
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#13
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Do you know the bore diameter? And did you purchase both together?
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#14
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its a 400 matter of fact the other block has 400 cast on the side of it. ill try to post pics of it if I get home in time tonight.
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#15
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Tell us if the distributor hole is normal size or larger?
Also no extra casting ribs in lifter valley? (as others have said)
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#16
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Guys,with me getting involved in this V stuff,over the years I have seen so many diff DS and engineering stuff and there is no true rhime or reason.The early all alu pontiac engine I found way back in 1964 and finally owned used a early block with a 61 and later bell pattern,the only one ever seen.The alu V block was a engineering reject and was pulled from the trash.I have owned a RA V 400 block with a transfer lug,my 366 block had the joined lifter bore but no dry sump provision.Barry had a 303 std deck with the dry sump but no joined lifter bores.The 303 std deck I just bought is 4 bolt 70 400 block.I have never owned a splayed main block,Wade at BOP has some unusual DS stuff on his site.I NEVER say never about engineering and DS stuff.My guess with the non lifter bores on std deck 303s were they were never going to get enough cam in one to hurt it.The 303 short deck V was the block our hobby could use for the boosted guys these day.Maybe the strongest pontiac production block IMO.Tom
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#17
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this is all so cool!
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#18
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John Herslow told me that Pontiac had given him at least 1 or 2 HD 400 blocks. This was late 70s early 80s when I bought some parts from him. Didnt say for what applications but he was trying a SM ,super modified Firebird at one time. Not sure whether,A,B,or C SM.
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#19
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Subscribed...
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#20
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here are the pics of the other block (I refer to it as the "blue" block)
I got the first one pictured from mickey thompsons family member back around 80 to 81 when I bought all kinds of high perf stuff. (swiss cheese engine, early sd heads, intakes, experimental junk, fuel injection set ups, one of the 4 cylinder sd engines that he ran in that shorty rail dragster, list goes on and on). it was marked ra-5 as you can see in one of the pics. note the weird plugs on the front side of the block that this one has but the other one doesn't. also has something stamped above the casting date that I cant make out in the picture and honestly never noticed it until I was downloading the pics. |
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