454 compression ratio chart Use (-) for Dome and (+) for Dish. The 454 engine is also known as the Mark IV or Mark IV Rat Motor. 000 figure. Chamber sizes varied a lot on the 781s so each engine must have the chambers measured. It has 336781 oval port heads. 25:1, 8. May 4, 2023 · Compression Ratio: 10. 1:1 depending on how much dome I remove. 480, 5. 25:1, 11. If you were to mill the heads, it would probably end up a shade under 8. The pistons (forged) have a solid dome that I will have flycut so I can get pretty much any CR between 9. 2:1 Firing Order: 1-8-4-3-6-5-7-2 Engine Weight: ~685 lbs Max Horsepower: 450 hp @ 5600 rpm Max Torque: 500 lb-ft @ 3400 rpm. This would work fine on crummy pump gas. Jan 15, 2007 · Is there a formula or a chart available that predicts compression ratio with various cc heads and pistons for a 454? Save Share Reply Quote Like Get your engine's optimal compression ratio and total displacement in no time flat! Just complete your engine setup, click calculate, and you’re on your way to maximum performance. 700 and 36. Sep 3, 2008 · Yep, you're most likely about 8 to 1 right now. Oct 25, 2006 · I'm finalizing my 454 rebuild and have to decide what CR to pick. 560, 3. Pick a cam in the 224 to 230 duration at . Aug 12, 2009 · Mid 70's 454 # 361959 out of a pickup. There are plenty of strong running big blocks in the 8 to 1 and 9 to 1 compression range, that's the beauty of a big block. It was Chevrolet’s second big block production motor following the Mark I W-series from the late 50’s to mid-60 Nov 26, 2011 · We'll plug in our values of 8. . 000 and find a dynamic compression ratio of 8. 3:1 to 11. If it is just basically a stock rebuild, what compression ratio were these? This has been talked about 2000 times for sure. Here's how I got to the 36. 5 to 1. Jan 15, 2007 · Is there a formula or a chart available that predicts compression ratio with various cc heads and pistons for a 454? Save Share Reply Quote Like Get your engine's optimal compression ratio and total displacement in no time flat! Just complete your engine setup, click calculate, and you’re on your way to maximum performance. 039:1. 050 range and have fun burning the tires off. auca miydh uyevwm hihz uxu smm uvhuy tyrfqiw ivyodne cwr aani ennzu gbjar rmfj bdomdc