You can save a good 50lbs of that with a aloy intake also.

 

Not much at all considering that 125 lb cost gives you 109 extra cubes which in stock EFI form would be worth something like 50 HP.

50HP moves 125lbs very easily.

 

Who tuned your 393?

What system did you use?

 

Justin: what was the title of that "War & Peace" length Thread you did?

"Went to my local engine builders today..." or something like that.

You might post a link for the further edification of the masses. I read darn near the whole thing when I first came here. It was good pretty & interesting.

 

When I put my 351 and ZF transmission in the truck I lost about an inch in my front suspension due to weight over a 302/M5OD. I don't want to put another 125 lbs in the front of my truck. It's already very nose heavy.

If you do a search for my user name in the 302/351 engine forum you should find that thread.

 

Who tuned the 393?

 

Guy in NH....wasn't a tuning problem.

 

If detonation was an issue on an EFI stroker... the tuning is likely the culprit. The likelihood of a MAF unit puking or injectors not balanced is small but possible.

STFT's and LTFT's monitoring vs. %engine load would identify blatant issues. Injector width, MAF frequency issues, Short-Term Fuel trim can all make or break a well built motor. A data logger in your service port could monitor your sensors and help identify induction issues.

A wideband with gauge in your cluster to monitor A:F full time might prevent this in the future. No need to tater the next lower end you throw in that motor.

Take a look at the sct pro racer package if you are serious about that stroker. I think you'll find the tuning a lot less daunting than you previously thought (or at least I thought!). The support for the product both OEM and forums is incredible. Not to mention... a couple of tunes and some dyno time and the setup pays for itself.

You will also watch your rig a lot closer, monitor values more diligently than your average tuning shop. Not to mention... dial your rig for your style of driving... everyday street manners...not just WOT performance.

Just a thought... from someone who appears to be another DIY'er kind of guy.

Blurry94 is a member that is well versed in this field and helped me get started on my DIY tuning quest. Pick his brain if you have any in-depth questions. I bet he'd lean towards tuning/EFI issues for your previous detonation problem.

Good Luck,
Mike

 

Normally you are correct.

But I know that detonation wasn't part of a tuning issue regarding the EFI. It was the way it was built. I was being vague because I didn't want to really dive into it because it's a long story but it goes like this...


When I did it about 3 years ago I didn't know very much about it. I had a company build my shortblock and I wanted mild compression. He told me to use a thicker head gasket and I've learned you can't do that because the quench height is sacrificed. I had way too much of a quench height and it causes detonation. I had good A/F ratios, mild timing, and aluminum heads with only 9.5:1 compression and it still detonated unless I backed the timing off even more and had 93 in it. You could also hear how it wasn't burning the fuel correctly.

Thats why I pulled it out after only 5000k mi. I couldn't get it to run right w/o switch head gaskets and tweaking some other things that cost $$ and time I didn't have so I put a slightly modified 351 in it's place.

In the last 3 years I've really studied the process and learned quite a bit so I'm comfortable building them myself now...just don't have the money to build one.

The motor in my truck has about 200,000 miles on it. It still runs good but it leaks and I'm looking at picking up a better 351 and putting some of my performance parts on it. Won't cost much for over 300hp and very little vehicle downtime.