So ya want a 400 for your company 2whl drive pickup that the employees will drive daily and you don't want it to be a hot rod. Huh..........
So we keep the stock 2bbl Holley and cast iron 2bbl intake. Let's deck the block to square it up, bore it .030" over and hone the cylinders with a deck plate. Use cast aluminum replacement pistons and balance the rotating assembly. 346 heads with 2.14/1.81 valves, hardened exhaust seats and enough porting to get, 250 cfm @ .500" lift. Use a Summit 6400 camshaft and 'takeoff' 440 Source valves springs set up at 120# IH and 240# @ .450" lift. Comp 10 degree retainers and locks. Stock rocker assembly and TrickFlow 3/8 pushrods to get the correct lifter preload. Recurve the stock distributor, use the dyno headers and spin the 400 up on the dyno.
RPM.................TQ/HP
2500...............351/167
2600...............350/173
2700...............355/183
2800...............367/195
2900...............371/205 peak torque
3000...............368/210
3100...............369/218
3200...............366/223
3300...............367/231
3400...............361/234
3500...............359/239
3600...............360/247
3700...............354/249
3800...............351/254
3900...............343/255
4000...............337/256
4100...............329/257
4200...............325/260
4300...............326/267
4400...............323/270
4500...............322/276
4600...............307/269
4700...............318/285 peak horsepower
4800...............308/281
4900...............302/281
5000...............297/283
What if there was enough spare time to install a 383 Holley Street Dominator intake and a 950 Quick Fuel carburetor? What if just that change? Let's start the at 2800 RPM and pull the little 400 to 5300 RPM.
2800...............346/184
2900...............347/192
3000...............359/205
3100...............374/221
3200...............376/229
3300...............383/240
3400...............391/253
3500...............396/264
3600...............397/272 peak torque
3700...............395/278
3800...............392/283
3900...............397/295
4000...............397/302
4100...............397/310
4200...............390/312
4300...............388/318
4400...............377/316
4500...............374/321
4600...............375/329
4700...............380/340
4800...............382/349
4900...............380/355
5000...............368/351
5100...............371/361 peak horsepower
5200...............362/358
5300...............345/348
7.515:1 compression? 85 octane? You betcha!
