Quote:
Originally Posted by taalltheway
….i have to admit to run the XR274 in my SD455…first with the stock heads, now with E-heads…no pinging and it runs incredibly strong in the low and midrange…i will eventually change it for a 230/236/112 HR cam but i can not really say something bad about this cam…i plan to reuse it on my stock 73 455 T/A…maybe add some 6x-heads…i bought this "small" cam to work with the low compression of the SD…i am also thinking about putting the stock head back on so i am very interested in the results you get from this build...
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CLIFF, Read this ,and respond to my note here: According to Davd Vizard's 128 rule, my cam ought to be a 104 LSA, and due to being 9.0:1 it should REALLY be a 103 LSA. My present cam in Signature ran 12.2 ET but sucks gas and won't cold idle with the 1050, with no Q-JET ability. No ability to ping, so bragging on 89 Octane, but no MPG ability. Soooooooooo, seems Vizard could cause me to install an old UD 104 LC cam (LSA happens to be 104) to effect a positive result.
With Duration beng chosen based on max RPM.