If the deck surface of your next set of cylinder heads has been milled 0.010-inch or more, it’s a good idea to check to make sure the heads will sit flush on the block dowel pins. For the SBC, the stock dowel pin is rather tall and can bottom out inside the head – which will not allow the head to sit flush on the block which will cause major sealing problems. The fix is to either drill the dowel pin holes deeper to accommodate the pin or to file the pin to reduce its length. If the pin is even a mere 0.010-inch too long, this will cause all kinds of sealing issues that would be difficult to diagnose.
Too long of a dowel pin will cause the cylinder head to not make contact with the head gasket, or have enough clamping load onto the gasket. This can cause water leaks, oil leaks, or worse yet, leakage of combustion out of the cylinder.
We measured the pin height on one of our small-blocks with a height of 0.280-inch and then measured the depth on the aftermarket heads we were using with a depth of 0.470-inch, which gives us an excess of clearance – but it’s still a good thing to check.
This idea can be applied to any engine, not just the small-block Chevy. LS engines and big-block Chevys use an open center style locating dowel that could also cause problems if not verified.
Parts List
All parts in this list can be sourced from Summit Racing.
- SB Chevrolet Dowel Pin Kit………………………..PIO-S-1110
- SB Chevrolet Dowel Pin Kit/Cam Plug Kit…..SUM-150122
- LS Dowel Pin Kit……………………………………….AAF-AAL-87024
- BBC Pioneer Head Dowel Kit……………………..PIO-839005
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