Chevy 305 engine
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==Cylinder heads== | ==Cylinder heads== | ||
| − | The chamber volume is less than the 5.7L heads, around 55cc to 58cc depending on the casting. Like any head the chamber volume has to be measured to know for sure what the volume is. The biggest 305 intake | + | The chamber volume is less than the 5.7L heads, around 55cc to 58cc depending on the casting. Like any head the chamber volume has to be measured to know for sure what the volume is. The biggest production 305 intake valve is 1.84". The largest practical intake valve size is a 1.94", and the chambers need to be unshrouded for these to flow their best. In cases where there is no problem losing a little compression ratio, the cylinder bores can be slightly notched (like was done with some Pontiac and BBC engines, to name two) to help the intake flow. |
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| + | {{Note1}}Just be sure the relief doesn't reach the top ring with the piston at TDC and that the relief does not go under the fire ring of the head gasket! Use a head gasket as a template on the head and block so the combustion chamber and the cylinder reliefs match and don't intrude on the fire ring of the head gasket. | ||
===Pre Vortec heads=== | ===Pre Vortec heads=== | ||
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