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Just finished a new build and having loud valve train clacking noise. Specs: 4.1 block #291 0.040" over hyper pistons Turbo crank Two dot rods Champion ported iron heads, sprung for roller Ported intake Comp SK69-300-8 roller cam/lifters and chain w/stock cam tensioner spring HS 1.6 roller...

Hi all. I am working on a project with a mostly stock GN engine but being controlled with a Megasquirt ECU via MAP controlling the fuel injection and spark based on kPa and RPM. I need to import the GN ECU spark advance table. I have the GN ECU dump tables of spark based on LV8 and RPM. How do...

I am getting ready to swap out the springs in a 1987 normally-aspirated 231 (stock iron heads). I ordered some Comp #26981-12 Beehive springs, as well as the # 4693 spring locators. I understand you either have to machine down the valve guides for these locators to fit, or bore out the ID of the...

Hi all. I have a 1987(?) Buick "Regal" 231 in a Porsche 914. It is a street car only- not used for race or drag. Since it is a "classic" car and the area I live in, emissions are not a concern, and everything for that has been stripped off. The rods are aftermarket billet I believe (info from...

Hi all. I am quite familiar with engines, but never any experience with forced induction. I have a 1987(?) Buick "Regal" 231 in a Porsche 914. It is a street car only- not used for race or drag. The rods are billet aftermarket. The heads have been gasket-match ported and have been modified to...