Hi fellas, after a failed google search I would like to ask what does a computer compatible cam entail that a regular cam doesn't? I have a lb9, but I'm swapping it for a 880block and 906 heads (hopefully with a modified lt1 intake for compatibility). I got quoted for a 3-400 dyno tune. Once again however, what does the computer compatible part mean?

 

Normally a wide LSA, very little overlap. Generally speaking, if it's not wild enough to **** off the computer without tuning than it's not wild enough to make much more power than stock.

-- Joe

 

So one that's not computer compatible would definitely require a custom tune?

 

So a dynotune is a must for a much heavier cam?

 

Yes. "Computer cams" were designed as cams you can swap in without changing the tune. In a perfect world you would tune the car regardless, but that was the general idea.

Those heads have a .460 lift limit unless you are having someone machine the pockets, re-valve it, and run comp 987 springs. Keep that in mind when choosing a cam.

Assuming the heads were done right, I'd be running a comp 08-503-8 cam, high 9s compression to 10:1, a good tune. Should make over 400hp.

-- Joe

 

I'm doing a little head work and hopefully the lt1 intake is someone around here will mod it for me. As well as headers and exhaust. Around 10.5 to 11 compression (so premium gas) but the duration on that cam seems like it would have a lot of overlap (granted I'm new to this with limited knowledge, feel free to correct me if wrong). I don't want to completely destroy my gas mileage. So maybe an lt4 hot cam with 1.5 rockers? If my memory serves me right it doesn't have such tremendous overlap (relatively speaking fir a street car). What's the power band of that hot cam? Do you think it's a good choice?

 

By Head work I meant port and polish. Also the intake. Eventually a bigger TB, but not at first.

 

The hot cam is designed to be used with 1.6 rockers

 

The more static compression you run the more overlap you will need to bleed off otherwise you'll be fighting detonation.

The LT1 intake isn't a great idea. You'll need to redrill the bolt pattern, then get the distributor mount hold and hold down in the rear. Then you'll need to modify your heads for water ports, then run a remote thermostat housing. You'll end up chasing air bubbles for a while until you get them all out of the system, and probably pay more money in the end than a used HSR.


-- Joe

 

Ok, I guess I could also just got aftermarket runners for the tpi and port the base plate

 

You'd also need to modify the baseplate to fit the vortec bolt pattern.

I'd probably go in a different direction.

-- Joe

 

Just shell out the cash for the HSR, its worth it. I'd go with the 08-503-8 cam rather than the LT4 hot cam. I've never been satisfied with the power it made in my HSR vortec 350, and I'm running 10.6:1 compression.

 

I would love a hsr or simiar. But I never see many on ebay. This is a budget build. Hoping for 350rwhp. What do you guys think of a aftermarket runners/ported base? Does it make my goal harder to achieve?

 

Another question. I've never owned a carbureted car (I'm a 20 yr old college student with a limited knowledge, and a desire to learn, with champagne ideas and beer money haha) and I see these high rise EFI intakes. They look like they're made for a carb, but they have 8 injector sockets. How do these work? How or what type of throttle body do you use?

 

Just single plane intakes. They have a 4150 flange on them, which is common amongst carbs and 4bbl throttle bodies. Some of us run 4bbl throttle bodies, others run adapters. I'm running an elbow adapter (edelbrock #3848) and an LS2 style 94mm throttle body.

-- Joe

 

Aftermarket TPI components are going to run you close to what a Stealth Ram will cost you. 350 RWHP is going to be difficult with TPI unless you want to run high compression and a heavy cam or stroke it. Going with a carb will probably save you some money, but I'd stick to TPI if possible.

 

Crap... Your right. I keep forgetting the bolt pattern difference... But I wasn't aware they made a Hsr or mini ram for the l31 heads? The only intake I hear about for it is the marine intake....

 

I actually googled something similar yesterday.
But I was looking for any computer compatible cams that would be solid flat cam.
I currently have a xfi280 flat tappet cam with my sbc400. I had it on my previous engine (sbc 383, with 11-1 compression and made 377rwhp with 1 5/8 shorty headers)

Anyone try a solid flat cam with a computer controlled car? (I have the stock tpi speed density )

 

With the benefits of roller lifters and roller cams, idk why flat tappet still exists. I can't answer your question. I'de PM anesthes tho, that man knows his stuff, he didn't fall off the cabbage wagon yesterday.

 

Money! That's the only reason why I went with flat tappet.
It would be another $800+ to get a roller cam with roller lifters

 

True. Well I have a l31 short block and some 906 heads if your interested!

 

Did some more searching and found my own thread that I forgot about. D'oh


https://www.thirdgen.org/forums/tech...olid-flat.html