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#1
01-29-2004, 01:23 PM
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Installed SSBC front power disc brake conversion kit on my 66 Lemans a year ago. Running a 428 with Ram Air IV cam, max. vacuum am getting is 12".
Brakes stop fair at low speeds, but if hard braking (panick stop) not real good. Have gone over and bled numerous times,added vacuum tank and changed master cyl with minimal results. SSBC advised I needed 18" vac. to work with thier booster and said I have too much cam? Don't understand how the Ram Air IV Cam would be a problem since many factory power brake Goats with this cam were produced. Anyone have and suggustions,don't want to add a pump if I don't have to. |
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#2
01-29-2004, 01:23 PM
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Installed SSBC front power disc brake conversion kit on my 66 Lemans a year ago. Running a 428 with Ram Air IV cam, max. vacuum am getting is 12".
Brakes stop fair at low speeds, but if hard braking (panick stop) not real good. Have gone over and bled numerous times,added vacuum tank and changed master cyl with minimal results. SSBC advised I needed 18" vac. to work with thier booster and said I have too much cam? Don't understand how the Ram Air IV Cam would be a problem since many factory power brake Goats with this cam were produced. Anyone have and suggustions,don't want to add a pump if I don't have to. |
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#3
01-29-2004, 02:01 PM
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__________________
 frittering and wasting the hours in an off hand way.... 1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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#4
01-29-2004, 04:16 PM
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Same cam and vacumm problem here. I added a Comp Cams vacuum cannister ($50), which helps a lot. Beyond that you will have to add a vacumm pump from pick-a-part or Master Power Brakes.
Les 66 GTO Coupe,455/trips,700r/2500stall,12bolt/3.08,1.79/13.01/104.5 68 GP daily driver and 2004 Route 66 Tour participant under restoration -------------------------- Better lucky than good
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Les Iden ---------------------------- '65 Buick Sport Wagon Custom, 340, T350, 3:23 '66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16) '68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold) '72 TA tribute/461, T400, 3.08, (Russ's as of 9-16) '97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed '09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins |
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#5
01-29-2004, 06:17 PM
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Another alternative is to swap out to a '78-'87 A/G-Body dual diaphragm booster. They work great with as little as 10 inches of vacuum.
TIGER EFI - Electronic Fuel Injection for the Traditional Pontiac Engine. bill@tigerefi.com The point to life isn't necessarilly the decimal.
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Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same. -RONALD REAGAN 462 cid/ 6x-4/ TH400/ 3.36:1/ 28x10.5/ 3880#/ 12.35 @ 109.36/ 1.69 60 ft/ 4 wheel disc brakes/ 15 mpg  |
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#6
01-30-2004, 09:09 AM
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David
Did't use Rhodes lifters due to the noise problems with them. I did use anti-pump ups recommended and supplied by Melling when I bought the cam. |
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#7
01-30-2004, 09:44 AM
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You could also use an hydraulic brake booster, runs off your PS (must be in good shape), it will improve your braking and get rid off your vacuum problems. Alot of the pro-touring people use them. Down side is of course price. See www.hydroboost.com
'I got a chevy with a mopar cam'
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