383 SBC

[WS6]

So, I have a pension for older vehicles. And one that I have is my tow vehicle. A 1997 GMC K2500. It sure isn't pretty, but I have always thought GM did a nice job with the GMT400 series of trucks. this is my second one and even sold my '03 2500HD crew cab and went back to the OBS truck style.

One thing I didn't miss was the lack luster performance of the 5.7 Vortec, I mean after having a 6.0 in the '03 and one in the Denali, there is a night and day difference.

So the '97 has developed a cold start knock and I took the occasion to get an unfinished project motor off craigslist and tear it down and go through it again and do some mods. So this is one of the engines I did over this long winter.

Here it is...all done

It's now a 383 stroker vortec with eagle crank ,stock rods, speed pro coated skirt pistons small base circle 212/218 .494 lift roller cam. Upgraded injector spider, worked over vortec heads with screw in studs and LT1 valve springs.

I'm hoping it will wake the truck up enough to rival the Denali's pulling ability.

..

 

[Jan Larsson]

Nice one Rich !

 

[robert lee]

Cool beans, btw my '01 GMC has had a cold start knock for the last 10 yrs.

 

[jarredsoon]

Lookin good, I love the torque out if a 383

 

[WS6]

Yeah, my 03 6.0 had a cold start knock, but this is different, like ball peen hammer on cast iron ring knock.

 

[robert lee]

Yeah, my 03 6.0 had a cold start knock, but this is different, like ball peen hammer on cast iron ring knock.

It's all good , i plan on replaceing my eng. but not till it die's.. and so far it' still kikin' ... knock on wood.

 

[TTA976]

Nice project! Looking good Rich.

Joe

 

[nomrlz]

should be a nice tow beast. the vortec heads flow well and that stroke will give it some nice grunt. :headbang:

 

[WS6]

Well, it's in and running and has about 20 miles on it. Runs great so far but it has a cold start idle problem and I think it's leaning out past 4000 RPMs.
All though I did the famous 0411 PCM (think LS1) swap for the old OBDII black box PCM and had a 2002 Express van tuned flashed on it. It still thinks it's a stock cammed 350 vortec. and this 383 has a bit more compression and a bigger cam profile.
So I sent off the 0411 to PCMforless for a custom tune to be put on it.