I am new to the forum and looking for a little advice. I have a stock crate 426 Hemi 9.0:1cr that will be going in a 3000lb autocross and some street driving(no power brakes). I will be running a Stage V intake, jerico trans and a winters quickchange rear. I would like to have 4000 usable rpm.

Now for the question. My build is on a budget and putting a roller cam in is out of the budget. I was thinking the best way to get 4000 usable rpm (3-7k or 2.5-6.5k) would be to switch to a solid lifter cam? I really don't want to pull the heads but have no problem with changing valve springs with the head on. Is 7000rpm a realistic rpm limit or will I need to carry a mop with me? Or am I better off to stay with a hyd cam? What is the realist rpm limit with a hyd cam on a hemi?

Thanks

I doubt you'll see 7000 rpm with a hyd. cam, you'll need a solid lifter cam, even a hyd. roller wouldn't get that hi.

The big question I have is what is the vintage of that crate hemi ?

Welcome to the 'board. Sweet choice for user name, ha, ha!

It's a cummins a vintage. It was disassembled, check and reassembled or at least that's the story behind the motor. I agree with you, 7k and hyd don't go together. I am guessing that I will only drive the car 3-4k a year so pulling the valve covers once a year is no big deal.

Any idea what the max lift you can run on a set of stock heads, stock guides and valve stem seals aka I don't want to have to pull the heads unless I have to.

Honestly I don't like your idea. I've run lots of 426's with stock heads and even with the weak stock cam they like to wake up about 4000 and will pull to 7000. You're only at 426 inches with pretty large ports. You could go with a small solid and try to run between 4000 and 7000 but it's not really a hot setup at all especially with 9-1 compression.
I run a 472 in one of my cars with stock window Stage V heads and a tiny solid camshaft. It works pretty nice between 3000 and 6500.
The engine is heavy too, I just don't see this thing doing what you want.

Sheldon

I have a .600/.600 solid roller in my cross rammed hemi in the demon. Mostly street drive it. I don't see how you will be able to run a roller with such low compression. Mine is advertised as a mild street roller and is 11 to 1 compression.

I may not have been clear, I do not want to run a roller. It's out of my budget and like you said way to much for my motor. I just don't see being able to run a hyd cam over 6k so I was looking for suggestions on a solid flat tappet cam.

The solid in my road runner is a comp cams .519/.519 lift and is advertised as a torque monster. Car has great manners and is 10.25 to 1 compression. Has an Indy single four intake and a 1070 cdm biggs single four on it.

I am running a 9.5-1 compression with a crane solid roller in my 572 hemi. If you use a wide lobe separation, like 112*+ it can and does work. Mine is 242@50 and a .628" lift, I am running pushrod oiling too, saves pushrod cups. Tim

There are hydraulic cams that will turn 7000 with no problem but you don't need to push the Hemi that high. I would cam it for 6500 as the Hemi has so much low end torque. Solid lifter cams seem to have a short life because of the lack of zink in the oil. You might to penny wise and pound foolish . My question is how are you going to turn a fairly light car with that much engine weight on the front on an autocross track?

What cam/lifter combo are you thinking? After putting in the custom front suspension and removing the front bumper it will be less then 100lb heavier than the inline 6. I will have to add a little weight to the rear to make weight and it will have 295 or wider rubber on all four corners.

If I can get away with a hyd cam and be able to run close to 7k that would be awesome.

I don't see a hemi lasting long on and off the throttle to 7000rpm's. Call me stupid but they have a lot of rotating mass.

What do you think is a realistic number? 6000,6500? I would rather put a smaller pill in it than have to carry a mop around in the trunk.

The stock 426 street Hemi motors with the original valve springs, 125 lbs on the seats and 325 lbs open at .484 and .460 on the exhaust valve lift would run hard to 7000 RPM, not to 7100 or 7200 RPM The stock 1970/71 street Hemi motors with all stock parts would rev to 7000 RPM also with the OEM low tapered hydrauli lifters On your deal the oil pan and oil pressure will be the largest risk of hurting the motor in the corners and on deacceration On the valve train look at good valve springs and better stiffer pushrods and check the valve lift on all the rocker arms. I use to race one in NHRA stock and I have seen as much as .130 lift differences at the valves on stock rockers There are lots of mild cams that will pull hard to 7000 RPM, call Crane, Comp, Lunati and Isky to see what they suggest, most of the 1-800 cam help techs are not Mopar 426 Hemi specialist so be careful on acceptng the first cam grind suggestion Good luck, let us know what you do

Rather than talk to the cam grinders, who might not do a Mopar (let alone a Hemi) vary often, why not call a dedicated Hemi builder? Rich Nedbal is affiliated with Comp Cams, he spec'd the cam in my blower motor. And then there is Ray Barton, Indy Cyl, and Tim at FHO. Any of them could dial you in a cam that they have a lot of experience with and know will deliver the goods.

two cents

Don't forget Chase Knight from Crane Cams, he spec'd mine. Tim

Looks like I have some calls to make in the next day or two. I will let you know what I find out. Thanks

I have a Cummins built Hemi , Feb of 2005 assembly , NOTHING was right with it. For your sake I hope it's all correct

i run what i think is a great hydraulic cam, has worked well for me. mine is a 472 with decent flowing mopar aluminum heads, compression probably in the 10.0:1 range, not sure exactly what it is.

i will post the specs on it later tonight when i get home.

426 Hemi,Jericho, winters quick change, stage V intake and you're on a budget!? I guess so after buying all that low dollar stuff.