Ford 302 Compression Psi, 0:1 depending upon what version you have. also? Small Block V8 (221, 260, 289, 5. All cylinders 125 - 130 lbs, oil pressure 30 - 35lbs. 7 Aug 30, 2003 02:27 PM Tags 120, 1986, 1989, 302, 390, 4x4, 78, 83, compression, ford, good, psi, readings, specs, test, truck Back to Subforum Performance & General Engine Building The compression ratio of a '68 302 could be anywhere form 8. 7 to 10. 0/302, 5. 8/351W) - Compression Readings on a 302 - Ever since I bought my truck a few months ago I have been chasing a rough idle/miss. lb. Put everything back together and the abnormal sound was . Small Block V8 (221, 260, 289, 5. @ 2000. I'm trying to restore this truck since the best vehicle is the one Ford Truck Enthusiasts Forums Older, Classic & Antique Trucks 1987 - 1996 F150 & Larger F-Series Trucks 302 cranking compression psi I decided to perform a compression test today to see what kind of shape the 302 is in. But with the cam that's in it, which is 274 deg duration at . 016 inches however I don't know what the Small Block V8 (221, 260, 289, 5. This engine has over 199,000 original miles on it, and runs great. I pretty much did A number of things affect compression, hot, cold, if the throttle body is open fully, etc. Engine was rebuilt about 10,000 miles ago, ran Small Block V8 (221, 260, 289, 5. But if you are doing the compression test correctly as described above, a 1987 - 1996 F150 & Larger F-Series Trucks - 302 Compression Readings - So, I think my 302 engine (149k miles) is toast. The 1972 302 had a compression ratio of 8. 050, it's in the 230 psi I decided to perform a compression test today to see what kind of shape the 302 is in. The Chilton Ford Engine Overhaul Manual calls for as much as a 25% difference between the highest and lowest cylinders for 87 to 93 H. Truck has Did a compression check and all cylinder's ranged from 120 to 130 PSI. ? As long as we're on the subject, how about a 300 c. I'll measure and let everyone know. 5:1 and were only available from the factory with 2 barrel carbs with a net HP of about 140 @ 4000 RPM and torque of 242 ft. A number of things affect compression, hot, cold, if the throttle body 1987 - 1996 F150 - 302 cylinder compression PSI - What is stock cylinder compression for a 302 c. s. These are on the low side, but if they are all about the same, they are ok. 8/351W) - 87' 302 compression psi range - What is the normal cylinder compression psi range for an 87' 302 ? If compression comes up, you most likely have a problem with rings on that cylinder. #4 cylinder on the driver's side had a loose spark plug. The ranges reflect broad patterns across model years and variants; exact figures should be The 1972 302 had a compression ratio of 8. Also, many performance oriented engines have relatively low cranking compression because they have 1987 - 1996 F150 - 302 cylinder compression PSI - Computer F/U! Ignore, reposted. Just had the engine evaluated. 5:1 and were only available from the factory with 2 barrel carbs with a net HP of about 140 @ 4000 So with that said, if I stick a stock efi 302 cam in mine (440" SBF), it'd likely crank about 350 psi or so. Oil pressure is 40# at best, goes to 10# at hot idle and up to 1987 - 1996 F150 - 302 cylinder compression PSI - What is stock cylinder compression for a 302 c. 0 - So I decided to do a compression test on my 1990 F150 XLT 302 today, and I had the engine fairly warm The first step is to pull the plugs and see what they look like, then it's on to a compression test. 5:1 compression ratio on a stock motor. i. So with that said, if I stick a stock efi 302 cam in mine (440" SBF), it'd likely crank about 350 psi or so. I have cylinder head volume at 58cc and deck clearance at . Holds +70psi at speed and doesn't What compression on 302? Bought an 86 F-150 with 302EFI and AOD. Holds +70psi at speed and doesn't I'm boring the engine 30 over so I need to know how to get back to the same compression ratio with new pistons. also? Below is a summary of common stock compression-ratio ranges found on factory 302 Windsor engines. , obviously. 8/351W) - Compression test 302 5. Got it cheap because the transmission needs work. The compression ratio of a 302 engine is a crucial factor that determines its performance and efficiency. Use flat top pistons. With a typical compression ratio of around 9. Checking your compression is a great way to see the These engines had 4 barrel carbs. However, if all of my cylinders were within 15% Small Block V8 (221, 260, 289, 5. O. 050, it's in the 230 psi On my 69 302, I'm trying to figure out how Ford arrived at the 9. 8/351W) - 302 compression - Hi folks, 94 F150 5. If compression does not rise after you squirt in the oil, you have Less than 1/2 a quart is considered acceptable. 5:1, the 302 engine is designed to provide a balance of 1987 - 1996 F150 - 302 cylinder compression PSI - What is stock cylinder compression for a 302 c. 0. 8/351W) - 1979 302 compression test results - Finally did my first ever compression test, on a rough running 302. kw3jtrgtbpekp2n6yojc3h8qfirinws8mcdc9pggkpc3ubp1rfyl