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1987 G20 Gypsy
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Re: 1987 G20 Gypsy
1983 G20 Van #812585 April 22nd 2024 7:07 am
Joined: Apr 2007
Posts: 314
Likes: 72
1
G Van Man
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G Van Man
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I found a mistake I made on this build and just finished correcting it. Somehow managed to get a flexplate for an internally balanced 1-piece rear main seal SBC. I did not even realize that was a thing and somehow missed the missing counterweight when I installed the flexplate prior to dropping in the engine. The missing counterweight was the source of vibration I have been trying to track down at 2,000-3,000 rpm. Silky smooth now. I supported the engine oil pan with a floor jack, pulled the carrier bearing mount, then swapped 4 of the transmission bellhousing bolts for ~4" long bolts, unbolted the other 2 bolts and the transmission mount bolt from the crossmember, pushed it back and had it changed out in a couple of hours.

[Linked Image]

Last edited by 1983 G20 Van; April 22nd 2024 7:10 am.

1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
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Re: 1987 G20 Gypsy
1983 G20 Van #812602 April 22nd 2024 4:25 pm
Joined: Jul 2019
Posts: 11,619
Likes: 455
S
Maniac
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S
Joined: Jul 2019
Posts: 11,619
Likes: 455
Dude. Your skills are impressive.

Last edited by SDMickey; April 22nd 2024 4:25 pm.
1 member likes this: 1983 G20 Van
Re: 1987 G20 Gypsy
1983 G20 Van #812607 April 22nd 2024 7:47 pm
Joined: Apr 2007
Posts: 314
Likes: 72
1
G Van Man
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G Van Man
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Drove it around for a couple hours today. Got warm this afternoon here. With the ac on and the added engine and engine compartment heat it was a little more doggy than it was last night in the 40ish degree air. Only ran up about 58-59% injector duty cycle. Every engine I have ever had hates heat, lol. Still though I was playing around I can launch it hard now. Bring it up on the converter, walk it out and give it full throttle. 0-60 was about 6 seconds even heat soaked with the ac on. I screen captured it this time and it recorded the engine audio in the background. In running all over, found one small problem. The nut on the small wire that energizes the starter solenoid backed off and it would not crank. Easy fix.

But yea it screams for being a small block van especially considering the lack of gearing with the TH400s 2.48:1 first gear and the 3.08 rear end gear. The little L31 350 is making good torque. Which I knew it would from the start of this rebuild. The TBI small block air cleaner, paper element and ducting is building 1 in/hg manifold vacuum in the engine thus restricting it a bit. Has more in it for sure if I can find the 454 ducting and swap over the 454 air cleaner.

https://youtu.be/UjEKGehu1M8?si=a0xami_d6BgbVEGj

Last edited by 1983 G20 Van; April 22nd 2024 8:00 pm.

1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: 1987 G20 Gypsy
1983 G20 Van #812631 April 23rd 2024 1:35 pm
Joined: Apr 2007
Posts: 314
Likes: 72
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G Van Man
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G Van Man
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Next up, I need to work on the induction side at some point. The SBC TBI air cleaner and ducting is a 1.6 in/hg restriction at the TH400s ~5,700 rpm WOT 1-2 shift point thus costing a bit of power. I calculated that from the key on, engine off MAP reading vs the MAP reading at WOT. -0.6 in/hg vs -2.2 in/hg.

[Linked Image]

[Linked Image]

Last edited by 1983 G20 Van; April 23rd 2024 1:36 pm.

1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: 1987 G20 Gypsy
1983 G20 Van #812643 April 23rd 2024 7:30 pm
Joined: Apr 2007
Posts: 314
Likes: 72
1
G Van Man
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G Van Man
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Joined: Apr 2007
Posts: 314
Likes: 72
Drove it around more. Cruising 65 mph is effortless and rolled on it to pass, 85 mph comes up quick.

https://youtu.be/BjKfFEwvVKA?si=5IrkXVryDNc26O0h


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: 1987 G20 Gypsy
1983 G20 Van #812645 April 23rd 2024 8:59 pm
Joined: Apr 2007
Posts: 314
Likes: 72
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G Van Man
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G Van Man
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Joined: Apr 2007
Posts: 314
Likes: 72
Since I finished up the engine work, wiring harness, header install and exhaust work, the engine cover went on and I have been driving it the last 2 days everywhere I go. Runs and drives nicely although I need to mess with the TH400 governor a bit as it is shifting a bit too late as mentioned before. I thought it was ok at part throttle but it is shifting a bit late there too although holding the gear a little longer certainly helps it feel punchy. The a/c cools quickly and gets cold, especially cruising down the highway. It will get down to ~30F out of the center vents at highway speed. After the initial cool down, the 2nd fan speed notch is enough to stay cool in these sunny 75-80F humid days we are having. That was idling around town. My exhaust shop guy is squeezing it in to fabricate 2.5" tail pipes and weld up the system tomorrow at 9:00 AM and then it will be going to get an alignment after that by someone who was recomeended by a buddy that aligns all his old GMs. I also set the cruise control rolling 65 mph, took my foot of the go pedal, and it held 65 mph until I had to tap on the brakes a few miles down the road to slow down. Luckily it does not seem like it has a bad surge to it as it modulates the throttle that sometimes happens with these older vacuum cruise setups when you add a lot of power. The way I set the linkage up to limit the cruise controls ability to open the throttle more than 50% really seems to work well preventing the oscillation I have experienced before when they move the throttle plate too aggressively. Since it is cruising at 15-20% throttle at highway speeds, it has plenty of reserve opening it can achieve to climb grades or use the accelerate or tap up button to increase speed.

[Linked Image]

Last edited by 1983 G20 Van; April 23rd 2024 9:22 pm.

1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: 1987 G20 Gypsy
1983 G20 Van #812652 April 24th 2024 1:56 pm
Joined: Apr 2007
Posts: 314
Likes: 72
1
G Van Man
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G Van Man
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Joined: Apr 2007
Posts: 314
Likes: 72
We were able to get mandrel bent dual 2.5" over the axle. Cut up a pair of mandrel bent tailpipes for a GM A-body and made them work. Had to shorten them a bit, cut some sections with the bends at the wrong angles out, flare the pipe and weld. Took a couple of hours with the two of us working on it. All the differemce in the world in interior sound.

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]


https://youtu.be/AP9oFP9kMyk?si=YZKiPhtKxSUXDUfg


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: 1987 G20 Gypsy
1983 G20 Van #812653 April 24th 2024 3:34 pm
Joined: Dec 2023
Posts: 1,136
Likes: 126
old hand
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old hand
Joined: Dec 2023
Posts: 1,136
Likes: 126
I would say man I wish could do that to mine but I have been stuck working the last 40 years at an exhaust shop..lol ,good job..muffler work is exhausting.

1 member likes this: 1983 G20 Van
Re: 1987 G20 Gypsy
1983 G20 Van #812661 April 25th 2024 12:18 am
Joined: Jul 2019
Posts: 11,619
Likes: 455
S
Maniac
Offline
Maniac
S
Joined: Jul 2019
Posts: 11,619
Likes: 455
Nice Teamwork

1 member likes this: 1983 G20 Van
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