It will be very difficult to port those heads without removing the guides unless you want to make them flush with the port. A machine shop should be able to press them out for you for little money...only thing I don't know is if they can be re-used once pressed out.
My first go around with the DOOEs that I ported were done with the old guides and the new guides were then put in and were trimmed down to be flush with the port. When I wiped a few bearings and had to rebuild last year, I found several guides that had .005 or .006 clearance...they had really worn in only 3500 miles. The shop that re-did my heads said the guides were too short so now I have about 3/16" of the guide protruding out into the port with beveled ends. Some would say I need even more guide length than that. One consolation is that my 26986 beehives have less spring pressure than the old 972s so the force on the guides will be a tad less. Of course rocker geometry plays a big role in all this too.
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Tracy Blackford: Corona, Ca
'65 FB Mustang 331, 282S cam, ported 351W heads. T5z, 3.50 posi.
new rebuild...single plane, more head work, 360 RWHP goal.
<font size=-1>[ This Message was edited by: blkfrd on 6/9/07 4:27am ]</font>
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