418 Build N/A High Compression
Thread Starter
Joined: Apr 2017
Posts: 305
Likes: 11
From: Washington NC
418 Build N/A High Compression At the beginning of 2018 I built a high revving stock cubic inch ls3 for my ford focus. After lots of issues with valve train I finally made some progress and then I spun a rod bearing. After that I decided to add a 4 inch crank and put it back together. No finally I am in the short roads and it should be running soon. Motor made 550 rwhp before.
New motor specs
4.08 JE pistons 2.77 CC Dome
K1 4 inch Crank
K1 Rods
Trick Flow 255 Heads with hollow intake valves
Crower shaft rockers
Cam Motion Cam Solid Roller 255Intake 271Exhaust
Sheet Metal 102mm intake
2inch Headers
3 inch dual exhaust
13.7:1 Compression Ratio
New motor specs
4.08 JE pistons 2.77 CC Dome
K1 4 inch Crank
K1 Rods
Trick Flow 255 Heads with hollow intake valves
Crower shaft rockers
Cam Motion Cam Solid Roller 255Intake 271Exhaust
Sheet Metal 102mm intake
2inch Headers
3 inch dual exhaust
13.7:1 Compression Ratio
Thread Starter
Joined: Apr 2017
Posts: 305
Likes: 11
From: Washington NC
Honestly they spec'ed the cam for my old engine which was stock displacement. I had intended to turn 8500ish rpms with the old motor. Not sure where the new motor will turn to. I will probably end up getting a new cam once i get a baseline. I will post the cam specs when i find them.
Thread Starter
Joined: Apr 2017
Posts: 305
Likes: 11
From: Washington NC
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My original plan was six months ago. After moving into my house my wife wanted to remove a wall, which turned into discovering the foundation was off so I had to build a new footing and pier to properly support the house.
Then, right before we were going to order the steel beam to knock out the wall, discovered a water leak which turned out to be a failed shower surround. Removed shower mold everywhere.
Couple that with 85%+ travel.
Short answer, no idea. I do know I will do heads first. The car is driving nice and right now that's what I need out of it. I am working with a guy who is doing his ITB so maybe we will both know something whenever he is ready to reveal
Then, right before we were going to order the steel beam to knock out the wall, discovered a water leak which turned out to be a failed shower surround. Removed shower mold everywhere.
Couple that with 85%+ travel.
Short answer, no idea. I do know I will do heads first. The car is driving nice and right now that's what I need out of it. I am working with a guy who is doing his ITB so maybe we will both know something whenever he is ready to reveal
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Verdad Gallardo Thread Starter
Joined: Apr 2017
Posts: 305
Likes: 11
From: Washington NC
My original plan was six months ago. After moving into my house my wife wanted to remove a wall, which turned into discovering the foundation was off so I had to build a new footing and pier to properly support the house.
Then, right before we were going to order the steel beam to knock out the wall, discovered a water leak which turned out to be a failed shower surround. Removed shower mold everywhere.
Couple that with 85%+ travel.
Short answer, no idea. I do know I will do heads first. The car is driving nice and right now that's what I need out of it. I am working with a guy who is doing his ITB so maybe we will both know something whenever he is ready to reveal
Then, right before we were going to order the steel beam to knock out the wall, discovered a water leak which turned out to be a failed shower surround. Removed shower mold everywhere.
Couple that with 85%+ travel.
Short answer, no idea. I do know I will do heads first. The car is driving nice and right now that's what I need out of it. I am working with a guy who is doing his ITB so maybe we will both know something whenever he is ready to reveal
I understand completely. We moved last year which is why it has taken so long to get back to building it.
I am thinking about getting a holley high ram and shortening the runners for hood clearance. Not sure though.
Also I am trying to figure out whether it is worth having the heads ported more. The trick flows are pretty good from the factory but mamo says he can get another 10-15cfm s out of them.
Thread Starter
Joined: Apr 2017
Posts: 305
Likes: 11
From: Washington NC
If the 10-15cfm makes it through the intake... 1cfm is about 2.2HP.
A lot of what you see is the intakes homogenizing heads. So it's actually better to spend more on a better intake than worry about trying to extract another 5-10cfm from the heads. Though, the better the head, the more it pulls through the intake. But it's cheaper to port an intake than fondle heads hoping for another 3HP.
A lot of what you see is the intakes homogenizing heads. So it's actually better to spend more on a better intake than worry about trying to extract another 5-10cfm from the heads. Though, the better the head, the more it pulls through the intake. But it's cheaper to port an intake than fondle heads hoping for another 3HP.
Did you select pushrod length yet for this build? Curious as I used those same rocker assemblies with the AFR LS3 heads and ended up 1 inch longer than stock length using LLSR cam with comp solids.
Thread Starter
Joined: Apr 2017
Posts: 305
Likes: 11
From: Washington NC
Yeah i will check when i get back to the shop. Cant remember the length but they are long
Can't wait to see you dyno this thing! Very similar to my plans, except I'll be ~12:1, using 285cc LS7 heads, and a 428 at 4.130" instead of a 418 at 4.080".
With a 4" stroke I think you're going to be finding the limit of the 255cc intake port.
With a 4" stroke I think you're going to be finding the limit of the 255cc intake port.
I understand completely. We moved last year which is why it has taken so long to get back to building it.
I am thinking about getting a holley high ram and shortening the runners for hood clearance. Not sure though.
Also I am trying to figure out whether it is worth having the heads ported more. The trick flows are pretty good from the factory but mamo says he can get another 10-15cfm s out of them.
I am thinking about getting a holley high ram and shortening the runners for hood clearance. Not sure though.
Also I am trying to figure out whether it is worth having the heads ported more. The trick flows are pretty good from the factory but mamo says he can get another 10-15cfm s out of them.