550 rwhp possible?
But I think for someone stock cubes depending on what you want to spend you could have better heads. Heres my gripes and why:
Valve shrouding
Ptv clearance. Unless you want to flycut youre not gonna run a decent sized cam. And with that you wont be able to mill for extra compression either.
There are so many proven cathedral setups that flow big air through a small port for velocity and that crisp throttle response and give you the ptv clearance to mill and run a healthy cam. There's stock bottom end 6.0 putting down 500whp.
If you want a budget $1500 head and intake swap then sure do the ls3 top end. But if youre willing to spend some more you could have a better setup.
OR consider having tea or now I see ballistic speed doing the 2.08 and 1.59 valves in the ls3 heads so these issues above are addressed and they make good power. But, again thats gonna be a lot more than some stock head.
Dont take it as hating on ls3 stuff, I think its great and im ru ning it on my 408 but I think they have their place. Oh and for the record my ls3 heads are small bore and on a different valve angle
Last edited by Tainted; Feb 28, 2013 at 09:30 PM.
Yea and thats half the problem. People see the price and then the flow numbers. But heres the reality of it for people with 4.030 and smaller bores.
Valve shrouding. Period.
Limited ptv clearance.
Limited to mill from lack of ptv clearance.
Next is the huge *** intake runner. Yeah it flows good but guess what, other heads flow just as well through A WAY SMALLER RUNNER. Same amount of air through a smaller port means velocity.
Its a great thing too, it helps with torque, low end power, throttle response etc
If you got a stroker engine you are able to get away with it moreso because the engine can actually move all that air.
Once again, ls3 stuff is great, BUT they have their place. And on stock cube engines with 4.030 and smaller bores (if you have the budget) then I strongly believe a set of quality ported cathedrals or a prc afr tfs head would be much more ideal and allow more ptv clearance fir big cams more milling and no shrouding.
Now saying all that its been proven plenty of time you can still make good power. If youre on a budget theyre hard to beat.
Valve shrouding. Period.
Limited ptv clearance.
Limited to mill from lack of ptv clearance.
Next is the huge *** intake runner. Yeah it flows good but guess what, other heads flow just as well through A WAY SMALLER RUNNER. Same amount of air through a smaller port means velocity.
Its a great thing too, it helps with torque, low end power, throttle response etc
If you got a stroker engine you are able to get away with it moreso because the engine can actually move all that air.
Once again, ls3 stuff is great, BUT they have their place. And on stock cube engines with 4.030 and smaller bores (if you have the budget) then I strongly believe a set of quality ported cathedrals or a prc afr tfs head would be much more ideal and allow more ptv clearance fir big cams more milling and no shrouding.
Now saying all that its been proven plenty of time you can still make good power. If youre on a budget theyre hard to beat.
Last edited by Tainted; Mar 1, 2013 at 07:52 PM.
good point tainted. i like ur aspects and knowledge of what im trying to accomplish. cant wait for the upgrade. but still like in my other thread when me n u had long convo about cylinder head choice. if u could go back there i still need helping decide what size head to get... 210, 215, 225 or like u said theyve upgraded to 230, or 235. thanks buddy
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Verdad Gallardo good point tainted. i like ur aspects and knowledge of what im trying to accomplish. cant wait for the upgrade. but still like in my other thread when me n u had long convo about cylinder head choice. if u could go back there i still need helping decide what size head to get... 210, 215, 225 or like u said theyve upgraded to 230, or 235. thanks buddy
i've struggled with building ls1, go ls2 stroker etc etc. i came to the conclusion i need to do a ls3 swap and start there. bolt on motors go 420+ whp, not to mention the 4 1/8 bore to start is awesome. cam only fast intake motors knock on 500. hell after selling a working ls1 engine you could prob get a ls3 for 2500 or so. even if you figure another 500 in adaption parts, that's still cheaper than a set of "good" heads for a ls1.
The reason I am staying with my 799's and having them ported buy TEA. Talked to Brain Tooley about the power that can be had with these heads with their port job and I am very impressed. My heads will be somewhere around 226 cc when they are done, for my 402.
