butch70462

iam dumb when it comes to cams, looking at a custom grind one company says 108 seperation and one says a 106 what is different and how would it effect the way engine responds they both are real close on other spects
any input tks Butch

Hottarod

Read this;
Cam - Camshaft Specifications

Remember that the shape of the cam lobes also has an affect on this.

Copied from that in case you miss it;
If the Lobe Separation Angle is narrower: As a cam turns, one valve opens. As the cam continues to turn, that valve starts to close. Since the angle is narrower, the 2nd valve in the pair is beginning to open before the first one is closed. How far the first valve is open when the 2nd valve begins to open depends on the Cam Lobe Separation. (The shape of the cam lobe also effects this.) A narrow angle will increase cylinder pressure, make an engine idle worse and reduce idle vacuum. Cylinder pressure increases because after the exhaust stroke, the piston is pulling air into the cylinder. If the intake valve opens earlier, more air can be sucked into the cylinder.
If the Lobe Separation is Wider: As a cam turns, one valve opens. As the cam continues to turn, that valve starts to close. With a wider angle, the 2nd valve in the pair is starting to open later. With the right angle, you could time the first valve to be closed before the second one opens. With a wider separation angle, cylinder pressure is reduced, idle is smoother and idle vacuum is better.

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1965 289 mustang fastback

RickRacer

I've seen OTS cams with 107 to 114 and figure a 110 would be a good compromise. Even if the 107 or 108 makes for a great sounding cam....

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