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#1
01-07-2026, 09:13 PM
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Block to Bell Housing Bolt Pattern
I've searched this site using all different search terms and couldn't find these dimensions.
Is this the correct drawing for a mid 70's Pontiac block?
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69 Firebird Conv, 350 HO w/3 on the tree swapped to Tremec 5 Speed - Sold 72 GP, 400 Auto - Sold 09 G8 GXP M6 Orig Owner - Sold 76 Trans Am 455, 4 Speed - Current |
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#2
01-08-2026, 05:36 AM
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Are they calling out bellhousing bolts as 5/16-18? I'd have expected 3/8-16.
Other than that, that seems to be all correct for the bellhousing bolt pattern. Not sure about the flywheel bolt patterns. |
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#3
01-08-2026, 06:22 AM
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That’s anything but a Pontiac block.
The dimensions are different that they give and besides that look at the 4 water jacket frost plugs seen behind the flywheel. Pontiacs only have two on each side and there higher up.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
01-08-2026, 06:55 AM
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The casting about the 7.07 dimension doesn't look right. I think it be smoother angle and no lip. Could be Buick or Olds.
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#5
01-08-2026, 07:33 AM
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Even if it was a B or Olds block the bell housing bolt holes would be 3/8” .
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#6
01-08-2026, 07:43 AM
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This is from Gavin (I believe) :
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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! 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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#7
01-08-2026, 10:06 AM
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I just cut a fixture last month utilizing these holes and can verify them to be true.... so I assume the top ones are too.
Kris. |
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