sbc cam question
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sbc cam question
Posted: March 28 2008 10:06 PM
 
David Hughes (aka DaveHughes) [ View ] [ hugheshotrods@verizon.net ] [ Car Ads ] [ Blogs ]
seaman, Ohio
(937) 386-3279
 
I have decided to swap the camshaft in my 33 cabriolet. It has a 300hp -350cid GM crate engine with a whopping 1500mi on it. It runs fine for me but I am wanting the lumpity sound and this one sounds like a sewing machine. My buddy contacted lunati cams for me and they have come up with a grind that is supposed to be the best of both worlds -meaning having the rough radical sound yet being drivable. I thought I would share the specs and see what some of the experts on here Thought of it. Keep in mind It is a 350th trans with no stall convertor, and I do want to keep this drivable. it is 477 lift 225 duration- 108 lobe seperation- again- not so much interested in performance as much as sound and drivability. And I will be changing the springs of course. thanks In advance for any help....
 
 
Comments
 
Posted by bigdude  -  03/28/2008 10:16 PM
Dave I went with a 268 xe from comp-have had 2 cars with them. I too was looking for the big cam sound with a little drivability. Most people thought it sounded much bigger. I have had pretty good results from lunati except for them dropping the ball on my 460 ford engined 40.
resident know it all [ View ] [ Email ] [ Blogs ] [ Car Ads ] Three Rivers, Michigan Charter Member since January 2004
 
Posted by pooch  -  03/28/2008 11:10 PM
HI Dave!

Really like my comp cam ,Thumper ,sounds like what you are looking for


Drive it like you stole it!

Buster.
pooch [ View ] [ Email ] [ Blogs ] [ Car Ads ] albany, Oregon
 
Posted by dixie  -  03/28/2008 11:44 PM
CHECK OUT COMP CAMS THUMPER SOUNDS LIKE JUST WHAT YIU WANT.
jim grace [ View ] [ Email ] [ Blogs ] [ Car Ads ] dade city, Florida Charter Member since January 2006
 
Posted by JAWS  -  03/29/2008 01:20 AM
Bigdude is right, that Extreme Energy cam profile is nice, even the 260 xe is a nice cam. Ive run that same Lunati cam and it is a good cam, just doesn't have enough vac, due to the tight 108 lobe sep. angle.


-Brant
An electrical headache can make a great car a pain [ View ] [ Email ] [ Blogs ] [ Car Ads ] Boise, Idaho Charter Member since August 2004
 
Posted by 37tin  -  03/29/2008 01:46 AM
Y'know JAWS I didn't think of that,,I'm going to check and see what I do have for vacumn, what does the advance and booster need, thanks ,
37tin [ View ] [ Email ] [ Blogs ] [ Car Ads ] langley, Canada
 
Posted by roofcam34  -  03/29/2008 02:42 AM
TIN....The brake guys always tell me that you need 16-18 with a booster. I know you can get by okay with less than that.
Leo (roofcam34) [ View ] [ Email ] [ Blogs ] [ Car Ads ] Sioux City, Iowa
 
Posted by JAWS  -  03/29/2008 08:14 AM
Roofcam is correct. I think you could operate power breaks at a little less. I have, and had no problems, they were just harder to work and took more foot power.


The advance issue, well usually it is hooked up at idle and they usually are from 5-20 or so inches of vac adjustable, or 10-15 or so fixed originally. In order to take full advantage of the advance unit, you would need at least as much at idle as it was intended to use. If your unit is a 15 incher, then you need a minimum of 15 inches at idle to take advantage of the unit.



-Brant
An electrical headache can make a great car a pain [ View ] [ Email ] [ Blogs ] [ Car Ads ] Boise, Idaho Charter Member since August 2004
 
Posted by Crazyhorse Rod Shop  -  03/29/2008 09:04 AM
extreme energy 268 by comp like big dude said. i use them in everything i build. plenty of vac , nice rumble, good low power range. dont forget to order the comp additive with it. i run rotella to break in a new cam.
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by gman0046  -  03/29/2008 10:55 AM
Dave, unless you've changed out the engine on the 33, the one you bought it with was the $1400 four bolt main crate motor which I believe is in the 240 HP range. Check the numbers with Mortec. Thats a great motor on which the addition of a performance cam will add a lot. Go with the Comp Cam as BD suggersted including roller rockers. BTW, Chevrolet Parts Departments are again carrying the Engine Oil Supplement (EOS) but they now call it Assembly Lube.
gman0046 [ View ] [ Email ] [ Blogs ] [ Car Ads ] Anchorage, Kentucky
 
Posted by DaveHughes  -  03/29/2008 11:44 AM
Your right Gman I dug my paper work out on the motor and it is a 260 horse engine not the 300-as I said earlier- I should have known due to the non center bolt heads- But wasnt thinking- all these cars run together after awhile. Everyone talks highly of the comp cam so I am leaning towards that. Which specs actually make the cam have a rough idle- Some say it is the lift- others say the duration - While others say you can run more lift with less seperation etcc. What actually makes the thing sound good? Great advice on the rotella shine But I hear they have recently taken the zinc out of it also so I dont know how it would be on cam break in. I will defintly put some sort of additive in it to start- I hear lots of flat tappet cams are getting chewed up due to the loss of additives in todays oil.
DaveHughes [ View ] [ Email ] [ Blogs ] [ Car Ads ] seaman, Ohio
 
Posted by gman0046  -  03/29/2008 12:03 PM
Dave your right about the Rotella, they have reduced the zinc content for EPA reasons. On my 350 with the Comp Cam and roller rockers , I also had to go with tall valve covers as the rollers wouldn't clear the short covers. I don't believe the break in is that critical with roller rockers but I'd for sure use what ever additive the cam manufacturer recommends.
gman0046 [ View ] [ Email ] [ Blogs ] [ Car Ads ] Anchorage, Kentucky
 
Posted by Crazyhorse Rod Shop  -  03/29/2008 12:42 PM
you can still buy rotella for older equipment. they make a new oil for newer trucks. i use it for break in on new engines. if not the comp additive is only 16 bucks. some cam failures are not due to oil but improper break in. i see folks fool around with one for an hour before getting it running right. first time i bust one off it runs for 15 min at 3k.
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by jdboes  -  03/29/2008 01:58 PM
THE STOCK CONVERTERS CAN COME WITH A VARITEY OF STALL SPEEDS, DON'T BE SURPRISED IF YOU END UP CHANGEING THE CONVERTER. A HIGHER STALL WILL MOST LIKELY CUT YOUR mpg IF THE CAM DOESN'T.
jdboes [ View ] [ Email ] [ Blogs ] [ Car Ads ] silver spring, Maryland
 
Posted by DaveHughes  -  03/29/2008 05:46 PM
Thanks A bunch guys !! You have talked me into a comp cam- I think I am gonna do the thumper- It is pretty similar to the lunati cut they were gonna sell me. I Forgot to mention that my car dont have power brakes so the vac shouldnt be a big issue- if the convertor dont work out I guess I will go there next . Might as well do it you only go around once I will let you all know how it turns out.
DaveHughes [ View ] [ Email ] [ Blogs ] [ Car Ads ] seaman, Ohio
 
Posted by DaveHughes  -  04/01/2008 08:51 AM
Yesterday morning I ordered the Comp cams thumpr and springs. If all goes as planned I am gonna tear into it tonight. I will keep you all posted as to my results.
DaveHughes [ View ] [ Email ] [ Blogs ] [ Car Ads ] seaman, Ohio
 
Posted by Crazyhorse Rod Shop  -  04/01/2008 08:54 AM
your converter will be fine. i use the tightest one i can.
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by dixie  -  04/01/2008 11:28 PM
YOU WANT B SORRY U WENT WITH THE COMP THUMP.
jim grace [ View ] [ Email ] [ Blogs ] [ Car Ads ] dade city, Florida Charter Member since January 2006
 
Posted by DaveHughes  -  04/02/2008 09:10 AM
Well guys its in... we worked pretty late last night and took it all apart, And got as far as getting the new cam and springs in and then had to quit. Gonna work on it again tonight but I am polishing all the shiny stuff as it goes back together and easy to get to. I can hardly wait to hear it. I dont think I slept more than 10 mins at a time last night
DaveHughes [ View ] [ Email ] [ Blogs ] [ Car Ads ] seaman, Ohio
 
Posted by ol bear  -  04/02/2008 09:51 AM
DAVE HAVE U FOUND THE SITE THAT TELLS U HOW TO SET HYDRALIC LIFTERS WITH THE ENGINE OFF ??? I LOST IT .......................LES AKA OL BEAR
OL BEAR [ View ] [ Email ] [ Blogs ] [ Car Ads ] crown point, Indiana
 
Posted by gman0046  -  04/02/2008 09:55 AM
Any questions about Chevies go to www.chevytalk.com. You can get any Chevrolet questions answered.
gman0046 [ View ] [ Email ] [ Blogs ] [ Car Ads ] Anchorage, Kentucky
 
Posted by DaveHughes  -  04/02/2008 10:05 AM
Les I have always Set the valves with the engine running- With a set of old valve covers with the tops cut out.
DaveHughes [ View ] [ Email ] [ Blogs ] [ Car Ads ] seaman, Ohio
 
Posted by ol bear  -  04/02/2008 10:13 AM
HEY DAVE I DID TOO UNTIL A CHVY MECH TOLD ME ABOUT DOING IT THIS WAY ........... LES AKA OL BEAR..GOOGLE ,SMALL BLOCK CHEVY VALVE AJUSTMENT
OL BEAR [ View ] [ Email ] [ Blogs ] [ Car Ads ] crown point, Indiana
 
Posted by tlp1968  -  04/02/2008 10:22 AM
I had my sponsor (years ago) set my valves on the bench and they were too tight. Hubby always set them running and so he reset them running and brought the engine to life. Now I don't have to worry about it - I went solid and can set them myself with my bump switch and feeler gauges take the guess work right out of it! :-) Oh and just to put my vote in....I like Crane and husband is a Lunati roller guy. Glad to hear the excitement in your post Dave...take some video of the old girl coming to life and send it to us!
StreetRodding.com Marketing Director [ View ] [ Email ] [ Blogs ] [ Car Ads ] Springfield, Illinois Charter Member since August 2003
 
Posted by DaveHughes  -  04/05/2008 11:13 PM
Well its ALIVE !!! WOW this thing really sounds good. we fired it up and tuned it in in the garage attached to the house-after we broke it in and set the valves-timing idle etc.. I went in the house and stuff had actually fell off the wall It really does thump.I was impressed but the other half not so thrilled with the new cam carnage.But I really like it and thank everyone for the input.I highly reccomend the thumpr series to anyone interested. I drove it around the block and it seems to have really woke it up. I will try to get a video posted soon.
DaveHughes [ View ] [ Email ] [ Blogs ] [ Car Ads ] seaman, Ohio
 
Posted by tlp1968  -  04/05/2008 11:37 PM
Great news Dave...I will be looking for that video!
StreetRodding.com Marketing Director [ View ] [ Email ] [ Blogs ] [ Car Ads ] Springfield, Illinois Charter Member since August 2003
 
Posted by 37tin  -  04/06/2008 04:05 AM
Yeah,,,,,,,,,, Feels good don't it !!! By the way, the wife told me my hotrod is too lumpity and noisey, I said, if you think it's noisey maybe your getting old, that statement has not come up again,,,,,,,,hee,,,he
37tin [ View ] [ Email ] [ Blogs ] [ Car Ads ] langley, Canada
 
Posted by Crazyhorse Rod Shop  -  04/06/2008 08:57 AM
dave, pull about 2-3 degrees of timing out
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by ol bear  -  04/06/2008 10:47 AM
why r we pulling timing back ????? just curious les ,,,,,,,,,,aka ol bear
OL BEAR [ View ] [ Email ] [ Blogs ] [ Car Ads ] crown point, Indiana
 
Posted by hotrodgene  -  04/06/2008 12:05 PM
Dave is the cam you used the Comp.cam 268H?
Gene Riffe [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint Petersburg, Florida
 
Posted by Crazyhorse Rod Shop  -  04/06/2008 01:19 PM
it's a secrete ole bar. i could tell you ............ but then i'd have to send bubbaearl n cooter on a bus trip.
dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003
 
Posted by DaveHughes  -  04/06/2008 06:00 PM
I used the comp cams thumpr- its the new grind they come out with fairly recently. the specs were almost exact as the lunati I mentioned in the original post but the lobe seperation was 107. There are 3 different versions of the thumpr ( and yes thats the proper spelling) the thumpr- the mutha thumpr and the big mutha thumpr. I installed the smallest due to keeping it as drivable as possible. I am very satisfied so far. You can go to youtube and punch in comp coms thumpr and there is a video of a 350 chevy on a dyno with each of the different cams in the same engine to hear the difference in the idles. Very cool..
DaveHughes [ View ] [ Email ] [ Blogs ] [ Car Ads ] seaman, Ohio
 
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