The Dodge Challenger Message Board

Here's an interesting article that answers a lot of tech questions regarding break-in procedures and why. http://www.mototuneusa.com/break_in_secrets.htm

My engine builder told me that he run the engine at 3000 rpm half an hour and another half to check possible leaks, check everything and tune it.
Then once the engine is into the car make the first oil and filter change at 100 miles adding a GM EOS additive.
Repeat the process each 150 -200 miles changing the oil, filter and adding the mentioned additive until 800-900 miles.
Once made this process the engine is ready to go to full throttle, but try to mantain the throttle and let the oil temperature raise to the normal range before get high rpm.

He said - The oil is cheap, not the engines -

Currently the engine have 1500 miles, the last 700 with the same oil and I will change it again for another 1500. At this time this engine don't waste the minimal oil quantity, counting that the engine arrived several times to the red line at the track.

I hope it helps too.

Sounds like it was expertly and meticulously broken in! I have heard your engine on your video posts Plum,,Sweet!! I think the GM E.O.S.,(Engine Oil Supplement is a very wise choice)!

interesting stuff eddie ive been reading his other articles i might just try some of his ideas on a hemi 6 ive got laying around & see what the difference is , ive got a few heads for hemi 6s so i can have a play without spending money
cheers ian

Yep, it was an interesting read Ian. I think the very worst thing anyone can do is to idle for long periods of time with any flat tappet camshaft, even if the engines been broken in. It's always low speed operation that breaks things. You have a Hemi Six? How cool is that! Those engines were designed by Chrysler of Australia to dominate the Holdens werent they? I always wondered what a Hemi-6 would be like under boost with it's canted valved splayed valve head? It seems it would be perfect for a turbo charger.

gday eddie yea the hemi 6 is pretty common over here chrysler australia canned the /6 in 1969 & introduced the hemi 6 in 1970 we had 3 sizes 215 ,245 ,265 ci ive never had 1 with a turbo but ive heard they go very well they are impresive enough stock you guys really missed out there , from what ive read they were originally going to exportt them to the US in 245,265 ,300 ci as lite truck engines but that fell through so they made the 215 instead of the 300 for the fuel consious buyer they did use the 245 in trucks but they were mainly just a passenger car engine
cheers ian

ianandjess wrote:gday eddie yea the hemi 6 is pretty common over here chrysler australia canned the /6 in 1969 & introduced the hemi 6 in 1970 we had 3 sizes 215 ,245 ,265 ci ive never had 1 with a turbo but ive heard they go very well they are impresive enough stock you guys really missed out there , from what ive read they were originally going to exportt them to the US in 245,265 ,300 ci as lite truck engines but that fell through so they made the 215 instead of the 300 for the fuel consious buyer they did use the 245 in trucks but they were mainly just a passenger car engine
cheers ian

Thanks for the interesting info Ian. With the media and politicians hammering about 'fuel crap' lately, the detroit engineers should bring that engine design back. They should pressurize it to 3 atmospheres and offer it to the power hungry public. With a DIS DI system and turbo it would make an easy 450-500 H.P. and provide 25-30 MPG

yes i think your right there eddie they could lighten up the block with modern metal & technology & it would be good on fuel for sure, wheels magazine did a test in 1974 of the base model valiant sedan 245 3 spd manual it got 38 mpg on the open road thats impresive for a 1700+ kg car i can still remember reading that article we just couldnt beleive itt but ive had a few of these engines now & they can be very economical butt not so good with an auto around town
cheers ian