I was watching Barret Jackson last night and saw a 1970 chevell with rare LS6 ENG with 455 HP was sold for 103K$ ,I wonder if that fit in our buick since they said it was a 455,but did not sat if it was buick,olds,or pontiac eng,anybody knows about 70,s LS6 455 eng,or can modify my 455 to those spec.s and changes need to done?
That is a Chevy 454 rated at 450 hp.. Two things must be considerd. The cid published is just a number that sometmes is arbitrary and sometimes rounded off. As I recall a 454 Chevy is less than the 454 assigned if you do the bore an stroke calculations whereas a 455 Buick is closer to 456 than 455. Both are completely different engines than do not share any fundamental parts and they do not have the same bore and stroke. As I recall maybe it was the 427 Ford that was assigned 427 to make it greater than the 426 Mopar even though it is less than 426--something like 425 cid?-- in fact. As for the hp ratings they are also somewhat arbitrary as we discussed here. http://www.v8buick.com/showthread.php?t=91778&highlight=arbitrary Finally there is the practice of rating engines at different rpms so as to affect the results for say for insurance purposes. Having said all this the LS6 454 Chevy was a great engine.
It'll be awwwright Will it fit? Allow me to address that one. I got a 72 Stage 1 one time that had a 454 Chebbie (hurts to even type! ou: ) anyhow it had one of those in it. In order to pull off this feat of supreme wisdom they WELDED the Chevy motor mounts to the engine cradle and then bashed in the firewall in with a sledge hammer, no less, to make room for the rear mount distributor!!!!!!! :af: :rant: :blast: :ball:
I use the LS6 as an anchor chained to the wagon when no one is around . It works OK until the wagon hears a big block passing the house and gets restless.
Those factory HP ratings were bogus back in 1970. NHRA factored the 70 Stage 1 to 420 hp. And....factored the LS6 down from 450.
But, that's not through the factory cast iron exhaust manifolds....right??? Still trying to figure out how the 454 got a 450 HP rating. Was that with the factory exhaust manifolds??? I believe the 1970 455 Stage-1 pump out an actual 376 HP on the dyno. Why the big difference between the Stage-1 and the LS-6? That's a 74 HP difference. You can't do that with a simple camshaft change.
One of my old HR mags has a story on the LS6 and showed that Chevy DID get the 450 figure on a dyno using aluminum intake, Holley double pumper, and tube headers. Buick, on the other hand was acutally underrating the Stage 1 in their factory literature. The Rivi and Electra 455 were rated at 370, the GS455 at 350, and the Stage 1 at 360, though the GS455 had the same motor as the big cars, with standard heads, carb, cam, and spark. I guess it was to keep the insurance beancounters happy. It gets humourous when a newbie believes the literature, and tries to tell me that his Rivi or Electra motor is better than a Stage 1 at making power. Dan
In actuality, both the 430 and 455 were well within the 400 HP range. My newly acquired 67 Wildcat with the 430-4 is rated at 360 HP but was dinoed by the previous owner at 420 HP. Actually a renown Chevelle expert claims that the actual stock HP rating for the LS-6 is closer to 500+HP. As for the 70 Stage 1, the 360HP figure is a joke. It is at least a 420HP car.
The 376 HP for the 1970 455 Stage-1 figure comes from Dennis Manner... If anyone would know, it would be him.
Tube Headers... Now, that explains why there is such a difference in HP ratings between to two engines...
The LS-6 and the Stage 1 are 2 totally different animals. The LS-6 used 11.25:1 forged pistons, had larger ports and valves, aluminum intake, Holley carb., solid lifters, big cam, etc. Actually the Stage 1 was much more comparable spec. wise to the LS-5 (360 hp/ 500 lbs. torque) version, but for various reasons the Stage 1 made more power. I think the LS-5 hp and torque ratings were optimistic as they are really a slouch, but the LS-6 was another story.
I had an LS5 in a 71 Corvette 4spd Convertible. When I bought it it was a terrible dog with over 100K miles and burning oil like a seive. But after getting it rebuilt to LS6 specs all I can say is that it was a screamer. Scarey fast in that car. As much as I like the buicks, I suggest that you don't take on an LS6 in good condition unless you want a real close race that could go either way. One thing I miss about the Corvettes... When I'm in my GS, it's a great fast sedan. On the other hand, when you're rowing the gears in a Corvette Stingray it's like being in a rocket ship. And if I still had my 71 Corvette I bet I could show a few of you my tail lights.
Just like the Stage One is capable of embarassing the "Big an Bad" 426 Street Hemi. :grin: p :3gears:
Well the 450 hp cheby rating is gross so it's closer to 400 hp net. A neer stock 455 with iron exhaust manifolds can make 400 hp easy!
Yeah, the Stage 1 can make 400 hp.......if you rate it at the gross rating too, not net. And it better be tuned right........or is that tweaked right o No: The 376 hp Dennis Manner talked about was gross rating. Have you ever had the pleasure of driving a properly tuned LS6? I have and it was a major rush! We all love our Buicks, but don't be nieve.
