What cylinder head for my 415ci? *Advice needed*
What cylinder head for my 415ci? *Advice needed* ShortBlock Specs:
Iron Block lq4 bored 4.065
Eagle 4.00" crank/rods/arp rod bolts
diamond custom flat top -5.5cc pistons
total seal ap rings set
Comp XE R lobes, 238/244@.050 114+2 cam
ect....
Ive had the hardest time picking a head for this motor.
Goals:
12:1 or higher compression(the more the better)
500rwhp na and 7xx+ nitrous tune while using a port matched ls6 intake manifold
I need to know if an aftermarket head is worth that much more than a stock cast. To me, in the big picture, a 10 to 20 hp difference between a cnc stock cast and aftermarket head for a price difference of 1000 dollars is not reasonable, as if i want to make up the power ill just change the jets in my nitrous and fuel lines.
So any advise you guys my have for me would be much appreciated as im looking to purchase some new heads in the next week or two. Thanks
Iron Block lq4 bored 4.065
Eagle 4.00" crank/rods/arp rod bolts
diamond custom flat top -5.5cc pistons
total seal ap rings set
Comp XE R lobes, 238/244@.050 114+2 cam
ect....
Ive had the hardest time picking a head for this motor.
Goals:
12:1 or higher compression(the more the better)
500rwhp na and 7xx+ nitrous tune while using a port matched ls6 intake manifold
I need to know if an aftermarket head is worth that much more than a stock cast. To me, in the big picture, a 10 to 20 hp difference between a cnc stock cast and aftermarket head for a price difference of 1000 dollars is not reasonable, as if i want to make up the power ill just change the jets in my nitrous and fuel lines.
So any advise you guys my have for me would be much appreciated as im looking to purchase some new heads in the next week or two. Thanks
The LS7 heads really need 4.10" bore sizes as a bare minimum, so they don't really fit this build. You could look into L92 heads, but those large chambers will not help you reach the compression goals you stated. A 61cc chamber with a .040" thick gasket and the short-block you listed will net you right at 12.50:1 SCR. You can get that chamber size via a 5.3L head or a milled LS6 head if you want GM castings. If you're looking at the aftermarket, AFR and TrickFlow both offer cylinder heads that will do the trick and get you very nice power.
We offer all of the above and can help you choose a head that fits your needs and goals best! Let us know if we can help
We offer all of the above and can help you choose a head that fits your needs and goals best! Let us know if we can help
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
If you search on Ebay you'll find a guy who sells bare All Pro castings for $700 including guides. They're as cast, but you can have them finished for $150 to have the guides installed and $180-200 for a good valve job. You'll need springs and valves, but you can get valves for $240 and springs for $250. You'll have a 230cc after market casting with a thick deck, solid rocker pad, 1/2 inch pushrod holes, etc... for $1600. That's about the same as you'd be able to get a set of stock ported castings for.
They come with 64cc chambers. My local head place only charges $70 for a mill. Mill .021 and you'll be good to go according to Matt@TSP's calculations.
They come with 64cc chambers. My local head place only charges $70 for a mill. Mill .021 and you'll be good to go according to Matt@TSP's calculations.
TECH Apprentice
Joined: Oct 2007
Posts: 385
Likes: 0
From: Granada Hills, Ca
have you had any experience with porting them? I am just wondering why they fall off so severely at .600 lift. Have you built any high compression 400+ inches with these heads?
