305 to 357 swap
08-08-2011, 08:06 PM
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Car: 1992 RS Camaro
Engine: 350
Transmission: 700r4
305 to 357 swap
thinkin bout swapin my 305 tbi to a 79 350 bore 40 over (357) with a mild cam how much of a difference u think will i tell in HP
08-08-2011, 08:19 PM
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Car: 1992 RS Camaro
Engine: 350
Transmission: 700r4
305 to 357 swap
thinkin bout swapin my 305 tbi to a 79 350 bore 40 over (357) with a mild cam how much of a difference u think will i tell in HP
08-08-2011, 11:04 PM
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Car: 1988 Camaro
Engine: 377
Transmission: TH350; Circle D 4200 converter
Axle/Gears: Ford 9"
Re: 305 to 357 swap
You really haven't given us any information so our guess is as good as yours is. a 357 is bigger than a 305, so you will make more power... but HOW MUCH comes down to what parts are in it.
08-08-2011, 11:07 PM
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Car: 1992 RS Camaro
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Transmission: 700r4
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08-09-2011, 06:45 AM
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Re: 305 to 357 swap
Depends on the 350 you put in.
The year the block was cast and the extra .040" of bore are totally irrelevant. What pistons are in it, what machine work was done (in particular, were the decks cut down to match the piston height), what heads are on it, things like that will matter ALOT more.
The year the block was cast and the extra .040" of bore are totally irrelevant. What pistons are in it, what machine work was done (in particular, were the decks cut down to match the piston height), what heads are on it, things like that will matter ALOT more.
08-09-2011, 07:01 AM
#9
08-09-2011, 07:05 AM
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Car: 1990 IROC
Engine: Rebuilt L98 with H/C/I/Carb
Transmission: TH350 with ATI Treemaster
Axle/Gears: 7.5 with 4.10's
Re: 305 to 357 swap
Will you be topping it with the TBI, stock manifolds, stock exhaust and all emissions equipment? If you don't, you probably wont get it inspected. If you do, you probably wont make more than 225HP.
08-09-2011, 01:52 PM
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Merged the threads.
Stock '79 350 heads are so horrible, most likely you won't make any more power with the 350 than you have now with the 305. If you doubt that, consider that both were rated at about the same horsepower.
If you don't change every piece of the TBI exhaust, you will choke the 350, anyway.
The '79 350 shortblock is capable of decent power with good heads, cam to match, exhaust to match, etc.
Stock '79 350 heads are so horrible, most likely you won't make any more power with the 350 than you have now with the 305. If you doubt that, consider that both were rated at about the same horsepower.
If you don't change every piece of the TBI exhaust, you will choke the 350, anyway.
The '79 350 shortblock is capable of decent power with good heads, cam to match, exhaust to match, etc.
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