Stock, LS1, LS6 spring info

[Superdave]

why such low lift....stock 3400 is 436

we're trying to keep it streetable since it's a daily driver.. I kept the lift lower and upped the duration to get the air in.

the LS1 springs are allready installed on the heads, also didn't want to have the expence of changing them...

we're talking about a lift difference of .044 which is hardly anything... lol the longer duration really helps it though. Maybe LS6's are worth the added expence. I bet someone would buy the LS1's.

[gectek]

i think u have it backwards...the lift will get the air in, dur is more for time it is allowed in, and usually better for higher RPM than lower. the higher lift will help out everything and if you keep the same dur, it will increase all through the RPM, still be choked a little at the top, but help out alot with bottom end

[SappySE107]

I know LS6 have worked at .533 lift.

[Superdave]

i think u have it backwards...the lift will get the air in, dur is more for time it is allowed in, and usually better for higher RPM than lower. the higher lift will help out everything and if you keep the same dur, it will increase all through the RPM, still be choked a little at the top, but help out alot with bottom end

If you look at the flow numbers under .500 lift it's still flowing tons of air. Besides, the valve spends more time below peak lift than it does at peak. The longer you can keep it open the more air the piston will draw in.

I've got all the specs in DD2K and it's showing some pretty healthy numbers.

240 HP/246 TQ with stock compression, ported top end "HP Manifolds" --(meaning the 3500 Malibu's). I'm not sure how much the stock 3400 TB flows so i put in 300 CFM for now... .465 in/.470 ex with 270 advertised on both.

[gectek]

daily driver with a healty lope to it, im sorry i am looking lower dur and higher lift to keep the driveability and not worry too much about lope

[Superdave]

daily driver with a healty lope to it, im sorry i am looking lower dur and higher lift to keep the driveability and not worry too much about lope

I've kept the overlap around 50 degrees so it shouldn't lope too bad.. it'll deffenetly be noticible though.. lol

that was the goal, to have the cammed up sound, making decent overall power but still have a good power band and good vacuum for driveability.


If he decides to switch springs then we can go your route, something similar to the MMS stage 1 would work nicely.