Originally Posted by JohnyR17
...Can I expect similar torque numbers with the Edelbrock heads instead of Vortecs? Are the springs on the performer RPM heads too stiff for breaking in a Comp 270H flat tappet cam?
The edelbrock performer RPM heads will provide huge amounts of torque on
a well prepared 400 CI engine, they will outperform the Vortec heads if
both are unported.
In addition the edelbrock heads make a good race head for mild applications
when ported correctly. I have ported many sets with very good results.
Times at the drag strip in the low 11 to mid ten second range with a flat
top 355 and a solid flat tappet cam w/3200 LBS car.
The springs are set up with 120 LBS on the seat for 320 lbs at 0.500" *.
Check with the camshaft manufacturer, I personally have never had a problem
losing a cam lobe with these springs.
* RPM Instructions