383 camshaft selection
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 4,435
Likes: 9
From: Kalamazoo Mi
383 camshaft selection
i need some advice on choosing a good camshaft for a 383 build. The goal is in the mid 400s for power (not more then 480hp)
Specs;
Brodix IK180 64cc heads;
.030 over bore;
Full length headers;
11.3:1 comp ratio;
Intake 2X4 carbs (thinking about switching to MPFI)
i hear that 110 lobe separation is best for 383s; why is that?
thanks all
Specs;
Brodix IK180 64cc heads;
.030 over bore;
Full length headers;
11.3:1 comp ratio;
Intake 2X4 carbs (thinking about switching to MPFI)
i hear that 110 lobe separation is best for 383s; why is that?
thanks all
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Your problem with 11.3 is enough cam to get your dynamic compression down. You need at least 236 intake with a roller cam. I don't know much about flat tappet cams. But it might take something like advertised 284 to work
180 cc is very restrictive. 200 or 210 215 cc Darts work nice on small motors like a 383
180 cc is very restrictive. 200 or 210 215 cc Darts work nice on small motors like a 383
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
No set rule of thumb on what LSA is best for any engine most go with it because it seems to be popular/everyone esle does type thing.
Depends a lot on needs, driving idle vacuum powerband range etc.
Depends a lot on needs, driving idle vacuum powerband range etc.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I have a 112 SR 236/242 on my 383 and it is pretty nice with a 5 speed
It depends on your whole motor as to what lobe center works best. 110 and lower gives the motor lots of overlap and the race car idle. Miles per gallon goes down also.
I had bad detonation problems with a 232/238 SR cam
It depends on your whole motor as to what lobe center works best. 110 and lower gives the motor lots of overlap and the race car idle. Miles per gallon goes down also.
I had bad detonation problems with a 232/238 SR cam
Last edited by gkull; Nov 2, 2010 at 10:03 AM.
Drifting
Joined: Apr 2006
Posts: 1,911
Likes: 2
From: gold coast queensland
your compression ratio is quite high for the rest of your combo but i would go no further than crane 119611 from the powermax series. its a small base circle roller cam retrofit so you will have no clearance issues . its a 112 lobe centre so you will have no vacum issues and will put you right around the 450 hp mark with great torque. you will need a 3000 stall or similar if you are driving an auto and at least 355 gears but other than that you will be smiling all the way from light to light.
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Here is a Crane hydraulic roller that will do what you want. http://www.cranecams.com/product/car...detail&p=24188
The next smaller one would probably work too, but the DCR is a bit high. http://www.cranecams.com/product/car...detail&p=24192
The next smaller one would probably work too, but the DCR is a bit high. http://www.cranecams.com/product/car...detail&p=24192
Last edited by DRIVESHAFT; Nov 2, 2010 at 10:25 AM.
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
11:03 with an aluminum heads is really not that bad we have done some 1:05 engines and no issues with Pump gas.
In this link Ken built a 383 engine and used a HYD roller the specs are posted and I talked to him last week and said at 40 miles an hour he can rip the tires off his car.
http://forums.corvetteforum.com/c3-t...-my-383ci.html
In this link Ken built a 383 engine and used a HYD roller the specs are posted and I talked to him last week and said at 40 miles an hour he can rip the tires off his car.
http://forums.corvetteforum.com/c3-t...-my-383ci.html
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
I am running the Edelbrock signature series retro roller cam... 10.5:1 compression, 440tq at the rear wheels..
but i have fond out how important the heads are in all this, that is to say the valve train itself.... SPRINGS, RR's, and LIFTERS...... in my case in changing out the springs, rr's and lifters, it was a difference of at least 50+HP..... these small things became major problems for me.... just FYI.... dont want to see you fight the same gremlins as I did...
but i have fond out how important the heads are in all this, that is to say the valve train itself.... SPRINGS, RR's, and LIFTERS...... in my case in changing out the springs, rr's and lifters, it was a difference of at least 50+HP..... these small things became major problems for me.... just FYI.... dont want to see you fight the same gremlins as I did...
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Instructor
Joined: Feb 2007
Posts: 138
Likes: 2
From: Buies Creek NC
For my '81 Vette street car, I built my 385 (.040" over) out of an '86up roller block and used a Crane billet HR part# 109841. It's 234/242 @ .050" on a 112 LSA. I used an old set of 487 LT1 iron heads milled to 71cc with 2.05/1.60 valves and professionally ported. Compression is at 9.8:1 with flattop SRP's. Motor is in the car but not running yet. 200r4 trans and a 2800 converter. I'm rebuilding the rear with a new gear (3.73), bearings, and bushings. Should be on the road later this month.
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
i need some advice on choosing a good camshaft for a 383 build. The goal is in the mid 400s for power (not more then 480hp)
Specs;
Brodix IK180 64cc heads;
.030 over bore;
Full length headers;
11.3:1 comp ratio;
Intake 2X4 carbs (thinking about switching to MPFI)
i hear that 110 lobe separation is best for 383s; why is that?
thanks all
Specs;
Brodix IK180 64cc heads;
.030 over bore;
Full length headers;
11.3:1 comp ratio;
Intake 2X4 carbs (thinking about switching to MPFI)
i hear that 110 lobe separation is best for 383s; why is that?
thanks all
It would be a good idea to pour the chambers of your heads to find out what they really are!!
We poured a set of AFR's that were suppose to be 65CC and when we checked them they were actually 67.5 which worked out perfect for our build.
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 4,435
Likes: 9
From: Kalamazoo Mi
i will do that tonight
