i know there are alot of guys that say they have put e7's on with stock cam and no problems. and i have heard of guys that have put e7's on and have had pv clearance problems. if the gt40 are designed like the e7's(are far as valve placement ane size) you might have problems. just go with the twisted wedges. and then put a 347 under that. then top it off with an s-trim.
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