Contour Enthusiasts Group Archives Forums Modifications Duratec Performance ported and polished heads

Running the stock or SVT 2.5 heads on the 3 liter works out to be ~11.2:1 Reworking the edges of the bowl area to remove the sharp edge as well as smoothing ou any casting flash may take you closer to 11:1. David Z is getting the better of both worlds running the race heads from Reinki (SP?) with 3 liter valves and full race ports on the heads. After talking to Chris R about the heads, IIRC he had said very little bowl work was done other than smoothing and slightly unshrouding the valves after installing steel seats ($$$) due to the lack of material between the valves.

For boosted 3 liters, stick with the stock 3 liter '00 SES style heads for mild boost applications. Larger valves, larger cc bowl, larger ports all work for high end HP. BTW, any measurements difference between the 2.5 and 3 liter blocks have been false. The blocks themselves are the same size, only the front timing cover is thicker on the 3 liters. You use the 2.5 front cover, viola, SC 3 liter...