Buy ported heads new or have AI port....
01-11-2012, 02:47 PM
#42
And more importantly (most of the time) increased low-mid range torque. That's where I think 5.3L heads are underrated. Most people look at peak hp numbers when in reality you don't see them nearly as you do the mid-range.
Now if you are building an engine and can control the CR that you want then 5.3L's are not the best choice since there are better flowing heads out there.
Now if you are building an engine and can control the CR that you want then 5.3L's are not the best choice since there are better flowing heads out there.
01-11-2012, 05:52 PM
#43
The thing some people don't realize about a 5.3 head is by the time it has been worked to most company's 2/2.5 stage head the chamber has been opened up to 63cc+ yielding around 10.8/1 compression on a stock longblock. Yes that is a bump just not as much as some people think.... Stock 243's are 64xx as a benchmark.....
EDIT: 63cc+ is no milling...
EDIT: 63cc+ is no milling...
01-11-2012, 06:32 PM
#44
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A "standard" AI port job will give you around 11:1 on a 241 or 853 head, which will allow a cam around .600 lift, 226-230 duration, 112LSA with no p-to-v issues. Talk to Phil or Ron down there and you'll be impressed, I guarantee it.
+100000 on buying head work and cam (and pushrods) from the same source
C
+100000 on buying head work and cam (and pushrods) from the same source
C
02-14-2012, 08:58 AM
#47
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What did you end up doing on this build? I see in your sig that you have a 228R listed now; is it in the car? How do you like it? What did you do with heads? Any dyno numbers?
I got my heads and cam from AI last week and got my motor back together Saturday. The machine work on the heads was sweeeeeeeet and the cam looked perfect. I will get the cooling system and fuel system put back together over the next couple of weeks and hopefully fire the b!tch up by the end of the month!
C
I got my heads and cam from AI last week and got my motor back together Saturday. The machine work on the heads was sweeeeeeeet and the cam looked perfect. I will get the cooling system and fuel system put back together over the next couple of weeks and hopefully fire the b!tch up by the end of the month!
C
02-14-2012, 11:08 AM
#49
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Old 01-05-2012, 08:20 PM #9
smokeshow72
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^243s? What size cam?
If this question was for me, the heads from that car are 853s but they basically get the 241 port job, so they're essentially 241s when they come back.
The cam is .600/.600 @ 226/230 with a 110LSA (112 would've been "standard" but they're going to do me up a 110 because of the sound I want).
C
smokeshow72
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^243s? What size cam?
If this question was for me, the heads from that car are 853s but they basically get the 241 port job, so they're essentially 241s when they come back.
The cam is .600/.600 @ 226/230 with a 110LSA (112 would've been "standard" but they're going to do me up a 110 because of the sound I want).
C
02-15-2012, 11:26 AM
#52
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Doh I forgot I asked you that same question awhile ago in this thread
Smokeshow, what was the total cost for heads and cam from AI if you don't mind me asking.
C
Here are some pics of AI's work on my project:
I know it is kinda lame to link to your own thread, but...
https://ls1tech.com/forums/chevrolet...28-i-hope.html
02-22-2012, 06:27 AM
#54
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The original list was just the heads; $1245 for the machine work, the springs, the seals, and assembly. The cam (a custom grind, spec'd by AI) was $395 if purchased with head work, $475 if purchased alone. I think the cam is cheaper if you tell them exactly what cam lobes, lift, duration, etcetera, that you want.
C
C
