Learning from experience
I am wondering about this as well. If a intake valve is shrouded by the cylinder wall, I can't see that it would have any effect at low throttle or low rpm. I could understand possibly a slightly less than optimal top end. We have to keep in mind that only a small portion of the valve is actually shrouded if it is too close to the cylinder wall, the rest of the valve is flowing wide open. I don't see a increase in bore size of .030 having any great flow improvement, as stated the cylinder would only be moved out .015 in relation to the valve.
Dads 6.0 with ls3. makes just over 400 at the tire. drives it every day. Makes power to 6200
You need to find a new cam guy. Alot of people think they know but most don't. You really talked with 3 people about a cam it is no wonder it is a mess.
If the bore was a issue gm would not have built a engine like this from the factory.
Tim
You need to find a new cam guy. Alot of people think they know but most don't. You really talked with 3 people about a cam it is no wonder it is a mess.
If the bore was a issue gm would not have built a engine like this from the factory.
Tim
Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 71
Likes: 0
From: South Mississippi
No i did not just talk to three people, but are you telling me that the people who build the heads can not recommend a cam that will work with them, thats a little far fetched dont ya think. And 400 horse to the tires is nothing to be proud of with this app, i made 468 but there is still room for improvement somewhere
The first cam may not be optimal but I like it better than the second. The second one would work good if you were spraying. I still have a feeling that something else within your combo, possibly something with the tune is holding it back. This kinda goes right along with your last post.
Hang on lemme find this link lol
Heres a good read for you for starters: https://ls1tech.com/forums/dynamomet...p-446rwtq.html
His isnt making more power, but he wanted power under the curve for road racing.
Ill add some more links as I dig them up
Heres a 370 490rwhp, found the link in a thread via search:
https://ls1tech.com/forums/parts-cla...5hp-517tq.html
Heres a good read for you for starters: https://ls1tech.com/forums/dynamomet...p-446rwtq.html
His isnt making more power, but he wanted power under the curve for road racing.
Ill add some more links as I dig them up
Heres a 370 490rwhp, found the link in a thread via search:
https://ls1tech.com/forums/parts-cla...5hp-517tq.html
Last edited by Tainted; Jan 6, 2013 at 08:54 PM.
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Verdad Gallardo Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 71
Likes: 0
From: South Mississippi
You know what i posted to try and help people, but apparently there is people on here that think they know everything and will not listen to anything someone else has to say, so yall have a nice day and good luck with your builds.
You got caught up in the hype despite ALL available information saying they clear a 4.00 bore but really need a 4.065. You tried a 4.030 and then manned up and admitted your mistake and tried to help others but there are going to be those who will never believe, because we all know a huge port and a huge valve always make more power even when the valve is blocked by the bore.
I believe most folks will understand you were stating you bought the wrong heads not that the heads were anything less than quality pieces.
I believe most folks will understand you were stating you bought the wrong heads not that the heads were anything less than quality pieces.
Dead stock other than cam and intake. 62 year old dad drives it everyday. Stick drives like a stocker. no dead spots. idle at 650. Not my point about making big power but drivability and good power for cam only on a 4.00 bore with ls3 heads
No I have a cam and valve train guy. I would not call AFR or TFS or Edelbrock for a cam recomendation.
Like I said alot of self claimed cam gods have no clue.
No I have a cam and valve train guy. I would not call AFR or TFS or Edelbrock for a cam recomendation.
Like I said alot of self claimed cam gods have no clue.
I understand you're trying to help people, but ls3 heads come stock on 4 inch bore engines from the factory. And telling people that building engines with a 4 inch bore and ls3 heads is a mistake, is total nonsense.
Yes, to take full advantage of the ls3 heads, you need a larger bore, but your poor results are not the direct result of the head. I can safely say this because there are hundreds of combinations similar to yours making better power and not flat lining from 5600.
You can't argue with results and call bullshit on every setup that runs better than yours.
Yes, to take full advantage of the ls3 heads, you need a larger bore, but your poor results are not the direct result of the head. I can safely say this because there are hundreds of combinations similar to yours making better power and not flat lining from 5600.
You can't argue with results and call bullshit on every setup that runs better than yours.
Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 71
Likes: 0
From: South Mississippi
Would someone with this setup making better than 500 horse and carrying and making additional horsepower above the 5600-5800 rpm, please speak up because i would like to know what you are doing different than i did. I made plenty of horsepower, 468 at 5600 through a 9 inch, which without a 9 inch would put me close to 490-500. All i am stating is that a camshaft that is suppose to peak at 7200 should not do so at 5600. And oh yeah, i had same results with both shafts. I had also went to 3 different tuners, 2 in LA, and one in Pensacola FL, with the latter of the two doing the SD tune, and making it run to the best of its capability. I could be wrong about the heads, please show me, lay the bullshit down and show me one working max potential.
Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 71
Likes: 0
From: South Mississippi
Thats what i thought to man but i went over everything several times, it was all good. My tuner did a vette 3 weeks before mine with a real similiar setup and same exact heads, and he had the same peak issues. I tore my engine down this last time to correct my problem, checked valve springs, open and closing seat presssures, changed the lifters, checked all the lifter preloads several times, all was perfect, valves are not floating, for some reason heads just dont like the higher rpm's.
https://ls1tech.com/forums/showthrea...2#post16984292
Less cubes, less compression and less supporting mods. Making a little over less than 10 HP than your setup. And the cam is designed to peak around 6k. Which it does. And this was done on a true 4 inch bore.
Less cubes, less compression and less supporting mods. Making a little over less than 10 HP than your setup. And the cam is designed to peak around 6k. Which it does. And this was done on a true 4 inch bore.