Thread: Tips on Porting & Polishing!
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04-14-2005 06:48 PM #9
Brian, thats good news to me. After I had my 882 heads rebuilt with a three-angle valve job, new guides and Z28 springs I noticed the exhaust ports were VERY rough and I paid more to have an experienced circle-track guy clean up and smooth only the exhaust ports but by that time I had spent almost as much as if I had purchased aftermarket heads and I was not very happy about only "half porting" the heads. I do know that even with extensive porting the 882 heads do not flow as well as aftermarket heads, but I was not too happy about spending an additional $200 for just smoothing the exhaust ports. Anyway your comments about leaving the intake ports rough to maintain turbulent flow in the inlet is welcome news to me. Note test No. 56 of Ryan's site:
http://www.ryanscarpage.50megs.com/combos8.html
with a mild street cam, my Crane cam has only slightly more duration and lift than the stock Chevy L69 cam so improved exhaust flow should help improve torque as shown in the Test No. 56 with 1.6 ratio rockers on the exhaust and 1.5 on the intakes. Still I have heard about "bowl porting" which I did not get, but now I can look for good low rpm torque to drive that OD 4th gear in my 700R4. The Florida room project is nearing an end soon (???) and I can get back to the roadster, but now I can hope that my "half-ported" heads are maybe an improvement over stock 882 heads, thanks. But is FMX messing with Ford heads? If so, I guess Ryan's data on SBC does not directly apply, but maybe the general principle of smoothing the exhaust and leaving the intake rough still applies as Brian has said?
DonShillady
Retired Scientist/teen rodder





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Yep. It’s pretty sad.
Dead!