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Found 1 result

  1. thought i would write up the issue's I've had in the last few weeks with a mates cleveland and how we went about solving it, it may be useful to someone else. i put the engine together for him about 12months ago (maybe a little less), fairly simple combo but with a fair bit of compression. in the last couple of months with the hot days he had noticed it had been knocking/pinging from time to time under load and had started to run on upon shut down. the basic engine combo was 351 cleveland bored 20 thou 650street hp holley with a spacer (i think its 1") RPM Airgap Intake 2v CC heads with a bit of port & chamber work done (not sure what they flowed) and 4v exhaust valves Lunati 62503 cam 11.2:1 compression 6" rods balanced bottom end pacemaker 4>1 headers, twin 2.5" exhaust with Xpipe mallory ignition system toploader 9" 3.25:1 the car made 245rwkw on Lakeside Automotives Dyno we tried backing off the timing at first, it worked, but then the car wasn't performing as well, so we put the timing back to normal, and chucked octane booster in, that shut it up as a temp fix (btw car runs on BP Ultimate only) but we kept searching for things to try. put better leads on with less resistance, put a new coil on, new dizzy cap, then upped the jet size to try and cool the fuel down, which again worked, but then we had a slight stammer. next up was plugs, and i shit you not he's put at least half a dozen sets in in the last month to sort it out. different brands etc we dropped the heat range, again worked, but introduced fouling, changed brands, didn't work. i did a fair bit of research and called up NGK, got through to a tech who had a fair bit of experience working with older cars with cast iron heads. he recommended i look for another plug that had an unprojected tip, this removing a hot spot from the chamber. spent the next day at looking for plugs trying to find the right one, then ordered in a set of NGK B6FS plugs in, same heat range the car had before, which were the plugs lakeside put in. chucked them into his XC, and instantly the car ran perfect again. detonating was solved, no more run on. fixxed, simple. no fouling either which i thought might be an issue. i was tearing my hair out for about 3 weeks trying to sort this fuckin thing and all it needed was the right plug. on the flip side, it was nice to drive an XC again, even if it was someone elses.
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