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Old 10-21-2009, 09:12 AM
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305 To 327???

Hey Guys I got a 305 in my pops early "80's" Camaro. It needs to be rebuilt. A buddy of mine has a set of 327 .030 over pistons. Is it possible to have the 305 bored out to hold these pistons. I have been told that a 305 can be punched out to 343 cubic inches.What do you guys think?

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Old 10-21-2009, 09:18 AM
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junk the 305 and get a 350 short block.

no can't bore a 305 out that far.

and get a 350 roller block.
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Old 10-21-2009, 01:41 PM
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As mentioned 305`s won`t bore that much. However, how they reach 343 cubes is by stroking them with a 400 crank.
If you have 327 pistons you could easily build a 327. a 350 block and a crank from a 307. use 5.7 rods, your 327 pistons and you have it.
I also agree, the cheap route to performance is to find a 350 with a factory roller cam.
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Old 10-21-2009, 01:53 PM
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Best you can do is to take the 305 crank and connecting rods out of the block. Find a 350 bare block and drop it in. Get 350 pistons and 350 heads. Replace the 305 harmornic balancer get a 350 balancer, and you got a 350 engine. Same bore as the 327 just a longer stroke.

Last edited by lg1969; 10-21-2009 at 02:02 PM.
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Old 10-23-2009, 10:44 AM
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ARe you say??

Quote:
Originally Posted by DoubleVision
As mentioned 305`s won`t bore that much. However, how they reach 343 cubes is by stroking them with a 400 crank.
If you have 327 pistons you could easily build a 327. a 350 block and a crank from a 307. use 5.7 rods, your 327 pistons and you have it.
I also agree, the cheap route to performance is to find a 350 with a factory roller cam.
So are you saying that a chevy 400 crank will fit in a 305?? A guy who had one for sale once told me that it would not fit in a 305. but u saying that it will???
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Old 10-23-2009, 11:04 AM
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Why go through that route? First it's going to cost you to have crank journal cut in order to fit it in a 305 block when you can get a 350 block have it bored 30 over and make it a 383. That still costing you a lot of $$$$. 305 crank journal are same as a 350. All you need is 350 piston just drop it in a 350 bare block. Have the whole rotating assy. balanced. It will save you a lot of $$$$.
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Old 10-23-2009, 12:09 PM
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Quote:
Originally Posted by Buddy impala
So are you saying that a chevy 400 crank will fit in a 305?? A guy who had one for sale once told me that it would not fit in a 305. but u saying that it will???
The main bearing saddles in a 305 block are machined for a crankshaft having a main bearing journal diameter of 2.450" (same as all small blocks with the exception of the 400 crank, which is 2.650") If you chuck up a 400 crank in a lathe and cut the main journal diameter down from 2.650" to 2.450", then it will drop right into a 305 block on 305 main bearings.
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