70 vs. 71
Thread Starter
Racer
Joined: Feb 2008
Posts: 447
Likes: 5
From: Double Oak TX
70 vs. 71
I know that hp ratings were calculated differently in the early 70's (gross vs net). So, is there a real difference in a 300 hp 1970 Vette and a 270 hp 1971? It seams like torque is also reduced from 70 to 71 (although calc'd. At a lower RPM).
Last edited by Cajun_LS3; Nov 12, 2014 at 11:34 PM.
Team Owner
Joined: Sep 2006
Posts: 31,273
Likes: 4,366
From: Westminster Maryland
Hi C,
I agree with early shark.
The 70 and 71 engines were rated by the same method
The change in hp rating method occurred for the 1972 cars thus the larger published hp difference was evident then.
Some 71 literature lists the GROSS and S.A.E. NET hp rating too. 210 hp.
This is a chart in the Nov.1970 Corvette News, in an article about the new 71.
Regards,
Alan
Notice this chart would have you believe there was a 115 hp difference between the L48 and the LS6…. I think it was probably a couple more hp than that.
I agree with early shark.
The 70 and 71 engines were rated by the same method
The change in hp rating method occurred for the 1972 cars thus the larger published hp difference was evident then.
Some 71 literature lists the GROSS and S.A.E. NET hp rating too. 210 hp.
This is a chart in the Nov.1970 Corvette News, in an article about the new 71.
Regards,
Alan
Notice this chart would have you believe there was a 115 hp difference between the L48 and the LS6…. I think it was probably a couple more hp than that.
Last edited by Alan 71; Nov 14, 2014 at 09:26 AM.
Melting Slicks
Joined: Feb 2004
Posts: 2,111
Likes: 32
From: Damascus MD
Hi C,
I agree with early shark.
The 70 and 71 engines were rated by the same method
The change in hp rating method occurred for the 1972 cars thus the larger published hp difference was evident then.
Some 71 literature lists the GROSS and S.A.E. NET hp rating too. 210 hp.
This is a chart in the Nov.1970 Corvette News, in an article about the new 71.
Regards,
Alan
Notice this chart would have you believe there was a 125hp difference between the L48 and the LS6…. I think it was probably a couple more hp than that.
I agree with early shark.
The 70 and 71 engines were rated by the same method
The change in hp rating method occurred for the 1972 cars thus the larger published hp difference was evident then.
Some 71 literature lists the GROSS and S.A.E. NET hp rating too. 210 hp.
This is a chart in the Nov.1970 Corvette News, in an article about the new 71.
Regards,
Alan
Notice this chart would have you believe there was a 125hp difference between the L48 and the LS6…. I think it was probably a couple more hp than that.
Alan,
That difference is pretty laughable. I got a good kick out of the chart.
Bill
Melting Slicks
Joined: Mar 2005
Posts: 2,094
Likes: 298
From: Midlothian VA
Thread Starter
Racer
Joined: Feb 2008
Posts: 447
Likes: 5
From: Double Oak TX
The real answer is "it depends".
Try this for some depth of information on the topic.
Try this for some depth of information on the topic.
