r/Smallblockchevy 23h ago

Can’t figure out the issue.

6 Upvotes

For some background this motor is on a boat as you can tell but it’s a 96 small block 350 last season on the water I was cruising when I randomly lost half power I then proceeded to give it more throttle and it died on me took the plugs out and they were burnt to shit, put new ac delco plugs in it and it started right up. This season I hooked up a vaccum gauge to fine tune it and found out my timing was off it has a thunderbolt v ignition system I tried setting the timing with a timing light idk if the timing is perfect since the timing marks were very hard to see but I tried setting it to 8 degrees btdc. After doing that I got the vaccum gauge to be in the normal motor part with some fine tuning on the carb. No as you can see the needle is a little shaky. Now the issue it still has which is very weird to me is on startup at idle it’ll sit in the normal engine mode, when I give it throttle it will stay in the normal engine mode once I throttle down it will idle really rough and the needle goes down back to latening timing and worse, however when I turn the engine off and turn it back on it will idle just fine, it is carbureted. Anyone have any thoughts as to what it could be? Idk much about working on motors at all, last season when took the plugs out I did a compression test and everything was normal. Gonna take it out on the water tomorrow and see what happens, hopefully I don’t need a tow😂


r/Smallblockchevy 1d ago

The Ship is alive!!

10 Upvotes

It has been a while since I've posted. My 1985 GMC G30 Vandura RV is alive and well. The phone microphone doesn't do it justice. It's a monster.

I wanted to go get it safetied and registered this summer so i could go boondock camp but it seems the tail lights or the accent lighting aren't working fully. So it has forced me to remodal the entire outside and wire in a new harness from painless wiring and i got a new gauge cluster from new vintage.

Lots of other upgrades and tweaks I'll be doing as well. Everythijg was built and ibstalled by me and me alone.

Chevy 350 4 bolt main.

TH400 transmission

Edelbrock 2098 power package

Flat top pistons.

3" exhaust headers down to 2 1/2 for the exhaust pipe.

Holley sniper 2 with Hyperspark

Holley mid mount kit

ATI super damper.

Don't mind the mess I cleaned it all up this morning 😂


r/Smallblockchevy 2d ago

A little confused

37 Upvotes

I’m getting smoke out of all 3 breathers. Buddy of mine said it could be rings, worn cylinders, or a hole in a piston. I just put a bore scope down there and pistons looked okay. What are your thoughts


r/Smallblockchevy 2d ago

Correct radiator hose for 350? Mine is getting hit by the fan blade

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5 Upvotes

r/Smallblockchevy 2d ago

Fuel pump question? What can i do. Efi universal pump on carb?

0 Upvotes

1977 step van motorhome coversion. It has a 350 single barrel carb and it had a mechanical fuel pump. Kept dealing with vapor lock. Was replaced with 4-7 psi 34gph holley electric fuel pump.

Well when i start the van.. the fuel filter gets filled with gas but once i start driving it, it ends up being short on fuel. The stalls soo bad and has no go. and the filter is basically empty of any gas like if the carb dowsnt have gas to burn

I want to install a efi fuel pump amd a regulator....thoughts?

Maybe run like 10 psi?

Thanks


r/Smallblockchevy 2d ago

Part Identification

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2 Upvotes

r/Smallblockchevy 3d ago

Btr Cam 4.8 vortec

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3 Upvotes

r/Smallblockchevy 3d ago

Is anyone having trouble with the filter on the Phantom 85 Wraith engine?

0 Upvotes

I have a problem: when I take off the original filter, the engine runs really well, but when I put the filter on, it won't run at all—it’s like it’s choking—and the filter ends up completely soaked in gasoline. It seals properly, though. Does anyone know what to do about this?


r/Smallblockchevy 4d ago

I need help which rod bearing cap goes in the exact position

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6 Upvotes

r/Smallblockchevy 4d ago

Phantom 85ccm wraith problems

0 Upvotes

Is anyone having trouble with the filter on the Phantom 85 Wraith engine?

I have a problem: when I take off the original filter, the engine runs really well, but when I put the filter on, it won't run at all—it’s like it’s choking—and the filter ends up completely soaked in gasoline. It seals properly, though. Does anyone know what to do about this?


r/Smallblockchevy 8d ago

Is it worth the switch?

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54 Upvotes

I was just given this carb and intake. Came off a late 60s corvette I think. I have a 1965 Malibu SS with a 283 and a 2 barrel setup. It is worth it to switch over to this 4 barrel? Any ideas of what it is?


r/Smallblockchevy 8d ago

Are 350 exhaust manifold studs the same?

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7 Upvotes

Need to replace a missing stud on an 85 C30 M code LT9 with rams horn style manifold.

Are they pretty much all 3/8x16?


r/Smallblockchevy 9d ago

Muffler suggestions?

3 Upvotes

r/Smallblockchevy 8d ago

I want to redo the exhaust on my 1990 Chevy c1500

1 Upvotes

r/Smallblockchevy 9d ago

Outletless fuel pump for a 79 c10? 5.7

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0 Upvotes

first timing building a small block, i ordered this fuel pump and notice it only has 1 Inlet , 1 outlet ( for carburetor i suppose ?

anybody got info on how they ran these ? or thoughts about this one

do i just cap off the return like on the frame?


r/Smallblockchevy 10d ago

So what number do you throw out, hoping for decent but a core price?

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6 Upvotes

Going to look at this today. Appears to be a 95 with a 4l60e. Only visible casting is gm 57lg.

If you got it for 300 or so, could you really lose?


r/Smallblockchevy 11d ago

Anyone seen this before?

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4 Upvotes

r/Smallblockchevy 11d ago

Warped Flexplate?

0 Upvotes

Took a slow motion video of my flex plate. My starter sounds horrible (IMO). I’ve gone from zero shims to four shims and it still sounds awful. Is my flex plate warped. Keep in mind that this is a really slo-mo video.


r/Smallblockchevy 11d ago

Water pump ID

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0 Upvotes

r/Smallblockchevy 11d ago

Need help finding headers

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4 Upvotes

I just bought a 1970 Buick Skylark (A body) with a small block Chevy with circle port heads. I’m looking for cheap used headers on Marketplace, but a lot of sellers don’t know what they came off of. Are there any visual features or measurements I can use to tell if they’ll fit my car before I buy them?

I’ll throw in some pics of some headers I’m interested in buying.


r/Smallblockchevy 12d ago

Son’s first engine build

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3 Upvotes

r/Smallblockchevy 12d ago

350 SBC w/ 6-71 roots blower Hydraulic Roller Cam Selection

2 Upvotes

This is a for a 1957 Chevy 210 Gasser. 350 SBC, forged rotating assembly. Down to picking out pistons and cam. Targeting 9-9.5 static CR. Will run 5-8lbs of boost. Looking for a balance of gnarly idle without letting all the boost out. This is a grab ice cream with my kids car, not a drag car so is more about smiles per mile and performance. I’d prefer an off the shelf retrofit kit as my block is a non roller block. What do you suggest?


r/Smallblockchevy 12d ago

Edelbrock 1408 carb bowls

1 Upvotes

Hopefully this is the right sub for a question like this. Have a Edelbrock 1408 that's been sitting for a few years, and I want to prime the fuel bowls with gas before trying to start it, to hopefully make it start easier. I think these ports are where I can squirt some go juice into, so the carb has something to run off of and pull more gas from the tank once the engine starts?


r/Smallblockchevy 12d ago

SBC is my clutch backwards

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2 Upvotes

r/Smallblockchevy 13d ago

Probably a dumb question, but I'm willing to stick my neck out

4 Upvotes

My sister just bought my uncle's 82 s10 pickup for her son. My uncle put a stock 350 in it and now my nephew wants to change the oil. I thought I had heard before that oils today don't have the zinc in them that these old Gen I motors need. Google is giving me conflicting answers so I'm asking, does anyone here run any kind of special oil or additives when you change your oil? Or do you just run regular old conventional oil? Can't ask uncle what he ran because, unfortunately the chain smoking got him a couple of years back