I've always found the SBFs to be a biatch to burp in my FFR. Mostly I think due to the radiator top laying down lower than the goose neck/filler. I installed petcocks at the rear end of the intake manifold to make burping easier. A friend who has a 289 in his TVR recommended the surgery. Works like a charm. I was amazed at how much air was trapped at the rear cooling channels. No crossover on the rear of this Edelbrock intake. The Tupperware air cleaner is a bit restrictive though.
