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Spark knock issues

June 17 2017 at 9:17 PM
Jackie  (Login 64fdgal)

Response to Compression ratio question

After boreing my 390 block out .030 and installing scat 445 stroker kit and using C4AE-G iron heads, I figured my compression to be somewhere around 10.0-1 or maybe 10.5-1 not really sure, after doing a compression check and every hole had a little over 200psi compression, and by making the engine happy setting the timing @ 20*, the 1st problem I had was run on after shut down, and ofcourse heavy detonation on acceleration, after doing some controversial research, I topped my tank off with E85. The detonation stopped, and no more run on after shutdown, another advantage of E85 is the engine is running cooler, I did rejet my carb, I know there may be some negative issues with using E85, but I think the advantages out weighs the disadvantages

This message has been edited by 64fdgal on Jun 17, 2017 9:19 PM

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