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Old 09-01-2009, 03:03 PM   #1
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L03 Heads
I'm replacing seals and seats, etc because mine need to be reserviced, just curious what should i do thats cheap to get a little more out of the heads while i have them apart?
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Old 09-01-2009, 04:05 PM   #2
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Re: L03 Heads
what do you mean by "seats" any machine work is a waste find another set or a different casting

throw them in the trash...?
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Old 09-01-2009, 09:10 PM   #3
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Re: L03 Heads
no i'm blowing blue smoke so i'm reservicing my own heads right now.
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Old 09-02-2009, 10:53 AM   #4
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Re: L03 Heads
Seats are not a DIY job. And they have nothing to do with blue smoke. If you want to do seals, that's great. No need to pull the heads, but if you do, then upgrade to the non-swirl-port heads used on the LB9s with 5-speed.
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Old 09-02-2009, 08:43 PM   #5
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Re: L03 Heads
swap heads your saying?
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Old 09-02-2009, 09:37 PM   #6
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Re: L03 Heads
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swap heads your saying?
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Originally Posted by SpitotRs305 View Post
throw them in the trash...?
Seriously, these are the worst heads GM ever made. Just about anything is better than these heads. A set of 350 vortec heads would be great, even the 305 vortec heads are far superior to LO3 heads.
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Old 09-03-2009, 10:47 PM   #7
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Re: L03 Heads
What should i do though? I don't know the appropriate casting of 305 heads, and people tell me i'll lose compression or it'll be hell working with 350 vortec heads on my 305.. ive been hearing good and bad reports on them and no ones giving me a straight answer. :\ I know that'll i'll need with vortec heads a vortec aluminum intake to tbi, and since i do that i heard a cam would help alot... (lt1 w/ vortec?)
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Old 09-04-2009, 05:42 PM   #8
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Re: L03 Heads
yes if you run the 906 or 062 vortec castings you will loose a bit of compression gonna guess .2-.5 but the power you will gain from just not running those other heads will more than make up for it but you are starting to get into the area of needing a new tune
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Old 09-04-2009, 06:42 PM   #9
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Re: L03 Heads
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What should i do though? I don't know the appropriate casting of 305 heads, and people tell me i'll lose compression or it'll be hell working with 350 vortec heads on my 305.. ive been hearing good and bad reports on them and no ones giving me a straight answer. :\ I know that'll i'll need with vortec heads a vortec aluminum intake to tbi, and since i do that i heard a cam would help alot... (lt1 w/ vortec?)
059 casting are good 305 vortec heads.

I would not invest in new heads if stayn under 5000rpm.
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Old 09-04-2009, 09:33 PM   #10
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Re: L03 Heads
well from what you all said those are 3 castings, and IF i remember correctly, each casting just has a slight different type of air flow chamber?

which one would be best if i get a different cam later? and maybe get a bigger throttle body?
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Reload this Page L03 Heads
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