billymgb1000

I have a 4.8 in a 74 MGB she weighs about 2200 and I have a edelbrock 600 carb I rebuilt the motor just stock the heads are 862's I want to have a lumpy idle (don't need vac for brakes) I was told I should have a 224/228 112 lsa and stay under .600" lift but I can't find those numbers just wondering if anyone has a part number for one even close to that also I seen the ls6 cam is pretty cheap and would that work thank you if you can help me

speedtigger

iTrader: (16)

I think a GM "Hot Cam" might be just the ticket for your situation.

https://sdparts.com/details/gm-perfo...parts/12480033

Or, if you want somthing rowdier, there is GMs "ASA" cam:

https://sdparts.com/details/gm-perfo...parts/88958770

billymgb1000

thank you speedtigger that is great finally, do you know if that first cam would have a lumpy idle I know the second one does

speedtigger

iTrader: (16)

What most guys do is go to youtube and type in "hot cam idle" or "ASA cam idle" and determine what they like that way.

The reason I suggested those two cams instead of an aftermarket cam is because you said your primary concern is idle and not the ultimate in power. I am not saying those cams are not powerful. They will make more power. But, they are less money and are easy on the valve train.

Dickbob1992

iTrader: (1)

Granted, you have a lightweight car, but I wouldn't get a cam as big as those two for a 4.8. I'd get a lower duration car and use a low lsa like a 21x/21x on a 110-11 lsa

newschool72

iTrader: (12)

I think the Hot Cam would be fine with the 219 at .050 on the intake. I don't , however , agree on the ASA cam. That is a lot of cam for a 4.8, and even on much bigger engines, the idle characteristics are hard to control. That ASA wasn't ever really designed for the street and is built to be easy on the valve train while still offering serious mid and high end grunt, for road racing apps. My .02 would be to give your specs to a couple good cam gurus and see what they say , based on your intended use for the car. You have a fairly unique setup, with a super light car and baby cubes.

jbrenner0188

I wouldn't wast the time and money doing a cam swap and put those cams in, there is way better sounding or performing cams out there but that's just my thoughts...a gm hot cam is lucky to give 20 hp and is not very lumpy

ZONES89RS

iTrader: (25)

Reasons like this I am not happy I have not put my edelbrock 2215 in yet. 220 single pattern like that should be exactly what thug guy is asking for on a 111 lobe for carbed setups is great for small cubes.

Mine is still sitting in the shelf.

speedtigger

iTrader: (16)

I don't think a cam with that little of a duration will have the idle characteristics that the OP is looking for, even with that narrower LSA. In my experience you have to get to about 220 @ .050" combined with a narrow LSA to get the idle he wants.

I think you are right on this. It would be advisable to choose the Hot Cam over the ASA on a 4.8.

You have to look at what the OP said his goals are. The only thing he stated for his motivation was a "lumpy" idle.

You also have to consider that the stock 4.8 cam is smaller than the LS1 stock camshaft, so his power gains will be larger than somebody doing and LS1 upgrade.

As for the idle, you have to remember he has a 4.8. The smaller cube motors will have a lumpier idle than the larger motor with the same camshaft.

As for not wasting your time, consider that not everybody is in the LS1Tech dyno chaser niche. Some people just plain don't care about the things that most guys on here might think is the end-all be-all. Think about what he gets with a Hot Cam. It is low cost, easy on valve train, good broad torque curve and will likely deliver the sound he wants in his 4.8.

newschool72

iTrader: (12)

I don't think that the Hot Cam is a dog either. GMHTP did a cam comparison a few years ago to see what different cam manufacturers had to offer for a STREET friendly cam for the then new LS3 heads. I know the OP is running cat heads, but I think its still a fair comparison. Most of the big names threw a cam in the mix and GMHTP decided to add the GM Hot to the list for GMs contribution. It held its own against some pretty impressive cams even though it had by far the shortest lift. In the mid range it was actually close to the top. It may not give much more than 20-30HP at peak HP, but that is only a small part of what usable power really is. A big increase at peak HP always comes from a higher peak RPM, and the higher peak RPM comes from pushing the torque peak higher in the rev range. That means torque will suffer below peak. Unless someone is going for impressive peak dyno numbers for bragging rights Or is building a drag car that will be kept in the peak to peak power window, a smaller cam will usually give you more usable power.
If not for the economical price of the GM cam, I would still suggest a tighter LSA than the 112 the Hot Cam has, to get that small engine to act sharp and aggressive . But I do think the GM cam will give the OP what he is asking for.

billymgb1000

thanks to everyone for your input so it looks like it is the GM hot cam I will post how she goes when I get her back together

stock48

iTrader: (17)

Something 218-220 on a 107-108 lsa would have a nice little bump and not need to turn 9k to get moving.

ZONES89RS

iTrader: (25)

Yup, like the damn edelbrock 2215.

billymgb1000

is the asa cam 226-236 .510 lift and 110 lsa good with a carb instead of efi

ZONES89RS

iTrader: (25)

Will do great but the edelbrock 2216 is 230/236 and has .540 lift, so that's the way I would go.

speedtigger

iTrader: (16)

You already have a thread on cams for your car. I think this is a similar enough discussion to keep it all in one thread. I have merged the threads. ~ Speedtigger

And, didn't you say you have a 4.8 liter engine? That cam will work and it will have the rowdy idle you want, but it may be a bit much for a 4.8 as NewSchool suggested.