8 degree to 25 degree injector conversion for pre 2006 TC

loup1276 · #1 07-01-2008, 05:12 AM

I am currently in the process of completing my 95 in build. I have an 2003 Deuce and was wondering about upgrading the injectors from the 8 degree to 25 degree. I junderstand that the plugs are different and the 25 degree injectors are longer. What is needed to make this conversion work correctly or is it better to by an aftermarket injector that fits and plugs correctly to my current setup. Just a little background on the build the motor has ported polished heads, 620 lift gear driven cams and 11.5 to 1 comp. I am just trying to get the most out of the build my current manifold was milled and ported to match the heads so if possible I would like to use that one but I am open to having to have another milled and ported as well is its worth it to do so. Thanks in advance..

Buzzardbait · #2 07-01-2008, 07:17 AM

It also depends on what fuel management you are using.&nbsp\\; Ie, are there maps out there for your EFI system with the 95" mods, the 25 degree injectors etc.
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in any case, if you've done that much work to the motor,&nbsp\\;I would think that sticking with the 8 degree injectors is not a good idea, especially considering the way they've been shunned from even stock motors.
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Doc 1 · #3 07-01-2008, 07:28 AM

Your going to need some fuel in there at 11.5:1 compression. Your stock injector size is a 4.35 the&nbsp\\;25* injector is a smaller 3.91 injector. I would stay with the 4.35 injector as long as it has the updated version that is recognized by a white plastic band around the injector....the bad injectors had a brown band around them.&nbsp\\;