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My 1970 is a few weeks out from having it's driveline completely updated. Going in is a fresh 428, a rebuilt M20, Yukon LS and 3.55s. I'm doing a CVF serpentine conversion on the 428 along with DUI HEI, DUI 1 wire alternator, Eddy carb, FlowKooler pump, Carter fuel pump, etc. So the 400 that's in the car will be coming out complete from oil pan to air cleaner. She still runs strong although the Quadra Jet and points both need some TLC (or replacement.) I didn't bother after buying the car a couple months back since I knew it would all be updated in short order... The motor has an Edelbrock Performer intake and a mild cam (don't know the specs... just going by the idle). It's not consuming oil or smoking and has 40psi of pressure at idle / 60 under load. Runs cool at 160 (new Griffen rad is helping with this.) The motor also has 6X heads into stock manifolds.

Anyways, the shop I bought the rebuilt trans from is taking my M20 back as a core and giving me decent money for it. Now I'm trying to figure what to ask for the motor? I know it's an unknown so we don't know the condition of the internals... But I'm just trying to figure what it's worth if I pop it on CL or FBM? I'm not looking to squeeze every last penny out of it. I just don't want to scrap or leave behind a decent 400. I haven't looked at the date code or casting number but it's a WT block. Any thoughts or advice on value? Thanks in advance guys...
Is an M20 going to up to the task of that motor? Is it getting beefed up?
 

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I believe the M20 will be fine. I think lots of times folks get hung up on ratings. Same happened with my TH350 I had behind a 400 small block in my 69 Camaro back 30 years ago. I had that motor really built and threw a 140 shot of nitrous on top of that. Ran 11's and I beat the snot out of it every weekend on the street. The only thing I ever broke in the driveline was a rebuilt 8.2 GM posi after almost 4 years of this abuse. Now, that's anecdotal evidence and I may grenade this M20. However, after returning the old one to the guy who built the replacement, I'm only out $850. So, if that $850 turns out to be money spent poorly, I'll get on AutoGear's waiting list for a wide ratio M22 and pony up the $2300 they want... I guess time will tell... 🍻
Gotcha, and if you don't have big sticky tires and traction it should be ok, you're probably not racing it every weekend either, but if it goes put in the Tremec TKX (y)
 

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Oh, so many ways to spend my money...LOL. Now to get the 400 sold and try to recoup what I've already spent. I'm up to the point where I have about the same into the car as all my current upgrades and mods...
Welcome to the club, you're now an official member, but when you get the high signs going down the road or you mash the go pedal it will all be worth it :D
 

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Okay, but seriously, aside from the fact the everyone on Earth knows Im looking for a 400, some arent very good because they were weaker casts, so yes, find out what you have!

That being said, if you're close to someone who wants it, then it's great... but not many people will spend much on an unverified engine, especially if it's far away. There's very little protection or guarantee when buying a used engine, so its a leap of faith for the buyer... better if they know you.
I thought you had a 400 🤔
 

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They didn't put all the hinge bolts in correctly because it makes the door harder to square up. That is what took me so long last night. Yes, there is plenty of things that are wrong with the car and yes, there is a lot of "while we are in there" going on but I'm having a (mostly) good time. I could have just bought a modern Camaro or Challenger and called it a day but that's not what I (we) wanted. Since my 69 Camaro I've owned any number of sports cars, ATVs, Sleds, RVs, a boat, PWC, etc. I had been purposely putting off skinning my knuckles again for as long as possible and part of me thought it would never happen again. But the wife pushed and I jumped and here we are. Right back were I was at 19 with that POS Camaro... starting from scratch...

I think the thing of it is for me is... I'm a very particular person. I am not starting from scratch because I'm trying to save money. I know all too well that it costs more to build than to buy. But for me it comes down to personalization. I didn't want a numbers matching car that was done or even a restomod done to someone else's taste. I wanted my car. (Kind of like building a house vs. buying one.) Because of this, I'll have nights like last night but in the end, that's what I signed up for and hopefully the end result will be worth the price of admission... 🍻
Preaching to the choir, sounds exactly like my story but less toys. I sold my two goats for a nice downpayment on a house and put the thought of cars away and also thought I would never have one again. We put our time and money into kids and our dream of buying property and building our dream house before our oldest started school...mission accomplished but then it was doing everything to the house by myself i.e. landscaping, patio, finish basement, build bar...for medicinal purposes 😉 Then the dreaded college tuition of two which strapped us for 6 years, but I never lost the bug. I would look at cars sometimes and freak out at the prices and thought I'll never have one, I would feel selfish spending that much on me but I married an angel that said go for it once the last tuition bill was paid, then I found this car exactly 30 years from selling my first two. She said you gave up the cars you built and loved for us and put everything into the house and kids...but I still wasn't sure and almost got sick when I won the bid ! Little did I nor her know it was just the entrance to the rabbit hole 😀
 

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Does the fact that it's complete from pan to air cleaner with all accessories/brackets/pulleys and the fact that it's currently running help?
Like I previously mentioned I must have found a sucker or a guy with money because I got 2300.00 for a 1970 small valve head 455 with a rod knock! It included the p/s, alternator, pulleys, flywheel with worn clutch, a Chinese HEI dist, new stock chrome vc's but no carb and some more parts but stilll.
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Forgive me but I went back to the beginning of your thread but don't see anything, why did you have a 428 built instead building/stroking the 400 that you're going to sell ?
 

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Ah ok, makes sense and maybe I missed that. When my motor went south I had sticker shock too, if I wanted 500hp it was around 15k and that was in 2018! So when I saw this Butler 461 on ebay for 8k ( negotiated it down to 7500.00) with receipts and dyno sheet I jumped on it. I feel very fortunate to have found it, right time right place 👍
 

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Holy!!!! That's a steal! Congrats on that find man... I was looking at a full Butler build too but that was pushing 20k. I got the 428 for 5k. No, it's not a 600+HP monster but that other 15k can paint the car at some point... Or buy that square body GMC the wife keeps asking for...
You got it, it dynoed at 472hp 526tq and the guy decided he wanted 600hp for his Firebird and didn't install it. I changed out the intake to a Performer RPM, put an 850 Quickfuel and 1.65 rockers so maybe I'm close to 500hp and believe me it's scary enough. I have big drag radials and lift bars but still can't keep it straight. Big numbers always sound good at the car shows and I'm guilty somewhat but I'm perfectly happy with it.....unless it doesn't perfom well at the track 🤣 I also had to put a ton of money into the driveline to support 500hp like a 3K trans, 500.00 driveshaft a 2100.00 rear end. So down the rabbit hole deeper and deeper...my wife works 32 hrs a week and tells everyone it's for my car....I plead guilty your honor and hope the court has mercy on me.
 

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Exactly, and up until the last few years when my back went out I did everything myself on the house, neighbors would spend 50k on there basements or paver sidewalks but maybe that's why my back is not great so I have to start writing checks now. Also we were smart with our money and didn't live beyond our means since we've known each other but people don't see that and we've lost friends over it. You mentioned the Ford your wife wants I think you should suprise her with it trust me. I felt so guilty I found her a 2013 purple Challenger that she has dreamed about for a Christmas suprise. I call it the purple IRA but I have no more guilt and I have never seen her so happy and cry so much, not even at our wedding 😄 of course there's the shoes and close that come every week...and a few diamonds and the beach once a year but I'm sure I'm still ahead 😉 Well I've certainly derailed this thread, sorry.
 

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I've got my FB listing written up with some pics. I guess I could start it at $2500 and see what happens. I'd like to take a better video than the one I have. It's fine but I can hear fan noise more than the engine.
Here's something Idk if you thought of, what if there's a problem with the new 428 and you've sold the 400 now you have nothing. What's the machine shops warranty and do they cover a motor you installed? You said he's going to run it on the stand, I would be there and video it, is he breaking it in too? Sorry to be a pessimist but we had a member solar68 that had a problem with a new build last year. Just a thought that maybe wait and see if everything is good to go with the 428 before you sell the 400.
 

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It's warrantied for a year, and yes, he's breaking it in at his shop. He wouldn't warranty it if he wasn't the one to run it in and break in the cam. Yes, it's warrantied through him despite being installed at an off site shop. He is a machine shop only and doesn't do R&R. The shop doing the R&R actually works with him frequently on projects like this. So, they are even coordinating pickup up the motor for me and getting it set to install before I bring in the car. I'm not too worried about something going wrong. Even if it did, I wouldn't drop the 400 back in for the time being. I'd wait for it to be fixed...
Sounds good, I thought you were installing it sorry. Do they have a dyno? And when do you think the switch will happen?
 
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