Unreal

Does it matter if it is Brian or not? If the cam specs come back crap, or I'm not happy with the service/etc, I'll let everyone know.

Innovate

A little insight on speccing your own cam, you will end up picking out a spec out of a catalog. You cannot go picking random specs where the valve events do not work together. I kind of specced mine, I put some specs together and found a cam close after talking to Tick Performance. From what I gathered, everyone picks out of a catalog. Granted the guys speccing the cam will know your setup and what valve events need to happen and pick the cam that they think works best. This is all information I found when I wanted to spec my cam myself.

BTR is a great business, I am sure they will lead you in the right path!

Josh B.

The tech I spoke to at Comp Cams and I referenced the Master Lobe Catalog when deciding which lobes would be best on my 454.

I enjoyed reading through the catalog to see what's available, what are people referring to when they talk about some lobes "being more intense" or in a "different family". Really demystified the custom cam process.

http://www.compcams.com/Technical/Ca...terCatalog.pdf

Innovate

Sweet, that was what I was talking about! I have not looked into it and I skimmed through it, Comp really know how to do it. It would make more sense to me if I had someone walk me through it like you talked to a Comp Tech. I definitely will go this route if I ever switch up cams.

lamboworld

Yes, I am aware and I have familiarized myself with their catalog and what works and doesn't work.

BTR uses LXL lobes on the Intake and XE RPM HL on the Exhaust.
On most Mamo LS7 setups I have seen on this site, he uses either LXL or LSL lobes. The cam that he spec'd for me is LXL/LXL.

Once you know the lobes that everyone is using, you can back into the valve events and just use what has worked for everyone else.

I think that I plan to use an LSL/LXL lobe setup on my cam. The issue that I had was finding a cam that had the duration that I wanted. You can essentially make the cam events what you want by playing around with the duration and adjusting the LSA and advance. My goal was to get a cam that has an overlap between 19 and 21 that has cam events that are similar to what BTR and Mamo uses.

I think that I am going to land on this one: 239/256 "661/.652" LSA 114+3

lt1z

Not everyone uses Comp catalog lobes...

lamboworld

Unreal

Working with another cam person as I wait for BTR. 234/252 116+6. So far that is a winner in my book as far as cam timing/events, and doing what I want. Lobes need to be determined and lift will fall whereever it is. May see what cam motion has in that range.

Michael_D

What a minute....you are going with a different block now? I thought yours was OK and you were re-using it? I must have missed a few posts....

Unreal

It was ok. In fact new owner already put it back together I think. Just had a ring hit the wall and make a little ding. A .005" bore cleaned it right up. I decided to go aluminum instead of reuse the steel block. Doing LSR block. Reusing my crank and rods, new custom 10:1 pistons (thought of going more, but decided not), Mast 285 heads, DLC coated victory Ti valves, crower rockers, johnson lifters, etc.

Just trying to pick out the cam now. Talking with Bret B, who is awesome, he didn't like the comp recommendation saying the exhaust is opening too late. We will see what BTR says, but I like what he suggested.

Josh B.

Yes. Thank you for pointing that out. Many shops do but like you said not everyone. It's good info for people to check out.

MOTOWN Z

Very interested on hearing a real world opinion on this LSR block I wouldn't mind building one for the 70 Chevelle then add a Whipple.

Michael_D

You're going to have to re-learn how to drive that thing with the lighter front end...lol.... He must want more blow down? I had a conversation with Jud M at SAM a long time ago about valve events. He was pretty adamant about gett the EVO at the optimal time. Getting the right cam guru is soooooo important. Didn't take me long to figure out I am not one of them. And when you find one, treat him well.....

Innovate

Awesome, you did more research than I did while trying to spec my own. Of course I learned everything after the car was put together lol. That will be a good cam from the looks of it.

Unreal

Plenty of them out there. CPR has 4-5 out in the field making 1200-1500rwhp. Fastest blower c6z is a LSR block. Lots of real world great results, just not cheap.

MD, yah something about clearing out the exhaust for long 1/2 mile pulls so stuff doesn't melt.

Michael_D

I don't know anything about LSR blocks. When you order one, do they ship it with a finish hone, to the customer's spec? Or is your builder doing that? Can you get the block with camshaft rollers?

Unreal

I don't know about the hone. I think it is just a rough bore and builder does it. I know my builder (MVP) customer ordered my block with extra deck height, so he can mill the deck to exactly what he wants for the pistons/hg/heads and get it exactly where he wants which is why it took awhile. I think you can get cam shaft rollers. It is basically just an aluminum LSX block, so anything that LSX block can do, LSR can do. Uses all the LSX covers/parts.

Quiky One

Unreal

I do, one in the FI section and one in the c6z section.

Unreal

Still no word from BTR on cam specs. I wonder how long it normally takes. Seems a bit excessive.