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#1
06-24-2026, 07:10 AM
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400 block question
I got this 70’ 400 block from a friend who passed away he ran super stock does this look like it has been O ringed or sleeved?
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#2
06-24-2026, 07:27 AM
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Those round circles look like o-ring grooves?
Are they a groove or just marks left from a gasket? What is the engine code for the block? 
__________________
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! W.E.C moment "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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#3
06-24-2026, 07:34 AM
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They are raised grooves from what I can tell the block has been machined at some point.
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#4
06-24-2026, 08:39 AM
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If they are raised it probably is sleeved?
Usually they are milled flush with block.
__________________
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! W.E.C moment "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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#5
06-24-2026, 08:42 AM
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Looking at the underneath pic, it could be sleeves. They will not fill the bore all the way to the end usually.
Is there a step at the bottom?
__________________
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! W.E.C moment "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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#6
06-24-2026, 09:35 AM
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Looks like my O-Rings. My block had also been sleeved in one cylinder and that stepped space on the bottom looks same. Make sure you remove the o-rings and save them when you hot tank the block.
__________________
69 Firebird - Angry Bird 455 with 84mm Torqstorm |
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#7
06-24-2026, 10:30 AM
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does that one have 4 bolt caps or 2? looks like its a ceapshoot with that casting 400.
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#8
06-24-2026, 10:59 AM
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Looks like they do have step at the bottom and the o rings are raised slightly. It is a 4 bolt 400 block
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#9
06-24-2026, 11:00 AM
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What are your opinions on a sleeved block for street use?
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#10
06-24-2026, 11:02 AM
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I have no problem with them. If done right.
__________________
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! W.E.C moment "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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#11
06-24-2026, 12:02 PM
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Quote:
__________________
69 Firebird - Angry Bird 455 with 84mm Torqstorm |
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