Fired up my new 225 aluminum slant this week. Got a nice Dutra dual exhaust system installed. 500 edelbrock carb. Offy aluminum intake. Idles good but upon acceleration I`m getting a knocking noise from the engine and it sounds like its close to the #1 or #2 cylinder. 35 psi oil pressure. I know this is brief but I have all new parts inside and out. I wonder if the lifters would knock like this if they are out of adjustment? It does not knock when idleing maybe its the timing? Who knows????

not by chance the new aftermarket fuel pump? I guess you'd hear that at idle as well as under throttle. =(

I was just looking for a "don't worry" solution

sorry, i couldn't help myself. two thing i would do, adjust valves and check timing/vacuum advance.

Need more info on the "knock" sound. Can you compare it to something in tone and volume?

Spark advance and valves -- no. Those don't really make "knocking" sounds at idle.

Just asking about something I have no idea about...
Didn´t some aluminum /6´s have some trouble with the cam "walking"???
Could it be something like that?

Just an idea...

The cam setup's the same in the aluminum and iron blocks; no real systematic walking issues.

One question for Lancergt: Which way round did you install the conrods? Oil hole pointing towards...?

Connecting rod oil holes are pointed away from the cam. (Pointing toward the drivers side). Almost sounds like a rod knocking if that helps anyone. Does not sound like a valve to me. It is coming from down in the belly of the beast.

I had a tork come lose one time on me,and it sounded
like a rod knocking. It also was there when I hit the gas
but not there at idle..

What is a tork?

A resident of Torkey, also known as Torquey.

Good, that's how they're meant to be in the aluminum engine. It does sound as though you're looking at some fairly large reworking, I'm afraid...

Could a bad harmonic balancer produce a knock? Seems odd that the knock only happens with an increase in speed. Just a thought.

No, there's really no way the harmonic balancer can go bad that could cause a knock. But you may want to recheck your flywheel (or flex plate) attachment to make sure it's correct.

That depends... I had a 440 that developed a horrific knock within a few minutes of first-start one time. I was ready to tear into her again but it turned out to be simple: I'd used an aftermarket fluid-type damper, and the bolts were *just* long enough to rub against the timing chain cover.

The knock happenening with an increase in speed could mean many things, though. It could be a connecting rod that only gets loud when the centrifugal forces get high with increasing speed.

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Basil, Cybil, Polly, or Manuel?

Does that make it a Fawlty Tork?

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