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Old 12-09-2021, 08:38 PM   #26
truckster
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Re: Whats do you recommend

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Originally Posted by pjmoreland View Post
A stock L31 engine block isn't machined to support the use of a mechanical fuel pump, and the stock cam doesn't have a lobe for the fuel pump push rod. This means you'll need to add an electric fuel pump, which you would be doing anyway if you're switching to fuel injection.
Some blocks were machined for a mechanical fuel pump - mine was. The easy way to know is to look for a block-off plate. If it's present, the block was machined for a mechanical fuel pump. As far as the cam, you might want to change that anyway. I went with the GMPP HT383 cam.
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Old 12-09-2021, 08:42 PM   #27
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Re: Whats do you recommend

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Some blocks were machined for a mechanical fuel pump - mine was. The easy way to know is to look for a block-off plate. If it's present, the block was machined for a mechanical fuel pump. As far as the cam, you might want to change that anyway. I went with the GMPP HT383 cam.
Thanks for the info, we installed an L31 in my sons 86 k20, 9k miles later
he is going the l29 route. I called dibs on his engine already.

I will look into the cam you mentioned, what kind of rockers are you running with that cam.
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Old 12-09-2021, 08:47 PM   #28
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Re: Whats do you recommend

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M21 is close ratio like the M22. M22 was stronger version. M21 is slightly stronger then an M20 but nothing worth mentioning. And yes, I put one in a truck.
Me too! They still make 'em you know, with a nice selection of available ratios from close to wide.
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Old 12-09-2021, 08:50 PM   #29
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Re: Whats do you recommend

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Some blocks were machined for a mechanical fuel pump - mine was. The easy way to know is to look for a block-off plate. If it's present, the block was machined for a mechanical fuel pump. As far as the cam, you might want to change that anyway. I went with the GMPP HT383 cam.
Interesting. I have looked at a few dozen 96-99 trucks in wrecking yards, and I haven't seen one with a block-off plate yet. I've seen a few that had a partial push rod hole drilled, but it didn't go all the way through. I've seen the block off plate on 95 and earlier engines. What year vehicle was your engine out of? Is it an 880 block?
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Old 12-09-2021, 10:23 PM   #30
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Re: Whats do you recommend

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Thanks for the info, we installed an L31 in my sons 86 k20, 9k miles later
he is going the l29 route. I called dibs on his engine already.

I will look into the cam you mentioned, what kind of rockers are you running with that cam.
I'm running stock Vortec rockers, but I had earlier-model SBC valve springs installed on the heads.

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Originally Posted by pjmoreland View Post
Interesting. I have looked at a few dozen 96-99 trucks in wrecking yards, and I haven't seen one with a block-off plate yet. I've seen a few that had a partial push rod hole drilled, but it didn't go all the way through. I've seen the block off plate on 95 and earlier engines. What year vehicle was your engine out of? Is it an 880 block?
It's an 880 block. It came out of a 97 3/4 or 1 ton truck, if I remember correctly. It was originally fuel injected.

Oh, and if you're going to use a mechanical fuel pump, make sure you get a push rod with a bronze tip.
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Last edited by truckster; 12-09-2021 at 10:32 PM.
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Old 12-09-2021, 10:30 PM   #31
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Re: Whats do you recommend

Truckster, thanks for the replies.
I will see if I can browse through your install post for more info. maybe learn some tips or tricks
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Old 12-09-2021, 11:42 PM   #32
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Re: Whats do you recommend

Let me know if I can answer any questions for you. I did a lot of custom work because I wanted things to be a certain way.
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Old 12-11-2021, 09:21 AM   #33
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Re: Whats do you recommend

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Let me know if I can answer any questions for you. I did a lot of custom work because I wanted things to be a certain way.
Will do thank you
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Old 12-12-2021, 10:00 PM   #34
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Re: Whats do you recommend

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Exactly what I did. My 1970 C10 with L31-R , Holley 4 barrel and long tube headers gets decent gas mileage if I take it easy on it. I know because I did that once a couple years ago, lol.
I built it to have fun and drive like I'm 18 again, if I want to drive like an old man I drive the Corolla.
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Old 12-13-2021, 12:27 AM   #35
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Re: Whats do you recommend

I thought of getting a newer car, but that's not really my plan.
After much debate and crunching numbers etc etc I've decided to stick with what I have.
The plan for now is replace the trans (already ordered)
prep the L31 once it's out of my sons truck
swap over to a blazer or suburban tank an get everything ready for efi
not sure if I want to go the tbi or Max efi.
eventually get 3:73 gears for the axles.
I'm still young at heart ripe age of 43 and a gluten for punishment.
I'll get more pictures of my rig an do some sort of build thread.
The overall goal is to keep it a daily driver/camping
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Old 12-13-2021, 09:25 AM   #36
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Re: Whats do you recommend

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I thought of getting a newer car, but that's not really my plan.
After much debate and crunching numbers etc etc I've decided to stick with what I have.
The plan for now is replace the trans (already ordered)
prep the L31 once it's out of my sons truck
swap over to a blazer or suburban tank an get everything ready for efi
not sure if I want to go the tbi or Max efi.
eventually get 3:73 gears for the axles.
I'm still young at heart ripe age of 43 and a gluten for punishment.
I'll get more pictures of my rig an do some sort of build thread.
The overall goal is to keep it a daily driver/camping
If you have all the factory spider injection stuff. Holley may have a kit for it. Add a spacer between the plenum for better air flow, and the factory manifold is a decent performer.
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Old 12-14-2021, 12:52 AM   #37
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Re: Whats do you recommend

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Originally Posted by Ziegelsteinfaust View Post
If you have all the factory spider injection stuff. Holley may have a kit for it. Add a spacer between the plenum for better air flow, and the factory manifold is a decent performer.
I dont have the factory intake,
I have a Summit brand aluminum intake
Never realized how many aftermarket EFI kits are out there.
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Old 12-14-2021, 04:57 PM   #38
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Re: Whats do you recommend

I'm guessing "OF" was a typo and he meant "OD" (over drive).

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A what trans "OF"?
As for tires I'm running Dick Cepek tires, their AT versions
was not aware that either holley terminator could also control trans signal, might look into that. Every one I called has a ridiculous wait time for a rebuild trans, avg 5-9 weeks
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Old 12-15-2021, 09:57 AM   #39
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Re: Whats do you recommend

That makes sense now.
I've contemplated going some sort of OD trans, but that was just a thought
having to replace the transfercase itself along with the adapter an drive shafts.
I even contemplated doing some 4L60/4L80 swap but need to do more homework on them as far as the trans controls an what not.

Maybe some day I'll actually talk myself into an LS swap of some sorts.
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Old 12-15-2021, 03:14 PM   #40
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Re: Whats do you recommend

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I'm guessing "OF" was a typo and he meant "OD" (over drive).
It could mean overflow - I once had a trans that constantly puked trans fluid...
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Old 12-15-2021, 08:37 PM   #41
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Re: Whats do you recommend

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Interesting. I have looked at a few dozen 96-99 trucks in wrecking yards, and I haven't seen one with a block-off plate yet. I've seen a few that had a partial push rod hole drilled, but it didn't go all the way through. I've seen the block off plate on 95 and earlier engines. What year vehicle was your engine out of? Is it an 880 block?
I put a 99 vortec in my old 79 pickup. It was from a 3/4ton truck. It had the mechanical pad there, bolt holes machined and all. No blockoff plate, and no pushrod hole from the factory.
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Old 12-24-2021, 03:06 AM   #42
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Re: Whats do you recommend

I have had a 91 s10 for a little over a month now. It's my 14th s10.

I bought the 130k truck for $900(interior is nice) then threw another $1500 into it via a 45k 2.5 swap, a new windshield, and lots of general wear parts like clutch etc.
This is my kiss truck. No power steering, windows, etc. TBI 2.5, 5 speed 2wd. Just a simple reliable truck. I was going to buy a 91 5 speed metro to drive back and forth with this winter eventually building my own "elio" and am glad I waited.

The s10 has a low bed which makes loading stuff in it so much easier then my other trucks. So far I have had a 80's snowblower, 5.3, and the replacement 2.5 in the bed of this thing.
It is easy to work on and everything is cheap with a good amount of aftermarket support. A metro is nice but finding parts like taillights etc can be fun.

Things like insurance are a fraction of what my 2500hd cost. Parts for this little truck are also a fraction of my other rides. I bought new mirrors for $15 and new taillights for $30 to give you an idea. It was more for looks then anything.

I have had a 91 and a 92 3 cylinder metro. They were fun simple commuter cars. But I will wait to buy a third.
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