250hp 305 Can it be done?
11-18-2003, 12:37 AM
#1
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Location: Dodge City, KS
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250hp 305 Can it be done?
As you all know I just got my Camaro yesterday, and i'm already setting a goal. To build a 250hp Naturally Aspirated 305. So my question is am I on the right track.
Replace TBI with a Performance TBI (From Edelbrock)
Cam Swap....From a 88-92 Z28 or IROC
Victor Jr. Performance Intake
And anything else I may need. I'm new at this so i'd like to do it the right way the first time. So please give me your advice and imput and if i'm on the wrong track let me know. Thanks y'all I really appreciate it.
Replace TBI with a Performance TBI (From Edelbrock)
Cam Swap....From a 88-92 Z28 or IROC
Victor Jr. Performance Intake
And anything else I may need. I'm new at this so i'd like to do it the right way the first time. So please give me your advice and imput and if i'm on the wrong track let me know. Thanks y'all I really appreciate it.
11-18-2003, 02:28 AM
#2
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I myself would just scrap the 305TBI.
It can be done, But why?
For instance run it while you build a 350 or 383.
But since this is probably a daily driver. I will tell you what I would do.
Buy a better cam and lifter set than what came stock in the 88+ 3rd gen's. Someone will chime in with a good one.
Try the for sale section and/or ebay good deal's can be had.
I would also buy some header's, Used is fine.
But down the road, I will warn you. You will kick yourself in the *** for wasting money on a 305.
I know you have heard this before. But a junk yard block is only 100 bucks, then machine work is about 125-200, then rod's, cam, crank, piston's, head's and intake. and you're pretty much set after a carb.
And you will have almost double the HP & TQ with the 383.
Plus N20 if you are brave.
Just my $0.02
Frank
It can be done, But why?
For instance run it while you build a 350 or 383.
But since this is probably a daily driver. I will tell you what I would do.
Buy a better cam and lifter set than what came stock in the 88+ 3rd gen's. Someone will chime in with a good one.
Try the for sale section and/or ebay good deal's can be had.
I would also buy some header's, Used is fine.
But down the road, I will warn you. You will kick yourself in the *** for wasting money on a 305.
I know you have heard this before. But a junk yard block is only 100 bucks, then machine work is about 125-200, then rod's, cam, crank, piston's, head's and intake. and you're pretty much set after a carb.
And you will have almost double the HP & TQ with the 383.
Plus N20 if you are brave.
Just my $0.02
Frank
Last edited by quickslick86; 11-18-2003 at 02:31 AM.
11-18-2003, 09:24 AM
#3
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I've already reached 250 at the crank (213 RWHP). Edelbrock Performer carb intake, Holley TBI adapter, LT1 cam, World Torquer 305 heads and loades of custom prom work.
I don't beleve you'll make 250 HP with stock swirl-port heads.
250 HP is also pushing the limit of what the stock injectors and throttle body can support. My car starts to lean out at 5000 rpm and the MAP numbers start to drop at about 4500 rpm under full throttle.
I don't beleve you'll make 250 HP with stock swirl-port heads.
250 HP is also pushing the limit of what the stock injectors and throttle body can support. My car starts to lean out at 5000 rpm and the MAP numbers start to drop at about 4500 rpm under full throttle.
11-18-2003, 11:18 AM
#5
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Location: Madison, WI
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I agree with the previous statement: Don't bother spending so much cash on the 305. If you're dying to spend money, buy parts that are bolt on and simple and will swap over to whatever you're going to build next. Get headers, get your exhaust... stuff that'll transfer. Then work on building your engine, be happy with the sound and performance of the wussass 305 (Still a sturdy, torquey engine) until you can finish building up a better motor. 
11-18-2003, 06:49 PM
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tpi 305 make 280 at the flywheel stock........"why??" u ask? cause 5.0's rule..they last for ever and are very underestimated and most of all, are most definatly capable of good power.......am i sayin 350's or 383's suck? f*ck no, they rule... just dont go and say 5.0's r worthless, ive seen modded five oh's spank 350 ***
11-18-2003, 07:50 PM
#10
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Originally posted by chevyman502bb
tpi 305 make 280 at the flywheel stock........"why??" u ask? cause 5.0's rule..they last for ever and are very underestimated and most of all, are most definatly capable of good power.......am i sayin 350's or 383's suck? f*ck no, they rule... just dont go and say 5.0's r worthless, ive seen modded five oh's spank 350 ***
tpi 305 make 280 at the flywheel stock........"why??" u ask? cause 5.0's rule..they last for ever and are very underestimated and most of all, are most definatly capable of good power.......am i sayin 350's or 383's suck? f*ck no, they rule... just dont go and say 5.0's r worthless, ive seen modded five oh's spank 350 ***
I've also seen a good running LB9 give an L98 a run for its money. Good motors, no doubt.
-Rippin
11-18-2003, 08:54 PM
#12
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Location: Madison, WI
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Yeah wasn't dissing your engine choices, just wanted to bring out facts so everyone had 'em handy.
I've had three 305-powered "sports cars" in my life, and none of them have ever given me problems. They're durable as hell, even if their output isn't insane.
I've watched my buddies go through 350's like fat men through a box of oreos... Don't know. Maybe they are more reliable, or maybe its just coincidence. I've certainly had a helluva pile of luck with them if its coincidence.
I've had three 305-powered "sports cars" in my life, and none of them have ever given me problems. They're durable as hell, even if their output isn't insane.
I've watched my buddies go through 350's like fat men through a box of oreos... Don't know. Maybe they are more reliable, or maybe its just coincidence. I've certainly had a helluva pile of luck with them if its coincidence.
11-18-2003, 10:16 PM
#13
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Basicially I just want to get good power out of what i have right now. Which is why i'm willing to put money in the 305. But it's good to know that I can easily make 250hp. And i'll probably stop there just for the sake of my wallet. But later on a 383 or an LS1 mite be in the works. Who knows the possibilities are endless. But thanks for your opinions I really appreciate the imput.
11-18-2003, 11:57 PM
#14
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Location: Stanley Va
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treat a 5.0 right (change oil ect.) and it WILL last u forever.....my couzins trans am tpi 305....180k with its whole life literaly WOT, my dad truck with 305 tbi 293k...thats right i said 293k.....in a 96 sierra.....and has at least 50k left baby.....junk? not in the least
again, dont think that im saying a 305 is THE engine, no no no.....the 305 is a great engine, very reliable and capable of good streetable power
again, dont think that im saying a 305 is THE engine, no no no.....the 305 is a great engine, very reliable and capable of good streetable power
11-19-2003, 07:40 AM
#15
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Ya, 250 in a 305, or most any V8, so long as it is not a damned for 4.6, is fairly easy!
On my Z-28 for example; all I plan on doing is Full exhaust (Headers, cat-back, and all) Bigger carb, Intake manifold, and hopefuly a cam, and I am near 300 horse already.
Parts off of camaroz28.com and E-Bay, I expect to spend less than 1500-dollars for EVERYTHING.
On my Z-28 for example; all I plan on doing is Full exhaust (Headers, cat-back, and all) Bigger carb, Intake manifold, and hopefuly a cam, and I am near 300 horse already.
Parts off of camaroz28.com and E-Bay, I expect to spend less than 1500-dollars for EVERYTHING.