Cam Questions

[Hotrodpaul]

Has anyone run the 2nd design off road chevy solid small block cam? I have an original LT-1 short block and was thinking about using this cam with some mildly worked over 340292 heads for a nice day 2 driver 1969 Z-28. I plan to call it "Project X" Anyway, just looking for some input on driveability, power, vacuum for the brake booster, etc.

I spent yesterday degreeing some popular cams in the LT-1, and here are the results:
note: the solids are adjusted for lash as it reduces the duration and lift specs.

1970 LT-1 Solid: Int Dur @ .006", .050" = 282, 229 deg, Exh Dur @ .006", .050" = 289, 235 deg
LCA = 114 deg, Int/Exh Lift @ 1.5 ratio = .433"/.450"

GM #3965754 2nd design Solid: Int Dur @ .006", .050" = 300, 248 deg, Exh Dur @ .006", .050" = 313, 259 deg
LCA = 112 deg, Int/Exh Lift @ 1.5 ratio = .488"/.505"

1969 Z-28 Solid: Int Dur @ .006", .050" = 304, 239 deg, Exh Dur @ .006", .050" = 304, 239 deg
LCA = 114 deg, Int/Exh Lift @ 1.5 ratio = .459"/.459" (Comp Cam Replacement)

1966 L-79 Hyd: Int Dur @ .006", .050" = 286, 222 deg, Exh Dur @ .006", .050" = 282, 222 deg
LCA = 114 deg, Int/Exh Lift @ 1.5 ratio = .447"/.447" (GM NOS Cam)

Comp 12-223-4 Solid: Int Dur @ .006", .050" = 270, 222 deg, Exh Dur @ .006", .050" = 269, 221 deg
LCA = 110 deg, Int/Exh Lift @ 1.5 ratio = .471"/.471"

For a good all around street cam, the Comp 12-223-4 would be nice, but I want something a little more nasty, that's why I was considering the 2nd design cam.




Paul

[scuncio]

Would you consider the 140 cam?

[Hotrodpaul]

Yes, I would consider the 140 cam, I just do not have one on hand. I believe some members here have run that cam with the 302 and had good results. Maybe they could chime in.

[napa68]

What is the compression on your short block?

Tim

[Hotrodpaul]

It would be the stock LT-1 10.5 to 11:1 with the 292 Turbo heads.

Paul

[Billohio]

I have the 140 in my 302 and doesn't have much vacuum and been fighting that.4000 and up its a screamer

[KenMaisano]

I have ran the Comp Cams Nostalgia plus 12-673-4 N+30-30S version of the 3965754 2nd design. This was in a 10to1 383 Four speed 373 gears. I used this camshaft to bleed off some cylinder pressure. the car had a Comp 272 224 110 cam and was Very octane sensitive. It did the job well. no more knocking, Lost a ton of low end torque but pulled good on the top end. It sounds bad ass! If your looking for something close to the sound of the 2nd design, but pulls better thought the whole powerband. I would suggest Comp Cams 12-221-5 280B-8 242-250-108 .507 .530 I have used this cam lashed at .024, installed at 104. makes strong torque and power.

P.S. I think I may still have this camshaft at my shop with a pair of matched lifters. If your interested, I can check Monday and its yours for free

Ken Maisano

[napa68]

I'm a huge fan of the LT1 cam. While it wont have the thundering idle it sounds like you care looking for, it pulls hard all through the RPM range and will run your power brakes.

Ken has a good point about bleeding off some cylinder pressure for pump gas. It just comes at the expense of low end torque.

11:1 and the LT1 cam.............you will be mixing in some race gas in order to keep the timing where it should be.

Tim

[scuncio]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KenMaisano</div><div class="ubbcode-body">I have ran the Comp Cams Nostalgia plus 12-673-4 N+30-30S version of the 3965754 2nd design. This was in a 10to1 383 Four speed 373 gears. I used this camshaft to bleed off some cylinder pressure. the car had a Comp 272 224 110 cam and was Very octane sensitive. It did the job well. no more knocking, Lost a ton of low end torque but pulled good on the top end. It sounds bad ass! If your looking for something close to the sound of the 2nd design, but pulls better thought the whole powerband. I would suggest Comp Cams 12-221-5 280B-8 242-250-108 .507 .530 I have used this cam lashed at .024, installed at 104. makes strong torque and power.

P.S. I think I may still have this camshaft at my shop with a pair of matched lifters. If your interested, I can check Monday and its yours for free

Ken Maisano
</div></div>

What a great offer!!

[Salvatore]

Go with the Comp set up.