Re: Performance Lacking in a 383 Build.
 

Well damn, sorry for the issues you have had.
I have a 383 stroker i am going to run, with Edelbrook aluminum heads (same or close to the same as you), full roller Howards Cam, Lifters and Rockers but the cam is not an RV grind i called and got a cam grind built for the 383, Muncie 4-Speed and 3:42 posi rear.
I am interested to hear what the engine builder has to say. I built my engine, but had the machine work done a respectable outfit in town and then me and my anal build mind took a week of measuring, testing, and such to build it. I fortunately have alot of the tools to test the fitments, not saying i know what i am doing, only saying that if it is bad or not right, i can only blame myself.
I wish you all the luck possible and look forward to your excitement of how "Snapping" the torque monster has!!!

Re: Performance Lacking in a 383 Build.
 

No, it's actually a Jimmy. It's GMC's version of the Chevy Blazer.

I placed the 410 gears in it when I restored the vehicle last year.

I'm running 33's on them, and I did install a gear vendor overdrive unit.

Pat

Re: Performance Lacking in a 383 Build.
 

I'm hoping for information tomorrow! I'm curious to see if additional machining is going to be necessary.

Pat

Re: Performance Lacking in a 383 Build.
 

OK, I get it. I thought the gearing sounded low, but with a GV/OD it makes more sense. With 4.10s your focus is off road, and a personal choice.
With three broken piston rods we know why you had no power. You were actually running a pumped-up 5 cylinder.
Better luck on your rebuild.
My '71 Jimmy is a 350/SM465/NP205/12Bolt-3.73Posi/ 33x12.50x15.
Yours is pretty.

:gmc2:

Re: Performance Lacking in a 383 Build.
 

Seems that more than one company is or had problems with their pistons TRW paid for the rebuild for my 66. Mine was catastrophic though 3 others had cracks around the wrist pins.

Absolutely no noise prior to damage

Re: Performance Lacking in a 383 Build.
 

Well that stinks man! I always use good Forged pistons in my rebuilds.

Re: Performance Lacking in a 383 Build.
 

Well...motor needs to be bored .040 to clean up the cylinder walls.

Ordered forged SRP pistons and all new bearings. Hopefully it will run like it was supposed to when it's back together.

Re: Performance Lacking in a 383 Build.
 

Sounds like a good start.

Re: Performance Lacking in a 383 Build.
 

.040 over what was already bored? Do you trust your machine shop? Was it a stock bore when it was stroked? I'd hate to see you throw more money down the toilet.

Re: Performance Lacking in a 383 Build.
 

I'm sure that .040 includes the previous bore.

Re: Performance Lacking in a 383 Build.
 

That's what I took it to mean also.

Re: Performance Lacking in a 383 Build.
 

Yea, I should have stated that it's going to go to .040 over from stock, as it was already .030 over and he just wasn't able to save it.

This mechanic is actually very dependable, highly desirable, and very hard to get an engine in line.

Fortunately, I had an inside line.

Pat

Re: Performance Lacking in a 383 Build.
 

Thanks for the comments.

Probably highly unlikely it will see much off road use, I just want to be able to pull a car trailer, or a camp trailer periodically.

Thanks for the better luck wishes. I'm hoping for far better luck too!

Pat

Re: Performance Lacking in a 383 Build.
 

Wow, that's crazy! Sorry you had to go through similar issues too!

Pat

Re: Performance Lacking in a 383 Build.
 

Thanks Guys!