LesteR723

sorry for all the questions iv been asking... i just know you guys are knowledgable and can help me out...

but anyway

i was lookin for an EFI intake maifold for my 89 5.8 and all the manifolds have a "basic operating RPM Range" from idle-5500, 1500-6500, 2500-7900 etc etc.... now i doubt mine will revv over 6000 but if i get the idle-5500 whats goin on between 5500-6000?

also... the only idle-5500 intake manifold i could find for the 5.8 was the edelbrock performer Truck manifold. Also ifound a BBk which was unrated for the RPM range....... but which do you think would work better for my application?

thanks again guys and sorry for the trouble

AdderMk2

the RPM range is how you can match your parts to work together. If you get an intake thats idle-5500 and a cam thats 3500-7000.... dont plan on making much low end power. however, is you can find a manifold thats 1500-6000, and match your cam to that... you will have a very nice area for the power curve. sure, itll make a little less bottom end toque... but youll spin the tires less off the line. I could have sworn that trick flow made a lower that bolted to their street heat upper. that should be the rpm range your looking for

something like THIS would be good for you. I believe you can get the upper pre=painted black.. if your interested!

luckythirteen13

dont look for an intake that makes powe from idle-5500. no one races at idle so what the hell do you need an intake thats made for idle hp? besides, with a 351 youll have enough torque if you just go with the intake adder posted, its a good one

LesteR723

is there any way i could make her revv to 6500? the motor im getting has a flat tappet design.. im not sure if that would effect revvablility at all

EliteTuners

revvability =o i like that.

AdderMk2

flat tappets will withstand higher RPMs better than rollers

88blackgt

try the edelbrock efi, dont remember the exact specs but it sounds like it may fit your application well

LesteR723

alright well that leaves me with 3 things to be answered then...

how can i make it rev to 6500?

hwo is my engine getting air between idle-1500 if the manifold is working between 1500-6500

what cam ? =)

AdderMk2

heavy valve springs and a properly sized cam

just because the operating range is 1500-6500 doesnt mean that it doesnt work at low rpms... it just means that the intake will not produce power that low... you'll still be flowing air
custom grind from www.camshaftinnovations.com

5.0stanger

You would also benifit from balancing your rotating assembly, hardened push rods, ARP fasteners and like AdderMk said, heavy valve springs.