I have a 406 with 10/1 compression, a ****ty set of stock 76cc heads that have been shaved 20 thousandths, they have 1.94 intake and 1.5 exhaust valves, and the cam I am using is a crane cam with 224/234 duration at .050 and 465/488 lift. The lsa is 114*. I am running long tube headers with true duals. any way, what I want to kow is will this be a good power cam for this motor or is it to small?? I want a good lopey idle, will this cam give me that?? the trans I am using is a th350 with a shift kit and a 2600 rpm stall. thanks

 

The Intake peaks at 109*, the exhaust at 119*.

119*+109*
2

=114* LSA

http://www.cranecams.com/?show=brows...02&lvl=2&prt=5


As for the cam choice, what intake/carb are you running, what headers, how much gear, what heads? The idle won't be that lumpy in a 406 but don't base cam selection on idle sound. Base it as being the best match for the rest of your parts.

 

intake is a weiand X-celerater and carb is a 750 holley. I know I should be thinkin of performance instead of sound but I want both, lol. I am not tryin to build a race car, I just want it to perform real well on the street and sound mean as hell at the red light.

 

by the way thanks for finding out my lsa

 

anybody???

 

Is the compression a known number? Like did you run it through a calculator? Because, with a motor like a 400, they can take a bit more cam than what you would toss into a 350 and retain the same manners as a 350.

All other points the same, I would consider even jumping up to the Xe282 or similar. However, the heads, you say flow very...crappily (is that a word?). That will hurt things a bit as 400's like to breath. And naturally, the higher you rev, the more they like to breathe. As far as the heads, they sound like some mid 70's smogger, the 882 or similar. Not a very good performance head, to say the best.

What are the heads? What is the peak lift they can take? Rear gears? Desired RPM range? Lope is good, yes, however, lope and idle quality are inversly proportional, keep that in mind.

 

heads are 3998997 and shaved 20 thousandths with 1.94 intake and 1.5 exhaust. I plan on upgrading later just trying to recover from the engine cost and trans cost, lol I will replace them in a few months 3 or 4. what is the duration and lift of the cam you mentioned?

 

You won't be that impressed with those sucky heads...I have the same cam in my 406 and when it was carbed, the heads limited top end...actually it felt like the TPI bottleneck above 4,500 rpm...

I thought that cam idled pretty well though...a bit of a lope to get people know it wasn't a stock 305

 

how much lope?? I want it to sound mean and I plan on changing heads in a few months when I can afford them, saving up for them, lol

 

The 114* LSA means that you will have a decent idle and it is still EFI friendly.

A lope is a lope...too much and it won't run...Believe me, it doesn't sound stock...but it depends on your tastes.

 

well I am running a holley 750

 

Yes...I saw that you are currently running a carb...but I used that cam because I wanted to be able to upgrade to EFI...which I did...

Nothing like planning for the future...

 

oh ok I see what you are saying, lol. Well I will give it a try since I already have it, and if I don't like it I can always change it when I get get my new heads in a few months.

 

The cam works in a 406...a good balance of torque and some upper power...meaning it will have good street manners from my experience.

Good luck...

 

Well man your running a similar setup to me actually. I have a 400 .20 over with 10:1 compression also. I used the comp 274H xe cam with upgraded springs to match. The cam is .490 .490 lift. This summer i ran shortie headers with small primaries, a basically stock alum intake, and stock 624 heads (lightweight 882's) with open exhaust at the track through a y pipe. Take in mind this is one of the worst flowing gm head. I had very little noticeable lump to my cam and really none with the exhaust on. It ran like a dream all year and i drove it to the track every weekend 320+kms without a single problem all year. My best time of the year was a 13.8@97 with that combo with no stall at all and a stock t-200 tranny. Many people said the cam was to big for my engine but its not and actually your heads flow better then mine so if i was you I may even go a bit bigger or something along the lines of .490 .510 and it would still be a very streetable car with tons of top end and mid range. Plus the large displacement keeps the idle relatively smooth and your bottom end torque would stay decent because of the extra cubes also. You could go a little smaller to like the same size as mine and that would also be an awsome cam for your car with your setup and would have a fair bit of torque to spare. If your looking for a lopey idle use the .490 .510 and have the idle nice a lowwww.....and dump the exhaust .

 

if it was my motor i would use comp cams 290-307 230-244 510-540 on a 112 lobe sep....also i dont really like the intake you currently have an air gap or a victor jr......

 

yea I don't care much for a single plain intake on such a mild engine either, but it was all I had. I plan on changing it as well as my heads in a few months when I get some more money saved up. I would like to get a cam that works well with my setup and gives me that mean azz lopey idle

 

the cam i mentioned sounds great and performs awesome!!!!!!!!
i know what ya mean about the avail. cash flo

 

well I may try it, how much is it? does it come with lifters? it is a flat tappet and not a roller or sollid isn't it

 

Ohhhhh i missed the single plane thing........get rid of it or bye bye torque unless you go with a small cam which in reality will defeat the purpose of having the single plane in the first place. It will prolly mph good but wont wanna get its *** off the line too great.

 

Oh btw what kinda gears are you running? That will make a fair bit of difference too.

 

I am gonna get a posi and run 3.42. would a performer rpm be a good intake.

 

Yep i run a 3.42 open rear with slicks and no traction problems with true slicks on it. When i borrowed a buddies air gap (supposed to be virtually the same as rpm) i went from a 13.89@97 to a 13.6@102 just a hair under actually. Keeps your torque up. I was impressed with it and i hadnt even tuned it actually so i was getting some bog off the line that dropped my original 1.9 60's to 2.1's which is roughly a couple tenths or more. I had enough mph to run a way better time too.