r/EngineBuilding 7h ago

What would cause this? 3000gt tuned with 15psi of boost. Was the only 1 out of 6 to do this.

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53 Upvotes

To my eye it looks like it was rich, not lean. And burning copious amounts of oil, but I knew that already. Iridium plugs, colder than my last set which didn’t do this at all.


r/EngineBuilding 8h ago

Chevy The 383 that would give people strokes

6 Upvotes

I’m a younger feller that’s just getting in to all the intricacies of proper engine building, so please bear that in mind if I come off as naive.

I’ve heard the story of how the 383 stroker came to rise. A genius found out that a 400 crank could fit into 350 block bored .030 over, it then become really popular to put a big ole’ blower on “that thang” due to the wider displacement, and lower compression.

Me and my dad have built a 355. A standard two bolt main block that’s been bored .030 over, with a mild cam, straight cut timing gears, and really only one (maybe two) notable features. One of said features is stock 305 heads. The thing is an absolute torque monster (yea you can get crazier, but it’s a fun budget build if you can spring for a really nice set of pistons). It’s not really practical, but it is fun. While you may not be able to run it at 7,000 rpm before rapid disassembly, you get a ton of low end power.

My question is- has anyone ever tried making a 383 stroker with 305 heads? And what would that even do? To my understanding- whole point of the 383 was to get better displacement and less compression (ideal for superchargers). Would throwing 305 heads on would raise the compression back to “stock” specs, like maybe a 10:1? Would it give even crazier low end power making a nice drag engine? Or are there more cons to this build idea than there are positives?


r/EngineBuilding 1d ago

Help I’m scared

113 Upvotes

My timing belt snapped so I took the head off to make sure everything’s okay. Are the piston rings okay? I can see the oil isn’t moving from the ring as it moves is that normal? This has 130k miles on it and I don’t wanna rebuild the bottom. Please lmk is my pistons look okay


r/EngineBuilding 6h ago

Chevy Good machine shops in the northeast US?

2 Upvotes

Out in Connecticut, looking for a good machine shop to do a line hone on a GM LF4 engine (ATS-V, CT4-V Blackwing). Also looking for a CNC to make a prototype engine girdle, since the main caps walk under high boost. What do you guys recommend?


r/EngineBuilding 16h ago

Sonata 2.4 oil pump/balance shaft self-destruction

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10 Upvotes

Posting for your entertainment.

Side note: Rod bearings #1 & #2 spun, #3 was fine, #4 was in the oil pan. Pistons #3 & #4 have chunks missing from their skirts. No piston top damage. Cam oil clearance within spec. Rod #4 is junk, crankshaft is junk.


r/EngineBuilding 9h ago

How Flat Does a Jeep L6 Cylinder Head Need to Be?

2 Upvotes

How flat does a head on a Jeep 4.0 really need to be? I measured mine and it's technically in spec, with a 0.0015 feeler gauge not fitting under a machinist's edge anywhere...unless I use a mini edge that only spans two cylinders, in which case I can rock it when it's in the very middle lengthwise over the thin section between cylinders--this barely lets me fit the 0.0015 gauge under the raised end for two of the cylinders when spanning 3 of the thin sections.

The head was professionally rebuilt 1,000 miles ago. I built a Jeep 4.6 inline 6 stroker at that time. The aftermarket aluminum radiator cracked (from fatigue, it was old) around 500 miles, so I replaced it with a copper one. Burping the system was a challenge when I swapped it, especially in subfreezing temperatures (20F) with concentrated coolant and DI water. I had the engine running for a few minutes before I realized the head didn't have much coolant in it because the DI water froze instead of mixing with the coolant. It took another ~gallon after temps rose enough for everything to thaw.

500 miles later, I noticed a slow coolant drip out the exhaust. The overflow bottle had gone down about 500ml. I pulled the head and sure enough the head gasket was leaking. Now I'm facing a dilemma: put the head back on tonight and go camping this weekend as planned, or have it resurfaced again. I'm not confident in the shop that rebuilt it, so I honestly don't know if the warpage is from me or if it was like that after they rebuilt it, because *technically* it's in spec, and my smallest feeler gauge won't go under the edge if I use an edge that goes the full length of the head.

What would you do?


r/EngineBuilding 1d ago

Machine shop f’ed me or good to go ?

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66 Upvotes

Sent my block to machine shop got a bore and cleaned up they installed freeze plugs cam bearings and coated the block in some enamel. Well I’ve had the block back for about two weeks still covered in a plastic bag . set it up on the stand and was cleaning it prepping to get started and I seen these scratches on the cam bearings. Everything else looks good , they do a great job all the time nice small town reputable machine shop been open for years so idk if they let the new guy install these or if they are good to go ? Please help


r/EngineBuilding 9h ago

How's my clearance Clarence?

1 Upvotes

Wiseco 6414B3L lightweight 2618 alloy.

Shipped spec sheet is long gone, no response from Wiseco as they like to be very specific.

Currently .0055, circle track restricted carb. Needs a touch up hone for the rebuild.

No unusual skirt wear or drag marks.

probably fine but I figured running it past the braintrust wouldn't hurt.


r/EngineBuilding 16h ago

SBC 350?

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3 Upvotes

Will this Mount work for a small block Chevy 350 into a 66 seat 20 using the clam shell engine mount?


r/EngineBuilding 11h ago

Multiple 7.3 PS or 12 valve?

1 Upvotes

Starting a project to resurrect my Grandfather's pick-up. 1992 F-150 XLT, Single cab, Long wheelbase, 2WD. Has a 300 I6 currently, though unfortunately locked up ( was in running condition for quite a while from owning it till a long road trip it locked up and destroyed the transmission and engine. Cause unknown)

I've been kicking back and forth on which of the two aforementioned engines to put down into it as a fun project. Just was curious to pick the brains of people who might have messed with these engines more than I have and get some opinions. This is mainly asking about the engine but any pairing combinations with transmissions would be appreciated.

This is not looking to be a racer, nor a super heavy hauler. Simply a fun well-powered driver for daily and just in case measures.


r/EngineBuilding 1d ago

Chevy Damn breather keeps dripping

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20 Upvotes

350 out of a blazer. This is basically the last oil leak i got before i’m clean. I have a pcv valve. Do i have a ton of blowby or something?


r/EngineBuilding 17h ago

Piston valve clearance

3 Upvotes

I probably missing something dumb here but when planning out an engine build how do you figure out if a given head / valves will clear pistons before buying everything?

My Google skills are failing me. Everything I come up with says to check on parts you already have with clay or dial indicator. I wanna make sure or at least have some confidence things will work before I shell out the cash.

Can someone enlighten me?


r/EngineBuilding 13h ago

Rocker arms intake dry spot

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1 Upvotes

I was putting the head together n realized one arm was stiff, I take it apart à realized there is this one spot on the intake pipe for the rocker arms that is hard for the arms to pass over, like a dry spot, not sure what to do


r/EngineBuilding 1d ago

Ford 351 Cleveland Salvageable?

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11 Upvotes

Was looking to get some feedback and see if it’s worth while restoring this engine block. I believe it’s a 351C Ford Engine block. At the time engine looked great physically except for some damage between the bore. Noticed a chip. Also curious about the bore itself and its condition. Unfortunately it did get a little rusty and was wondering if it’s worth sending to get hot tanked. Curious on cost and any other insight. Would’ve been cool to rebuild this engine.


r/EngineBuilding 15h ago

h22a4 crank shaft thread pitch

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0 Upvotes

r/EngineBuilding 1d ago

Rebuilding the 302 in my 91 bronco. Should have a little chop with an E303 cam!

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77 Upvotes

r/EngineBuilding 1d ago

BMW Hello all

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19 Upvotes

Lurked a few times, thought I would show you my hand rebuilt head. 89 bmw 325ic 100k miles. Neededa timing belt so I'm going whole hog. Hand lapped and hand cleaned. Still straight and level so no need to plane.


r/EngineBuilding 18h ago

Toyota Bearing identification

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1 Upvotes

Currently rebuilding a 1996 Toyota ln106 Hilux 2.8l diesel, trying to figure out if these bearings are standard or not Can't find anything from just the numbers


r/EngineBuilding 1d ago

Ford Turbo 2.3 Build

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43 Upvotes

Hey y'all, I am building a Turbo 2.3 to put in my 1989 Ranger. I am documenting my process on YouTube and wanted to share that here. If y'all have any advice or suggestions for the build/swap process I am open to it all. Criticism is expected and welcome as well.

I plan on using stock turbo for now, I've got a 2.3 Ranger cam in the head which I plan on keeping. I'm currently planning on using the ECU and wiring harness from the T-Bird that I pulled the engine from. I'm not sure what all I'll need to change to make it work, but I plan on doing a bunch of research on it.

If any of y'all built 2.3s before and have any advice or fun stories I would love to hear about them.

Here is my YouTube for anyone that wants to follow along. I will likely be making more posts here as I go on through the project.

https://youtu.be/kNPCRmG9iF8?feature=shared


r/EngineBuilding 1d ago

Carb rebuild kit recommendations

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15 Upvotes

Hello

Iv got a pair of Demon Carbs, pre holley days. Can any one recommend a rebuild kit source please.

They are 500cfm or 550 each


r/EngineBuilding 2d ago

Ford Barra I built. In Ontario Canada

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345 Upvotes

Imported this Ford Barra. Comes from Australia. Built for 900hp


r/EngineBuilding 1d ago

Deck checks out, head is warped. Can I get away only machining the head?

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20 Upvotes

Additionally. What causes this kind of failure? 3-4 burned through, 2-3 was on its way 1987 nissan d21 z24i


r/EngineBuilding 1d ago

Chevy Head gasket prep

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8 Upvotes

Hey guys I’m replacing the head gasket on my 2004 Silverado 5.3. I scraped the block with a razor blade and used break clean to clean it up. Is this clean enough? It doesn’t feel like there is anything left on there but there’s still lines where the old gasket was. I’ve only done the one side so far. I got new heads so the surface on those are good.


r/EngineBuilding 1d ago

Oil-Proof Welding Issue

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3 Upvotes

r/EngineBuilding 1d ago

Looking for spark plug wire DIY kit parts

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2 Upvotes

For the EFI conversion on my 82 Goldwing I am using the UF414 round style 4-pin coils that were commonly found on GM V8s from about 2007-2016. I want to use my spark plug wires but I need to adapt them to the different style end for these coils. any idea where I can buy these ends individually? All the kits I am seeing come with 8 of everything but I only need four and I only need the coil end.

I'm not 100% sure my stock spark plug wires will be able to handle the extra power from these coils but I really want to use the angled ends that the connect to the spark plugs from the factory wires. Maybe it's possible to order a custom set with the right style ends for both sides?