Nice flow numbers. I am glad you choose not to go any more extreme with the porting. The ports can get thin around the water jacket areas and bust. Been there, done that. While dyno-ing the car!
Well it got to the point to where we'd port and see no increase, port and loose a few CFM, port and get it back, so we figured we weren't going to gain anymore air and would just save ourselves the time spent porting over and over and over. Not to mention the chance of hitting water. We have more hours in these heads than I want to count, so in essence they are very expensive cylinder heads and we would hate to turn one into junk. ou:
Ooh boy! Do I know that feeling. Over 60 hours bench time on the port and bowl work, all the really good parts installed, and flow tested with great results. Put the heads in the $ 5 - 6k range. They lasted seven dyno pulls and 6 trips down the 1320. AND I DID THIS TWICE!!!!:af: :ball: :af:
Very interesting post Mike. Maybe that will hold me through the winter. I have a VERY similar build 350 in my wife's 83 Regal. Head numbers are very close and I have a little more compression and one of your cams. I could go to the 1.65 rockers for help. Also started with a good Quick Fuel 950 cfm carburetor on one of your intakes that I had to spend a bunch of time on but was surpised that the engine seemed to like the carburetor. Tried to get it to the track to start "drivers ed" but the only time we got there it blew the tires off first past (Drag Radials) and dead hooked the second past after letting air down and doing a gaint burnout. But only inches off the line it broke the convertor and we were done. Got it fixed but could never get back because of weather and racing the 67. From the feel and sound I think it will fool people. Jim N. Will keep an eye on what you are doing.
Mike, Why not use your heads for a CNC program then offer CNC 350 cylinder head porting as another service. You can use a FARO arm to scan the ports. Here's a related article: http://www.popularhotrodding.com/tech/1011phr_haas_five_axis_cnc_machine/index.html
The most we could do is sell CNC ported iron heads, and I think most people wouldnt justify the very high cost of CNC porting for a set of stock iron heads. Its not a bad idea I can talk to dad about it, but here lies the major problem: There's too much variation in production factory heads. What may work for one casting number of heads may be completely off for another. We have a set of heads here that were cut into the water jacket when having a valve job done, and they flow 250 cfm with a bowl blend and some work on the short turn radius, thats it! Mine have been gouged out and hand crafted and barely eek over 260 cfm, they were like 200-210 cfm stock. So that goes to show how different the heads can be. If I have time someday I'm gonna look for another set of heads with those casting numbers and work on them :3gears:
so what was the # of the casting on the good heads you had? have half a dozen here and might get luck and send them to you. Doug
Red with the black lettering. ........ Polished timimg cover!!! Back water pump!!! Oh wait. This is YOUR engine.:laugh: :laugh: :laugh:
I'm wondering how much all of this would cost. Just bought this Regal from a lil' old lady.......:laugh: