In the process of building my first Buick 455, so go easy on me. 4.342 bore, 3.912 stroke, 28 CC dish, 10.69 compression, 149 casting heads, 2.005/1.630 valves, flow numbers. Intake @ 28 inches SF 600 4.350 bore. .200 133 .300 187 .400 208 Exhaust .200 89 .300 120 .400 141 .450 149 The cam is a hyd flattappet, .398/.466 lift, unknown duration. Intake is a 403 casting factory Buick with a 1971 Buick Q-Jet. I plan on using TA shaft 1.55 ratio rockers. I have the short block finished and its a little rough. Working on the heads. Some pictures. Engine will be dyno tested and track tested in the near future.
Mark, If this build is anything like your Chevy builds, it will be impressive !!! Is this going into your Stocker ? Keep us posted.....
How bad are your Chevy customers ragging you about building a Buford ? But yea your oval port stuff is Stout no doubt
Thanks, it is for the stocker......everyone seems to like the project, now if I can just get the heads done.
Mark, I hope I'm not out of place or wrong in my suggestion. Get those Heads flowing. I quickly compared your numbers to other iron heads and saw there may be some minor improvement yet for flow. http://www.v8buick.com/showthread.php?304440-Iron-455-Heads-How-Much-Flow-Comparsion Here are my '71 1237661 iron head flow numbers. .200 148 .300 190 .400 228 exhaust .200 114 .300 145 .400 170 Troy
Man,those valve guide bosses are huge. I dont remember my 430 castings having so much meat around them. Are you going to use a CNC program to port them or by hand?
This is the dyno test of the engine as it came out of the car before the freshen up. The car ran 11.35 @ 115.98 @ 5000 DA 28.00 baro, the car was right at 3500 pounds. Interestingly the heads supported 474 HP with 208 to 211.7 CFM @ .400 lift. So it makes sense the heads would be the first thing to look at as Troy stated. I also noticed the power is fairly wide through the range the car is run in.
I proceeded with the valve job, and of course after setting my valve depths there was one problem child, a seat that would not come in at the proper height after replacing all the guides, good thing I had seats made to fix this potential problem. I installed a intake seat, problem fixed. Valve job is done, CCs will be set at 59.5.
Preliminary dyno testing data is in, 522 HP @ 560s TQ. I want to thank Chris Skaling for his help with this project.
The cam is a hyd flat tappet with .398 intake lift, 466 exhaust lift, 253 @ .050 on the intake, 264 @ .050 on the exhaust 108 lobe separation. Heads are 1971 149 castings with 2.005/1.630 valves.