370" LLSR 243 Heads Build
04-08-2018, 03:45 PM
#1
370" LLSR 243 Heads Build I'd like to get opinions and/or advice on my projected build.
My goals are to run low 11s but will be trying for high 10s all motor. Low 11s I'd be happy with though. Im not too concerned with dyno numbers but would like to see 430-460whp.
My combo I am wanting to do is a 370" LQ4 11.5-.6:1 CR, LLSR cam spec'd by Darth, stock 243s or ported 243s (will decide before motor goes in the car) and eventually a fast intake or MSD intake. Will run with a stock LS6 intake for a little while. 1 7/8th longtubes with 3" cat back more than likely.
Would this combo yield good results? It's a 90% street car and 10% track. Is it at least capable of hitting my goals is really all I'm wondering?
Thanks to anyone who has input!
My goals are to run low 11s but will be trying for high 10s all motor. Low 11s I'd be happy with though. Im not too concerned with dyno numbers but would like to see 430-460whp.
My combo I am wanting to do is a 370" LQ4 11.5-.6:1 CR, LLSR cam spec'd by Darth, stock 243s or ported 243s (will decide before motor goes in the car) and eventually a fast intake or MSD intake. Will run with a stock LS6 intake for a little while. 1 7/8th longtubes with 3" cat back more than likely.
Would this combo yield good results? It's a 90% street car and 10% track. Is it at least capable of hitting my goals is really all I'm wondering?
Thanks to anyone who has input!
04-08-2018, 04:29 PM
#2
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Well ported 243s,MMS MSD, ~11.5:1 Comp, and Schmedium
LLSR should make ~450+ RWHP through a M6 & 3" True Duals,
and be pretty street able (~238*/244* .660"/.640") Darths LSA + Adv.
Just my .02.
LLSR should make ~450+ RWHP through a M6 & 3" True Duals,
and be pretty street able (~238*/244* .660"/.640") Darths LSA + Adv.
Just my .02.
04-08-2018, 04:51 PM
#4
I'm still failing to see the point in the popularity of tiny SR's all of a sudden, but you should have no problem reaching your goals. My train of thought is, if you only want 430-460rwhp and it is 90% street, why not just stay HR and not worry about adjustable rockers, hot and cold lash setting, 10k valvetrain inspections, etc?
SR cam's can have TONS of benefits, and I am a huge fan of them (having spec'd a low lash/pressure fed lifter streetable SR setup before it was "cool"), but the benefits are most apparent in high RPM big power builds...not 23x duration street cars. They make a ton of sense in beastly 600+rwhp NA setups like Hammer...but for 450rwhp and 90% street I'd stay HR all day.
SR cam's can have TONS of benefits, and I am a huge fan of them (having spec'd a low lash/pressure fed lifter streetable SR setup before it was "cool"), but the benefits are most apparent in high RPM big power builds...not 23x duration street cars. They make a ton of sense in beastly 600+rwhp NA setups like Hammer...but for 450rwhp and 90% street I'd stay HR all day.
04-08-2018, 04:56 PM
#5
I'm still failing to see the point in the popularity of tiny SR's all of a sudden, but you should have no problem reaching your goals. My train of thought is, if you only want 430-460rwhp and it is 90% street, why not just stay HR and not worry about adjustable rockers, hot and cold lash setting, 10k valvetrain inspections, etc?
SR cam's can have TONS of benefits, and I am a huge fan of them (having spec'd a low lash/pressure fed lifter streetable SR setup before it was "cool"), but the benefits are most apparent in high RPM big power builds...not 23x duration street cars. They make a ton of sense in beastly 600+rwhp NA setups like Hammer...but for 450rwhp and 90% street I'd stay HR all day.
SR cam's can have TONS of benefits, and I am a huge fan of them (having spec'd a low lash/pressure fed lifter streetable SR setup before it was "cool"), but the benefits are most apparent in high RPM big power builds...not 23x duration street cars. They make a ton of sense in beastly 600+rwhp NA setups like Hammer...but for 450rwhp and 90% street I'd stay HR all day.
Boom. LLSR.
04-08-2018, 05:04 PM
#6
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Originally Posted by Puck
I'm still failing to see the point in the popularity of tiny SR's all of a sudden, but you should have no problem reaching your goals. My train of thought is, if you only want 430-460rwhp and it is 90% street, why not just stay HR and not worry about adjustable rockers, hot and cold lash setting, 10k valvetrain inspections, etc?
SR cam's can have TONS of benefits, and I am a huge fan of them (having spec'd a low lash/pressure fed lifter streetable SR setup before it was "cool"), but the benefits are most apparent in high RPM big power builds...not 23x duration street cars. They make a ton of sense in beastly 600+rwhp NA setups like Hammer...but for 450rwhp and 90% street I'd stay HR all day.
SR cam's can have TONS of benefits, and I am a huge fan of them (having spec'd a low lash/pressure fed lifter streetable SR setup before it was "cool"), but the benefits are most apparent in high RPM big power builds...not 23x duration street cars. They make a ton of sense in beastly 600+rwhp NA setups like Hammer...but for 450rwhp and 90% street I'd stay HR all day.
04-08-2018, 05:07 PM
#7
From what I have been told by Darth is LLSR is not much, if any, more pricey than a hydraulic setup. I need to do more info on LLSRs tbh but Darth has convinced me to go that route basically. Says if I follow his route of installation, should only have to lash and adjust once and leave it. I was worried about all the maintenance that comes along with LLSRs but Darth has convinced me otherwise.
I am using 430-460whp as a low expectation. I'm not gonna be that guy who shoots for 900 NA horsepower and only makes 420 realistically. The combo I think would make more than 450whp but if it makes in between 430-460whp then I'll be happy. If it makes more than 460 then I'll be ecstatic. Which it could easily make 460 (I think) depending on size of the LLSR which I don't want to go small. I'm just setting the bar low so I won't be disappointed. Also, once again, not extremely concerned with dyno numbers because this will be through a stalled auto.
My track goals are more important to me. And I think going LLSR my track goals will be easier to achieve with not much more cost or valvetrain maintenance (if I do it Darth's way).
I could very well possibly go back to hydraulic roller. I've got some time. I'm still in the idea phase of the build.
I am using 430-460whp as a low expectation. I'm not gonna be that guy who shoots for 900 NA horsepower and only makes 420 realistically. The combo I think would make more than 450whp but if it makes in between 430-460whp then I'll be happy. If it makes more than 460 then I'll be ecstatic. Which it could easily make 460 (I think) depending on size of the LLSR which I don't want to go small. I'm just setting the bar low so I won't be disappointed. Also, once again, not extremely concerned with dyno numbers because this will be through a stalled auto.
My track goals are more important to me. And I think going LLSR my track goals will be easier to achieve with not much more cost or valvetrain maintenance (if I do it Darth's way).
I could very well possibly go back to hydraulic roller. I've got some time. I'm still in the idea phase of the build.
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04-08-2018, 05:24 PM
#9
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I run a 370 LQ9 with 11.5:1 compression, and with the mods in my sig, I'm making right around 450 rwhp n/a. With the setup you're planning on I'm sure you'll see every bit of that
04-09-2018, 06:16 AM
#10
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Hot rod mag did a 370ci with a set of AFR 230s out the box and a basic HR 231/239 cam. Fast 102mm intake as well. Motor made 590 horses at the crank.
04-09-2018, 08:27 PM
#12
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