LS7 vs. LS376/525
Thread Starter
Staging Lane
Joined: Oct 2007
Posts: 74
Likes: 1
From: Sweden
If I'm not mistaken....the 430 hp. Crate and the 525 both have .525 lift cams.........how the f*** can that be.....look it up....i **** u not...
stock ls3 430
204/211. .551/.525 117 LSA
525HP.
226/236. .525/.525. 110 LSA
DOES THE DURATION AND LSA REALLY ADD THAT MUCH.....DIFFERENCES SEEM SO MINIMAL
WHERE THE HECK IS 95HP COMING FROM??
stock ls3 430
204/211. .551/.525 117 LSA
525HP.
226/236. .525/.525. 110 LSA
DOES THE DURATION AND LSA REALLY ADD THAT MUCH.....DIFFERENCES SEEM SO MINIMAL
WHERE THE HECK IS 95HP COMING FROM??
As a comparison I gained about 50whp from my LS7 when going for a much bigger cam:
LS7 stock 211/230 .591/.591 LSA 121 overlap -21.5
GMPP stg 3 233/276 .630/.630 LSA 107 overlap +40.5
Not sure exactly what that would convert into in engine gains with a 5-speed manual transmission but I would be surprised if it's even close to the 95 claimed hp from the LS376/525 over the standard LS3.
Also it's a bitch to drive with that huge overlap, it does not like to be below 2k rpms at all
But that cam needs to go regardless with the new MX-5 project, I'll just swap back the stock cam first and then maybe later on I'll look for something a lot more street friendly down the road.As a general update I ordered the LS376/480 and I'm currently waiting for a boat to pick it up in Houston and ship it to me in Sweden
The 430HP LS3 rating comes from testing per the SAE standard that all emissions controlled vehicles in the States use to come up with their power/torque numbers. That was the rating in the C6 Corvette application. The 525HP number is GMPP's rating for a non-emissions compliant crate engine -- doubt seriously that it was tested to the same SAE standard as the OEM LS3 was. So - you can't compare the 430 and 525 and conclude, with certainty, that one engine will make 95 more HP than the other. Good compromise on the 376/480....
Thread Starter
Staging Lane
Joined: Oct 2007
Posts: 74
Likes: 1
From: Sweden
Yea, that's what I was thinking, so it should be interesting to compare them side by side on the same dyno with the same setup.
As I'm not keeping the AC Cobra I couldn't justify the premium of the LS376/525 over the LS376/480. The later will also drive and behave better and still be plenty powerful enough for a 2200lbs kit car. And just a little bit more expensive compared to the standard LS3.
As I'm not keeping the AC Cobra I couldn't justify the premium of the LS376/525 over the LS376/480. The later will also drive and behave better and still be plenty powerful enough for a 2200lbs kit car. And just a little bit more expensive compared to the standard LS3.
