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ls1 s/s notch on 28s
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the tb being in direct site of the runners is best..your rpm range is where mine will live,just im 364ci. i grabbed the sniper because i seen it was dual an on clearance but most of all in stock vs waiting more time an new its make more power then a vic jr which was my other option in the range i wanted to spend..(its a budget sbe build)..ill snap a pic or 2 of the setup..im still waiting on my 102mm to 4150 adapter so i can get a pic of both easy right now...its tall though.think its like 14" tall..larger then what i though..i still need to trim down the velocity stacks i have for the setup so the tb have a radius to them an do a air pan under being i have a hood scoop.
 

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ls1 s/s notch on 28s
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26,049 Posts
Only bad about the cbm adapter is it necks down to 92mm🤦‍♂️. but im going to hit it with a burr an open it up along with making sure it blends to the 4150 pad on the intake better...im sure i got all the cfm it can handle though per calculator wise..but efi engine data dont lie..toss all the tb u can at it.
255949

255950
 

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I certainly appreciate all the input fellas. Feel free to keep it coming as I haven't ordered intake or cam yet.
Here's a Build I Really Base mines off of.
Now here's the Kicker in the Balls for the Avg guy Who doesn't Get it.

If this Build Were say 4.030 X 4.00 with the same Compression/Cam etc Would it not make Similar Hp but @ a Higher Rpm? Loss of Tq would be small 4.100 vs 4.00.
4.075 vs .030 is a wash.

My thing is Find a build on the lines of What someone may Want and add to there Thought or just Keep it simple and Duplicate what's seen.
Hmmmmm 🤔 my 408 with Stevens 402 size and a cam A bit bigger than this guy + more Compression than Both. 😉

 

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His cam 256/265 .754/.747" 108 ICL 112

My cam 260/272 .730/.730 109 ICL 113


His compression 11.5

My compression 12.2 min.

Think the 408 would make Similar Hp?

Basic idea of I may not have what you've got but I can Duplicate the Power level or be right there. See one, out think the Differences if Any. Duplicate. They give us the Answers looked 4, Typically.
 

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🤫
 

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Banksters Paradise
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Man, seems like its easier to make power with a carb, cheaper too
I think carb will make more power. Cheaper depends on which parts you use. I decided to stay with efi because street car and my cam has 30 degrees overlap and only 364ci (i wanted to see how fast it can be with stock stroke, before building a bigger engine)

With efi i can tune every different part throttle easy, tune the lean or rich spots with the laptop in minutes. Was afraid that going to a carb, on the street the part throttles would have moments of running much too lean or too rich and i'd end up messing with it for months to get it right and the thought of messing with carbs just turned me off after being able to tune with a laptop.

If i wanted to go for all out best ET possible at the track, for a 408ci i'd probably go 4500 super vic, 2 circuit 1050 dominator, and even use a moroso cool can.
 

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ls1 s/s notch on 28s
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Carb might look it..but figure $700 for a decent carb..another $50 in jets an squirters,$350 for msd ign an another $200 for a wide ban..so your $1300 in with out fuel pump an reg..holley term x is 1k with 3.5" screen an then grab stock 5.3 flex fuel 52lb injectors for $100..i paid $125 for decapped ones that flow 80lbs...g plus 102mm tb is $60 an most intakes come with rails..pqy $30 regulator works fine so your basically around the same price an cbm makes the 4150 to 90-102mm tb adapter..they run $95 shipped for natural finish..


The holley software is pretty easy..i love how it logs everything an when looking at logs if you forgot to log something you can just check it an all the info will be right there vs say hp tuners if you aint click the channel its not getting logged..

Only bad is holley shits impossible to get right now it seems..im thinking about trying a ft550..its not much more then a term x with a 7" digital dash.
 

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Discussion Starter · #29 ·
Carb might look it..but figure $700 for a decent carb..another $50 in jets an squirters,$350 for msd ign an another $200 for a wide ban..so your $1300 in with out fuel pump an reg..holley term x is 1k with 3.5" screen an then grab stock 5.3 flex fuel 52lb injectors for $100..i paid $125 for decapped ones that flow 80lbs...g plus 102mm tb is $60 an most intakes come with rails..pqy $30 regulator works fine so your basically around the same price an cbm makes the 4150 to 90-102mm tb adapter..they run $95 shipped for natural finish..


The holley software is pretty easy..i love how it logs everything an when looking at logs if you forgot to log something you can just check it an all the info will be right there vs say hp tuners if you aint click the channel its not getting logged..

Only bad is holley shits impossible to get right now it seems..im thinking about trying a ft550..its not much more then a term x with a 7" digital dash.
I already have the dominator efi with almost everything except injector harness. You sayin get the super vic and put the 102 on it?
 

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ls1 s/s notch on 28s
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26,049 Posts
on a 408 id get super vic 4500 if willing to get a 4500tb,if not then id get a holley split 4150 with a 102mm.the cbm adapter with a 102 would be nice on the split if you have the clearance. a low 4150 tb like a fast would probably not hurt it to bad an be better for cruising but end up more then a 102 hi ram price wise by $100 or so id guess. an the 4150 fast an 102 would make close to the same power.

the ivc on the cam will be not to far apart..the single planes will want a sooner ivc event because of the runner length.. alot of datas been shared so you can look at tq an hp in the given rpm range you expect the combo to mostly live it an then go with that.
 

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ls1 s/s notch on 28s
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26,049 Posts
His cam 256/265 .754/.747" 108 ICL 112

My cam 260/272 .730/.730 109 ICL 113


His compression 11.5

My compression 12.2 min.

Think the 408 would make Similar Hp?

Basic idea of I may not have what you've got but I can Duplicate the Power level or be right there. See one, out think the Differences if Any. Duplicate. They give us the Answers looked 4, Typically.
IVO is 20.0 ° BTDC ( - indicates ATDC)
IVC is 56.0 ° ABDC
EVO is 68.5 ° BBDC
EVC is 16.5 ° ATDC ( - indicates BTDC)
Overlap is 36.5 °

IVO is 21.0 ° BTDC ( - indicates ATDC)
IVC is 59.0 ° ABDC
EVO is 73.0 ° BBDC
EVC is 19.0 ° ATDC ( - indicates BTDC)
Overlap is 40 °

i dont know your head info but theres the valve events..your less stroke so you dont need that late of a ivc number if the same intake setup was used unless you had a less eff. head.. being your less stroke an the valve events of yours you should be 600 or so rpms higher if the same valve train was used including lobes.

my events are 8ivo,52ivc,66evo,10evc an 18 overlap on my motor picked above..forgot 12.5-1 comp 364ci
 

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His cam 256/265 .754/.747" 108 ICL 112

My cam 260/272 .730/.730 109 ICL 113


His compression 11.5

My compression 12.2 min.

Think the 408 would make Similar Hp?

Basic idea of I may not have what you've got but I can Duplicate the Power level or be right there. See one, out think the Differences if Any. Duplicate. They give us the Answers looked 4, Typically.
Looks like a healthy cam DM. I'd expect similar hp at 400rpm higher (with stable valve train) and similar head/induction combo.
 

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Original cam had 2 much lift with 1.8 rocker arms. Made by Martin @ Tick @ the time.

Had it Reground Not Knowing just look and match as close as possible... Figure I could move the ICL to get the Original IVC.
256/270 .714"/.714" 113+5


Btw the Bigger the Valve with a smaller bore Wants a later IVC.

Ls7 head:
2.20 intake valve used with my 408 has a 62 IVC. Cam Motion spec'ed.
 

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ls1 s/s notch on 28s
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Only once that bigger valve starts shrouding or way over the norm 52/53% ratio then yes because your hindering the flow so cylinder fill time will change.
 
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