1981 Corvette with a 496 Bradenton, Florida 34203 Cam & Intake upgrade ???
05-30-2011, 09:34 PM
#1
Le Mans Master
Thread Starter
1981 Corvette with a 496 Bradenton, Florida 34203 Cam & Intake upgrade ???
Hi guys a couple of months ago we got this 81 Vette from Bradenton, Florida 34203 area. It has been working great but my friend wants to know what cam does it have now. The original owner does not have the information so we are seeking for help or maybe it does not matter which cam does it have now but its more important to know what can we put inside to create even more power.
What it does have now :
Engine 454 four bolt main block
Eagle stroker kit ---> 496ci
Eagle 4150 steel crank 4.250 stroke 4.310 bore,
6.385 H beam rods,
J&E dome pistons 18cc. It is
10.5-1 compression
Edelbrock RPM performer rect port heads
Victor Jr. air gap intake
These have been ported to match the intake runners.
BG 850 Mighty Demon (no choke)
Comp cams solid roller (not sure which one ? )
Jet-Hot coated Hooker super comp 2 1/8”
SS magnaflow mufflers.
We are maybe shooting for a intake , carb and cam upgrade
All advices are welcome ! Thanks !
What it does have now :
Engine 454 four bolt main block
Eagle stroker kit ---> 496ci
Eagle 4150 steel crank 4.250 stroke 4.310 bore,
6.385 H beam rods,
J&E dome pistons 18cc. It is
10.5-1 compression
Edelbrock RPM performer rect port heads
Victor Jr. air gap intake
These have been ported to match the intake runners.
BG 850 Mighty Demon (no choke)
Comp cams solid roller (not sure which one ? )
Jet-Hot coated Hooker super comp 2 1/8”
SS magnaflow mufflers.
We are maybe shooting for a intake , carb and cam upgrade
All advices are welcome ! Thanks !
Last edited by Calderone; 05-30-2011 at 10:20 PM.
05-31-2011, 12:42 PM
#2
If you measure the current cam's lift, duration, etc, you can contact competiton cams and they will tell you where you can go from here as far as the cam is concerned. You already have an 850 and a Victor so the only place to go would be a Holley Dominator and matching manifold.
05-31-2011, 01:39 PM
#4
Le Mans Master
Thread Starter
If you measure the current cam's lift, duration, etc, you can contact competiton cams and they will tell you where you can go from here as far as the cam is concerned. You already have an 850 and a Victor so the only place to go would be a Holley Dominator and matching manifold.
A holley dominator and manifold would be a good upgrade ?
Is it worth it , how much power ?
Thanks
05-31-2011, 01:40 PM
#5
Le Mans Master
Thread Starter
05-31-2011, 02:32 PM
#6
You already have a highly modified engine but you still want more power. The only way to accomplish that is to get more air and fuel into and exhaust out of the engine. The limiting factors at the moment would be cam and the carburetor/intake. Find out what cam you have and then you can decide how much more radical you can go and whether a more radical cam can handle going to a larger carburetor/intake. The other things you can do are nitros, supercharger, or turbocharger. You then have to decide whether the transmission, rear end, axles, etc. can handle additional power.
05-31-2011, 02:36 PM
#7
Le Mans Master
Thread Starter
You already have a highly modified engine but you still want more power. The only way to accomplish that is to get more air and fuel into and exhaust out of the engine. The limiting factors at the moment would be cam and the carburetor/intake. Find out what cam you have and then you can decide how much more radical you can go and whether a more radical cam can handle going to a larger carburetor/intake. The other things you can do are nitros, supercharger, or turbocharger. You then have to decide whether the transmission, rear end, axles, etc. can handle additional power.
It's never enough for him. We have no idea what cam is in there.
The original owner is not reachable for now,and yes i was thinking on this ...cam/intake/carb. Next step or easier would be to slap a nitro there.We have a TKO Transmission good for 650 hp but the rear end is the weak link but we are working , deciding on getting the parts.
Thank you !
05-31-2011, 02:56 PM
#8
Drifting
The carb & intake will be hard to improve on just by buying new parts. The intake could be improved by porting.
Its hard to comment on the cam, since you dont know what you have.
One area where then engine could probably be improved is the heads.
The Performer RPM heads dont flow all that well compared to other aftermarket heads of similar size.
Its hard to comment on the cam, since you dont know what you have.
One area where then engine could probably be improved is the heads.
The Performer RPM heads dont flow all that well compared to other aftermarket heads of similar size.
05-31-2011, 03:02 PM
#9
Le Mans Master
Thread Starter
The carb & intake will be hard to improve on just by buying new parts. The intake could be improved by porting.
Its hard to comment on the cam, since you dont know what you have.
One area where then engine could probably be improved is the heads.
The Performer RPM heads dont flow all that well compared to other aftermarket heads of similar size.
Its hard to comment on the cam, since you dont know what you have.
One area where then engine could probably be improved is the heads.
The Performer RPM heads dont flow all that well compared to other aftermarket heads of similar size.
i thought intake/carb could make 30-40 extra ponies if much....
A set of AFR Heads would be GREAT for this one, let's see what my friend says ...
06-01-2011, 10:45 AM
#12
Team Owner
You think someone would build a motor like that and put in some 'clunky' cam??? I don't think so. If you want "more power", add nitrous....and blow the sucker up....
06-01-2011, 11:30 AM
#14
Team Owner
As mentioned above, a degree wheel, a dial indicator and some elbow grease can figure that all out.
06-01-2011, 02:13 PM
#15
Burning Brakes
06-01-2011, 05:59 PM
#16
Team Owner
At the race shop we go through this from time to time because of clients acquiring old race cars with unknown parts. All it takes is a degree wheel on the damper and a dial indicator.
Measure how much lash I&E has. Put the motor on TDC on #1 the indicator should be within a couple of degrees. You rotate the motor until the pushrod side of the rocker has .050 lift then mark the degree wheel or write down that number. Continue to rotate the motor and write down the max lift numer and then back to the .050 lift number and write down the spot on the degree wheel.
You might end up with a lobe lift of .400 inches. then you multiply by 1.7 and you have a .640 lift cam and the .050 number might be 250 degrees at .050 intake and 256 exhaust.
Then just figure out a cam with more duration and lift.
Measure how much lash I&E has. Put the motor on TDC on #1 the indicator should be within a couple of degrees. You rotate the motor until the pushrod side of the rocker has .050 lift then mark the degree wheel or write down that number. Continue to rotate the motor and write down the max lift numer and then back to the .050 lift number and write down the spot on the degree wheel.
You might end up with a lobe lift of .400 inches. then you multiply by 1.7 and you have a .640 lift cam and the .050 number might be 250 degrees at .050 intake and 256 exhaust.
Then just figure out a cam with more duration and lift.
