I tell people if your going to build a 400 or 406 bump up to the 421 for a street build its the way to go. Spent the morning on the dyno with Frank Carey. This is the 421 I built, Pump gas HYD roller he wanted a torque monster and that's what he got, I used the AFR 195 heads, Best Torque number 568 @4200 RPM Best HP number was 524 at 5500 RPM. This engine made the best HP & torque numbers with only 30 degrees of total timing. At 3400 RPM there was a dyno sheet that showed 550 Torque. Also a big shout out to Johnson Lifters the valve train was quiet as always, No need for the Snake oil and only needed a 1/4 turn down from zero lash. No need to break in lifters LOL.
Dart SHP block all machined in house
Mahle Flat top piston
3.875 stroke 4340 crank
Scat I Beam 6.0 - 7/16 bolts ARP 2000 series
195 AFR heads 75 cc chambers
Air Gap intake
GM Dist
Scott plug wires
Cam 238/242 on 108 lobe sep, .573 lift Step nose cam
750 Quick fuel carb
Timing set Cloyes Hex-A-Just
Lifters Johnson 2110-R
Champ 8 quart oil pan
Oil Pump 10552
Scorpion 1.5 rockers
Dart SHP block all machined in house
Mahle Flat top piston
3.875 stroke 4340 crank
Scat I Beam 6.0 - 7/16 bolts ARP 2000 series
195 AFR heads 75 cc chambers
Air Gap intake
GM Dist
Scott plug wires
Cam 238/242 on 108 lobe sep, .573 lift Step nose cam
750 Quick fuel carb
Timing set Cloyes Hex-A-Just
Lifters Johnson 2110-R
Champ 8 quart oil pan
Oil Pump 10552
Scorpion 1.5 rockers