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| | | Forums66 Topics128,101 Posts1,056,180 Members48,436 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | Check the engine numbers on the rear of the block, drivers side of block. Go to Mortec .com and check the numbers, in the 80's the rear seal was changed to a i piece seal and the flywheels are different. As 78 buckshot said the 400 has external balanced flywheel and harmonic balancer, you don't want to put that on your engine. If you do it will shake so bad when running you will loose every dental filling in your mouth.
Tommy
59 apache 1/2t
261 short stepside
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