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Old 07-15-2010, 01:34 PM
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Question 305 horsepower?

How much horsepower is in a 305?
How can i improve it?
How much can i improve on a stock automatic transmission?
How much would it cost?
What would i need to change to better cope with the increased power?

Thanks for your help
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1986 Camaro Z28- Automatic, 305, White in color, Hardtop.

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Old 07-15-2010, 02:53 PM
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1 )If you have a Z28 with a carb it is a lg4 305 and it has 165 big horses when new & less now.
2) How to improve it...rip it out and install a 350.
3)700R4 will be all right until you do something dumb & stupid.
4) Cost..as much as you want to spend.
5) You have to make HP before you need to cope with it.
My opinion is you are not making any now. Also if it is a LB9 TPI same as the above except you have 190hp.
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Old 07-15-2010, 03:15 PM
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so change engines and the tranny can take it ok
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1986 Camaro Z28- Automatic, 305, White in color, Hardtop.

1974 Pontiac lemans, Automatic, 400, burgundy, hardtop
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Old 07-15-2010, 05:35 PM
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That would depend on what you changed your engine too. Assuming you swap it to a 300 HP engine then you will need a rebuild/upgrade. Your tranny can be made to handle a lot of HP. The 86 700R4s where problmatic in there stock form.
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Old 07-15-2010, 06:26 PM
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Here's a link to a whole series CHP did on a 3rd gen. including 305 engine and tranny build-up.
http://www.chevyhiperformance.com/sc...les/index.html
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Old 07-15-2010, 09:56 PM
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well im probly gonna slap a carb, intake and some heads on it
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1974 Pontiac lemans, Automatic, 400, burgundy, hardtop
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Old 07-24-2010, 04:53 AM
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my third gen has ALOT of cash in it and the guy i got it from said last time it dyno'd it was around 330 hp and 370 ft tq and its a tbi 305 all the mods are in my sig
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Edelbrock Performer TBI intake
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700R4 Transmission
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B&M Shifter
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Old 07-24-2010, 07:06 AM
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So you belived the sellers BS???
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Old 07-24-2010, 09:18 AM
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Even the 305 TPI motor was only listed as 205HP. I put a few cranks in these 305s under warranty, meaning that 205 HP was too much for them when they where fresh. Think twice about increasing the HP in one of these without going thru the bottom end and upgrading the rod and main bolts. I would also upgrade the rods but if money is tight you can have them sized and peened. I have no idea what the motor will handle with these upgrades and a stock crank but I have a pretty good idea what it won't handle without them
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  #10  
Old 07-24-2010, 07:37 PM
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heowed ethe reciepts where he orderd the parts andwhen he had it rebuilt an the parts the bottom end is all forged from summit
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1991 Camaro RS
Edelbrock Performer TBI intake
Edelbrock Performer Heads
Edelbrock Shorty Hedders
Edelbrock TBI
700R4 Transmission
Custome Cam
MSD Ignition Box
Stinger Hood
B&M Shifter
THIRD GENS, SCARING MUSTANGS FOR 28 YEARS AND COUNTING
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Old 07-24-2010, 07:37 PM
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