418 ls3
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?
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?
TECH Veteran
Joined: Sep 2014
Posts: 4,891
Likes: 703
From: Mississippi
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.
TECH Veteran
Joined: Sep 2014
Posts: 4,891
Likes: 703
From: Mississippi
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.
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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TECH Addict
Joined: Sep 2010
Posts: 2,898
Likes: 467
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.
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.
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.
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.
TECH Addict
Joined: Sep 2010
Posts: 2,898
Likes: 467
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.
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.
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.
TECH Addict
Joined: Sep 2010
Posts: 2,898
Likes: 467
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.
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.
TECH Fanatic
Joined: Aug 2009
Posts: 1,841
Likes: 252
From: Coast of San Mateo County Between Pacifica & HMB
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
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
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.
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.
Switching the set up to a llsr. Ordered t&d 1.7 rockers and the cam so far will be ordering lifters as more of the machine work and blue printing is finished here are the cam specs
Solid Roller Camshaft
Maximum Street Performance / Street-Strip
Duration at .050: 247/259
110 Lobe Center Angle with a 106 Intake Centerline
Lift with 1.7 Rocker Arm Ratio: .688"/.671" Gross Lift
Recommended Displacement: 402-418 Cubic Inch Engines
Cylinder Heads: Rectangle Port
Recommended Compression Ratio: 11.0-12.0:1
Recommended Headers: 1 7/8"
Recommended Stall Converter: 3400-5000
Recommended Rear Axle Ratio: 3.73-4.30
*Specifically designed for single plane short runner intake manifolds.
When I talked to Martin Smallwood about the build he recommended no more than 11.3:1 compression any opionions on this running on 92 with 10% ethenol roughly 350ft altitude. If all goes as planned if I use nitrous I will limit it to a 250 shot max as I feel that will be the limit of the block and the cam.
Solid Roller Camshaft
Maximum Street Performance / Street-Strip
Duration at .050: 247/259
110 Lobe Center Angle with a 106 Intake Centerline
Lift with 1.7 Rocker Arm Ratio: .688"/.671" Gross Lift
Recommended Displacement: 402-418 Cubic Inch Engines
Cylinder Heads: Rectangle Port
Recommended Compression Ratio: 11.0-12.0:1
Recommended Headers: 1 7/8"
Recommended Stall Converter: 3400-5000
Recommended Rear Axle Ratio: 3.73-4.30
*Specifically designed for single plane short runner intake manifolds.
When I talked to Martin Smallwood about the build he recommended no more than 11.3:1 compression any opionions on this running on 92 with 10% ethenol roughly 350ft altitude. If all goes as planned if I use nitrous I will limit it to a 250 shot max as I feel that will be the limit of the block and the cam.