Thoughts and help on engine upgrades.

[Behold81]

I too the ls6 as I can sort some compression with Pistons. I don't need the big drop yet till the larger charger I think.

As to the YTs I'm not sure what to check for to confirm batch number. Any links?

And thanks. I'm looking forward to the build.

[MyM8V8]

Google is your friend. Senior moment again, its not batch numbers but how they are stamped that may give a clue.

http://ls1tech.com/forums/generation-iii-internal-...

PS. I have a set of 1.7's that have been awesomely fine.

[stevieturbo]

I've an old 224/230 on 115 I used a few years ago sitting doing nothing, or LPE GT2-3

Also have my old 1.7 YT ultralights I've been using past few years.

I'm switching to a solid roller ( hopefully not a bad idea ) at the minute

[Behold81]

MyM8V8 said:

Google is your friend. Senior moment again, its not batch numbers but how they are stamped that may give a clue.

http://ls1tech.com/forums/generation-iii-internal-...

PS. I have a set of 1.7's that have been awesomely fine.

Thanks. That still does not help. The ones I have are not ultralites. They look like Jon adjustable platinums. They have more meat where they are week and there solid.

[MyM8V8]

stevieturbo said:

I've an old 224/230 on 115 I used a few years ago sitting doing nothing, or

Not a bad choice for the man. Won't have any vices at that.

[MyM8V8]

Behold81 said:

MyM8V8 said:

Google is your friend. Senior moment again, its not batch numbers but how they are stamped that may give a clue.

http://ls1tech.com/forums/generation-iii-internal-...

PS. I have a set of 1.7's that have been awesomely fine.

Thanks. That still does not help. The ones I have are not ultralites. They look like Jon adjustable platinums. They have more meat where they are week and there solid.

They should be OK then. I'm sure it was only some of the Ultralites that had issues.

[Behold81]

MyM8V8 said:

Not a bad choice for the man. Won't have any vices at that.

Looking in to it it seems. Want long duration with only a little overlap. What's the lift on it stevie?? What sort of condition is it?

[Behold81]

MyM8V8 said:

Not a bad choice for the man. Won't have any vices at that.

Looking in to it it seems. Want long duration with only a little overlap. What's the lift on it stevie?? What sort of condition is it?

[Boosted LS1]

MyM8V8 said:

He could also just put some thicker head gaskets in to lower CR. He already shelled out for the LS6's.

True but thicker gaskets are a bodge imo and won't lower c/r very much. There will be no squish effect. Swopping heads will retain squish and quench. Squish helps prevent detonation. He could do 'back to back' if he wanted and sell the spare heads. 317's must be cheap nowadays?

[Behold81]

The lower CR can be done with pustons later on. I'm not pushing the limit on the car just yet. It's more the fact I am increasing the compression. With 317s I lower it. And I think it's a bit to low I really wanted to just even it back to 10.1

I'm sure for now it's fine.

[stevieturbo]

Behold81 said:

Looking in to it it seems. Want long duration with only a little overlap. What's the lift on it stevie?? What sort of condition is it?

It's on good condition, lift just 581/591

I used it with my 383 many years ago, it idled nicely, revved nicely, just did everything good. Changed it for something bigger at the time and TBH with hindsight it was probably a backwards step

[MadMaxHSV]

Behold81 said:

Thanks. That still does not help. The ones I have are not ultralites. They look like Jon adjustable platinums. They have more meat where they are week and there solid.

Those should be fine. As Gareth mentions it was the Ultralites that have been known to suffer failure. I present exhibit A:



These were the earlier batch (note the 1.7 stamp offset). Since replaced with a full replacement set, touchwood no problems.

[stevieturbo]

I've ran my UL's for years with no problems.

But if you already have the older ones, even if they went out of favour at the time...really dont see much point in changing.

[Behold81]

Lift looks fine. I belive the ls6 tops out flow at about .580 and the port will be done by me so not sure I'll do much more good to need over .600

As to the duration. It seems mild from what I'm reading but open to your comments. Get the idle will be good with very little overlap. But would a little more not be beneficial for performance.

This is a toy car now. I'm not needing to be to reserved.

I'm still learning on cams so please slap me and teach me!!!

[SturdyHSV]

Behold81 said:

Lift looks fine. I belive the ls6 tops out flow at about .580 and the port will be done by me so not sure I'll do much more good to need over .600

One thing to consider, it only spends a very small amount of time at maximum lift, so even if it doesn't flow enough to take advantage of that .600, the valve will be open further for longer as it heads up to .600 if you see what I mean (depends on ramp rates etc. but you get my drift)

I'm not in a position to give advice in this thread really, just thought I'd chuck in my .02 (probably worth about .01 )

[ARAF]

SturdyHSV said:

Behold81 said:

Lift looks fine. I belive the ls6 tops out flow at about .580 and the port will be done by me so not sure I'll do much more good to need over .600

One thing to consider, it only spends a very small amount of time at maximum lift, so even if it doesn't flow enough to take advantage of that .600, the valve will be open further for longer as it heads up to .600 if you see what I mean (depends on ramp rates etc. but you get my drift)

I'm not in a position to give advice in this thread really, just thought I'd chuck in my .02 (probably worth about .01 )

You need to plot lift over time, to get a graphic representation of the ability to flow. I'm sure Behold81 knows that though, as he's always been very hands on with his car.

[jameshsv]

A nice 230/238 will do the job for me.

[MyM8V8]

MadMaxHSV said:

Behold81 said:

Thanks. That still does not help. The ones I have are not ultralites. They look like Jon adjustable platinums. They have more meat where they are week and there solid.

Those should be fine. As Gareth mentions it was the Ultralites that have been known to suffer failure. I present exhibit A:



These were the earlier batch (note the 1.7 stamp offset). Since replaced with a full replacement set, touchwood no problems.

Bad luck Piers. Didn't realise you had them. ere they fitted at the time of the rebuild?

[stevieturbo]

Behold81 said:

Lift looks fine. I belive the ls6 tops out flow at about .580 and the port will be done by me so not sure I'll do much more good to need over .600

As to the duration. It seems mild from what I'm reading but open to your comments. Get the idle will be good with very little overlap. But would a little more not be beneficial for performance.

This is a toy car now. I'm not needing to be to reserved.

I'm still learning on cams so please slap me and teach me!!!

The biggest mistake most make, especially with boost is choosing a cam thats too big.

I was trapping 148/149mph with that cam in a 383ci 8 years ago.

Even the new cam for the solid roller setup, is actually very very close to the same specs, within 2deg or so, and the SR with only a fraction more lift.

[MadMaxHSV]

MyM8V8 said:

Bad luck Piers. Didn't realise you had them. ere they fitted at the time of the rebuild?

Yep went on during the build. This failure was a few years back.