gronlit Posted March 2, 2009 Posted March 2, 2009 I always hear people say that GM published the HP ratings lower than actual for insurance reasons. The LS5 was published at 360HP, but there is a Chevrolet training manual on Ebay that lists it at 390hp...wonder if this was the actual HP? Ebay Link Quote
Sam (Bones) Posted March 2, 2009 Posted March 2, 2009 there were two different LS5 454 in 1970, the 360 and 390, the 390hp went into vettes and a few Impala's, the truth to it is that they are the exact same engine, GM couldn't let the vette have lower hp numbers, so they played with the hp numbers, some they rated the hp at different RPM's Quote
Guest 72yellowmc Posted March 3, 2009 Posted March 3, 2009 The 360hp and 390hp had different carbs. I believe the 360 had the q-jet .. and the 390 had a holley. Quote
Sam (Bones) Posted March 3, 2009 Posted March 3, 2009 no!!! the LS6 had a holley and the 396/402-375hp had a holley too, I had a factory 390 hp, Q-jet, same cam , same heads, the intake for a vette was real low for hood clearance, the carb maybe different, I'll have to research that Quote
Guest 72yellowmc Posted March 3, 2009 Posted March 3, 2009 no!!! the LS6 had a holley and the 396/402-375hp had a holley too, I had a factory 390 hp, Q-jet, same cam , same heads, the intake for a vette was real low for hood clearance, the carb maybe different, I'll have to research that what do you mean no!!!!! . . Quote
Sam (Bones) Posted March 3, 2009 Posted March 3, 2009 if you don't understand...there's no sense explaining it Quote
RichG Posted March 3, 2009 Posted March 3, 2009 I thought I heard that the difference was in the exhaust manifolds. And also cause the vette HAD to make more power! Quote
Guest 72yellowmc Posted March 3, 2009 Posted March 3, 2009 if you don't understand...there's no sense explaining it Who cares ... it's just a PIG block anyway .... .. Quote
gronlit Posted March 3, 2009 Author Posted March 3, 2009 Wow, look what i started. Hopefully we can agree that the lucky 454s to make it into the Montes looked better going down the road. Quote
Sam (Bones) Posted March 3, 2009 Posted March 3, 2009 Wow, look what i started. Hopefully we can agree that the lucky 454s to make it into the Montes looked better going down the road. not to worry...Robyn and I are just busting each others chops, we speak on the phone often, and know it's all in fun Quote
Guest 72yellowmc Posted March 4, 2009 Posted March 4, 2009 Originally Posted By: gronlit Wow, look what i started. Hopefully we can agree that the lucky 454s to make it into the Montes looked better going down the road. not to worry...Robyn and I are just busting each others chops, we speak on the phone often, and know it's all in fun .... .... Quote
Jared Richey Posted March 4, 2009 Posted March 4, 2009 Robyns always been known as a trouble maker. Back to the post... You're right that GM lied on HP ratings in the Muscle Car days for insurance purposes, what I've heard is the LS6 Chevelle had more like 500+ HP instead of 450. Quote
David Mau Posted March 4, 2009 Posted March 4, 2009 You're right that GM lied on HP ratings in the Muscle Car days for insurance purposes... And they were not alone in doing so! What an era it was... Sam is correct about the Corvette thing, too. The Corvette always had the top horsepower ratings with any of Chevy's engines. Dave Quote
Sam (Bones) Posted March 4, 2009 Posted March 4, 2009 they didn't necessarily lie....they rated horse power at a lower RPM, I also believe that's what lead to the change in how they rated horse power too Quote
David Mau Posted March 4, 2009 Posted March 4, 2009 they didn't necessarily lie... Well, no - it really was more like not advertising the "whole truth". Dave Quote
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