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FWIW.... the photo here is of the coolant in a /6 that was just rebuilt 700 miles ago. Nothing wrong, just that it has dirtied up pretty quickly. This engine had a ton of sludge in it from setting with little driving for years with no real work to keep the cooling system clean. During the...

- 225 /6, original 52 year old engine - Occassionally has a knock that sounds very much like a rod knock on start-up that quiets down as soon as the oil pressure light goes off; happens maybe 1 out of 4 times at cold start; never seems to happen at warm startup - A few days ago, this knock...

For those of you with older /6's, here is an example what happens to the timing chain as it wears. The first pix is of the old one and you can see all the slack hanging below. The 2nd pix is of the new replacement chain set and the slack is minimal. The chain slack/wear can be judge by...

This info post is for guys with older /6's that have been sitting a lot for years. There is probably not much here for folks with rebuilt engines or for the 'old hands' here. My son and I have a been working on getting a /6 running better for a few months. This 52 year old engine was run a...

Well here is a new thing to muse about....Chocolate colored soot from my /6's exhaust. Here is a picture that gives a good color rendition on my computer; the exhaust soot on the driveway gravel is a dark cocoa color instead of the usual flat black that it showed before. This chocolate sooting...

I have run full synthetic oil for years in street cars and racing (Mobil 1), and have always had some impressive results: Fuel mileage improvements, cylinder bores with the original hone marks and no ring ridge after 250k miles, race engines surviving for a 5 minutes of minutes at full racing...

Engine is a 225 slant 6, original 1962, 60,700 miles. Issue is a 'whirr' or vibration in the engine that cyles on and off at 1-2 seconds intervals; it builds up and dies off and then does that over and over. It seems most pronounced when warmed up, and the intervals are somewhat erratic...

I have read about the Super Six 2 BBL from the late 70's. But I was browsing through my old '71 Chilton's manual and checked the engine option codes for the Dart/Valiant. In '68-'69 there was a 'Special Order 6' in addition to the 170 and 225, and in '70 there was a 'Speical 6'. So what is a...

So I read a lot of good stuff here about using Marvel Mystery Oil or SeaFoam to get the gunk out of sticky valve giudes. Has anyone used Avblend as a preventative for this problem? Avblend is specifically for aircooled aircraft engines (like Continentals and Lycomings, not Subarus), and is used...

When did the hardened valve seats go into production in the slant 6's? I assume around 1970/71 as no lead was becoming available then. But I am not 100% sure. I'm asking so to know when to worry about ugrading the seats in a rebuild versus not. Tnx!