Umm, yeah, help me out here. I have a 544 cam and 1.7s. I want to run some edelbrock heads. am I safe with both the 1.90 intake or 2.02 intake size heads. And will a head gasket save the pv clearance at the cost of compression?
The ONLY way to know if you have enough p to v clearance (.080" intake/.100-.120" exhaust minimums) is to measure your set up with those heads. Each combo - even with identical parts - is different when it comes to those detailed dimensions. And the issue has nothing to do with peak lift --- and is very little effected by rocker ratio.
And no -- you don't want to run a thicker head gasket to increase clearance. Not only do you lose static CR, you ruin the quench dimension of the motor which can significantly reduce turbulence/air-fuel mixing in the chamber resulting in a detonation-prone engine.
Umm, yeah, help me out here. I have a 544 cam and 1.7s. I want to run some edelbrock heads. am I safe with both the 1.90 intake or 2.02 intake size heads. And will a head gasket save the pv clearance at the cost of compression?
Definately agree with Mr Yount...and I have been informed the 2.02 Eddy heads will not work with the stock pistons..you will need to use the 1.9 with that cam and the indicated rockers..even then you SHOULD check the clearance to see if there are any issues.
Google "quench" and you'll learn a bunch on your own.
It's the dimension between the flat part of the piston and the flat part of the head (not the chamber). Ideally it should be around .035-.040" on a steel rod engine that sees 6500 rpm or less. This dimension causes most of the air fuel mixture to be 'squished' into the chamber with great turbulence/mixing while the burn is at it's beginning. That turbulence/mixing staves off detonation and results in a more complete (more powerful) burn. When you put on a thicker head gasket and that distance starts to grow to .060-.080" you interfere with the 'quench' characteristics of the engine/chamber.