[Rewind]

I was having issues with my motor (posted in engine section ) decided i couldn't really adjust valves like i needed , so i pulled cam to see if it was a solid cam or hyd. it did have hyd lifter but some i can't get to move down and others are very easy to push down .

Well i was hoping when i pulled the cam i could find some numbers that would help id the cam but i couldn't find nothing that matchs the few numbers on it .
At this point i need to put a cam and lifters back in it as i need the car movable to have some work done to it . I plan on going thru motor later but not at this time . I am going to have the heads checked out thou and get the info on the springs as they are double springs but thats all i know .

The motor is a 454 , 11.1 to 11.25 pistons (2349 030 ) with 3964291 heads . I want to put a new cam and lifters set in , But i don't want have to remove motor from car . So 11 to 1 compression , 4.11 gear , 750 holley , 3400 lbs , 3800 convertor , comp comps roller tips 1.72 rockers .
What can i saftly run for a camshaft without having to worry if a valve will hit the piston ? Should i just go with a replacement ls6 solid type cam ?

 

[Guest]

Imho, a good old standard aftermarket cam for a decent 454 11 to 1 CR. engine is the CC 292 Magnum..

NOTHING fancy here at all...

Just for starters....

pdq67

Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

 

[Johnny O]

If you dont go crazy with duration and lift, you should have no problem with most any of the common cams for this combo....something in the 240 @.050 range, maybe .575/.595 lift? There are a ton of ways you can go. I can tell you this, those pistons are not very forgiving with p/v clearance, I know from experience. The TRW's dont have much of a relief. I ran that same exact combo several years ago, and ran into trouble with a duration of 256 @ .050 and lift of .620 on a solid roller. Keep in mind also that those heads have huge intake runners (325cc), so they are better suited for high rpm use. If you couple the heads up with a big cam, you will have a bit of a slug at lower rpms. I hope you kept track of where those lifters came out of so you can put them all back in the same bores.

 

[Rewind]

Thanks guys , i was thinking 250 ish duration @ 050 inch max to be safe . The 292 Magnum does seem like it would be a good choice , any other suggestions if someone runs close to the same setup ?

 

[Rewind]

Forgot , Johnny O i did keep track of them and the order but i can push some of the lifters down easy and some i can hardly get to move , Think iam gonna do cam and lifters to be safe .

 

[Johnny O]

Good move, a set of lifters isnt really that much, considering the peace of mind it will give you.

 

[Augustboy2009]

A couple guys on this site and myself are running to XE294 it's, 250/256 duration @50 with 588intake and 593exhaust lift. Lots of power.

 

[Rewind]

i looked at the comp cams website last night and was reading here on the forum about that cam , I thought i would for sure need to check piston /valve clearences with that cam . I've not got the tools to to do that however and really don't want to pull the engine to take it and have it checked as i have to have the car movable .
Just waiting for the heads to be checked out and the spring pressure checked to see if i can run the 292 Magnum cam with them or perhaps the one you mentioned .

 

[Augustboy2009]

Yeah the XE294 is pretty aggressive so you would probably run into clearance issues with those pistons.

 

[Rewind]

I remember reading on the forum about udharolds old cam list it showed a solid cam that was for a ls6 that gave more more all over . Anyone recall that cam and where i find the info on it ? I don't mind a solid cam just don't want to go to roller cams as of now .

It looks like the The 292 Magnum is where iam right now , or a replacement ls6 454 solid cam if i can find one . Just need to get this back together.

Thanks

 

[Burnsamatic]

I have the XE294 cam in my 468 and it's awesome! Well, it was awesome until the bottom end came apart.

 

[wildman926]

Here you go. This is one of Harold's designs:
Lunati 402A7Lun
New Drag Race Chevrolet Big Block (1967 – Present) Solid; Rough idle. Good cam for bracket racing in 396–454 cubic inch motors. Needs 3500 RPM stall converter, headers, 10.5:1 compression ratio and 4.10 gearing
Advertised Duration IN/EX: 288/296
Duration @.050 IN/EX: 255/263
Gross Valve Lift IN/EX: .612"/.630"
Lobe Sep Angle / Intake Ctr Line: 110/104
Valve Lash IN/EX: .024"/.026"
RPM Range: 3000-7000

This would give you a net lift of .588/.605 after lash.

 

[wildman926]

I have one with EDM hole lifters if interested. I just PM'd you.

 

[Rewind]

I have the XE294 cam in my 468 and it's awesome! Well, it was awesome until the bottom end came apart.

That cam would be very ideal overall , however the motor is in the car now and i would be unable to get the pistons cut if there was no clearence . Just money wise i can't take it back out , have it re balanced ect. That why i was thinking a ls6 replacement cam since i have the 3964291 heads and the 2349 pistons , which i was told don't give alot valve clearence.

 

[wildman926]

Wow, I over looked that aspect of it. With those pistons, you are pretty much stuck with an older design, with very little lift.

 

[Burnsamatic]

I was running Merlin Cast iron oval port heads with 119cc combustion chambers. No clearance issues.

 

[Rewind]

ok found the specs in another post .. DURATION AT SEAT IN/EX LOBE SEPARATION GROSS VALVE LIFT IN/EX DURATION AT .050" IN/EX TYPICAL APPLICATIONS POWER RANGE
*272/272 110 .550/.550 238/238 Excellent replacement for LS6 cam, more power everywhere. 2200-6500

Now to find the cam lol

 

[wildman926]

I don't think that cam has enough duration for your compression. You may have to get one custom ground. ???

 

[Johnny O]

I don't think that cam has enough duration for your compression. You may have to get one custom ground. ???

Didnt the LS6 have c/r around 11/1 or close to that?

 

[Rewind]

i got a few iam gonna call tech lines monday .. heres the choices so far : Pending if they should clear without cutting the 2349 pistons

Comp Magnum 292H
Operating Range: 2500-6500 RPM
Duration Advertised: 292° Intake / 292° Exhaust
Duration @ .050'' Lift: 244° Intake / 244° Exhaust
Valve Lift w/1.7 Rockers: .550'' Intake / .550'' Exhaust
Lobe Separation Angle: 110°

Lunati 402A2LUN
Advertised Duration IN/EX: 272/282
Duration @.050 IN/EX: 238/248
Gross Valve Lift IN/EX: .550"/.570"
Lobe Sep Angle / Intake Ctr Line: 112/106
Valve Lash IN/EX: .020"/.022"
RPM Range: 2400-6800


Lunati 20202
Advertised Duration IN/EX: 310/310
Duration @.050 IN/EX: 242/242
Gross Valve Lift IN/EX: .530"/.530"
Lobe Sep Angle / Intake Ctr Line: 114/108
Valve Lash IN/EX: .024"/.026"
RPM Range: 3000-6500