Cam application: x-cam or lunati

[TobyA-1]

I have the following:
1988 stock short block
edelbrock rpm performer intake
holley 600cfm 4 barrell
ford gt40 cast iron heads
stock exhaust manifolds
xpipe
single chamber mufflers

The car is for road racing.

Which cam best fits the setup?
xcam: 1.6 ratio setup
lift:.542, duration: 224, sep: 107int/117exh lift with 1.72 is .583

Lunati rrn1-213-218
1.6 ratio setup
lift: .477int/.500ex, duration:213int/218exh, sep:112° Sep 108° Int C/L
lift with 1.72 setup is .512int/.537exh.

I can run 1.6 or 1.72

Any suggestions will be greatly appretiated.

 

[90lxcoupe]

i'd go with the lunati

 

[TobyA-1]

with 1.6 rr or 1.72 rrs?
why the lunati?

 

[84blkstang]

ide go with the lunati also because your setup isnt big enough to require a cam the size of the X cam ......just a thought

 

[TobyA-1]

What about duration and lobe seperation....I cant find any info on this Lunati cam....even if it is obsolete. It appears to be a popular chevy size.

 

[thegum]

some guy gave me a cam and he said it was a 500...525...542.. 5something he said i needed to get 600 lift springs for it is that true?

 

[thegum]

i have an 1985 gt mustang roller motor

 

[TobyA-1]

You can check the distance between valve spring coils while the spring is compressed with a feeler gauge. To do this the cam has to be installed. Turn the engine using a ratchet or breaker bar on the crank. Turn the engine a full 2 rotations (720 degrees). IF THE ENGINE WON'T TURN DON'T FORCE IT!! Your probably bangin pistons and valves together.

If the engine turns you should be able to slide a feeler gauge thru a spring that is completely compressed. You should be able to a .01inch thru at least 2 or 3 of the coils.

You need to take the cam to a machine shop and get the lift, duration, and overlap specs. Or just look it up if it has a part or grind number on it.

If it is a big cam you will have to replace the springs.

Now back to my topic.

 

[TobyA-1]

any suggestions?

 

[TobyA-1]

I guess I am going to run the Lunati....any objections.