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LS3 Carbed build

General engine tech -- Drag Racing to Circle Track

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randy331
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Re: LS3 Carbed build

Post by randy331 » Thu May 02, 2019 3:02 pm

Av. port speed fps at the lifts posted last page by CGT.

.500---258
.600---275
.700---277
.800---289
.900---296

When Dozer recovered from the "all inclusive" part of the weekend, and got outta that chair, he looked and said you need more lift.

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CGT
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Re: LS3 Carbed build

Post by CGT » Thu May 02, 2019 3:56 pm

randy331 wrote:
Thu May 02, 2019 3:02 pm
he looked and said you need more lift
How much more? Your talking abandoning hydraulic lifters with that #-o
"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"

202ci EH
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Re: LS3 Carbed build

Post by 202ci EH » Wed May 08, 2019 12:02 am

Whats everyone using for shim's in stock ls7 lifters? Looked at lathing some old plungers with a parting tool but that's a lot of work, be nice if some were available?

GARY C
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Re: LS3 Carbed build

Post by GARY C » Wed May 08, 2019 12:10 am

CGT wrote:
Thu May 02, 2019 3:56 pm
randy331 wrote:
Thu May 02, 2019 3:02 pm
he looked and said you need more lift
How much more? Your talking abandoning hydraulic lifters with that #-o
Enough to maximize your big FlowZ, could be that the dog is just not impressed with people who use flow benches!
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THE ABOVE POST IN NO WAY REFLECTS THE VIEWS OF SPEED TALK OR IT'S MEMBERS AND SHOULD BE VIEWED AS ENTERTAINMENT ONLY...Thanks, The Management!

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Re: LS3 Carbed build

Post by CGT » Thu May 09, 2019 11:20 am

Resized_20190504_162918.jpeg
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Resized_20190504_181700.jpeg
I had a little burr on the cutter I used for the bottom cut, couldn't locate it, but it served the purpose regardless. We'll see what she does.
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Last edited by CGT on Thu May 09, 2019 11:34 am, 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"

GARY C
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Re: LS3 Carbed build

Post by GARY C » Thu May 09, 2019 11:22 am

Looks good.
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paulzig
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Re: LS3 Carbed build

Post by paulzig » Thu May 09, 2019 4:19 pm

It'll be interesting to see how it responds to filling the intake port floor, the head still looks plenty big and flowzy...

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Re: LS3 Carbed build

Post by CGT » Thu May 09, 2019 4:27 pm

paulzig wrote:
Thu May 09, 2019 4:19 pm
It'll be interesting to see how it responds to filling the intake port floor, the head still looks plenty big and flowzy...
Are you calling me a flowzy? No, your a flowzy! :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"

paulzig
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Re: LS3 Carbed build

Post by paulzig » Thu May 09, 2019 4:55 pm

CGT wrote:
Thu May 09, 2019 4:27 pm
paulzig wrote:
Thu May 09, 2019 4:19 pm
It'll be interesting to see how it responds to filling the intake port floor, the head still looks plenty big and flowzy...
Are you calling me a flowzy? No, your a flowzy! :lol:
No, my apologies if it came across that way you are a lady not a flowzy and I did not mean to besmirch your good name..

cgarb
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Re: LS3 Carbed build

Post by cgarb » Thu May 09, 2019 4:59 pm

paulzig wrote:
Thu May 09, 2019 4:55 pm
CGT wrote:
Thu May 09, 2019 4:27 pm
paulzig wrote:
Thu May 09, 2019 4:19 pm
It'll be interesting to see how it responds to filling the intake port floor, the head still looks plenty big and flowzy...
Are you calling me a flowzy? No, your a flowzy! :lol:
No, my apologies if it came across that way you are a lady not a flowzy and I did not mean to besmirch your good name..
Lol....you are a gentleman, a scholar and an all around athletic supporter.

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Re: LS3 Carbed build

Post by CGT » Fri May 31, 2019 10:19 pm

Resized_20190523_170036.jpeg
Resized_20190524_212747.jpeg
Update
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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"

steve cowan
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Re: LS3 Carbed build

Post by steve cowan » Sat Jun 01, 2019 3:09 am

hi C H A D
coming along real nice by the looks
i have a couple of questions if you dont mind-
machining the head intake face ?? is this to to correct intake manifold alignment or to square up the epoxy floor.?
i know nothing about LS3 stuff so this is probably a stupid question but here goes-
the wing on the intake guide boss looks to me to redirect towards the cylinder side- is this because of port bias in the bowl/roof area or the chamber shape,just curious thats all.have not talked in a while i hope you are doing well.is special needs in the malibu yet. :D
steve c

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Re: LS3 Carbed build

Post by CGT » Sat Jun 01, 2019 1:15 pm

steve cowan wrote:
Sat Jun 01, 2019 3:09 am
hi C H A D
coming along real nice by the looks
i have a couple of questions if you dont mind-
machining the head intake face ?? is this to to correct intake manifold alignment or to square up the epoxy floor.?
i know nothing about LS3 stuff so this is probably a stupid question but here goes-
the wing on the intake guide boss looks to me to redirect towards the cylinder side- is this because of port bias in the bowl/roof area or the chamber shape,just curious thats all.have not talked in a while i hope you are doing well.is special needs in the malibu yet. :D
Hey Steve. All the LS ports hook left into the side of the cylinder like that...it really isnt ideal i dont think..but keep in mind these things werent designed as race heads. There is definite bias built into the port. Passenger car and light truck heads were their original purpose. It's probably one of several reasons they tend to underperform.

Milling of the intake face was done to correct it after angle milling the decks and for manafold fitment.


Special needs is waiting on some header fabrication before going in the car.
"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"

202ci EH
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Re: LS3 Carbed build

Post by 202ci EH » Mon Jun 10, 2019 12:17 am

Still plodding along? Have you got a deadline?

Finally finished my heads/intake (yes it does exist!)
Happy enough with how they turned out, intake gets a little choppy after .700 lift, like when the valve comes out of the chamber. Exhaust is quiet!

2.7 MCSA intake, 1.44" MCSA ex.
3.6" at the runner opening on the center runners and 3.8" outside. Manifold drops the flow #'s 2-7 cfm 😀

Photos too big to host here, let me know if the link is no good.

https://imgur.com/gallery/qlZjeDK

steve cowan
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Re: LS3 Carbed build

Post by steve cowan » Mon Jun 10, 2019 5:03 am

202ci EH wrote:
Mon Jun 10, 2019 12:17 am
Still plodding along? Have you got a deadline?

Finally finished my heads/intake (yes it does exist!)
Happy enough with how they turned out, intake gets a little choppy after .700 lift, like when the valve comes out of the chamber. Exhaust is quiet!

2.7 MCSA intake, 1.44" MCSA ex.
3.6" at the runner opening on the center runners and 3.8" outside. Manifold drops the flow #'s 2-7 cfm 😀

Photos too big to host here, let me know if the link is no good.

https://imgur.com/gallery/qlZjeDK
hey 202,
photos look good,
if thats your own work i think you have done a real nice job :D
steve c

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