Quote:
Originally Posted by Toshab
The knock only appears when I start it up and when the motor is at high RPM's. Other than that, it's almost not even there.
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Does it knock under acceleration???
If it doesn't make noise (what ever it is) under a load, it's not a good sign.
A good friend of mine had a 307 w/ a knock like yours, drove it for quite a while, like that. One day the knock got louder in a hurry, it made a BIG knock when the connecting rod punched a hole in the side of the block...
The 520 heads are what I used on my 283 when I had it rebuilt (they were the stock heads, also) I thought of using larger valve heads (which also have larger ports). That would have been a mistake, the 520 heads are perfect for a 283, on the streeet.
I had a 67 Bel Air w/ a 283 in it, could barely keep it from clattering (original condition). When I tore it down, it had lead desposits in the chambers and on pistons. I had the engine built by a REAL engine builder, I did a lot of work on the heads, one of the things I did was smooth all the sharp edges in the chambers and piston tops. I've put 160,000 miles on it since, never had it ping, ever.