Differences between '70 Chevelle LS6 and the '71 Corvette LS6?
09-04-2006, 10:39 AM
#22
Drifting
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2018 C2 of Year Winner
Originally Posted by Steve439
GM also sells the ZZ454 which comes with pretty good aluminum heads.
http://www.sdpc2000.com/catalog/120/...inum-Heads.htm
http://www.sdpc2000.com/catalog/120/...inum-Heads.htm
The zz454 is a really nice streetable big block.
I just put on in to give my LS-5 a rest.
Runs great and has a TON of torque.Check Dobles GM performance parts for a great price. I found them to be the cheapest, and at the time they shipped it FREE!!!!!
09-04-2006, 10:50 AM
#23
Race Director
Originally Posted by Steve439
It's a better cam for a low compression motor. Supposedly the LS6 cars are kind of doggy.
WHAT???? An LS6 is doggy!!!! Whatever you are comparing it too I want one unless I have to run nitromethane in it.
09-04-2006, 11:08 AM
#24
Le Mans Master
Originally Posted by 63mako
WHAT???? An LS6 is doggy!!!! Whatever you are comparing it too I want one unless I have to run nitromethane in it.
09-04-2006, 11:24 AM
#26
Race Director
Originally Posted by 73-84 IMSA Widebody
While your on the GM crate site,the ZZ572/720hp sure catches my eye, wish I had something to put it in
Now your talking.
09-04-2006, 02:51 PM
#27
Melting Slicks
My good buddy Chris had a 70 chevelle LS6 back in the day. It was truely on of the fastest cars I have been in. Power everywhere. Maybe the wayback factor makes it seem faster but thats how I remeber it.
Last edited by panchop; 09-04-2006 at 07:25 PM.
09-04-2006, 02:57 PM
#28
Le Mans Master
Originally Posted by panchop
Maybe the wayback factor makes it seem faster but thats how I remeber it.
Guys had to buy COPO/dealer built cars until then just to get the L72.
The shame is that the LS6 (or LS7) wasn't offered in the 70 Vette.
09-04-2006, 08:05 PM
#29
I own a 71 ls6 coupe, the limiting factor is the low compression and the 569 intake. You can add a 1 inch spacer to help, but very few after market intakes will fit. Dont forget that it also came with transistor ignition. I put in a comp cams extreme energy solid with 232/236 vduration @.050 and 553/568 lift with a 110 centerline. I have 16 inches of vacum @ 950 rpm, great cam, original is out dated. Car has run 12.65 @110 MPH. i WOULD ADD SOME COMPRESSION.the heads are very expensive to buy, and aftermarket have better flow than the originals, except they dont have that winters foundry mark on them!!!
09-09-2006, 02:06 PM
#30
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Sounds like it would make the most sense to build it myself
Originally Posted by morganjd
I own a 71 ls6 coupe, the limiting factor is the low compression and the 569 intake. You can add a 1 inch spacer to help, but very few after market intakes will fit. Dont forget that it also came with transistor ignition. I put in a comp cams extreme energy solid with 232/236 vduration @.050 and 553/568 lift with a 110 centerline. I have 16 inches of vacum @ 950 rpm, great cam, original is out dated. Car has run 12.65 @110 MPH. i WOULD ADD SOME COMPRESSION.the heads are very expensive to buy, and aftermarket have better flow than the originals, except they dont have that winters foundry mark on them!!!
From what I have been reading, the oval port heads are better for a street/torque motor, such as the 781 or the 049 heads. I would aim for a compression ratio of 10:1, using one of the above cam recommendations.
I would stick with the big block Corvette exhaust manifolds with a mandrel bent exhaust system.
RDave
Last edited by RDave; 09-10-2006 at 05:26 AM.
09-10-2006, 08:44 AM
#31
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Originally Posted by Steve439
I don't think so - it's pretty much an L72 with 27 extra inches.
Guys had to buy COPO/dealer built cars until then just to get the L72.
The shame is that the LS6 (or LS7) wasn't offered in the 70 Vette.
Guys had to buy COPO/dealer built cars until then just to get the L72.
The shame is that the LS6 (or LS7) wasn't offered in the 70 Vette.
with 4.10s a 4sp & M & H slicks on the street it was a brute Although a little hard on the hard to get avi fuel
09-10-2006, 09:41 AM
#32
Originally Posted by mjf6175
Let me add some info. The LS-6 Corvette was rated 425hp (GROSS) and was rated 325hp (NET) by GM. As some of you here may know, 1971 is a good year to use as a reference point between the GROSS/NET hp figures since GM rated their engines BOTH ways. I believe this was the only year that they did this. The LS-6 Chevelle (1970) was rated the 450 Gross, no net stated by GM. The drop in hp from70 to 71 was mainly due to compression, from 11.0 to 9.0 Of course there were other minor differences ( carb specs). And as others mentioned the 71 LS-6 had the aluminum heads. I have a friend who owns an original LS-6 Vette (and is the original owner) convertible-great car, dark green and beautiful.
It is also possible however that the '70 enginse were underrated for insurance purposes.
09-10-2006, 08:48 PM
#33
Race Director
Originally Posted by StickShiftCorvette
It is also possible however that the '70 enginse were underrated for insurance purposes.
