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#1
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4 Bolt 400
Fellas
Long time no see. Buddy has a 4 bolt 400 block. Said to come out of a 69 Judge. Don’t have codes yet just saw pic of bottom end. I can’t remember - did any RA III come with 4 bolt mains? Or only IV? Scott
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Please check out my YouTube channel for vintage/classic car and truck builds and shenanigans! https://www.youtube.com/watch?v=jq61KxKp1Is&t=14s |
#2
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factory '69 usage RAIII blocks were 2bolt mains.
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Buzzards gotta eat... same as worms. |
#3
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70 RA IIIs were 4 bolt caps along with RA IVs.Tom
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#4
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You may find that it is a Service Replacement block
All of the Service Replacement (SR) 400cid blocks we've handled had 4-bolt mains, although I believe they were produced both ways.
I think Pontiac figured that if you managed to break a 2-bolt block, replacing it with a 4-bolt block might be a good idea. As Tom S points out, ALL the factory 1970 Ram Air III and IV engines had 4-bolts. In 1969 it was only the RAIVs. But Pontiac was always nice enough to produce something that challenges any absolutes we thought were undeniable..... |
#5
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Thanks fellas. I’ll post the #’s when I get them.
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Please check out my YouTube channel for vintage/classic car and truck builds and shenanigans! https://www.youtube.com/watch?v=jq61KxKp1Is&t=14s |
#6
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Bulletpruf,
Welcome back. Look forward to your future posts. Always interesting and educational. BTW, thanks for your service. Jim |
#7
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Quote:
Scott
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Please check out my YouTube channel for vintage/classic car and truck builds and shenanigans! https://www.youtube.com/watch?v=jq61KxKp1Is&t=14s |
#8
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Numbers yet? ;-)
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1969 Judge (Liberty Blue / Blue, 4SPD) |
#9
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Right, I guess Im not the only one looking for their correct lost 1969 RAIII motor.
Oh please, Oh please, Oh please be mine Humbler, are you the Craiglist searcher? |
#10
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Guy was told that it came out of a 69 Judge. If so, perhaps it's a IV block. We'll see.
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Please check out my YouTube channel for vintage/classic car and truck builds and shenanigans! https://www.youtube.com/watch?v=jq61KxKp1Is&t=14s |
#11
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Some 1970 model year Ram Air III engines have the 9799915 block (9799914 with the 4 machined away and replaced with a 5), with the WS (manual) stamp on the front.
My February 1970 Lordstown produced 4 speed M-21, blue/blue deluxe interior TA that I have owned since 1979 has that, with the W well stamped but the S more faintly stamped. Block's casting date is early January.
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1970 Lucerne Blue Firebird Trans Am, deluxe blue interior. Original Ram Air III, M-21, 3.73. Being built as a 4" stroke "434" with SR 614 Ram Air IV heads 1972+ Lucerne Blue 4-door hardtop "what if" T-41 Le Mans Sport GT/Grand Am concepts. Equipped with future 3" journal "455 HO"/"what if" prototype "SD 455". What if GM had continued production of the 1970-72 GM A body somewhere in the southern hemisphere? |
#12
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Quote:
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#13
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He probably sees the 'L' figuring it's Lordstown?
(L is for Van Nuys )
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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 |
#14
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I stand corrected.
Was going from memory. My 1970 Trans Am has the "N" - Norwood, Ohio. https://www.hotrod.com/articles/norw...plant-reunion/ https://www.chevy-wiki.com/wiki/Norwood_Assembly Yes, "L" is Van Nuys. Question- how did they get an "L' designation, rather than say "V".
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1970 Lucerne Blue Firebird Trans Am, deluxe blue interior. Original Ram Air III, M-21, 3.73. Being built as a 4" stroke "434" with SR 614 Ram Air IV heads 1972+ Lucerne Blue 4-door hardtop "what if" T-41 Le Mans Sport GT/Grand Am concepts. Equipped with future 3" journal "455 HO"/"what if" prototype "SD 455". What if GM had continued production of the 1970-72 GM A body somewhere in the southern hemisphere? |
#15
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I believe the L for Van Nuys signified Los Angels but just a guess.
Factory literature indicates even the base GTO 400 with manual trans (WT) was four bolt main. I don't know if this was actually the case in production.
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My Break Away Squad 1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s) 1969 Custom S 2dr ht 1969 LeMans (2dr & 4dr ht & Cvt) 1969 LeMans Safari wagon 1969 GTO (2 Cvt, 2 ht & Judge ht) 1969 Cat (3 Cvt’s & 2dr ht) 1969 Ventura wagon 2 seat 1969 Exec 4dr post 1969 Bonnie Cvt & 2 wagons 1969 Bonnie Brougham (4dr ht & Cvt) 1969 Grand Prix 2 SJ’s 1969 2+2 2dr ht (Canadian) |
#16
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We've had a couple 1969 'WT' engines and four or five 1970 'WT" engines.
Every one of them had 2-bolt main caps.
And ALL of the 1970s were drilled for 4-bolt mains, but had 2-bolt caps. The 1969s did not have the extra holes drilled. But you never know what Pontiac might have done....... |
#17
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btw in my last post I forgot to say i was referring to the 70 model year, 69 was all 2 bolt except the RAIV but factory literature for 1970 model year says all GTO' engines except the base 400 with automatic (YS) had 4 bolt mains. Has anyone seen 1970 WT (350 horse 400 with manual trans) with 4 bolt mains?
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My Break Away Squad 1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s) 1969 Custom S 2dr ht 1969 LeMans (2dr & 4dr ht & Cvt) 1969 LeMans Safari wagon 1969 GTO (2 Cvt, 2 ht & Judge ht) 1969 Cat (3 Cvt’s & 2dr ht) 1969 Ventura wagon 2 seat 1969 Exec 4dr post 1969 Bonnie Cvt & 2 wagons 1969 Bonnie Brougham (4dr ht & Cvt) 1969 Grand Prix 2 SJ’s 1969 2+2 2dr ht (Canadian) |
#18
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I have original YS block in my 69 and it is drilled for 4 bolt mains
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69 gto ,all#match,467,th400,3:55 Easton posi,resto completed may 2016. 427 hp/530tq. Stump puller with stock#62 , stock intake and qjet Th400 gone. Tkx close ratio with .64 of 66 Pontiac Beaumont sport deluxe,BB 5sp tko 3:08 auburn 450hp 550 torque wife sold it |
#19
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Quote:
From what I've understood, it wasn't the norm, but wasn't terribly unusual either. From everything I have read suggests that pre-1970 400 blocks all had two bolt mains except for the RAI, RAII, & RAIV; It reads as though starting in 1970 things changed a bit, as all the RAIII engines came with four bolt mains, and up through 1972 the odd 400 Firebird/GTO manual transmission engine has been found to have four bolt caps. It also reads as though starting in 1970 (maybe this also applied to late 1969 blocks as well) all 400-4bbl engines were drilled and tapped for four bolt mains. I am unsure as to when 400 blocks started to usually NOT be drilled and tapped for four bolt mains - although I'd wager a guess of 1973 Regarding the earlier comment: Quote:
It reads as though the block was replaced with either an as correct one, or a readily available one. HERE is the thread I recently created asking about SR blocks.
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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) |
#20
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if you go to the other thread this has been discussed recently and I posted pics of 2 69 WS blocks that were drilled for 4 bolt but with 2 bolt caps. I have had several WT code 69 engines that were the same way drilled for 4 bolt but with 2 bolt caps.
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