[manchildau65]

I'm looking at buying a new cam for my 400 sbc and think the Performer RPM would be a good match with my set-up. The only concern I have is that Edelbrock states to not use their cam with double valve springs or different than stock ratio rocker arms... both of which I'm currently running. I can't recall off hand the double valve springs I'm running but the rocker arms are Cower 1.5 and 1.6 roller tip rockers. I don't plan on changing either of these components

So the $169.00 question is: Should I run the cam or is this going to cause the issues Edelbrock warns of (lobe flattening with debris going through the engine)?

Thanks for the help!

(BTW: I'm currently running a Summit brand hydraulic cam... with no issues other than where the power band is)

[techinspector1]

Originally Posted by manchildau65

I don't plan on changing either of these components

You can poke a bear with a stick for only so long, then the bear's gonna hurt ya.

[DoubleVision]

Look at the specs of the Edelbrock cam. Now, look at the specs of Summit`s cam lines, look familiar? I would go with a cam from Isky Or Comp.

[GenYnNC]

Here's the same cam with lifters, matching springs, seals, keepers, and cam lube for $165. (This is on a 112LC, they also have the same grind on a 106LC)

http://www.competitionproducts.com/E...ctinfo/E1067K/

As for the non-stock rocker ratios and double springs... that's your call. I've never had a problem with those items and cam break in but it could just be an install away for me.

[manchildau65]

Originally Posted by techinspector1

You can poke a bear with a stick for only so long, then the bear's gonna hurt ya.

So insightful... thanks for the help!

[juggalo360]

i actually just bought the edelbrock 2102 cam and lifter set. it seems to be working very nicely very lumpy. doesnt like to idle too much when cold tho.

[manchildau65]

Thanks for the replies, I guess the big question I was wondering is if Edelbrock is just trying to sell additional items (such as the valve springs they reference) or if their cam material / heat treatment were truly different then the rest.

Ultimately, I'm looking for power from ~1K to 6K and felt the Performer RPM was pretty close to this... plus my performer RPM intake and 1407 carb should compliment it pretty well. (The current Summit cam I have makes power between 3k and 6.5k, which isn't bad but I'm looking for something with a broader power band that starts sooner).

[Greg T]

If you don't listen to them the cam will go flat.


`

[techinspector1]

Originally Posted by manchildau65

So insightful... thanks for the help!

I'm pretty sure you had a sneer on your face when you wrote this. All I'm saying is that you had better pay attention to what the cam grinder wants or you're gonna be cleaning mush out of the oil pan.

[cool rockin daddy]

To follow up with what Inspector said, why in the world would you go against the recommendation of the cam manufacturer? You have heard of the Edelbrock Total Power Packages, haven't you? Only been out for 25 years. They match up everything you need to achieve the power level you want. But, hey, do what you want. It's your engine. Just depends if you want to keep it running or not. Sorry you didn't get the answer you wanted, FNG. No reason to sneer at what one of the most respected members on this board posted in response.

[bentwings]

I have the full RPM package in my ride and I'm way over 13k miles now. I ran it briefly with a single 750 carb on an AirGap manifold and now have a solid 6-71 blower with 2 750's. It will run up to 6000 rpm so easy it is frightening. I do use a 1.5 roller rocker arm but so does Ed.

I see no reason to use any other springs especially stiffer and no reason at all to run any other ratio than the 1.5 rocker arms. Do use a quality set however.

You have to understand that Ed has a huge engineering program and this well proven combination has been around for years. Plain and simple .....it works. They have probably worn out more dyno mules testing and developing this combo than most of us have had motors in a life time. I love to ask these questions..... Who are you to change this combo for the better??? How will you prove it?? Let's see your data. If you are going to stick different parts into this you are entering the unknown. When it fails you have no choice but to come back with this.. haha

If you have to toss some parts to get reliability so be it. With today's oil situation I would never go against the mfg recommendations when it comes to valve train.

This a street package and works extremely well when used as designed. The simple way is to call ED and spend a few minutes with them. If they say ok well they probably have already tested it or have a good reason to say no.

Please don't get offended if some of us are blunt and to the point. Most of us have done some really dumb things but we have learned from the mistakes. We are really trying to help out and save others from real heart aches.

[manchildau65]

Originally Posted by techinspector1

I'm pretty sure you had a sneer on your face when you wrote this. All I'm saying is that you had better pay attention to what the cam grinder wants or you're gonna be cleaning mush out of the oil pan.

I was expecting a little more quality of a reply (like the second one you sent) especially if you're, "one of the most respected members of the board".

I understand what everyone is saying, hence me asking for advice prior to simply buying and installing what appears to be a valid manufacturing statement. My intent was to validate Edelbrock's claim... statements like these are made all the time to influence people into buying more "name brand" products.

[manchildau65]

I'll try and get through to their tech department today to see what their reasoning is. My assumption is that if the statement is true, then the lobes aren't case hardened deep enough to accept the force of the double springs.

[engineczar]

The reality is that Edelbrock is using that statement as an out in cases where a cam may go flat. If the pressures and rates are the same then whether or not the springs are single or double really doesn’t matter. Howards Cams sells a stock diameter single spring with a rate of 425# per inch which is higher than many double springs. Pressures for double springs are all over the map and yes some are high enough to flatten a cam. In your case you really need to find out what spring pressures your current setup has then match it up to Edelbrocks requirements. One advantage you have is that your springs have probably relaxed over time from use and aren't what they were when they were new.

[Greg T]

Originally Posted by manchildau65

I'll try and get through to their tech department today to see what their reasoning is. My assumption is that if the statement is true, then the lobes aren't case hardened deep enough to accept the force of the double springs.

Using Edelbrock's tech support is like having the 6 year old neighbor kid perform brain surgery.