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418 ls3

 
Old 06-08-2019, 04:30 PM
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Default 418 ls3

Building a 418 ls3 with the following components
sps cnc ported ls3 cylinder heads yet to be milled
yet to purchase but the plan is a cid be4.0 ls3 intake efi
Wiseco pistons are flat tops with 4cc reliefs
k1 crank and rods
arp main and head studs
1 7/8 stainless headers
get em garage piston squirters
mellings 10355 oil pump
contemplating aftermarket oil pan as recommend by Martin Smallwood
Accufab dominator throttle body
seimens 60lb injectors
want to send the intake to have a nitrous outlet puck installed just don't know what my nitrous limit would be with the 4.080 in a ls3 block
was gonna order a cam motion stroker king llsr but had to budget so was gonna order the stroker king hydraulic which is
Duration at .050: 242/254
110 Lobe Center Angle with a 106 Intake Centerline
Lift with 1.7 Rocker Arm Ratio: .621"/.604"
my current cam from my cathedral build that I have on hand is
Duration at .050: 244/254
113+2 Lobe Center Angle with a unknown at the moment Intake Centerline
Lift with 1.7 Rocker Arm Ratio: .620"/.620"
should I just run the cam I have or order the cam motion one
goal compression is mid 11s
shooting for 550rwhp or better before the bottle it's an auto car also
Any recommendations major changes I should make?
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Old 06-08-2019, 05:31 PM
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Looks good. What kind of car is this going into ?
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Old 06-08-2019, 05:55 PM
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Originally Posted by Tuskyz28 View Post
Looks good. What kind of car is this going into ?
1984 hurst olds cutlass with lightening rod shifters would you run the cam I have or order the cam motion one
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Old 06-08-2019, 06:18 PM
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Originally Posted by Da Reazon View Post
1984 hurst olds cutlass with lightening rod shifters would you run the cam I have or order the cam motion one
Honestly, I would talk to cam motion about that cam. Some cams respond well to nitrous while others don't. You should run 11s on motor no matter what even with the cam you do have. My buddie running a 86 SS monte carlo. His car have a similar build as you is planning. He runs 7.1X in the 1/8. His combo is a 416ci with ported LS3 heads/Victor JR intake/BTR stroker cam. His car is a full interior car with a 4L80E.

My tips~ don't be scared to use the proper stall to get what you want out of the car.
G-body cars tend to be tricky on the suspension... so may sure you spend a lil extra money and attention to detail there.
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Old 06-08-2019, 06:29 PM
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Old 06-08-2019, 07:13 PM
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Originally Posted by Tuskyz28 View Post
Honestly, I would talk to cam motion about that cam. Some cams respond well to nitrous while others don't. You should run 11s on motor no matter what even with the cam you do have. My buddie running a 86 SS monte carlo. His car have a similar build as you is planning. He runs 7.1X in the 1/8. His combo is a 416ci with ported LS3 heads/Victor JR intake/BTR stroker cam. His car is a full interior car with a 4L80E.

My tips~ don't be scared to use the proper stall to get what you want out of the car.
G-body cars tend to be tricky on the suspension... so may sure you spend a lil extra money and attention to detail there.
Yep I have a fti 4000 hard hit that flashed to 5000 or 5500 behind my 408 that dynoed 440rwhp w
Originally Posted by Tuskyz28 View Post
That car is bad *** been seeing it pop up on instagram kinda makes me want to carb this setup
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Old 06-08-2019, 07:44 PM
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Originally Posted by Da Reazon View Post

... kinda makes me want to carb this setup
Welcome to the Stone Age.....
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Old 06-08-2019, 08:28 PM
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Originally Posted by G Atsma View Post
Welcome to the Stone Age.....
Tell me about it at this rate may as well go back big block
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Old 06-08-2019, 09:11 PM
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Originally Posted by Da Reazon View Post
Tell me about it at this rate may as well go back big block
..with a carb.... and distributor! lol
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Old 06-09-2019, 12:47 AM
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Hey man,
The street king hydraulic specs for the square port heads are 244/256 112 LSA +4.
The LLSR version would have larger duration numbers than this to account for the lash.
If you are going to set this engine up for a hit of nitrous it is best to open the exhaust a little earlier
So I would recommend getting that stroker king camshaft on a 113 LSA +4 so your evo is at 65. This will be a good compromise and will still drive well on the street,
However you will need to mill your heads to get your compression up to at least 11:5.1 for maximum performance.
This will work well.
Brian Tooley has a dedicated nitrous camshaft but with 35 degrees of overlap it will not drive well but is mental with the bottle.
It's a 252/266 112 LSA +3.
35 degrees of overlap is just too much.
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Old 06-09-2019, 03:41 AM
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Originally Posted by bortous View Post
Hey man,
The street king hydraulic specs for the square port heads are 244/256 112 LSA +4.
The LLSR version would have larger duration numbers than this to account for the lash.
If you are going to set this engine up for a hit of nitrous it is best to open the exhaust a little earlier
So I would recommend getting that stroker king camshaft on a 113 LSA +4 so your evo is at 65. This will be a good compromise and will still drive well on the street,
However you will need to mill your heads to get your compression up to at least 11:5.1 for maximum performance.
This will work well.
Brian Tooley has a dedicated nitrous camshaft but with 35 degrees of overlap it will not drive well but is mental with the bottle.
It's a 252/266 112 LSA +3.
35 degrees of overlap is just too much.
so the 244/254 113+2 should work decent as that is the cam I have on hand?
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Old 06-09-2019, 05:00 AM
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Originally Posted by Da Reazon View Post
so the 244/254 113+2 should work decent as that is the cam I have on hand?
It will if you advance it 2 more degrees so your IVC is at 51 and your EVO at 64.
If you had 2 extra degrees of exhaust duration it would help it a little more in the top end as it would open 1 degree earlier especially for nitrous.
With your current cam advanced 4 degrees your overlap is intake biased which means your power will come on a little earlier but will also begin falling off a little earlier.
Before I continue, is that a street car or racing or both?

Because I might have another suggestion for you.
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Old 06-09-2019, 10:58 AM
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Originally Posted by bortous View Post
It will if you advance it 2 more degrees so your IVC is at 51 and your EVO at 64.
If you had 2 extra degrees of exhaust duration it would help it a little more in the top end as it would open 1 degree earlier especially for nitrous.
With your current cam advanced 4 degrees your overlap is intake biased which means your power will come on a little earlier but will also begin falling off a little earlier.
Before I continue, is that a street car or racing or both?

Because I might have another suggestion for you.
Both street/strip car
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Old 06-09-2019, 11:30 AM
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If it's a street strip car I would recommend you make a compromise right in the middle.
Get something that will drive somewhat decent on the street, and be explosive down the track,
For Nitrous you need more exhaust duration and for the overlap to be more exhaust biased.
I would do a smaller version of Brian Tooley's nitrous camshaft.
246/260 114 LSA +4.
It has the same valve events as Tooley's camshaft but with 25 degrees overlap for better driveability.
However, as an NA grind it will be a bit flat low down and will begin coming alive after 3000rpm.
It's also recommended for nitrous to get the exhaust port set up at a 50 degree angle for optimum performance.
Not required but it will help.
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Old 06-09-2019, 11:36 AM
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For a 50/50 street/strip car the cam you have now is pretty good IMO, could it be better ...sure,
but as long as you don't go more than 200-250 with spray you should be pretty good.
The sps heads have a better E/I ratio than OE LS3 heads and will help as well, the wider LSA
will tune and drive better on the street. A 3 inch dual exhaust with X pipe is strongly
recommended as well.
my .02
Good Luck
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Old 06-09-2019, 02:08 PM
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If it is a street strip car, just cam for the street.

Figure how many miles you drive in a year. Take a day at the track and 28 passes. That is seven miles. The other 9000 miles you have to live with.
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Old 06-09-2019, 02:39 PM
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The other guys have good points too.
If you take advice from one of the members here you will do fine.
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Old 06-09-2019, 03:03 PM
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Gotta agree with Darth here too. Call it the 99% rule, because 99% of driving is street usage.
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