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I've had about a teaspoon worth of metal grit and shavings come out of a freshly machined block that is supposedly "100% clean, ready to go". I almost believed him and assembled it, but my OCD took over and I had to be sure. I'll never skip it, no matter what they say.

I like the off white, shows body lines a little better I think.

First run cleaning taps through all the threaded holes. Then remove every plug, scrub every passage with Tide and hot water using a new engine brush kit. Rinse and repeat until the brushes come out clean. Then blow compressed air through all passages until no water comes out. I like to finish up...

Would take quite a bit of power to make any 400 fail IMO. I think any 400 block that has good cylinder walls is a keeper.

About the same time mine was cast.

Thank you that's the date...couldn't remember exactly.

And here's an interesting document...they put 400s into some '71 Newports. Would be fun to find one of these, watch the puzzled looks from vin readers.

I've always heard blocks cast before Dec 11, 1971 are winter blocks with the thick webbing. That's no guarantee that it will sonic test well, though. Would hate to spend alot for one and find it has thin cylinder walls... I do have one tucked away that's been cleaned, mag'd and sonic tested...

True, it could be some strange flange and bolt pattern.

If you can buy it cheap like $100-150, get it for the crank and misc other parts. More than that, pass.

Still a mystery why all the block casting number lists don't show it. Maybe it was one incomplete list, then everyone copied it.

There were a few different casting numbers used on 400's. But that is strange that it's an 830 casting and a 400...every list I have saved shows that's only 440.

Backfire bent the throttle blades a little? Now it has a gap and higher idle?

Shooting to make over 800?

Very nice, can't wait to see some runs :thumbsup:

That would be a '64 Max Wedge, kinda doubt it.

I'd like to solve the puzzle - It's "2406516"

I guess I'm a bit confused...which competitor were you in that? The only Idaho shop I see is LaRoy?

I appreciate the work you put into your research, and that is one stout 470 for sure. Would love having an identical piece for my Barracuda.

Your best improvement will be headers, but adding intake/carb/cam will really wake it up.

'68 A body 383 was 300 hp, due to restrictive exhaust. Slightly more than '67 but still less than equivalent B body 383-4. Totally agree, love the Street Dominator on B and RB.

The TF heads should definitely help get you there.

I like big block A bodies but have to agree, start with the 318 and learn the basics. Meanwhile keep that 383 oiled and wrapped up in the corner.

Great car for the swap - it's practically done.

I bought one of those huge aluminum drip pans, carefully position it where I think it will drip, then it drips just outside of it.

516 heads have slightly smaller intake ports than later heads. But that may not be a bad thing, because it might help a little with better low speed torque from intake velocity, or it may not. But one thing you will gain is a slight bump in compression. I say go for it.

x2 Was gonna say scrap price on up to $50 each, depending on how scaly they are.

Looks like the aftermarket picked it up - several Corvette parts suppliers have the entire assembly: Corvette Air Cleaner, Big Block, 1966-1972 | 64239 Same base, if you can see the bulges for the Holley bowls then that's it. Edit: Found a source for just the base...

Don't cut your hood - get a GM air cleaner base part # 6422188. Been there, done that 25 years ago. Search for base for 1970 Corvette LT1 350/360hp, or any 396/375hp car. Several GM cars with a dual feed Holley had that base, and it is contoured to be Holley carb specific.

I just posted a pic of my 440 with Holley SD intake, Holley 850 dp carb, and 14 x 4 (I wasn't remembering correctly, I had a 4" element as you can see in the pic) filter that fit under the flat hood of my Barracuda, and I explained what I used to achieve it. I also ran a nitrous plate under the...