4AC stock cam information desired

**oldeskewltoy** · 31-01-2013, 02:55 PM

I might be doing a little porting on a 4AC, and I wanted to know if anyone had the specifications for the stock 4AC camshaft? Any SOHC "A" cam specs will likely do.....

The reason... I may be cutting the head upwards of a mm, and I wanted to know what stock cam timing was so we could check/adjust it during assembly.

**Callifo** · 01-02-2013, 09:27 PM

What are you after specifically?

I have a 4A engine service manual from Toyota that has specific measurements in it but nothing that specifies stock timing. Google says the stock cam has the following specs "Stock OE replacement cam. .213 int and exh cam lift, all durations measured at .050", 204 degree int and exh duration."

**oldeskewltoy** · 02-02-2013, 07:12 AM

Originally Posted by Callifo

What are you after specifically?

I have a 4A engine service manual from Toyota that has specific measurements in it but nothing that specifies stock timing. Google says the stock cam has the following specs "Stock OE replacement cam. .213 int and exh cam lift, all durations measured at .050", 204 degree int and exh duration."

Intake valve closing event....... My goal is to try and re-set cam timing after I cut the head

**Callifo** · 02-02-2013, 12:39 PM

The pages don't seem to have anything in the way of that wording or anything near that wording so I'm not sure what I'm looking for specifically. I could copy it if you like but most of the specs are based on tolerances and rebuild limits etc.

Excuse my lack of understanding but couldn't you do that with marking the current timing before and then using an adjustable cam timing gear afterwards?

**oldeskewltoy** · 03-02-2013, 05:14 AM

Originally Posted by Callifo

The pages don't seem to have anything in the way of that wording or anything near that wording so I'm not sure what I'm looking for specifically. I could copy it if you like but most of the specs are based on tolerances and rebuild limits etc.

Excuse my lack of understanding but couldn't you do that with marking the current timing before and then using an adjustable cam timing gear afterwards?

I'd prefer to have a specification, or a known beginning point.... but to be direct in answering your question.... yes.