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i currently have my gt with an e303 cam. i was wondering what is the biggest i could go with ported e7 heads, and rockers, i plan on putting new springs.f303, x303, or z303. and what type of rockers do these heads have 1.7 or 1.6
 

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iam goin with the z303 cam with the .550/.550 lift on my proformer head .The z303 will make ur car sound BAD A$$!!
 

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Im running a TFS stage 1 and 1.6rrockers. I kinda wish I had gone with 1.7 now because a TFS stage 2 cam is too big for my pistons but there is enough room for 1.7 rockers.

Im not a big fan of ford cams because of the real low lobe sep on and that really produces a crappy idle when another cam of more power wouldnt.
 

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I have an e303 with the 1.7's and it works very nicely. The 1.7's give it quite a bit more lift...I'm not sure how much but I have been to it makes that e cam close to an f cam...Anyway...I can still pass a tail pipe emissions test every year. With the x or z cam you more than likely wont because of the duration.
 

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call the comp cams tech line, they will give you better answers than anyone would on the internet since they will ask you more questions than you can think of
 
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