possum Posted March 20, 2012 Report Share Posted March 20, 2012 I have a 198 128 ported 350. Im wanting to drop in a 4 mil crank if possible. I know my durations will change. So im wondering how far they will change and will it run? Quote Link to comment Share on other sites More sharing options...
Nightmare Posted March 20, 2012 Report Share Posted March 20, 2012 what do the 198 and 128 #'s mean? are those port timings Quote Link to comment Share on other sites More sharing options...
possum Posted March 20, 2012 Author Report Share Posted March 20, 2012 Yup port timings they are. I thought u guys would just figure. Quote Link to comment Share on other sites More sharing options...
Nightmare Posted March 20, 2012 Report Share Posted March 20, 2012 i thought so, makes me wonder what mine are, oh well . ive been thinking of dropping a 4 into mine, according to the guy that built it its drag ported Quote Link to comment Share on other sites More sharing options...
camatv Posted March 20, 2012 Report Share Posted March 20, 2012 ok then back on track you need to know what crank your going to use. IF you do a pop up piston IT MIGHT WORK. any builder worth a shit can tell you if they will work or not if you measure your top down exhaust and transfers i can even run them and see what you end up with.. most times the transfers may jump to 132 ish and the exhaust may bump to just under 200. with a lil fiddlin with base gasket thickness you might get them to work. if noone else wants to help do some measurin and let me know. Quote Link to comment Share on other sites More sharing options...
blowit Posted March 22, 2012 Report Share Posted March 22, 2012 I would personally advise against it unless you wanna go for broke and weigh 40lbs. I would have to do more with the exhaust and still super tight and end up with a razor for a power band due to the change in xfer due to the crank change. I would personally recommend a different set of cylinders for that build. However, if you are stuck on them, we have, in the past, machined the bottom of cylinders to cheat this and custom machine the head to work. This was before Cubs were the rage though. You can get to that point of diminishing returns. Mull Engineering Quote Link to comment Share on other sites More sharing options...
possum Posted March 22, 2012 Author Report Share Posted March 22, 2012 Yea i figured my options were slim with these cyls. I might just leave it cause it runs REALLY good. Then maybe get a whole motor setup like a 4 or 10 mil cheetah will do just right.lol Quote Link to comment Share on other sites More sharing options...
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