[NickyRacerBoy]

I mostly roadrace my 1le so what about something tight like 112?
These DI engines don't seen to run as tight of a LSA as Gen 4. Any ideas why that would be? ��

I personally know that Katech Torquer 110 in LS7 makes for an awesome track setup but idle needs to be 1000at a min.

Looking to start informative and educational conversations

[danhr]

Curious on this as well.... seems like most of the cams out there are on a relatively wide lsa.

[DFW1LE]

This should give you some insight:
http://www.compcams.com/Pages/413/ca...ion-angle.aspx

[oldman]

Originally Posted by NickyRacerBoy

I mostly roadrace my 1le so what about something tight like 112?
These DI engines don't seen to run as tight of a LSA as Gen 4. Any ideas why that would be? ��

I personally know that Katech Torquer 110 in LS7 makes for an awesome track setup but idle needs to be 1000at a min.

Looking to start informative and educational conversations

Before I went blower, I was looking at a 416 stroker ( I do autoX and very minor road race). I was looking at something like a 112 LSA. I also have a M6 and 1st gear is kind of long so I wanted the tight LSA to build more torque.

It maybe with the stock heads / bore / stroke it is hard to CR above 12.5 and with a tight LSA, dynamic compression will fall off. No problem with a stroker….. second thought why tight LSA are not done, you can get duration and still have a streetable idle with a 116 up LSA, the duration is what is going to add to top end power. (It also sells cams).

From my perspective (I'm old), todays 3/4 street cars have much more idle and things like A/C vs 3/4 cars in the 70, 80 , 90s. They are also faster, dont' get me wrong. I'm just saying that my 440 Dart had no A/C no p/s, no heater core, no sound deadening, no power brakes, and not much of an idle. That was a high torque streetable BB that I drove daily. The SB guys heck they were 230+ duration cams with 110 centers, 4.88 gears, it would be water boarding to DD that.... The SB needed the tight center to build some torque heck going way back through my memory, my buds TBucket had 106 LSA on his Ford 302

[DFW1LE]

Some cams also have advance ground into them, and that can provide improved low end torque (eg 113 +5*). Overlap will determine idle quality and how clean or dirty a cam may be emissions wise. Much easier to get good idle/driveability with a lower overlap cam, and depending on duration can be easier to achieve with a wider lsa.

[ninetres]

Just received a new custom turbo cam for my race car. 118+5 LSA. It’s not DI but I’m excited to see how it sounds woth such a wide LSA.

[KingLT1]

Originally Posted by NickyRacerBoy

I mostly roadrace my 1le so what about something tight like 112?
These DI engines don't seen to run as tight of a LSA as Gen 4. Any ideas why that would be? ��

I personally know that Katech Torquer 110 in LS7 makes for an awesome track setup but idle needs to be 1000at a min.

Looking to start informative and educational conversations

I believe VVT is part of the reason...when you lock it out, the cam selection starts to look similar to ls3 stuff.

[NickyRacerBoy]

Loving ALL responses.. Keep m coming

[oldman]

189 / 223 on 120 LSA is th3 lt4 spec, it seems to me the supercharged lt1 is producing a lot more power per boost, so I don’t know why gm has even wider LSA for the lt4. Is the zR1 cam the same? Yes I know the lt1 has higher cr.

Basically lingenfelter’s smooth idle blower cam is the only perf cam I know of tp keep a wide LSA of 121 217 / 245. It seems to be the only traditional FI spec perf cam on the market.

[oldman]

200 / 207 on 116.5 LSA is the LT1 stock spec

[NickyRacerBoy]

Originally Posted by DFW1LE

This should give you some insight:
http://www.compcams.com/Pages/413/ca...ion-angle.aspx

Thanks.. Excellent for quick reference.

[RUQWIKR]

Regardless of cam, especially for road racing, valvetrain stability is critical for engine longevity. Katech has checked via their Spintron the one they used in the 600hp packages but okay it for road racing. It's a wide wide LSA tested with stock valves but different springs and Ti retainers. If I go heads and cam, I'm probably going with custom Ti intake and exhaust valves with bronze valve guides.

Katech's: 219 / 233 @ .050, . 643/ .655 lift, 118 LSA

An oldie but a goodie article from Katech on valvetrain stability with LS7's. Worth a read.

http://www.superchevy.com/how-to/140...xhaust-valves/

[KingLT1]

Originally Posted by RUQWIKR

Regardless of cam, especially for road racing, valvetrain stability is critical for engine longevity. Katech has checked via their Spintron the one they used in the 600hp packages but okay it for road racing. It's a wide wide LSA tested with stock valves but different springs and Ti retainers. If I go heads and cam, I'm probably going with custom Ti intake and exhaust valves with bronze valve guides.

Katech's: 219 / 233 @ .050, . 643/ .655 lift, 118 LSA

An oldie but a goodie article from Katech on valvetrain stability with LS7's. Worth a read.

http://www.superchevy.com/how-to/140...xhaust-valves/

Do you plan on going with a different rocker then stock?

[oldman]

Originally Posted by RUQWIKR

Regardless of cam, especially for road racing, valvetrain stability is critical for engine longevity. Katech has checked via their Spintron the one they used in the 600hp packages but okay it for road racing. It's a wide wide LSA tested with stock valves but different springs and Ti retainers. If I go heads and cam, I'm probably going with custom Ti intake and exhaust valves with bronze valve guides.

Katech's: 219 / 233 @ .050, . 643/ .655 lift, 118 LSA

An oldie but a goodie article from Katech on valvetrain stability with LS7's. Worth a read.

http://www.superchevy.com/how-to/140...xhaust-valves/

I would also think of TI intake valves, since it is so much heavier. You make a good point about valve train stability.. I was very interested in the conical valve springs, I ended up with TxSpeed dual valve springs, but if I had more time, I would have liked to shimmed up the new comp cams conical springs and see how they last.

I will admit right now I'm afraid of longterm use of my .63X lift cam, I went through all the LS1 stuff breaking and I'm just gun shy. I keep telling myself next year with the forged engine, go with new lifters, new springs, new pushrods, new rockers... Call me paranoid.


https://www.hotrod.com/articles/comp...gy-marches-on/

http://www.superchevy.com/how-to/eng...ind-the-coils/