Kurtis2short

iTrader: (4)

Every magazine has loved this heads on boost and they were better through the power band the Chevy ls3 cnc'd heads and the obx heads why spend 1000 when u can spend half that and spend the 500 else where for the same thing

Kurtis2short

iTrader: (4)

The Intake valves are 2.20 and exhaust is 1.60 they flow 358 the intake and 238 on the exhaust side.

67Firebird455

iTrader: (27)

They're still a thin deck head and will be prone to lifting at high boost. I'd aim for more power, and lower RPM. I don't know what your point of needing 8k is to be honest. We're not dealing with 2.0L motors here.

87silverbullet

iTrader: (11)

No 15* rectangular port head is going to flow the needs of that rpm is what I am trying to tell you. I don't care what magazine tells you what. Don't believe everthing in a magazine. That's what your problem is right now, they are feeding you pipe dreams. Those OBX headers will crack under a constant heat cycle on a track. They might work for awhile in a drag application but on a road course they will crack in the first few outings. Those heads are not what you need . As far as quality, they are beneath a stock LS3 head in my book

Still not enough. I don't know how you are going to fit that on a 4.00 bore anyway. The stock LS3 2.16/1.60 barely makes it on 4.00 bore.

A set of the Mast heads are probably you best bet in the rect head market or the TSP/PRC heads.

If it was me, I'd be ordering an AES 410 with a set of All-Pro 12-1's and a custom solid roller with a Marcella intake.

djfury05

iTrader: (30)

I say just let the guy do whatever he wants and not take any of the advice offered here. Clearly his mind has been made up on the parts selection. His problem now.

Kurtis2short

iTrader: (4)

I've been on the phone all morning ordering my custom cam and we are sticking with 7500 it's no 8000 but still sounds just as fun

67Firebird455

iTrader: (27)

Guy, safe yourself a headache, build it/set it up for no more than 7,000 and be happy with it. I'm betting with those heads and a good intake, you'll be shifting that sucker at just under 7k.

Kurtis2short

iTrader: (4)

And I gotta go 40 over on the bore

87silverbullet

iTrader: (11)

You must of fed whoever is grinding your cam a line of because those heads are still not good at a 7500 rpm range plus no machining can be done for them to accept a larger spring so a soild roller is no go with that heavy valve. It will have valvetrain problems up the ying yang.

Good luck with your endeavors. Let us know how it turns out.

Fb0dy0nly

iTrader: (10)

Its alright guys, he obviously doesnt want to take the advice given and save himself money and headaches now. He will spend and spend and break more parts, eventually it will sink it to do it right the first time with quality parts that actually fit together in a reachable goal with the funds available. The first time he goes to shift at 7500rpms and it pops out of gear and over-revs and he lifts a head or blows something apart he will realize its not the right way to do it. Unless you have a lot of $$$$ to spend to make sure the thing not only lives, but likes to live at the high rpm, dont bother, more than enough power is available below that rpm in a v8, thats the beauty of these engines, they dont need 8k rpm to make power....ITS A SINGLE CAM V8.... good luck tho. Let us know how well you are able to shift that trans at 7-8k and how long it lasts doing so...