What heads for a N/A 408ci?
+1 for Mill the stock heads and have a good time
A 2.165" valve on a 4.030" isn't the gold standard, but I wouldn't say the difference is material when cost, the gains, and the goals are factored in.
A 2.165" valve on a 4.030" isn't the gold standard, but I wouldn't say the difference is material when cost, the gains, and the goals are factored in.
I run a 4.01" bore x 4" stroke and I am highly considering ls3 heads/intake manifold & tb to get myself into the 9s NA when my ls6 intake, throttle body and heads don't get me there.
Roll with it and report back to us brother!
Roll with it and report back to us brother!
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Banned
Joined: Oct 2020
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They'll all Produce about the Same Hp..... Y? Because there's Not Enough Engine Nor Air Being Asked to see the limits of any of the heads one Could/Would think of. Only major Difference will be in where Peak Tq happens and the Differences from the Baseline up to Peak.
Common thing to do is Shorten the cam and add more Lift.
When these Guys switch heads if you look Most Times They Add More Compression and or Cam/ intake. Was it the heads or All the new stuff?
If your Budget is limited 1 can use the Cheaper Head with a Cam a few degrees Shorter than What you may have Thought. Also add lift if one can to Fill the Runner. Hp is nothing more than Fuel being Burned, the More in the Bigger the Bang.
Factory Ls3 heads Want Lift. Trick a Head to make Tq Cheap.
Common thing to do is Shorten the cam and add more Lift.
When these Guys switch heads if you look Most Times They Add More Compression and or Cam/ intake. Was it the heads or All the new stuff?
If your Budget is limited 1 can use the Cheaper Head with a Cam a few degrees Shorter than What you may have Thought. Also add lift if one can to Fill the Runner. Hp is nothing more than Fuel being Burned, the More in the Bigger the Bang.
Factory Ls3 heads Want Lift. Trick a Head to make Tq Cheap.
Banned
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Hmmmm.
Good illustration..with a as is GM Head. As I said take a little back on the Cam.
if one had Ls3 heads 🤔
$450 cam to Help Vs aftermarket Heads, etc for a Non Max effort build/combination. 😒
But if you Got it Spend it. You'll never See a Brinks Truck Following a Hearse/Funeral.
https://www.hotrod.com/articles/ccrp...re-port-heads/
Good illustration..with a as is GM Head. As I said take a little back on the Cam.
if one had Ls3 heads 🤔
$450 cam to Help Vs aftermarket Heads, etc for a Non Max effort build/combination. 😒
But if you Got it Spend it. You'll never See a Brinks Truck Following a Hearse/Funeral.
https://www.hotrod.com/articles/ccrp...re-port-heads/
Last edited by Corona; Jun 3, 2021 at 12:42 PM.
2 i never race under 5k rpm. Do you?
Theres are serious questions not being a jackas$
2) The midrange and where your shifts fall are what makes it fast. I see a **** show brewing w/ that cam, those gears, that trans. That basic motor combo wants a at least a 4.10 gear, probably ideal would be a 4.30/4.56. The trans first gear of 4.00 is going to be a mf'r to make hook and so quick you'll be banging second almost immediately in-air. IDK, it's a lot of mismatched stuff. An auto trans w/ a 5k stall would make it all work a lot better, but that's not going to happen.
You can start at whatever RPM you want but you have to shift at some point. Having it feel like an NA 5.3 at 5000 and a stock 6.0 at 6000 isnt very sweet. I had a similar cam in a 416 with 3.70 gear, it wasnt as sweet as I wanted it to be, was closer to VTEC than an LS stroker. I guess you can try revving it to 8500 so it only falls to 7000 on the shift.
On The Tree
Joined: Mar 2020
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From: Weatherford TX
Depending on your budget and or goal. 243s with a good port bigger valves intake/exhaust hydraulic roller deal you can hit 650+ to the tire with some compression.
What's the end goal? Track/Street or more track?
What's the end goal? Track/Street or more track?
12 Second Club
Joined: Dec 2017
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From: San Antonio
I would use the LS3 intake, or the FAST equivalent with LS3 heads. This combo would be much cheaper, and have way more torque down low. I would also use a slightly smaller cam. That's just my preference, though. If you want to rev the **** out of it, then have at it.
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There's Rules to this 💩 if you want a good Combination.
One you don't Purchase a 3 or 4 inch Intake runner length and Don't Plan to go to 8500.
It's the Law of Avg's and Where you Grade yourself in between Idle and your Given Peak.
Gear the car Correctly for the: Rpm,Weight, and intended Use.
Pick a head 1st and its Intake. It's a Complete System.
Then cam/springs
Gear it to match ☝️.
The cam Should be Based on the cars Weight and Intended use. Should make for a great Build No Matter What head is used. 😉
One you don't Purchase a 3 or 4 inch Intake runner length and Don't Plan to go to 8500.
It's the Law of Avg's and Where you Grade yourself in between Idle and your Given Peak.
Gear the car Correctly for the: Rpm,Weight, and intended Use.
Pick a head 1st and its Intake. It's a Complete System.
Then cam/springs
Gear it to match ☝️.
The cam Should be Based on the cars Weight and Intended use. Should make for a great Build No Matter What head is used. 😉
