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#1
03-02-2017, 05:34 PM
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1973 SD455 Intake Advice/Input
Hi all
I just bought this off Ebay. The concern is the part number is stamped into the part not cast. Everything else looks great can I get your opinion. Thanks Brad
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Brad Pringle Wellston, Michigan 1973 SD 455 TA Auto 1974 SD455 TA 4 Spd |
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#2
03-02-2017, 05:47 PM
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Here's some pics. These numbers are definitely cast in--NOT STAMPED.
Here's what Rocky said in one of his books: "...The 1973–1974 SD-455 cast-iron manifold is otherwise externally identical to a standard production casting that year, but its runners taller to improve airflow. It’s easiest identifiable by the large “LS2” cast onto its coolant crossover and/or underside..." Last edited by ponyakr; 03-02-2017 at 06:01 PM. |
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#3
03-02-2017, 05:54 PM
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agreed should be cast. But I can live with that. You see any other issues? LS2 on top and bottom looks correct date is good? anything I am missing?
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Brad Pringle Wellston, Michigan 1973 SD 455 TA Auto 1974 SD455 TA 4 Spd |
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#4
03-02-2017, 06:14 PM
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If you bought it and can live wth it. All good?
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Mike/Illinois |
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#5
03-02-2017, 06:19 PM
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My only thought is why would anybody grind off a number, then stamp the same number back.
I suppose whoever cast that batch of intakes could have just failed to add the casting number. There were all sorts of casting mistakes. Don't appear that much care was taken stamping those numbers. You'd think that more care would have been taken, for such a high performance part. But, there are workers everywhere who just don't care about the quality of their work. |
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#6
03-02-2017, 06:22 PM
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Brad, what's the number on the EGR? That's one part that's been eluding me for some time now.
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#7
03-02-2017, 06:31 PM
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If you can grind the X off of the LS2X ( 74 intake ) you have a 73 intake. I've seen it done. I have had a few extra LS2X intakes and thats the first I've seen that was not cast.
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#8
03-02-2017, 07:11 PM
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It's an early 74 SD intake.
SD Intakes There is some posts and threads on here also about it.  Found one: LS2 Intakes
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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 Last edited by johnta1; 03-02-2017 at 07:17 PM. |
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#9
03-02-2017, 08:20 PM
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It's a 73 SD intake with K-19, 1972 casting date. The ground off cast numbers and handstamped new numbers (494405) are absolutely correct. It's one of the interesting idiosynchracies about SD engines.
"Through years of experience and research with this particular power plant, the author and other owners of Super Duty Formulas and Trans Ams have uncovered a few oddball discrepancies during its two-year offering. Because of the EPA-mandated changes to the emissions system and consequent assignment of new part numbers to those components affected by the changes, 1973 intakes were renumbered. Intakes have been found with the entire original casting number of "494415" wiped off and re-stamped with the new number of "494405," as illustrated here. Some have had "4415" wiped and re-stamped with "4405," and some have had only the "15" wiped and re-stamped with "05."" |
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#10
03-02-2017, 09:58 PM
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Ok TY
NJsteve,
That is excellent news thank you. that is what I was hoping to hear. thanks again Brad
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Brad Pringle Wellston, Michigan 1973 SD 455 TA Auto 1974 SD455 TA 4 Spd |
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#11
03-02-2017, 10:22 PM
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Wouldn't the place to the left of the radiator outlet on crossover be blank for 73?
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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 |
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#12
03-02-2017, 10:33 PM
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Pic of 73 SD
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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 |
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#13
03-02-2017, 10:43 PM
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Quote:
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1973 Formula 400 4 spd 04C build date Norwood assembly plant. |
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#14
03-02-2017, 11:24 PM
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"Bought off eBay today"?? How come I missed it? Was it not listed as an SD intake? Grrrrrrrrrrr......
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#15
03-02-2017, 11:52 PM
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Because of the EPA mandated emission modification, all 73 SD intakes were modified at the engine plant for a temperature controlled sensor for the egr time delay relay. The sensor is located on the right side water crossover that was previously cast blank. This change order required a casting number revision previously noted. All the 73 intakes I have, whether orphan engines or on cars, are hand stamped on the entire number.
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#16
03-02-2017, 11:56 PM
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I would not use the intake pictured above as a reference, looks like a 74 intake; egr vacuum routing is totally incorrect in addition to a host of other inaccuracies like pcv system
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#17
03-03-2017, 07:18 AM
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My 73
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#18
03-03-2017, 08:06 AM
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I'll take it if you don't want it.
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Some guys they just give up living And start dying little by little, piece by piece, Some guys come home from work and wash up, And go racin' in the street. Bruce Springsteen - Racing In The Street - 1978 |
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#19
03-03-2017, 08:30 AM
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1973 Intake
Like I stated earlier just thought it was odd. but not enough to scare me off. I feel lucky to have the opportunity to own this piece. Now just need the rest of the car. LOL thanks everyone. Brad
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Brad Pringle Wellston, Michigan 1973 SD 455 TA Auto 1974 SD455 TA 4 Spd |
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#20
03-03-2017, 09:50 AM
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JohnTA , I believe the picture you posted is from Larry Navarro's old '73 Y code SD clone that he put a real SD455 into, ...pretty sure Larry used a bunch of different parts to put the car together...so not a "factory-appearing" SD engine.
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