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Old March 5th, 2013, 06:49 PM   #1
skruba
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Blown motor What would you do?

so the 5.7 in my 95 chevy k/2500 was knocking pretty hard so it is time for a motor for this sucker. My question is what would you guys do rebuild the motor or just throw another 350 at it. The truck is pretty much stock 38s with a lift...I only use the truck to play run down some trails and have some fun in the mud. now from what i have done with research i have read that year was an odd motor and hard to come by? help please from anyone
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Old March 5th, 2013, 07:12 PM   #2
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Old March 5th, 2013, 07:30 PM   #3
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Old March 5th, 2013, 07:31 PM   #4
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Old March 5th, 2013, 07:38 PM   #5
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Old March 5th, 2013, 07:41 PM   #6
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Old March 5th, 2013, 07:49 PM   #7
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Old March 5th, 2013, 08:13 PM   #8
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Dificult to find a good used TBI 5.7 anymore. Rebuilding is not cheap anymore, but you can get crate motor for a decent price. This may sound strange, but have you considered a 260 hp GM 350 with the old style heads? It has a better cam and better heads than a TBI 350, you would just need to modify the intake so the center bolts would line up - I have done this and it works great. I do have extra intake manifolds that I have modified laying around. Would part with one cheap!
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Old March 5th, 2013, 08:19 PM   #9
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Old March 5th, 2013, 09:35 PM   #10
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a cummings would be great but i dont wanna get that involved. does anyone have any motors laying around? I found a tbi 5.7 that i know is a good motor from a buddy with new valve seals with 100k for 800.00 any other ideas? my buddy just did a rebuild on his vortec and hes into it for around 2200.00 with some slight mods
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Old March 5th, 2013, 10:24 PM   #11
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gm crate motor.
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Old March 5th, 2013, 10:26 PM   #12
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Send it to accurate engines, in west michigan. They'll rebuild yours, or make it a stroker for a good price.
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Old March 5th, 2013, 10:53 PM   #13
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Send it to accurate engines, in west michigan. They'll rebuild yours, or make it a stroker for a good price.
or not
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Old March 6th, 2013, 03:57 AM   #14
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Send it to accurate engines, in west michigan. They'll rebuild yours, or make it a stroker for a good price.
That will last 3,000 miles if your lucky, and then you have to try to deal with there awesome customer service!
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Old March 6th, 2013, 06:12 AM   #15
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Originally Posted by skruba View Post
a cummings would be great but i dont wanna get that involved. does anyone have any motors laying around? I found a tbi 5.7 that i know is a good motor from a buddy with new valve seals with 100k for 800.00 any other ideas? my buddy just did a rebuild on his vortec and hes into it for around 2200.00 with some slight mods
How involved is swapping in a Cummings? Never heard of it done before. Never actually heard of that engine either
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Old March 6th, 2013, 06:23 AM   #16
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Good luck finding an engine that is 15+ years old in the junkyards that doesn't need refreshed. Would probably be easier / cheaper to buy a reman.
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Old March 6th, 2013, 07:43 AM   #17
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Here is one listed

Chevy 350 TBI price drop - Great Lakes 4x4. The largest offroad forum in the Midwest
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Old March 6th, 2013, 08:15 AM   #18
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Quote:
Originally Posted by Iggy View Post
Dificult to find a good used TBI 5.7 anymore. Rebuilding is not cheap anymore, but you can get crate motor for a decent price. This may sound strange, but have you considered a 260 hp GM 350 with the old style heads? It has a better cam and better heads than a TBI 350, you would just need to modify the intake so the center bolts would line up - I have done this and it works great. I do have extra intake manifolds that I have modified laying around. Would part with one cheap!
I have done this in the past and it usually ends up with a cel and less power then the tbi 5.7 in my opinion. In my experience the gm tbi motors dont like cams that wernt made specifically for them.

Edit I have not used this exact crate motor so I cant say how the ecm likes the cam profile it uses. I have put several non tbi cams in tbi motors with less then great results.
This is a great deal on a crate motor and it makes more power then a 5.7 tbi. The horse power doesnt tell the whole story, I would look at the torque curve more for a heavy truck.
While they make 260+ with a carb it may only make 160hp if you have a cell and the ecm is always pulling timing.

Last edited by bdd1469; March 6th, 2013 at 08:31 AM.
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Old March 6th, 2013, 08:23 AM   #19
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I like to build motors so I would build a nice 383 out of your 350 using a cam made for large cube tbi motors. If it's just a mud truck I would build a carbed big block for it and put a turbo 400 trans behind it.
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Old March 6th, 2013, 11:23 AM   #20
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The cam in the 260 hp crate motor is the same stock cam that came in the 350's and 400's for years (the one in the 290 hp crate motor is totally not computer friendly). The TBI cam by comparison is terible. While the standard small block cam has 193* intake duration, the TBI cam has 179* intake duration. In comparison an RV cam has 204* intake duration. The reason the TBI cam has such low intake numbers is because the heads flow is terrible, so by keeping the cam duration low the seat of the pants feel is great, but the real power is not there.

I ran that set up in a 1989 K1500 and was very happy with it. Great acceleration and drivability, and averaged over 20 mpg on hwy, never had a cel. You could also feel there was at least an additional 1000 rpm usable range becasue the heads breathed better. The 260 hp GM claims is a Gross Rating (think 1960's) and not a Net Rating including all accessories like motors were rated since the early 1970's. I have also tried to run an RV cam in a TBI and you are correct - it did not like it. Part of the reason is the lobe seperation, if you increase the lobe seperation of an RV cam to 114* it would run fine. The TBI cam is ground on a 110* LSA and the general small block cam is on 112LSA - As you increase the intake duration you also need to increase the LSA to keep the computer happy. LS motors cams are ground with a 122* LSA for that reason.
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