${top_text_ad} Single plane is best for higher RPM but less torque and dual plane for torque. Rally the difference from cast to aluminum is weight, also ease of porting if you want. Magnesium are good too, but 1 backfire and they are usually toast. On Fri, Mar 27, 2009 at 6:48 AM, Gary H. <spigot2039@xxxxxxxxxxx> wrote: > > Check out "Mopar Intake Manifold Shootout" here: > http://www.hotrod.com/techarticles/hrdp_0801_mopar_intake_manifolds/edelbrock_performer_rpm_manifold.html > >>Who makes the performer RPM ? How is it for torque and what is the best rpm >>range? Is it single plane or dual plane? I have a 413 engine. Thanks for >>any input................MO...sw iowa -- Steve '63 Hemi Polara ${bottom_text_ad} ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html. This email was sent to: ${recipient} u/?bUrDWg.${encoded_sub_id}.${EMC}