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#1 |
Registered User
Join Date: Mar 2009
Location: NW, Colorado
Posts: 285
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350 Motor Questions
At what points in time have the changed the 350 block?
I have a buddy with a 98 Tahoo that needs a new motor... We have a mid 70 motor, can we make the 2 mesh? I know the 350 is awesome because it has been relatively unchanged for years, but where can I find a chart or information about what years are all the same and how different years may be able to work. Thanks a bunch. I am atr work and do not have time to research right now other wise I know I could find it.
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#2 |
Registered User
Join Date: Dec 2010
Location: Burleson, Texas
Posts: 596
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Re: 350 Motor Questions
The original design of the small block remained remarkably unchanged for its production run, which began in 1955 and ended, in passenger vehicles, in 2003. The engine is still being built today for many aftermarket applications, both to replace worn-out older engines and also by many builders as high-performance applications. There were, however many minor changes made to the engine over the years.
1986 - 1995 The troublesome leaky valve cover surfaces were changed such that cylinder head mounting lip was raised and the bolt location was moved from 4 bolts on the perimeter, to 4 bolts down the centerline of the valve cover (this design debuted on the Corvette in 1984, and Chevrolet 4.3L the year before). The troublesome rear main seal was changed from a 2-piece rope design to a 1-piece design that used a mounting appliance to hold it in place. This necessitated a change in the flywheel/flexplate bolt pattern as well. Also changed were the mounting angles of the center 2 bolts on each side of the intake manifold (from 90 degrees to 73 degrees) and the lifter bosses were increased in height to accept roller lifters. The alloy heads for use in the Corvette still retain the non-angled bolts (center 2 bolts attaching to the intake). 1996 - 2000 This was the last change for the Generation I engine, and continued through the end of the production run in 2003; all 1997-2003 Generation I engines were Vortec truck engines. The cylinder heads were redesigned using improved ports and combustion chambers similar to those in the Generation II LT1. This change resulted in significant power increases. From the web of course....
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#3 | |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: 350 Motor Questions
Quote:
I don't have a lot of experience with the new ones but I believe you need a crank position sensor and knock sensor. A fuel pump block off. I sure there is other stuff. I did once help a guy in that situation. He had a 5.7 liter in a 99 Suburban. He got a used late 90something 5.7 liter out of a van from a reputible used engine supplier. We pulled his bad one and put it on a stand. We put the "new" one on a stand. Then we threw a few gaskets on the "new" one. Resealed the intake that always leaks. And put his accessories on the front of the "new" one. We got that done in three afterwork sessions in my shop. I'd go that route before trying to make an older one work. It will fit just fine but it will take a lot to make it work.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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