What heads for a N/A 408ci?
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 706
From: Mississippi
Here is more details on the build.
http://www.superchevy.com/how-to/eng...-and-dyno-test
May the force be with you today and all goes well Mavn.
Thanks for sharing Tusky. That short duration camshaft didn't do it any favors if an NA application and my guess is the compression was less than 11:1.
Thanks for sharing Tusky. That short duration camshaft didn't do it any favors if an NA application and my guess is the compression was less than 11:1.
Thanks! Hopefully converter gets installed and car is tuned by the end of the week!
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Is this stock, milled ls3 heads, stock ls3 intake and the came posted on first page?
Edit found my answer below:
408ci
13:1 compression
247/255 .626 .604 114+5 cam
Milled .070 Stock ls3 heads with a 5 angle valve job
fast 102
17/8 headers
3" x pipe
NPP exhaust
Cars getting a circle d 4000 converter before its tuned.
On The Tree
Joined: May 2008
Posts: 160
Likes: 7
From: Michigan
What was the question again?
I never liked english when I was young until I had a teacher say-"what do you mean you dont like english? It's how you display and get across your thoughts. You can be intelligent but have poor english and you'll have a hard time getting through to anyone."
My theory is pick rough cam specs first for a street car, then the best heads in your budget.
Those are nice numbers Mavn. If I recall the Momo 235 heads made not quite as much but with a slightly smaller cam? I'm curious how the torque curve compares to Darths build.
The biggest thing I wonder is how long the valvetrain will last on the street?
No one using L8T bottom end parts yet?
Would a non stroked 6.0 or 6.2 make more hp? Rev higher?
I've gone back and forth with ls3 heads so many times, but in all the data I see comparing them to cathedrals (stock and aftermarket), the rec are always lower compression and no valve job.
Small cam and great flowing heads is my dream.
I never liked english when I was young until I had a teacher say-"what do you mean you dont like english? It's how you display and get across your thoughts. You can be intelligent but have poor english and you'll have a hard time getting through to anyone."
My theory is pick rough cam specs first for a street car, then the best heads in your budget.
Those are nice numbers Mavn. If I recall the Momo 235 heads made not quite as much but with a slightly smaller cam? I'm curious how the torque curve compares to Darths build.
The biggest thing I wonder is how long the valvetrain will last on the street?
No one using L8T bottom end parts yet?
Would a non stroked 6.0 or 6.2 make more hp? Rev higher?
I've gone back and forth with ls3 heads so many times, but in all the data I see comparing them to cathedrals (stock and aftermarket), the rec are always lower compression and no valve job.
Small cam and great flowing heads is my dream.
On The Tree
Joined: Jun 2013
Posts: 135
Likes: 12
12:1 is getting started, but low enough to still run boost. My twin turbo street car is over 11:1, so a dedicated NA car i wouldn't mess with anything under 13.
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.
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.
