I wonder what the LS7 would have been like...

"JayZAyEighty thinks C4+3=C7" (jayzayeighty) 09/28/2014 at 22:01 • Filed to: None

1

8

if they had followed the 3 valve plan originally intended to help set it apart. It's hard to imagine the LS7 being much better by going that route.

Sweet Trav > JayZAyEighty thinks C4+3=C7 09/28/2014 at 22:03

2

Were the 3v ford mod motors that much better than the 2v?

I don't think it would have made that much more power and the weight of the valvetrain wouldn't have let it rev to 7k.

JayZAyEighty thinks C4+3=C7 > Sweet Trav 09/28/2014 at 22:08

0

That's true. I really don't think it would have been much better, although I would be curious to see the difference. It's only a shame they didn't produce the LS7 454 they wanted to in 1970.

By the way, I haven't had any more MAF issues. Sorry for the false alarm.

DoYouEvenShift > JayZAyEighty thinks C4+3=C7 09/28/2014 at 22:11

3

Im reeeaaally glad they didnt go this route. Im sure theres a reason they decided against it. Looking at the pics of the prototypes, its easy to see why. Look at all that mass! And that cross pushrod is a disaster waiting to happen.

One of the advantages of LS engines is the simplicity and compact design. That head there is as big and busy as a dohc head. So you have the disadvantages of both ohc and pushrod motors, and no advantages of either.

Sweet Trav > JayZAyEighty thinks C4+3=C7 09/28/2014 at 22:15

0

I want to know why we haven't seen any canted valve V8 products from GM since the last big blocks.

DoYouEvenShift > Sweet Trav 09/28/2014 at 22:23

0

New LT1 is canted valve actually

mcseanerson > JayZAyEighty thinks C4+3=C7 09/28/2014 at 22:24

0

IIRC the issue was that it was easier to flow more air with two really big extra light valves than it would have been with the three valves.

DoYouEvenShift > Sweet Trav 09/28/2014 at 22:26

0

Not by much, but still. 12.5/12 degrees intake and exhaust respectively.

briannutter1 > Sweet Trav 09/29/2014 at 10:54

0

New LT1 is slight splayed valve. There's a really good SAE article on the new engines and the number of combustion chamber computations they did to lower emissions. 4 major phases that started with a LS7 with DI to a 3rd design that was really hi tech, but would have moved the rocker cover rail outwards, to the final iteration with a S shaped exhaust port to keep the packaging.