1998 chevy van engine
Thread Starter
Intermediate
Joined: Nov 2006
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1998 chevy van engine
Hey guys I just a free engine with very low miles on it.
What would it take to put it in my 84 with the auto trans.
Now Im not going to keep it in there but it something for now.
Im having the old engine rebuilt but this will buy me some time to hook the old engine up.
What do i need to do to make it work.
What would it take to put it in my 84 with the auto trans.
Now Im not going to keep it in there but it something for now.
Im having the old engine rebuilt but this will buy me some time to hook the old engine up.
What do i need to do to make it work.
Racer
Joined: Apr 2005
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A carb intake for vortec heads, which is pretty common, and a carb. If you want to keep fuel injection, that will be more difficult. Also an electric fuel pump designed to run low psi for the carb. I don't think the vortec motors have a provision for a mechanical pump.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Use your 1984 heads and complete Crossfire injection system, including the distributor, unmodified. Because the later engine has a one piece rear main seal you will have to use the late flexplate for the correct bolt pattern and engine balance. Piece of cake.
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Race Director
Joined: Sep 2000
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From: The Top of Utah
Assembly and fit wise, what I said above is correct. But a detail has since come to mind. Your original engine has a 9.00:1 compression ratio. The heads you will be swapping on to the truck engine have 76 cc combustion chambers. If the truck heads you are replacing have less than 76 ccs, the new combination will have less than a 9.00:1 compression and be rather sluggish. It would work, but I wouldn't recommend it for anything but the shortest term. It would be low on power and get poor fuel economy. If you plan on using this for a while, see if you can get the head cc spec on the truck engine.
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
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Le Mans Master
Joined: Jan 2002
Posts: 9,036
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From: Edmonton AB
The following casting numbers from the Mortec site might
help identify your engine.
- L31: Flat or Roller Tappets from GM?
Before beginning to swap heads, consider the chamber volume and
what the consequences will be for compression. The replacement
L31's are shown as having a -13cc dished piston
Compression Ratio : 9.0:1 w/ 64cc heads
Compression Ratio : 8.3:1 w/ 72cc heads
.
help identify your engine.
Block
10243880...350ci/5.7L...95-00...2 or 4 bolt mains
Vortec truck (& other apps), roller cam, one pc rear seal
There is also a smaller version
10243878...305ci/5.0L...96-98...2 bolt mains
Vortec truck, roller cam, one-piece rear seal
Heads
10239906 and 12558062...center bolt valve covers and narrow body
"self-aligning" rocker arms.
More information and links in this thread10243880...350ci/5.7L...95-00...2 or 4 bolt mains
Vortec truck (& other apps), roller cam, one pc rear seal
There is also a smaller version
10243878...305ci/5.0L...96-98...2 bolt mains
Vortec truck, roller cam, one-piece rear seal
Heads
10239906 and 12558062...center bolt valve covers and narrow body
"self-aligning" rocker arms.
- L31: Flat or Roller Tappets from GM?
Before beginning to swap heads, consider the chamber volume and
what the consequences will be for compression. The replacement
L31's are shown as having a -13cc dished piston
Compression Ratio : 9.0:1 w/ 64cc heads
Compression Ratio : 8.3:1 w/ 72cc heads
.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
a single rear main seal and comes with provisions for a roller cam.
.
Thread Starter
Intermediate
Joined: Nov 2006
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The engine is a chevy 350.I want to use the crossfire setup.Now is there something I can do to the heads to make them work with this engine so i dont get the power loss that you are all talking about.This swap is only for about a year.This should give me the time to build my old engine.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
I believe an inexpensive route to go would be to track down some
23º iron heads with 64cc or smaller chambers.
Alternatively, you might look for some D113 aluminum heads from the
later L98 engines. These have 58cc chambers, but because they are
aluminum, heat dissipates more rapidly. Performance might be
a bit lower than that from 64cc iron heads. The D113 are beginning to
sell for more modest prices than in the past.
The Crossfire is a drawback in this case in the sense that TPI engines
could be adapted to the L31 longblock thorugh a swap to a readily
available lower intake base that fits the existing Vortec head.
Still, considering that your new engine was free, you have a little
budget room for heads presumably. Suitable iron heads should not
cost too much and if the bottom end is in good shape, you may wind
up with a package that you will be happy with for some time to come.
.
23º iron heads with 64cc or smaller chambers.
Alternatively, you might look for some D113 aluminum heads from the
later L98 engines. These have 58cc chambers, but because they are
aluminum, heat dissipates more rapidly. Performance might be
a bit lower than that from 64cc iron heads. The D113 are beginning to
sell for more modest prices than in the past.
The Crossfire is a drawback in this case in the sense that TPI engines
could be adapted to the L31 longblock thorugh a swap to a readily
available lower intake base that fits the existing Vortec head.
Still, considering that your new engine was free, you have a little
budget room for heads presumably. Suitable iron heads should not
cost too much and if the bottom end is in good shape, you may wind
up with a package that you will be happy with for some time to come.
.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Slalom4me
I believe an inexpensive route to go would be to track down some
23º iron heads with 64cc or smaller chambers.
Alternatively, you might look for some D113 aluminum heads from the
later L98 engines. These have 58cc chambers, but because they are
aluminum, heat dissipates more rapidly.
23º iron heads with 64cc or smaller chambers.
Alternatively, you might look for some D113 aluminum heads from the
later L98 engines. These have 58cc chambers, but because they are
aluminum, heat dissipates more rapidly.
Here is a plan worth considering. If the free engine really has pistons with a 13 cc dish, the stock '84 heads with 76 cc chambers will put the compression ratio in the crapper. The '84 piston is a flat top with a 3 cc valve clearance trough that produces a 9.00:1 compression ratio with the 76 cc iron heads. A set of 128 or 113 heads aluminum heads with their 58 cc chambers will yield a reasonable compression ratio. Next year when you build the stock engine, you can take the aluminum heads into account when you select pistons and continue to use them on the fresh engine. That way you circumvent having to use those "boat anchor", 1984, cast iron, 624, heads.
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by tiffsc4vett
ok now will my cross fire set up work with 23 iron heads.
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Thread Starter
Intermediate
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I should be able to find the heads in my old mans junk yard. What did they come on,We have some firebirds and some trucks around that have 350's in them.
So im looking for heads with 64cc or lower
So im looking for heads with 64cc or lower
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Yes, and 1986 and older if they are iron. You will be very lucky if you find any heads with 64 ccs or less. Buying the aluminum heads, as I suggested, might be the best way to go for now and for after the rebuild.
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