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Discussion Starter · #1 ·
Ok i have a Holly contender on my 383 with a holly 670 street avenger on top. I know the Holly is an older manifold, i dont think Holly even makes it anymore. I was thinking about swapping it out with one of these or a differnt makers manifold for more power. Im not to sure what cam is in it ect...thanks for your help.
 

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if you are using a spreadbore quadra style,the performer air gap is hard to beat. great flow from idle on. this is your street cruiser manifold,can do towing. dual plane low rise

if you hace solid lifters, 3.73gears, and a holley, go with air gap RPM

this is my oppinion
 

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Discussion Starter · #4 ·
Thanks yes im going to get 3.73's and posi before i was gonna switch out the intake. Wish i new more about the motor. Had it built for me about 10 years ago by my father and didnt really know to ask what was used in it. It does have a nice lope in the idle so i know there is a nice size cam in there but other than that i dont know. thanks
 
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