305 build up.
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RE: 305 build up. - 9/16/2008 5:31:02 PM
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Camaro 69
Posts: 1472
Joined: 10/17/2007
Status: online
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The real hold-back on the 305 is the heads. They are a swirled intake design that were designed for low RPM torque and better gas mileage. You plan on adding a lot of other items to help the engine breathe, but the heads will still be suffocating it. Because of the runner design, those heads fall flat pretty much past 3500 RPM. No porting/polishing you can do is going to change the casting restrictions. If you plan on spending time and money on anything, plus since street/strip is your goal, then a good set of aftermarket heads, or 305 H.O. heads will help wake it up.
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Eats Rice and Poops Out Fords
393 Stroker, Tunnel Ram/Dual Quads, and a well used rear-view mirror
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RE: 305 build up. - 9/16/2008 5:46:45 PM
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slick84z28
Posts: 12
Joined: 8/19/2008
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the best advice i can give you is to call the COMP CAMS help line.they will tell you the best set up for you.you can get a good amount of power and torque out of a 305. the trick is to have the good set up. you diffently don''t want to OVER cam the motor. it is easy to do. a mild cam for a 350 will be a little more aggressive for a 305. look at your heads.find out the specs on them.some 305 heads have enough room to drill-out the intake valves.that will help you to get the heads to breath.doing this will help you get more power.you could have a great cam for the car, sounds great but if it doesn''t breath good ,it not going to run up to its full potential !! when you call the cam help line, ask them about a complete kit. CAM,LIFTERS, SPRINGS,RETAINERS AND LOCKS. you will have to change your stock springs to better springs so you will not coil-bind. if you don''t change your springs you could wipe out the new cam.
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RE: 305 build up. - 9/16/2008 6:10:44 PM
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slick84z28
Posts: 12
Joined: 8/19/2008
Status: offline
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i am building a 305 now for my k5 blazer. the bottom end is stock [not borred], a comp xtreme 4x4 cam 432/453 lift, 305 HO head, [shaved,ported,poished,
intake valves drilled out to 194 exh 150 manley valves] performer intake and 650 holley carb. motor will have about 300 hp and about 310 to 320 ft/ibs tq.
the HO heads have a very small chamber for them.about a 58cc and about a 185 runner before they were ported.
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