best cylinder head

elitesrock2 said

So my 340 seems to run out of steam right around 6700 rpm. Cam card states op range of 4500-7500 and my specs are 340 with 11.7-1 custom ross pistons forged, 302,309 duration .654/.655 lift solid roller comp cams cam, X heads with 2.02 valves, harland sharp 1.5 ratio rockers, super victor intake with a 750 berry grant carb on top. Any suggestions on the best heads i could run on this? seems to be what wipuld be holding it back the most

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You could run huge carb on that...because the dinky ports, in comparison to the cid, pull the bahgeezuzz out it signal wise...
Do you have blackend intake plenum/runners under the carb?
I assume you must be so far into intake reversion, I bet you could change the cam to something flat tappet and smaller LIFT and turn in it in the 7k+rpms.
Either work the heads, not gonna get your money out of them parts surrounding'em though OR RPM'S, better yet buy some speed master or victor heads, depending upon what you are doing if it's rule based or tire limited.