madkaw

Take good care of that head if it’s really a MN head . Like said - a compression test would show pretty stout numbers with any combo involving a Maxima head . CC’s are about 39 which should show 180-200 psi compression check . I’ll also say the Maxima head would be about better than anything you could pit on that engine . But it also would be a challenge for stock EFI to keep up with the compression - not even talking ignition timing issues also .

I thought it was rubber soul version which might be larger . I’d like to run 75mm horns but might be limited to 50mm . I’ll be running 45 ITBS . I still have my custom air box I might run . thanks

Trying to find info on this cold air box . How tall of velocity’s fit under there ! I’m doing ITBS and contemplating stack heights thanks

Trying to find info on this cold air box . How tall of velocity’s fit under there ! I’m doing ITBS and contemplating stack heights thanks

Trying to find info on this cold air box . How tall of velocity’s fit under there ! I’m doing ITBS and contemplating stack heights thanks

Trying to find info on this cold air box . How tall of velocity’s fit under there ! I’m doing ITBS and contemplating stack heights thanks

I got it figured out . I found my old email address and was able to sign in as Madkaw

I run BPR6 - es11

View Advert L28 thermostat housings I have 2 clean housings with no pitting and good threads . 100$ each includes shipping sfinnerty1018@gmail.com Advertiser madkaw Date 01/23/2024 Price $100 Category Parts for Sale

Triple sure look cool but I don’t miss them - especially what you are going thru plus all the tuning .

Well this is the point where you need to decide whether to continue with the OEM EFI or go programmable . Yes the 123 ignition basically drops in with some wiring to adapt to factory wiring . It’s 600$ approx. You should watch a you tube video on it . Same amount of money would get you a basic programmable ECU like a Megasquirt . Then you would have full control of the engine with many options - ESPECIALLY if you want to modify your engine one day .

As said above - using MAP density tuning - KPA would be your measurement for load. Tuning for cruise would be difficult not knowing how the engine is loading . Loading can change a lot just climbing a slight grade though you aren’t putting much throttle to the engine . The OEM injection biases everything to the rich side to be safe . Those plugs took a while to look like that and most of the time we spend in cruise . That’s why the 123 ignition is a nice supplement to help keep the engine safe while tuning since it does have MAP sensor

What KPA is cruise running ?

Plugs can verify what you think is a proper tune . I’ve been running programmable EFI for years - those plugs look bad . Something is not right . 17’s would be terrible for an engine that doesn’t have full spark control. I run my engines lean - even my stroker and 15.5-16 is a lean burn for these old engineered engines . I appreciate your effort to make these old Bosch systems tunable - but without any load readings( I assume you use standard dizzy) you are guessing . i would recommend a 123 dizzy if you don’t already run one .

Those plugs show lean and or hot - I would be concerned if my plugs looked like that . I haven’t read your complete thread , but those do not look good