jeremyshee01 Posted September 2, 2017 Report Share Posted September 2, 2017 Finally got my shee jetted pretty good (thanks to guys on here) but now I have a question on timing. I have a 4 mil 421 from vitos, bills pipes at the moment, 35's, open air box, v force 4, 93 pump, 22cc domes (not sure if u would need to know anything else). I'm at +4 now but had one reputable shop tell me I need to be at +6 and another reputable shop tell me to keep it at 4. Really don't wanna rebuild this thing, any input on what's best/what I need? Sent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 2, 2017 Author Report Share Posted September 2, 2017 Also don't really wanna pull the head if at all possibleSent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted September 2, 2017 Report Share Posted September 2, 2017 Keep it at 4 worth 93Sent from my SAMSUNG-SM-G891A using Tapatalk Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 2, 2017 Author Report Share Posted September 2, 2017 Ok will do man thanksSent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted September 2, 2017 Report Share Posted September 2, 2017 What's the compression on that thing? its a 68 bore correct? squish? Quote Link to comment Share on other sites More sharing options...
Ayesully810 Posted September 2, 2017 Report Share Posted September 2, 2017 If u were turning more rpms and compression like 170 psi with shearers then 6 would be good but with 140 150 psi and those pipes 4 is the spot. Sent from my LGMS210 using Tapatalk Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 2, 2017 Author Report Share Posted September 2, 2017 What's the compression on that thing? its a 68 bore correct? squish?Ya 68 boreSent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 2, 2017 Author Report Share Posted September 2, 2017 If u were turning more rpms and compression like 170 psi with shearers then 6 would be good but with 140 150 psi and those pipes 4 is the spot. Sent from my LGMS210 using Tapatalk150psiSent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 2, 2017 Author Report Share Posted September 2, 2017 See, vitos knowing all my mods said plus 4. Driveline knowing everything said plus 6Sent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 2, 2017 Author Report Share Posted September 2, 2017 But u guys never steered me wrong so far so I'll do what u guys suggest. Sent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Screaming Yellow Zonker Posted September 3, 2017 Report Share Posted September 3, 2017 If you were looking to extract every bit of power out of that motor and didn't care about having to rebuild after a few runs than higher timing is ok. but if you you are looking for longevity than lower timing is better for you. As stated above with your combo you will be happy with staying at 4*. I would rather ride back to my truck than get towed.... Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 3, 2017 Author Report Share Posted September 3, 2017 Lol me too man, gonna keep it at 4Sent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
TrickedCarbine01 Posted September 3, 2017 Report Share Posted September 3, 2017 +4 has proven to be a typically safe option. There are two areas to read the spark plug when checking if the motor is happy with current timing. Most will look at the strap near the 90* bend. A nice line seperating two colors indicates happy. Also look how far the soot is from the top of the center electrode. You want it nice and tight. If it's running clean up in to the plug beyond a millimeter (by eye, there are other precise ways to measure) a change is needed. Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
TrickedCarbine01 Posted September 3, 2017 Report Share Posted September 3, 2017 Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
jeremyshee01 Posted September 3, 2017 Author Report Share Posted September 3, 2017 Thanks tricked, this will help a lot in the future on jetting n timing my own shit. Will save a lot of timeSent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
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