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429 sbc ls build

General engine tech -- Drag Racing to Circle Track

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slo-svt
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Re: 429 sbc ls build

Post by slo-svt » Mon Nov 19, 2018 2:42 pm

CGT wrote:
Mon Nov 19, 2018 10:49 am
Have you given any more thought to what your going to do valve event wise? The lobe series that Billy emailed you are interesting, and it seems to be an advantage for sure that they've had so much spintron time on them using a lot of the components you will be using.

I like:
Lobe#23704 Intake
Lobe#23820 or 23818 Exhaust

112-114°ish LSA......Just nut-up and do it already.....you can't be scared your whole life! [-X :roll: :D :D :D :D :D :D :D :D :D
Based on my email Email with Mr. Godbold thats the plan. What stage is that cam exactly? I am thinking PSI DR 427 RML springs with installed height set at 1.875-1.900. I just hope the cam fits in the engine with the milled heads.
"I believe in the scientific method and one should have a healthy skepticism of things in general. From a scientific standpoint, you always look at thing probabilistically and not definitively."

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Rowdy Yates
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Re: 429 sbc ls build

Post by Rowdy Yates » Mon Nov 19, 2018 2:45 pm

Good quote.... Forgiveness is between you/your engine and God. It's my job to arrange the meeting.
One of my better ones.

CGT
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Re: 429 sbc ls build

Post by CGT » Mon Nov 19, 2018 3:03 pm

slo-svt wrote:
Mon Nov 19, 2018 2:42 pm
d on my email Email with Mr. Godbold thats the plan. What stage is that cam exactly? I am thinking PSI DR 427 RML springs with installed height set at 1.875-1.900. I just hope the cam fits in the engine with the milled heads.
Your not doing anything new in engine building. Its been done before, other people have built ls7's before. I wouldn't actually even build a "real" engine. And certainly don't dyno, you can find the results of other people stuff online and use that.
"If you pick up a starving dog and make him prosperous, He will not bite you. This is the principal difference between a dog and a man"

Newold1
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Re: 429 sbc ls build

Post by Newold1 » Mon Nov 19, 2018 4:32 pm

Yes, the only experience I've had with an E38 was a little exposure to a retune of GMHP crate LS3 that had a cam and intake change on a Dyno setup.
Yep, with that overlap you will be lucky to get it to idle at 1200rpms.
You might already know that Marcella makes a billet intake that might fit but at about $3500 might blow up your project budget.
Could you idle this thing only in closed loop at all with about 16 to 1 or so AFR's on a E38 reading O2's?
Have you considered staged dual injectors instead of a single high lbs per hour single set? Not sure an E38 can even do that.
The Older I Get, The Dumber I Get :wink:

slo-svt
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Re: 429 sbc ls build

Post by slo-svt » Mon Nov 19, 2018 5:02 pm

I just ordered the PSI springs (pn DR 427 RML) from Joe Hornick Enterprises. I am going to end up using Comp Lightweight Tool steel retainers. Hornick gets 23 dollars a retainer for the ones they make in house. A whole set of lightweight tool steel from comp that should work is 157.99 from jegs. Part number 1754-16 if anyone else runs into this. Any thoughts on the cam. The lobes CGT mentioned are

Lobe .020 .050 .200 lobe lift Valve lift with 0 lash

23704 293 262 184 0.430 .774

23818 311 278 192 0.385 .693
23820 315 282 196 0.385 .693

I think I'm going to use the 23704 on the intake and 23818 on the exhaust with 114 lsa installed at 110 or 111. Anyone care to weight in on the cam?
"I believe in the scientific method and one should have a healthy skepticism of things in general. From a scientific standpoint, you always look at thing probabilistically and not definitively."

Elon Musk

Newold1
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Re: 429 sbc ls build

Post by Newold1 » Mon Nov 19, 2018 7:44 pm

Know you still building and not into tuning yet but if this aide is helpful you might find some help with idle. If you already know all this forget I mentioned it for you. Just trying to give you some places you might find some help with the E38 tuning issues and educating myself also.

www.masterenginetuner.com/ls-big-cam-idle.html
The Older I Get, The Dumber I Get :wink:

Rowdy Yates
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Re: 429 sbc ls build

Post by Rowdy Yates » Tue Nov 20, 2018 2:05 am

I like to base the Cam on head and Intake flow. Start off with a Rpm range and pick lift based on how well both sides flow. Then compare the intake and exhaust ratio to come up with split. You can't know how much help the exhaust needs till after porting.

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Re: 429 sbc ls build

Post by CGT » Tue Nov 20, 2018 1:42 pm

slo-svt wrote:
Mon Nov 19, 2018 5:02 pm
I just ordered the PSI springs (pn DR 427 RML) from Joe Hornick Enterprises. I am going to end up using Comp Lightweight Tool steel retainers. Hornick gets 23 dollars a retainer for the ones they make in house. A whole set of lightweight tool steel from comp that should work is 157.99 from jegs. Part number 1754-16 if anyone else runs into this. Any thoughts on the cam. The lobes CGT mentioned are

Lobe .020 .050 .200 lobe lift Valve lift with 0 lash

23704 293 262 184 0.430 .774

23818 311 278 192 0.385 .693
23820 315 282 196 0.385 .693

I think I'm going to use the 23704 on the intake and 23818 on the exhaust with 114 lsa installed at 110 or 111. Anyone care to weight in on the cam?


Are you waiting for someone to donate head gaskets ?
Last edited by CGT on Tue Nov 20, 2018 2:03 pm, edited 2 times in total.
"If you pick up a starving dog and make him prosperous, He will not bite you. This is the principal difference between a dog and a man"

slo-svt
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Re: 429 sbc ls build

Post by slo-svt » Tue Nov 20, 2018 1:48 pm

CGT wrote:
Tue Nov 20, 2018 1:42 pm
slo-svt wrote:
Mon Nov 19, 2018 5:02 pm
I just ordered the PSI springs (pn DR 427 RML) from Joe Hornick Enterprises. I am going to end up using Comp Lightweight Tool steel retainers. Hornick gets 23 dollars a retainer for the ones they make in house. A whole set of lightweight tool steel from comp that should work is 157.99 from jegs. Part number 1754-16 if anyone else runs into this. Any thoughts on the cam. The lobes CGT mentioned are

Lobe .020 .050 .200 lobe lift Valve lift with 0 lash

23704 293 262 184 0.430 .774

23818 311 278 192 0.385 .693
23820 315 282 196 0.385 .693

I think I'm going to use the 23704 on the intake and 23818 on the exhaust with 114 lsa installed at 110 or 111. Anyone care to weight in on the cam?
Are you waiting for someone to donate head gaskets and free stuff?
CGT I think you found your way into the wrong thread. Your looking for DV and carnut thread. Here is a link for your convenience.

https://www.speed-talk.com/forum/viewtopic.php?f=1&t=48390
"I believe in the scientific method and one should have a healthy skepticism of things in general. From a scientific standpoint, you always look at thing probabilistically and not definitively."

Elon Musk

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Re: 429 sbc ls build

Post by CGT » Fri Nov 23, 2018 10:02 am

entitlement gasket.jpg
Got you covered. You'll just have to clean them up a little, next I'll try to locate some 15.00 head gaskets for a SBF for another member.
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"If you pick up a starving dog and make him prosperous, He will not bite you. This is the principal difference between a dog and a man"

slo-svt
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Re: 429 sbc ls build

Post by slo-svt » Thu Dec 06, 2018 10:41 pm

I just switched jobs so I have been kind of distracted but I have a pretty big pile of parts lying here so it should be too much longer.
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"I believe in the scientific method and one should have a healthy skepticism of things in general. From a scientific standpoint, you always look at thing probabilistically and not definitively."

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Re: 429 sbc ls build

Post by CGT » Fri Dec 07, 2018 7:19 am

None of those parts will run correctly with your current hood. I hate to be the person to break it to you. You are hood limited and your goals are bound by your hood design. Maybe reconsider using some parts that are more hood compatible.

Also have you desktop dynoed your build yet? You might see what others have specced. You aren't doing anything new or original most likely. Good luck :lol:
"If you pick up a starving dog and make him prosperous, He will not bite you. This is the principal difference between a dog and a man"

steve316
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Re: 429 sbc ls build

Post by steve316 » Fri Dec 07, 2018 9:03 am

Is it the job or the hood that has you distracted?? Inquiring minds want to know. :lol:

Newold1
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Re: 429 sbc ls build

Post by Newold1 » Fri Dec 07, 2018 10:47 am

My thought is I realize you want that Corvette of yours back on the road and charging around and I would assume you have backup transportation to and from work and such?

However, haste can make waste and stabilizing your economic situation and protecting and stabilizing your job and job environment is critical

So my suggestion is to take more time with all aspects of this build and make sure it will go together and become useable and functional without to much money and time being exhausted.

I will share my laws of success with projects like this!

Newold's first law of success! MURPHY WAS A FU*KIN OPTOMIST !!! :lol: :roll:
The Older I Get, The Dumber I Get :wink:

steve316
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Re: 429 sbc ls build

Post by steve316 » Fri Dec 07, 2018 12:44 pm

Murphy's Law some times works in reverse. [-o<

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