Hey guys building a new bbc for a buddy of mine need a few sugesstion. .60 over bbc to make a 468 454 steel crank gm 3/8 rods with arp bolts sqaure port open chamber heads with 2.25 intake valve and 1.88 exhuast with pocket ported bowls and matched intake runners. 10.5 j.e pistons chet herbert roller cam 280 int 280 ex at .50 224 int and 224 ex .595 in and .595 ex 110 c pete jackson gear drive.

what would be a good manifold and a good carb to run? what kind of power will it make? might hit it with a shot of 150 nos. thanks sean

Oh my gawd!You said "square port heads",now your gonna get an ear full............just kiddin'ya,I had a similar setup and used a weiand stealth(square port-dual plane). It worked great!

Gear drive and roller cam, that might be interesting harmonics and it might work fine,I've no experience with geardrives. I'd go dual plane and 750 DP minimum. It ought to make 500hp, whats it going in?

Are those cam specs 224 at .050? If so, thats a little on the small side Id say in a 468 with 10.5:1 compression. Thats a hydro roller cam right...I looked it up and the only one of those specs was a hydro roller cam? Well, I shouldnt say its small if you plan on keeping the revs at 6000 or less.....in that case, its about right With a mild 2500-2800 converter and probably a 3.73 gear youd have a fairly streetable ride that should run mid to low 12's. It could go better, but thats a safe estimate Id say. Personally, Id keep the compression down at 10:1, especially with the plans for nitrous. Not a huge difference really, but the cam doesnt sound like too much of a rad cam, and I dont think that particular cam will call for much more than 10:1 to run well. Keeping it a little more modest will give you a little more leeway on the juice. Thats not a prob if you dont mind higher octane fuel on the bottle. However, I wont comment on wheter that cam and compression will work well or not with pump gas in naturally aspirated form at the drags. It might be smooth sailing, or you may need a little additional octane or work the tuneup a bit to get it to run without any pinging. Id ask the guys at herbert and see if they think your compression is gonna be ok to run full on with pump gas and that particular camshaft.

The cam is a solid roller CBH3- I wanted to keep it a little small so he could tool around on the street-herbert said 10.1 minimum on the compression. it is going ina 71 camaro total street car. I have the tendancy to get quite radical so this was a little out of the norm.The heads were a set I had on the shelf. I think If I put the cam in at 108 it should make run pretty good and shot of 150 will work with the heads. probably shift it at 6500 rpm. 3.73 gear and a 2800 stall.

That helps a bit. Funny, they have a hydro roller with identical specs, yet it didnt find a solid anything like that one in their online catalog. Either way, being that its a solid roller, it will be prone to rev a little better. I dont know if it will hold its gound all the way to 6500 strongly, but it should rev well enough. Not a bad deal I guess for a total street car. The specs you gave are a little decieving. From what it looks like, I wouldnt think it would need 10:1 minimum just to perform up to par. I woulda though you could go a little less, and 10.5:1 would be getting closer to the upper limit. But like I said, I dont know all the specs and if Herbert calls for it, than it should be pretty accurate. A high rise dual plane oughta have enough steam to keep up with that cam well enough, and itll be better for the street. Yet a good single plane wouldnt totally kill the low end response(although it will sacrifice some), so it would still work on the street well enough, and it should have a little better pull over roughly 5000rpm as well as being the better option for nitrous........Decisions decisions. At the same time, a 150 shot isnt so large that your doing wrong by running it with a dual plane either. I think you could go either way and not have too many complaints. If you want to assure the best streetability, go with something like a performer rpm. If you want the best results at the drags, along with the best response on the juice, go with a single plane and it will still move around just fine on the street being that its sitting on top of a mild, solid roller cammed 468.

There's been talk at www.realoldspower.com (http://www.realoldspower.com) about Pete Jackson gear drives. Specifically, that they tend to break camshafts.

Both the torque of the crank and friction of the cam cause the idler gears to try to slide to the left side of the engine. That produces stress by wedging one idler gear between the crank and cam gear, pushing the cam gear "up". Eventually the cam fails.

I don't have experience here, just passing along a thought. Personally, a good chain is good enough for me.