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Old 11-08-2012, 12:59 PM
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Is it because to much compression. Is there any thing I can do to help it perform better. I have a jegs cam shaft. Lift: .420"/.442 Adv. Duration: 262/272 RPM Range: 1500-4000 sittin in the basement. Would that help it.

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  #17 (permalink)  
Old 11-08-2012, 01:41 PM
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THat 420/442 cam is one of the best designs to replace the stock cam. It gives you more power and torque while sacrificing nothing. I have used it many times. It makes a nice driver.
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Old 11-08-2012, 07:18 PM
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What if I ported those heads and put the cam in the 305. Do you all think that it would be ok for a daily driver. Also I have flat top pistons. Do I need to worry about a valve hitting the piston
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Old 11-09-2012, 01:31 PM
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the 083 heads will work well on a 305 with flat top pistons.
Even better if you shave them down .040" to get the chamber volume down.
Install on your 305 using a felpro 1094 gasket.

These are the 350 L98 TPI motor cast version of the 305 TPI head (081)

they'll work.
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Old 11-09-2012, 06:16 PM
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The 305 and like engines are non interference fit. It would take gross amounts of lift and a catastrophic rotational event for the piston to touch the valve.
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Old 11-09-2012, 07:02 PM
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Ok thanks for the input. Just curious. Im not doing this cause I dont want to waist these heads on a 305 but how would the 305 react to vortec heads (906) and that cam I listed above. Both heads are 64 cc but of course the 906's flow alot better. Would it be worth doing that. I have two pairs of vortecs but also have two 350 blocks I am putting them on and experimenting with the two. Curious how they would do on a 305 with that cam. Nothing else.
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Old 11-17-2012, 02:26 PM
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Yes i have them. There yours if you want to pick them up. If you can figure out how to sent iron heads pm me with ideas.

Had to find the thread again. Not cracked and stored inside.
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Old 11-18-2012, 09:45 AM
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any head larger than 58cc will be useless on a 305. just stick with a good set of tpi 305 heads and you will be fine.
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