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[Conaski, didn’t want to hi jack the thread but you seem to be the man to talk to lol i have a 95 f150 supercab that im building a motor for as the original motor has 328,000 on it and burns a quart of oil a day! I was wondering if the sd system would run a 393 stroker if i upped the injectors to 24lb, did aftermarket heads and bbk throttle body along with small comp cam as theres very few sd friendly, ive had several people tell me that i could do it and it would run fine, i planned of getting a adjustable fuel reg to fine tune the mixture, what do you think?
I can tell you right now it ain't gonna work until the ECM is reprogrammed for the bigger displacement and mods.
That is about all the stock PCM would handle, change the cam and you will put it right over the edge. If the truck was MAF it would better adapt to these smaller scope upgrades but once you get beyond the supply limits of the stock injectors(275hp) tuning becomes mandatory.
A stroker motor with aftermarket heads and cam is way beyond what a stock 5.8 PCM can adapt to, but a 7.5 PCM might just run it decently as that motor used 24lb injectors
That is about all the stock PCM would handle, change the cam and you will put it right over the edge. If the truck was MAF it would better adapt to these smaller scope upgrades but once you get beyond the supply limits of the stock injectors(275hp) tuning becomes mandatory.
A stroker motor with aftermarket heads and cam is way beyond what a stock 5.8 PCM can adapt to, but a 7.5 PCM might just run it decently as that motor used 24lb injectors
do you think it would handle a set of heads with the stock cam in it with headers and just a bbk throttle body? im just looking to get some extra torque out of it, not looking to rev any higher than 4500-5000
Any suggestions you might have, the motor i have is a 96 junkyard block, so im gonna freshen it up, it had sone burnt oil on the plugs so i tore it down to rebuild before i swap it out. I had a 87sd mustang that i did a cecent amount of mods on and drivability was good, it was all in the cam , i had a comp cams sd cam in it just high lift short duration
Try advancing the ignition timing at the distributor- how about!?
I’m going to try this this summer with my 96 5.8:
Try advancing the ignition timing at the distributor by very incrementally turning it with the help of a timer light- how about!?
I don’t know what altitude your at but I’m at 6k feet and after talking to some others in another post they confirmed that these older systems didn’t fine tune the ignition spark advancement as precisely as newer vehicles.
Maybe we can get a few degrees advance from factory settings without just before engine knocking.
If so it should increase pulling power and mpg something that might be noticable.
You know, catching more of the downward force of the ignition, like getting that bicycle seat height just right for the length of our legs when we were kids.
do you think it would handle a set of heads with the stock cam in it with headers and just a bbk throttle body? im just looking to get some extra torque out of it, not looking to rev any higher than 4500-5000
That will work but don't waste your money on a throttle body, the stock one isn't even remotely close to being a bottleneck.
That will work but don't waste your money on a throttle body, the stock one isn't even remotely close to being a bottleneck.
i thought about gettin a set of sve heads for a lightning and use this cam from comp its just a tiny step up from stock and comp swears it will be fine with this combo do you think it’s worth the 329$ or just use some 1.7 roller rockers with stock cam to get a lil more lift and duration, the cam that was in there is in bad shape it’s scored up pretty bad fir being a roller cam lol
i thought about gettin a set of sve heads for a lightning and use this cam from comp its just a tiny step up from stock and comp swears it will be fine with this combo do you think it’s worth the 329$ or just use some 1.7 roller rockers with stock cam to get a lil more lift and duration, the cam that was in there is in bad shape it’s scored up pretty bad fir being a roller cam lol
The stock F4TE cam is just a tad less in duration and lift when run with 1.7 rockers. 256/266 duration, .445/.473 lift, 116 LSA.
At a glance that looks like the Comp 35-512-8, if so that is about as close as it gets to a stock replacement so should work well.
it won’t be too much fir the sd system to go .30 over,heads, that cam and headers, ya think? Im going to get an adjustable fuel reg so if i have to i can tweak the a/f ratio. Im used to building mustang motors and the sd truck systems have me lost as to what they’ll tolerate. You are correct, it is a 35-512-8 also
It's plain to me here, you'd better stick with EFI. Put an 850DP on a 351 and I can tell you you'll be sorely disappointed. The instant you nail the go pedal the first time, you'll be wondering why the engine died. You don't understand how a carburetor works.
why wouldn't a 850DP work? ive got a 77 f150 with a built 351 and it runs great.
why wouldn't a 850DP work? ive got a 77 f150 with a built 351 and it runs great.
Because the 850 is a mechanical secondary carb. And when you nail the go pedal at too low an rpm, the engine will fall flat on it's face. I've run one on a 390 and it was fine nailing the pedal at highway speeds, but not from a dead stop. The OP's 351 will not support that level of airflow..
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