a well thought thru 406 sbc combo for street/strip use

grumpyvette

Administrator
Staff member
Dart Block 9" deck
JE pistons 4.155 bore, 1.125 comp height
Scat 44lb light weight crank 3.750 stroke
Scat H beam rods 6.0
10.3 to 10.5 comp ratio, with the 70cc heads
AFR 210cc heads
8 qt baffeled oil pan
milodon windage screen
http://www.airflowresearch.com/210sbc_rh.php
210cc-RR-Head-Flow-Graph2.gif


crane Roller hyd
http://www.cranecams.com/?show=browseParts&action=partSpec&partNumber=119841&lvl=2&prt=5
1.6 rockers
EDELBROCK RPM AIR GAP intake
750 speed demon carb

port%20size%20chart.jpg


its a street strip combo and you want to run high test Id suggest a cpr in the 10.0-10.3:1 range with that 119841 crane cam,a quench distance of about .040-.044 max, and Id watch the ignition curve A/F ratio and coolant temps, you should be fine as long as its slightly rich on the a/f ratio (12.7-13.7:1) and the coolant temps kept in the 170F-180F range most of the time, be aware that an oil cooler helps, reduce the tendency to get into detonation, as piston and valve temps are also controlled and stabilized to some degree thru high flow rates of oil thats kept preferably in the 215F-220F range maximum and a high capacity baffled oil pan with ideally a windage screen to strip excess oil off the rotating assembly, yes youll need to watch the sparkplug condition and header temps for info on the combustion chamber temps but you should have a nice combo when its done, yes ID run the 1.6:1 roller rocker but your effective lift will be approaching .595 so check all clearances in the engine carefully and make sure the valve spring load rates and clearances and valve train geometry is ok before starting it up, Id sure want a .100 valve to piston clearance minimum, and a valve max lift in the .650-.680 range if possiable
Id suggest 1 3/4" dia. & 38" long primairys and a 19" long 3" dia collector on the headers
don,t look to exceed 6300rpm and you should see a decent torque curve that will make a light car in the 2800lb-3300lb range scoot nicely with a manual trans and a 3.73-3.90 rear gear ratio, or a auto with a 3000 rpm stall converter
keep in mind the idea is NOT PEAK hp but a responsive combo with instant killer tq, that pulls hard over a wide rpm band!

IS THERE ANYONE HERE THAT CAM POST A DD 2000 results on the combo??

Please keep us posted on the projects progress and your results,IF YOU BUILD THIS, pictures are always appreciated, and (HINT)verify those spring load rates, install heights,dia,clearances etc and clearance issues with BOTH crane and AIR FLOW RESEARCH when ordering parts,pushrod lengths and valve train geometry will naturally need to be checked and verified durring assembly.

http://www.racingsprings.com/beehivesprings.htm

http://www.racingsprings.com/PDF/beehive.pdf

http://www.ferrea.com/

http://www.ferrea.com/general-results.php?company_id=100631&category_id=6038

beehive springs allow a smaller dia and lighter weight retainer and give greater rocker to retainer clearance, and you might want longer valves to keep the geometry correct with the extra tall valve spring installed height that MIGHT be necessary

(I usually have guys order from these suppliers)or at least get the parts special ordered from summitracing or jegs if I build the heads up custom)

ID order from these guys(but have a long talk with CRANE and AIR FLOW RESEARCH tech guys)

http://www.dougherbert.com/

http://www.summitracing.com/

http://www.jegs.com/?sendroicid=1B2...d=jegs+EXACT&gclid=CNLmhvus4ZUCFQ60Hgody3ZkWw

http://www.ohiocrank.com/

http://www.lewisracingengines.com/

http://www.cranecams.com/
 
Back
Top