I have just fired the freshly rebuilt L48 in the '75 coupe. Internals are stock, with the exception* of a Comp Cams 151H grind, which is supposed to the a knock off of the 327 / 350 hp hydraulic. Fresh original Q jet is in place.
Idle set @ 850 RPM, Initial timing 10 btdc, warm motor, vac advance tied to constant vacuum port....
Lumpy idle, eratic speed, smells fat, 12-13" vacuum. Idle mixture screws are useless....I am assuming that at this vac level, the power valve is opening, thus the lack of idle mix control.
I can't tell if I am dealing with a massive vacuum leak, or another case of "bigger ain't better" in the cam department.
Duke, don't fuss at me, I am planning on working Sunday to get more info, but was looking for anyone else's experience with the 151H Comp Cam.
What is an expected vacuum level?
Help!
Thanks
Idle set @ 850 RPM, Initial timing 10 btdc, warm motor, vac advance tied to constant vacuum port....
Lumpy idle, eratic speed, smells fat, 12-13" vacuum. Idle mixture screws are useless....I am assuming that at this vac level, the power valve is opening, thus the lack of idle mix control.
I can't tell if I am dealing with a massive vacuum leak, or another case of "bigger ain't better" in the cam department.
Duke, don't fuss at me, I am planning on working Sunday to get more info, but was looking for anyone else's experience with the 151H Comp Cam.
What is an expected vacuum level?
Help!
Thanks
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