The Gavril 351/400/460 family was introduced in 1972 and ran until 1986 after various naming and design changes, these engines are well known for being reliable although slow.
This resource adds:
5.7/6.5/7.5 V8s
4/3 speed manual transmissions
a 3 speed automatic
2.88/4.64 gearing
Factory engine specs:
5.7
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6.5
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7.5
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All engines are much durable than the base games engines and include sounds from the bastion
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In the upcoming weeks mod approvals could be slower than normal.
Thank you for your patience.
In the upcoming weeks mod approvals could be slower than normal.
Thank you for your patience.

Gavril 351/400 Powertrain Pack 3.0
Ancient engines for an ancient truck