305 Rebuild - Help Needed
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Joined: Jul 2020
Posts: 22
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From: Michigan
Car: 1991 Firebird Formula
Engine: 305 v8
Transmission: 700r4 Auto
Axle/Gears: 2.73
305 Rebuild - Help Needed
My roommate and I are either wanting to rebuild our current 305 or replace with a 350 Vortec, but aren't sure which to go for.
In his 91' Firebird he has a very tired 305. We are looking for a budget option, so what we were thinking on doing is:
- Fresh rebuild .030 over 305
- Vortec 5.7 heads, milled
- LT1 cam with 1.5 roller rockers
- Ported TBI unit
- Headers and y-pipe from Hedman
- ECM tuning
With all of these changes we are hoping to get around 300 HP, give or take (I believe it would be a bit less than 300). But we have been told that doing all of what I listed above and making a 'fun 305 around 300 HP' would throw a rod. Is this true? If so, do you have any suggestions on what can be done to avoid that?
We were also considering a 350 Vortec and just drop it in, but even then we'd still want headers and such which would put that at well over $4,000.
Any help, suggestions or opinions would be appreciated. We are trying to essentially find the cheapest route to getting around 300 HP and avoiding killing the car; and yes we want to keep TBI.
In his 91' Firebird he has a very tired 305. We are looking for a budget option, so what we were thinking on doing is:
- Fresh rebuild .030 over 305
- Vortec 5.7 heads, milled
- LT1 cam with 1.5 roller rockers
- Ported TBI unit
- Headers and y-pipe from Hedman
- ECM tuning
With all of these changes we are hoping to get around 300 HP, give or take (I believe it would be a bit less than 300). But we have been told that doing all of what I listed above and making a 'fun 305 around 300 HP' would throw a rod. Is this true? If so, do you have any suggestions on what can be done to avoid that?
We were also considering a 350 Vortec and just drop it in, but even then we'd still want headers and such which would put that at well over $4,000.
Any help, suggestions or opinions would be appreciated. We are trying to essentially find the cheapest route to getting around 300 HP and avoiding killing the car; and yes we want to keep TBI.
Joined: Jan 2005
Posts: 10,449
Likes: 508
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 305 Rebuild - Help Needed
My roommate and I are either wanting to rebuild our current 305 or replace with a 350 Vortec, but aren't sure which to go for.
In his 91' Firebird he has a very tired 305. We are looking for a budget option, so what we were thinking on doing is:
- Fresh rebuild .030 over 305
- Vortec 5.7 heads, milled
- LT1 cam with 1.5 roller rockers
- Ported TBI unit
- Headers and y-pipe from Hedman
- ECM tuning
With all of these changes we are hoping to get around 300 HP, give or take (I believe it would be a bit less than 300). But we have been told that doing all of what I listed above and making a 'fun 305 around 300 HP' would throw a rod. Is this true? If so, do you have any suggestions on what can be done to avoid that?
We were also considering a 350 Vortec and just drop it in, but even then we'd still want headers and such which would put that at well over $4,000.
Any help, suggestions or opinions would be appreciated. We are trying to essentially find the cheapest route to getting around 300 HP and avoiding killing the car; and yes we want to keep TBI.
In his 91' Firebird he has a very tired 305. We are looking for a budget option, so what we were thinking on doing is:
- Fresh rebuild .030 over 305
- Vortec 5.7 heads, milled
- LT1 cam with 1.5 roller rockers
- Ported TBI unit
- Headers and y-pipe from Hedman
- ECM tuning
With all of these changes we are hoping to get around 300 HP, give or take (I believe it would be a bit less than 300). But we have been told that doing all of what I listed above and making a 'fun 305 around 300 HP' would throw a rod. Is this true? If so, do you have any suggestions on what can be done to avoid that?
We were also considering a 350 Vortec and just drop it in, but even then we'd still want headers and such which would put that at well over $4,000.
Any help, suggestions or opinions would be appreciated. We are trying to essentially find the cheapest route to getting around 300 HP and avoiding killing the car; and yes we want to keep TBI.
Ditch the 350 Vortec head idea and get a set of 059 or 520 casting 305 Vortec heads. The chamber is smaller and they flow extremely well too. You will be over 300 hp with that setup. I made 300 hp with 059s and the stock cam.
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