350 TBI tows 5000/6000lbs

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donforeman
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Re: 350 TBI tows 5000/6000lbs

Post by donforeman » Fri Jun 08, 2018 10:10 am

n2xlr8n wrote:
Fri Jun 08, 2018 9:28 am
Truckedup wrote:
Fri Jun 08, 2018 6:54 am
donforeman wrote:
Thu Jun 07, 2018 9:42 pm


I like this site. Its an old sales info page for GM. I downloaded the copies for my vehicles. I have seen C2500 trucks with 454. There was an ad for one a few days ago I considered, but the owner started talking about a radiator problem and I did not want to drive that far to find trouble.
https://www.gmheritagecenter.com/gm-her ... -kits.html
Uhhh, I still think the 454 was not available in a 1/2 or 3/4 ton for 88-98 , just the one ton series like a dually...
Not a truck per se, but I owned a 88 (or 89) Suburban 3/4 ton 2WD with the 454/T400. I regret selling it.
http://www.roadkill.com/chevrolet-454-s ... rnout-fun/
Or the 454ss half ton, not great for towing or a hot rod, but it is a big block in a half ton.

gmc406
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Re: 350 TBI tows 5000/6000lbs

Post by gmc406 » Fri Jun 08, 2018 10:12 am

My uncle back in the day had a 93 3/4ton with a 454.

cardo0
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Re: 350 TBI tows 5000/6000lbs

Post by cardo0 » Sat Jun 09, 2018 11:38 am

If you're thinking engine swaps I meet a guy at a truck stop that put a Cummings 12V in his van. The 12V has mechanical fuel injection and alot less headaches to swap with. You can see alot of 12V donor trucks up in the rust belt states. My '96 dually has 280k mi and the oil level doesn't change between change intervals. I'd swap in a Cummings before any BB if the money was the same.

donforeman
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Re: 350 TBI tows 5000/6000lbs

Post by donforeman » Sat Jun 09, 2018 6:36 pm

I am not really looking to swap anything. I think if a tune, cam, bowl port and springs will not do it, I should look at big blocks trucks or vans with hd running gear. The 4l60e and 14 bolt sf rear will only hold so much. I did look at the cummins swap into a chevy van on YouTube. Its a total hack job on the g van. They have to cut way back into the van for added length and a custom dog house. I drove the van today to pick up a Kalamazoo 7A band saw. Its a super nice driving van, just under powered at times.

donforeman
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Re: 350 TBI tows 5000/6000lbs

Post by donforeman » Sat Jun 16, 2018 8:57 am

I got a cheap Jet Stage 1 tbi chip to look at second hand. Its for a 1995 350 4l60e C/K truck so I put it in the van as a test as the specs were close enough not to blow anything up.

Main Spark vs Map Table was bumped by 1.1-3.2 degrees in a few cells. This is supposed to be for a stock truck tbi engine, but a lot of the timing changes were at 5000-6000 and WOT so not even noticeable as the engine never runs that high.
They bumped the fuel cut off from 98 to 115 mph, the only way my van will ever see that, is if it falls off a cliff.
The main fuel table was increased in almost the same areas they bumped the timing. Probably to combat detonation by making the engine very rich.

My self burned chip with only revised shift points in a few gears was much more noticeable when towing. I cant believe, companies get away with selling this for $150 and up. My sample cost almost nothing though, so it was almost worth it just for the education on what not to do.

cardo0
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Re: 350 TBI tows 5000/6000lbs

Post by cardo0 » Sat Jun 16, 2018 1:55 pm

donforeman wrote:
Thu Jun 07, 2018 1:44 am
I never tow in OD with the 4l60e. Like I wrote before 3rd and 2nd are the gears I use when towing. I did purchase a take out 14097395 roller cam (196/206@109) from a marine engine for the van in case the block happens to be roller comparable. If its not then, I will figure something else out and I can get rid of the roller cam easy for what I gave for it.
Okay that's the cam I have in my '94 Z28 now. Didn't want to change the valve springs and I liked what that cam does for the RamJet 350 motor - something like 400 ft-lbs and a flat curve. So in my Z28 that cam burns rubber like more than I can handle for a decent launch for the 1/4 mi. Had to change back to stock stall converter from the 2200 - 2400 TC I was using trying to reduce the wheel spin. That tight LSA makes some great torque down low.

Installing that cam and fix/upgrade your tune sounds like you have a good plan there. And if you pop the heads use a 0.015" Felpro shim gasket should give you some quench - if the pistons and compression compliment it. I don't think you need a whole lot more flow for what you are trying to do. I think you mentioned swirl port heads and I recall those ports are fairly big to start with.

Yeah, it reads like you are doing the best you can for the money with that cam and trying it will tell you what more you need. Good luck.

donforeman
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Re: 350 TBI tows 5000/6000lbs

Post by donforeman » Sat Jun 16, 2018 4:45 pm

Thank you for the advice. Yes, I have not heard anyone complain about the ramjet cam for low rpm use, so I decided to grab one when I found it reasonable. I did get a few victor shim gaskets on close out a few months ago, along with a 180 degree t-stat and other engine gaskets. All of it is on the shelf, waiting for the slow season so I can tear it all apart for a weekend.

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Re: 350 TBI tows 5000/6000lbs

Post by Truckedup » Sat Jun 16, 2018 4:54 pm

Around 1978-80 construction was slow so i took a job at a fleet garage for a time..I was not a real skilled engine mechanic so I did a lot of suspension work and some things no one really liked to do.....And there was a rash of bad cams in 350 Chevy engines during that time.. Hated to change cams in those damn vans...Or pull the heads..... :D
World's fastest stock frame 650 cc push rod gas land speed racing bike...

va454ss
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Re: 350 TBI tows 5000/6000lbs

Post by va454ss » Sat Jun 16, 2018 7:55 pm

TriY headers, h pipe, free flow muffler, electric fans, and underdrive pulleys.

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