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Old 03-02-2026, 12:20 PM
Ashley P Ashley P is offline
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Jack Gifford, would the engine block almost always be "stiffer" than the chassis? If so, then tying both ends of the block to the chassis (with solid mounts) would be using the block to strengthen the chassis....correct?

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Old 03-02-2026, 02:24 PM
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I would also put a couple bars for 'fore & aft' motion. On my dragster it helps a lot. You'd be surprised how much it moves back/forth. (bent a few aluminum plates. use chromoly now)



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Old 03-03-2026, 01:51 AM
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Quote:
Originally Posted by Ashley P View Post
... would the engine block almost always be "stiffer" than the chassis? If so, then tying both ends of the block to the chassis (with solid mounts) would be using the block to strengthen the chassis....correct?...
With the length of a chassis being about ten times the length of an engine, improvement in chassis stiffness would be trivial. Besides, I was responding to steve25's concern with torque stress on an engine.

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Old 03-03-2026, 09:36 AM
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Nacs Fab Nacs Fab is offline
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I have front and Mid in my 69 Bird, just have it welded in after making the brackets on a laser.

I used the All Pontiac Brackets from Butler.

They clear my 2-1/8" Mad Dog Headers without problems. Heres pics without headers.





Here's a pic when I had the headers on my Mock Up:



Headers are well past the turning down stage before the mid plate because they have to clear the factory Oil Filter housing/Filter on one side and the starter and provide access to it on the other.
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Click image for larger version Name: bird engine2.jpg Views: 192 Size: 109.8 KB ID: 665784   Click image for larger version Name: bird engine3.jpg Views: 195 Size: 125.0 KB ID: 665785   Click image for larger version Name: IMG_1742.jpg Views: 198 Size: 82.1 KB ID: 665786  

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Old 03-03-2026, 10:59 AM
Ashley P Ashley P is offline
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Quote:
Originally Posted by Jack Gifford View Post
With the length of a chassis being about ten times the length of an engine, improvement in chassis stiffness would be trivial. Besides, I was responding to steve25's concern with torque stress on an engine.
I'm thinking about chassis flex/twist/torque that will be transferred to the block. If the chassis between the front and mid mount is not as stiff as the block, the block would then be subject to that torque.

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Old 03-04-2026, 12:20 AM
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Tim Corcoran Tim Corcoran is offline
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Quote:
Originally Posted by Jack Gifford View Post
With the length of a chassis being about ten times the length of an engine, improvement in chassis stiffness would be trivial. Besides, I was responding to steve25's concern with torque stress on an engine.
Jack, if I understand what you are saying having a front and mid plate will stress the block? What is the recommended installation then? Maybe I don't understand what you said.

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Old 03-04-2026, 01:04 AM
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Tim & Ashley- please re-read my post #5.

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... or has built a record breaking DOHC hemi four cylinder Pontiac?
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... or has a Pontiac born the same year as Jim Wangers? (1926}
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