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Rich, the vacuum boosters seem to be needed with the 427R ROUSH engines, not necessarily a SPF problem. And, apparently not all 427R engines ? and NOT the 402R engines . The cam in the 427R seems to cause low boost at low rpm's . Hence causing havoc with the power brake system as rpms decrease . This may be an isolated case not related to that , but others have reported the can as the fix with a 427R as my friend did. Bill
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