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Old 09-28-2002, 09:29 AM
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Post 350 heads on a 305

Have a question if i put a pair of 350 heads on my .60 over 305, i know that i have to change the rods to the 350's but will that be too much rod lenght.

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Old 09-28-2002, 09:35 AM
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Changing the heads has no effect on rod length. The reason for changing heads is to get a better flowing head, larger valves, or change compression ratio,( up or down). What are you hoping to accomplish by changing?
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Old 09-28-2002, 09:40 AM
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I read that 350 head increase hp's on a 305 block. is this not true?
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Old 09-28-2002, 10:15 AM
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More than likely your 305 is only 8.5:1 w/ 58cc heads.Putting 350 heads will lower your comp. ratio.350 heads are 76cc and some old ones were 64cc as were the Vortecs.With 64cc you'd be at like 8:1 and with 76cc you'd be at like 7.5:1 Might want to look into the aluminum corvette heads 58cc w/ 1.94/1.50 or the S/R Torquer 305 heads.The corvette heads I believe were of then L-98,not exactly sure about the fit I think there the 86-up style.
What you probably reads was putting 305heads on a 350.This will make a higher compression small valve motor thats torquy as hell till around 5,000rpm.
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Old 09-28-2002, 02:57 PM
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One thing to remember when you are dealing with a very small bore diameter like the 305 is bore shrouding, and valve interference. Clay up your engine if you run larger valves on a 305. As far as 305s go, they run very well with the 305 "601" cylinder head, it has 58 CC chambers, and 1.84 inch intakes, with 1.50 exhaust valves. On this small engine, stick to the smaller heads, and it will be snappier down low, if you want more punch upstairs, go with the 305 SR Torquers from World Castings.
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