I am looking at a new cam, and of course there are many choises. My chip will stay stock for now. I need to know how much I can do before freeking out the computer. 204/214 110*, 216/228 112*, some where inbetween?

Stock 305 heads, headers, plan to siamaze(sp) the base at the same time.

 

The latter is about as big as you'd possibly want to run with stock heads. I know a guy running a similar cam in an 86 and the stock chip did OK enough with it. Of course it can be improved though.

With that much cam and especially a siamesed base you'll need a converter and maybe gears. And you'd really want to be in the chip to get it to really move right.

 

I am Looking at the same issue; I have a 1985 computer driving a 1974 60 over 350. I am using the 85 intake, with the usual freebie mods. 24# SVO injectors have been procured, but the supplier pooched it on the cam, giving me a CS274 (194/204 Aiiigghhh!!). parameters are as follows:

1983 Berlinetta, 3300 pounds 350/A4/ 3.08 going to 3.42, headers, high flo cat, 2 1/2" exhaust

These are the cams I have a choice of:

Small Block Chevrolet Camshaft profiles

Part # Adv. Dur. 0.050 Dur. Lift @1.5
-------------------------------------------------------------------
Int. Exh Int Exh Int Ex

LB9 (1985) 320 320 202 206 404 415

229-1871 269 271 202 206 404 415

L69 320 320 410 423

L98 202 207 413 428

229-2201 278 288 204 214 420 443

SUM-1102 262 272 204 214 420 442

229-2203 283 286 209 216 435 455

SUM-1103 272 282 214 224 442 465

SUM-1105 282 292 224 234 465 486

229-2205 288 298 214 224 443 465

I ran the SUM-1105 previously; relatively bad mannered and poor gas mileage for the performance given. I am leaning towrd the 229-2203, due to my engine's better flow characteristics compared to stock. These cams are all flat tappet btw...

 

Go to Ebay. Search for "CAM CHANGE KIT" will take you to a 229-1713comp cam. Same basic cam used in 327 and 350/350HP muscle cars. You will need to change the gear on the distributor and possible some chip burning. May work halfa** with stock. Specs:292 292 223 223 447 447 LSA int 110 LSA exh 118

 

Too much expense/work. This is my daily driver, so I need excellent drivability and mileage too. LT1's were not known for this. I ran a very simular cam earlier.

 

I have a 218/224 495/503 112 lsa cam and it idles smooth and drives fine on the stock chip. doesnt make good power cause of the chip for for drivability you could drive it everyday

 

You should stay with 220 deg. or less, and 112 LSA or more.

 

Went with this:

209/216 @ .050, .435/.455 lift @1.5

I already have one toy that burns hi-test like a starving brontosaurus...

 

?????? WTF ??????? Well I'm amazed enough already, but don't you get crappy gas mileage though?

 

I ran a 218/224 112LSA with the stock chip also. The BLMs would bottom out at 108 due to that cam making the car run rich as he11 at idle. However, the integrator was still able to compensate. This is probably the biggest cam you could run on a stock chip without bottoming out the BLMs. For those who don't know - when the BLMs bottom out at 108 then the computer can no longer adjust the fueling to get rid of a rich condition.

However, with all of that said, open loop sux. For the first couple minutes on startup BEFORE the ECM goes into closed loop you are literally washing the cylinders with gas. This is terrible.

Just learn how to program you own chips. It made a huge difference for me.

Tim

 

about one or two whacks before it breaks in two...

 

Just FYI, after playing with Dyno2000, I decided on a cam. Compucam2030. I compaired it closely with the 209/215 112* style, and the 2030 cam make only 4 peak hp less, but a much flatter, and wider torque curve. Combine this with the chip likeing it better, I felt this would be the better choice.

 

I should be getting this cam UPS tomorrow. This 2030, is it a roller cam?

 

I drove it with the stock chip all last year and got 23 MPG. My blms at idle with the stock chip are 125-129 and at start up its about 117

 

BLMS..????PLEEZ EXPLAIN TO THIS AMATEUR

 

BLM - Block learn memory, long term fuel adjustment.

Integrator- short term fuel adjustment

READ! http://www.gnttype.org/techarea/faq/BLMINT.html