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Re: 95 G30 Tow Project. [Re: Don_F] #748023
May 05th 2019 8:23 am
May 05th 2019 8:23 am
Joined: Apr 2016
Posts: 132
Oregon
D
Don_F Offline OP
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Don_F  Offline OP
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Joined: Apr 2016
Posts: 132
Oregon
The Jegs heads were originally advertised as having bronze guides and high lift springs. One I got had the high lift springs but no bronze guides. I was in a hurry so I painted it and stuck it on. The second one was the same casting but from a different manufacture. It was damaged. I asked Jegs to send me one that at least had the high lift springs like the first. They had just switched suppliers. No bronze guides as advertised, no high lift spring. A stock Vortec cam would be very close to coil bind. Very sloppy machine work. I asked if I could return, but they would only take the one that had not been installed. My fault, check both heads before painting or bolting anything on. I ended up removing the installed head and installing a new set of springs and retainers on both to get the proper lift clearance. With these heads the castings are pretty good, thick casting so there should be no worry about cracks like with GM heads, its just the machine work is super sloppy. The last version of the vortec heads from GM are a hit or miss too. Some say the castings are revised without notice and the exhaust ports are raised compared to the bolts. This causes standard exhaust manifolds to block off part of the port unless you grind out some of the roof. Jegs was worthless, they would not even remove the bronze guide description in their ad. After I harped on them for a month they finally took one apart and then suddenly the ad was changed.

Last edited by Don_F; May 05th 2019 8:24 am.
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Re: 95 G30 Tow Project. [Re: Don_F] #748024
May 05th 2019 8:44 am
May 05th 2019 8:44 am
Joined: Nov 2013
Posts: 3,461
Michigan
Dyno_Dave Offline
pooh-bah
Dyno_Dave  Offline
pooh-bah
Joined: Nov 2013
Posts: 3,461
Michigan
Thanks for the details Don. I have no agenda, I just wanted to know facts from someone who's been there and done that.

Re: 95 G30 Tow Project. [Re: Don_F] #750408
July 08th 2019 7:18 pm
July 08th 2019 7:18 pm
Joined: Apr 2016
Posts: 132
Oregon
D
Don_F Offline OP
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Don_F  Offline OP
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Joined: Apr 2016
Posts: 132
Oregon
I gave the van a real towing test a few months ago. I got called to tow the dyno to a small town in middle Oregon. Only about 80 miles each way but its in old volcano areas. The highway is straight up and down. The engine torque from the upgrades is noticeable it did fine. I went over the truck scales at very close to 10,000 lbs total. The problem was the trans temp. I had to let off on the steepest parts as the temps were going to cook the trans. I had the factory trans cooler as an option. One person told me there is a bypass built in and its a poor design. After many miles the bypass tubes work better than the other tubes and not much cooling gets done. I sourced another cooler from TruCool. They made the original too, but this one is twice as thick and has no bypass so it all has to go through the cooler. B&M Supercoolers are re boxed Tru-Cool coolers. I went with the Tru-cool box since it was less than half price. It was pretty easy. Since the same manufacture one side of the bracket was perfect, the other side needed a square piece of sheet metal. I had to trim the grill a bit from the backside because of the extra thickness. I have not pushed the trans that hard locally but it seems to cool better. There is one area where the factory add on trans cooler line has a necked down area to slide into the main cooler line. I think that may hurt cooling as well. I have not cut that out yet but will if trans temp continues to be a problem

[Linked Image]

Re: 95 G30 Tow Project. [Re: Don_F] #750409
July 08th 2019 7:26 pm
July 08th 2019 7:26 pm
Joined: Jan 2014
Posts: 597
Staunton, VA
kursed Offline
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kursed  Offline
addict
Joined: Jan 2014
Posts: 597
Staunton, VA
Lookin' good! cheers


[Linked Image]
Re: 95 G30 Tow Project. [Re: Don_F] #750702
July 17th 2019 9:42 am
July 17th 2019 9:42 am
Joined: Apr 2016
Posts: 132
Oregon
D
Don_F Offline OP
member
Don_F  Offline OP
member
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Joined: Apr 2016
Posts: 132
Oregon
I set up the dyno in my driveway on Sunday. Just to fine tune the fuel tables a bit. My neighbors are mostly nice about it as long as I don't do it too often. The second picture is last years beginning pull with an open air cleaner and the under drive pulley. Compared to the Vortec head swap, tiny 196 duration roller cam, and better exhaust system. It still uses the TBI and the stock exhaust manifolds. Its still a truck engine, it runs out of breath about 4000 rpm but the huge increase in torque over the stock engine helps a lot when pulling 10,000 lbs of van, trailer and dyno around. There is some differences between the runs, In the last runs I locked the converter early and locked it in gear to prevent the converter from locking mid run. I also used a mathematical ratio to figure rpm and its slightly off. Its not a big deal, but its a difference when comparing the two. Mostly the runs where to dial in the fuel table, for that you just need load and a wideband. The runs were just for information at the end of the work.

[Linked Image]
[Linked Image]

Last edited by Don_F; July 17th 2019 9:43 am.
Re: 95 G30 Tow Project. [Re: Don_F] #750768
July 20th 2019 9:13 am
July 20th 2019 9:13 am
Joined: Jan 2014
Posts: 597
Staunton, VA
kursed Offline
addict
kursed  Offline
addict
Joined: Jan 2014
Posts: 597
Staunton, VA
Definitely a healthier pull. Awesome work man.


[Linked Image]
Re: 95 G30 Tow Project. [Re: Don_F] #750791
July 20th 2019 7:18 pm
July 20th 2019 7:18 pm
Joined: Nov 2013
Posts: 3,461
Michigan
Dyno_Dave Offline
pooh-bah
Dyno_Dave  Offline
pooh-bah
Joined: Nov 2013
Posts: 3,461
Michigan
Looks great Don! Nice work. Wish you were here in Michigan...I'd set you loose on the TBI 305 (L03) in my Trans Am.

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