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FE Power Forums => FE Technical Forum => Topic started by: jimeast on September 28, 2015, 08:32:23 AM

Title: For Jay: Questions: The Great Intake Comparo
Post by: jimeast on September 28, 2015, 08:32:23 AM

Jay, I have the book, extremely helpful.

I have a 390 stroker  to build and a 427 block that will be built after the 390.  I'm curious about the idling conditions and street-ability of the 390 stroker and 427 (non-stroker) dyno mules you built.  I suspect the cams you used are a little too aggressive for most street rides, but thought I'd ask.  And if you have any data, I'd be curious about the general vacuum conditions these two dyno mules delivered.

Title: Re: For Jay: Questions: The Great Intake Comparo
Post by: jayb on September 28, 2015, 08:44:51 AM

I don't have vacuum data on those engines, but with the cams used in them you can figure that the vacuum would probably not be enough for power brakes; you'd have to have an auxiliary vacuum source if you need the vacuum for power brakes.  As far as streetability, I think that is pretty subjective.  To me they are both easily streetable, but not everyone would agree.  They both idle right around 1000 RPM, and you'd want a 3500 stall converter to run them on the street (or a stick). 

I think you could take either one of those engines and convert them to a milder hydraulic roller, and get the vacuum up where you want it for power brakes while maintaining or increasing horsepower on the 390 stroker engine, and probably not losing a whole lot on the 427.