305 with 350 heads
11-04-2004, 03:32 PM
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Car: 84 Z28HO
Engine: 350 summit block
Transmission: T5
Axle/Gears: 3.73 10bolt
305 with 350 heads
I have heard that 350 heads will not fit onto a 305 without getting the cylinder bores punched out, on account of valve interference with the cylinder walls. Is this true?
11-04-2004, 03:36 PM
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Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
Considering as how plenty of factory 350 castings are 1.94/1.5" valves, they (valve sizing) will fit.
Whether or not it's smart to put 350 heads on a 305 is a whole new matter.
Whether or not it's smart to put 350 heads on a 305 is a whole new matter.
11-04-2004, 03:40 PM
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Car: 84 Z28HO
Engine: 350 summit block
Transmission: T5
Axle/Gears: 3.73 10bolt
I have a pair of heads from a 327 that have 2.02' Intakes. I suppose they wouldn't fit.
11-04-2004, 04:28 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
In most cases, there isn't a problem.
But, you should limit valve lift anyway. The biggest issues are valve shrouding by the cylinder wall, and chambers too large for proper compression ratio.
But, you should limit valve lift anyway. The biggest issues are valve shrouding by the cylinder wall, and chambers too large for proper compression ratio.
11-23-2004, 12:29 AM
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Car: 1997 Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73 IRS
Bump so as not to start my own thread.
I'm going to be putting 350 heads on my 305. I'm assuming I should get head gaskets for a 350? Is there going to be a detonation problem at all withe the 1/8" ((4-3.75) / 2) mistmatch all around the circumference of the cyls?
I'm going to be putting 350 heads on my 305. I'm assuming I should get head gaskets for a 350? Is there going to be a detonation problem at all withe the 1/8" ((4-3.75) / 2) mistmatch all around the circumference of the cyls?
11-23-2004, 01:35 PM
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Originally posted by DuronClocker
Bump so as not to start my own thread.
I'm going to be putting 350 heads on my 305. I'm assuming I should get head gaskets for a 350? Is there going to be a detonation problem at all withe the 1/8" ((4-3.75) / 2) mistmatch all around the circumference of the cyls?
Bump so as not to start my own thread.
I'm going to be putting 350 heads on my 305. I'm assuming I should get head gaskets for a 350? Is there going to be a detonation problem at all withe the 1/8" ((4-3.75) / 2) mistmatch all around the circumference of the cyls?
Most of the gaskets are the same. For some odd reason a few of them are listed 327/350 only. Havent figured that one out yet, I guess I better go look for water in the oil of all the 305's Ive used 350 gaskets on.
I guess If you were to use 64ishcc heads and flat tops the compression wouldent be too low on a 305, sure would idle smooth with 7:1 compression.
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11-23-2004, 01:45 PM
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Car: 2013 Challenger RT
Engine: 5.7
Transmission: 6 spd
Axle/Gears: 3:92
Originally posted by ljnowell
Are you kiddin me? With that whopping 7:1 compression ratio you are going to make, there wont be any problems with detonation!
Are you kiddin me? With that whopping 7:1 compression ratio you are going to make, there wont be any problems with detonation!
11-23-2004, 01:47 PM
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Car: 1997 Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73 IRS
305 LB9 heads = 58cc combustion chambers
Aluminum LT1 heads = 54cc combustion chambers
My compression will go up...hopefully to 9.8+
Aluminum LT1 heads = 54cc combustion chambers
My compression will go up...hopefully to 9.8+
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