RavenSierra

I've got two pairs of heads here for the Mitsubishi 6G72 2972cc V6

One pair is the stock twin turbo heads, these produce 300bhp with 7psi boost in stock form

The other pair is from a MIVEC (VVT) engine, these make 270bhp in naturally aspirated form (where the turbo heads make ~220bhp naturally aspirated)

Would it be safe to say that fitting the VVT heads to the turbocharged engine would give more power potential with the engine 'fully built'? Or is there more to it, and a set of heads that flow well N/A can't keep up with higher flow rates?

Thanks

Have just performed replacement of cambelt and water pump on '97 Legnum (206000kms), it's a 2.5L SOHC V6 (6A13).

After reassembly it runs like absolute crap, won't even idle without foot on the gas, sounds like it's misfiring and a bit of metallic noise..

This is the first time I've done a cambelt and I did make a pretty major mistake during the process: when putting the new belt on, I was trying to realign the timing mark on the rear bank camshaft sprocket, which had slipped anticlockwise around 1 tooth, but it wouldn't turn back to its correct position by hand. So naturally I put a socket on the sprocket bolt and applied light pressure clockwise...

Of course, when it moved, it turned a full quarter revolution clockwise. I knew already I'd screwed up, but I turned it back to where it should be (with some difficulty) and it then sprung another 90 degrees anticlockwise from the timing mark.

Got it under control finally and installed the new belt with all marks aligned, I didn't turn the engine over to verify timing before reassembly though.

What is the probability of valvetrain damage from this mistake? The number 1 cylinder was at TDC when it happened, which I believe is the right-most front bank cylinder.

I ran a compression test and found the rear bank cylinders from left to right were 180psi, 165 psi and 180psi. I tested the centre front bank cylinder for reference and got 165psi. Factory compression spec for the engine is 170psi, what is going on? Surely I can not be getting better compression from an engine with over 200000 kms on it than what they come out of the factory with. Possibly faulty compression gauge? (It's brand new)

Anyway so the compression results if they are accurate would appear to rule out valve damage, so what do you think is the issue? Engine gone out of time?

I was crashed into last week, doing really only cosmetic damage to my vehicle. He made a claim to his insurance company so no problem there. Obviously his insurance company wants to pay for the repairs to my vehicle (around $1400), but I am wondering if there is an easy way to get them to pay cash direct to myself for the cost of repairs.

Any suggestions welcome, thanks!

I'm purchasing a headunit to hopefully connect to two amps, and just wondering, if the specs say two RCA preouts, that's two sets of L+R, not one, right?