BBC cam selection

[Rannos]

I am currently building a 496 bbc for my 64 swb. It will be 10.2ish compression with a set of 088 rect. port GM heads. The truck will be driven on the street but not often and its weighs with me in it around 3300-3400lbs. I am running a 3.73 with 28" tires (may change to a lower gear if the rear end gives it up). Mainly building the truck for me and my son to do the local 1/8 mile index racing... wanting to do the 6.5 or maybe the 6.0 class if the truck runs well. I have been looking at cams and there are soooo many similar cams I just cant make up my mind. I was originally going to go with a Comp Cams XR286R because I have a set of valve springs with titanium retainers laying around form an old project but seeing as I am gonna street drive it I am worried about spring pressure and such. So I started looking at flat tappet solids and even some bigger hydraulic rollers and now I am lost. I am more interested in a nice flat torque curve then peak numbers. Also I really don't want to spin this motor all that high (say shifting 62-6400). It will also see Nitrous every now and then.... no more then 200 shot. Anyone build something similar and have good luck with a certain cam or should I just call a few manufacturers and see what they say? Also anyone happen to know at what lift I will need to mill my valve guide bosses down at? Thanks for any information on this.

Jay

[redsled87]

If you go to Comp Cams web site, they have their cam quest program online. That's how I picked my solid flat tappet for my 468. The one that I picked has a nice torque curve to it too. The p/n that I picked was 11-606-5.

[Rannos]

Wow... called comp and spoke with someone about what cam I needed.... Tells me .680 .680 260 270 @.050 on a 108 LSA, solid roller. I admit I am not a wiz with figuring out cams but that seems like alot of cam for a street driven truck on 10.2 compression.

[kpeztruck]

Originally Posted by Rannos

Wow... called comp and spoke with someone about what cam I needed.... Tells me .680 .680 260 270 @.050 on a 108 LSA, solid roller. I admit I am not a wiz with figuring out cams but that seems like alot of cam for a street driven truck on 10.2 compression.

It does sound like a lot of cam for a street driven truck. However, it is not a lot of cam to run 6.50 or 6.00 in the 1/8th mile, even with a 200 shot. My cam is .738 lift solid roller, that sees, shall we say very limited street duty. I drive it to cruise-ins locally. No more than 8-10 miles from the house, and have to run 110 on the street with 15:1 compression. You are going to have to be honest with yourself, about how fast you want to go, in relation to how streetable you want the combination to be. I hope this helps. Paul

[WAAF]

mine

as of right now.. this was bought for a 496 build at 10.75 to 1
that may now change... but this is what I was advised to get for a 496 street/strip with maybe spray..
I may go hyd instead.. or go 12 to 1 .. well see..

[Rannos]

Yeah that's the cam I was originally planning to use. We have used it in a few motors and its a nice cam. I think I will most likely use it in this motor also. We did a 11to1 427 with oval ports with that same cam in a 72 nova a few years back and it ran 10.60's in the 1/4 on motor. Wasn't to hard on parts either, which is what I am after. I don't want to be changing springs out 2 to 3 times a year/season. The truck will be driven on the street to local car shows and meet andd greets. Maybe driven to work a hand full of times a year (20miles). I really don't see why icouldn't run the 6.5 class on motor and spray it for the 6.0 class withthe motor I am building. Only thing I see holding me back is gear ratio. Which I have a car 12bolt with 4.56's waiting to go in it...I just hate the idea of driving it any where with that ratio and a T400 tranny. Anyway, thanks for the in put.
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