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Old 06-15-2010, 04:35 AM
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305 Turbo-Fire 240hp
 
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Want more compression

Whats a simple and cheap way to raise my 305's compression. Stock 305 in an 86 silverado, headers ,carb, dual exhaust. Block casting is 14010203

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Old 06-15-2010, 05:25 AM
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Ayuh,... Thinner headgaskets...
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Old 06-15-2010, 05:34 AM
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shave the heads or buy pistons
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Old 06-15-2010, 07:59 AM
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use this site to figure out if it is worth the money to make more compression.

http://www.bgsoflex.com/crchange.html

using the site: a 275 hp engine with 8.0:1 cr will make 285hp with 9.0:1 cr. (+4%).

the best way to increase compression in a 305 engine is to install a 350 block under the 305 heads. (A 15% increase in displacement).
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Old 06-15-2010, 08:30 AM
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compression? well, maybe

Would a more appropriate question be, "How can I increase the torque and/or horsepower?" Compression is just one factor of combinations of components that are put together for performance.
As I'm sure you realize and have seen from the coupla responses you've already gotten, you need, of course, to get into the engine to one degree or another. Could I suggest you investigate the HP/torque question and just let compression be one of the possible factors for change. Recommendations for increased HP might likely result in increased compression, but addressing the question as you have is kind of a back-door roundabout way to explore performance increases.
I am assuming, of course, that increased performance is the ultimate goal??? . . .not just compression for compression's sake.
good luck.
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