my 350 has 305 heads
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Joined: Jan 2007
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From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
my 350 has 305 heads
from mortec.com 14102187...87-91...305..........1.84"/1.5" valves
hey i have a 350 with these 305 heads an edelbrock 600cfm carb and performer intake
are these heads killing me i, thinking go with vortec but i dont have a roller engine
what would you do. btw i'm keeping the carb and intake.
hey i have a 350 with these 305 heads an edelbrock 600cfm carb and performer intake
are these heads killing me i, thinking go with vortec but i dont have a roller engine
what would you do. btw i'm keeping the carb and intake.
Joined: Sep 2005
Posts: 27,893
Likes: 2,436
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: my 350 has 305 heads
Yes they are killing you.
They are TBI "swirl-port" heads. Anti-performance.
"Vortec" is not connected in any manner, way, shape, or form with "roller engine". If you want to use those heads, there's no reason you can't; subject to making sure that you prep them sufficiently to avoid the retainers hitting the valve guides, if your cam has more than about .460" or so of lift. You cannot, however, retain that intake with those heads, because the intake ports are in the wrong place ("Vortec" being GM's marketing buzzword for "we moved the intake ports"). You'll hear about "drilling the bolt holes"; yeah, you can maybe get it to bolt up that way, but you'll entirely lose the benefit of the heads if the intake runners don't match up, and you may even find that the intake doesn't even cover the ports in the heads. You can keep the carb, if you really want that to keep your car from reaching its full potential.
See this thread for a pic of the mismatch.
They are TBI "swirl-port" heads. Anti-performance.
"Vortec" is not connected in any manner, way, shape, or form with "roller engine". If you want to use those heads, there's no reason you can't; subject to making sure that you prep them sufficiently to avoid the retainers hitting the valve guides, if your cam has more than about .460" or so of lift. You cannot, however, retain that intake with those heads, because the intake ports are in the wrong place ("Vortec" being GM's marketing buzzword for "we moved the intake ports"). You'll hear about "drilling the bolt holes"; yeah, you can maybe get it to bolt up that way, but you'll entirely lose the benefit of the heads if the intake runners don't match up, and you may even find that the intake doesn't even cover the ports in the heads. You can keep the carb, if you really want that to keep your car from reaching its full potential.
See this thread for a pic of the mismatch.
Last edited by sofakingdom; Mar 30, 2007 at 09:30 AM.
Thread Starter
Member
Joined: Jan 2007
Posts: 385
Likes: 0
From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: my 350 has 305 heads
thanks for the feed back the issue with my intake and carb is money see i already have them they were new when i got the car so with that engine and a t5 tranny what heads would you use?
Joined: Sep 2005
Posts: 27,893
Likes: 2,436
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: my 350 has 305 heads
Some other heads.
You asked about Vortec; I told you about Vortec. I accept no responsibility for paying for them. They don't GIVE away those heads, or the intakes that fit them. You wanna play, you gotta pay. Face it.
I would SURE AS HELL get those TBI heads off of there. Almost anything except maybe 70s smoggers like 882 or 624 or 993 castings would be better.
A set of non-TBI 305 heads would probably be the best cheeeep alternative. Look for 081 castings. People part with them for less than Vortecs since they don't have the buzzword thing going on for them, and they don't require a different intake.
You asked about Vortec; I told you about Vortec. I accept no responsibility for paying for them. They don't GIVE away those heads, or the intakes that fit them. You wanna play, you gotta pay. Face it.
I would SURE AS HELL get those TBI heads off of there. Almost anything except maybe 70s smoggers like 882 or 624 or 993 castings would be better.
A set of non-TBI 305 heads would probably be the best cheeeep alternative. Look for 081 castings. People part with them for less than Vortecs since they don't have the buzzword thing going on for them, and they don't require a different intake.
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