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help with change of compression effects

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Old Dec 27, 2024 | 01:04 PM
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learning101
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Default help with change of compression effects
Did the head and piston change on my 5.3 put flat top pistons on with 799 heads cut .030 off deck so I went from stock 9.5 to 10.5 could I still use regular gas 89 octane. and will this effect the computer?
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Old Dec 27, 2024 | 01:47 PM
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If it's 89 octane you should still be OK. Have you run it yet? If so, and no knocking, keep cruisin'!
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Old Dec 27, 2024 | 04:57 PM
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Don't know how you think it will Affect the computer. Stock tune it will run all day might get labor knock in some of the part throttle range, it's a matter of where the timing is.
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Old Dec 27, 2024 | 06:02 PM
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Wouldn’t hurt to get a datalog and see if you’re getting any knock retardant jumping up. I’ve learned the stock tune file is pretty safe overall but you’ll be losing power if it’s just pulling a ton of timing?
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Old Jan 6, 2025 | 06:40 AM
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And, what do the plugs look like?
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Old Jan 7, 2025 | 08:16 AM
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.030” out of the hole? Sure you’ll have enough quench?
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Old Jan 7, 2025 | 10:01 AM
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Originally Posted by grubinski
.030” out of the hole? Sure you’ll have enough quench?
had trouble starting it found out stock pushrods are too long and left my valves open so i ordered .375 and .350 push rods with taking .030 off the head so we will see o ordered a push rod checker just in case
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