Reply to "Piston/Cam selection"

Tai Krige (Guest)

Ital 351 Hi- proberly too late to toss this into the pot, but anyhow,- Your choice of 'goodies' sounds great except for one item IMHOP. 4V, Open chamber heads. True they will drop your c.r., but their design is compromised compared to the 4V closed- chamber'quench'hds. which, believe it or not, support a much higher( as much as a full point?) possibility,- compression-wise, due to the cooling of the mixture from the flamefront, as it travels across the combustion chamber,the shape'Quenching' and hence cooling it down. Plus it works. Dont touch the ports, they are spot on, just un-shroud the inlet ......... (picture in Ford's Performance Book 'bible') Match these hds. with a flattop piston -+ 11.00 or dished for less. I have run for many years a flat top piston with these hds. and have had no problem with pinking, detonation on pump gas.
regards, tai.

10/21/0311:06 AM

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