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Author Topic: need tune up help  (Read 7671 times)

Offline hogwild

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need tune up help
« on: December 25, 2007, 03:09:52 PM »
what would cause poping out of header, i have timing at 34 tottle,new msd dis &wires, set valves twice, new holley 750 carb,new plugs , distributer is in correct ,but still it pops out pas side header and shoots out blue flame. i also checked for vac laekes.
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1986 sb 406 ci
2003 mud buggy 1300 hp 528
if my wife askes it was only fifteen bucks

Offline VileZambonie

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Re: need tune up help
« Reply #1 on: December 25, 2007, 04:35:44 PM »
Sounds like a misfire. Check your wires, spray them down with some water and see if it runs worse or arcs.
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Offline hogwild

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Re: need tune up help
« Reply #2 on: December 25, 2007, 06:33:37 PM »
is that common for new wires to missfire? thanks for the reply villie . also is their much benefit to puting a glide in ? i cooked my 350 and can get a glide all done for 1000 bucks ,is converter the same? . thanks,   wayne
« Last Edit: December 25, 2007, 06:38:35 PM by hogwild »
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1986 sb 406 ci
2003 mud buggy 1300 hp 528
if my wife askes it was only fifteen bucks

Offline VileZambonie

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Re: need tune up help
« Reply #3 on: December 25, 2007, 07:32:52 PM »
It's not common but certain possible you have a voltage leak. Are all the wires on good? Did you use dielectric grease around the boots?

I assume you are talking about a 2 speed powerglide? There are no benefits at all you'd be going in the wrong direction. If anything go with a 700R4
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Offline hogwild

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Re: need tune up help
« Reply #4 on: December 25, 2007, 09:21:16 PM »
i used no grease didn't know it was necessary, why 700 r4 are they better than the rest ?. same gear ratio?. i will try water on wires tomorrow and let you know if it worked, maybe i will just get another set of wires and try them. what about converter for 700r4 , i just bought a new one for t-350 before i killed it
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1986 sb 406 ci
2003 mud buggy 1300 hp 528
if my wife askes it was only fifteen bucks

Offline werewolfx13

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Re: need tune up help
« Reply #5 on: December 26, 2007, 03:23:36 AM »
the 700r4 uses a different converter than the th350..the 700r4 is a 4 spd OD trans..lower first gear than the th350/th400, with a much better highway gear, its only drawback is it needs to have a few things done to it to equal or exceed the strength of a stock 350 trans..the 2 spd powerglide is a POS trans for street driving..from what I can tell with my '63 riviera, it stays in second gear all the time, bogging *slightly* in town and screaming on the highway. When you stick it in low, it goes into first. Bogging in town and screaming on the highway are two strikes against fuel efficiency, not to mention you lack additional higher forward gears for speed..its just not a wise choice. Converters are not the same on any of the GM transmissions, not to mention I wouldn't use a converter (even if its new) from a trans that died with the converter in it. Any matter in the fluid from the old trans could trash your new/rebuilt trans.
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Offline VileZambonie

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Re: need tune up help
« Reply #6 on: December 26, 2007, 08:46:51 AM »
I agree if your TH350 puked your new converter is worthless. Start over unless you spent big bucks on that converter you can have a shop cut it open and rebuild it.
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Offline hogwild

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Re: need tune up help
« Reply #7 on: December 26, 2007, 08:58:07 PM »
update ;  pulled off plug wires one at a time till popping stopped, replaced that wire, problem solved. my wires are brand new msd , i guess new means nothing. worst part is i probably cant return them now that i used them. also tranny is fine but i need a rear end .what shoud i get the 10 bolt is way to weak .
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1986 sb 406 ci
2003 mud buggy 1300 hp 528
if my wife askes it was only fifteen bucks

Offline VileZambonie

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Re: need tune up help
« Reply #8 on: December 26, 2007, 09:31:43 PM »
The 10 bolts seem to live a shorter life with larger tires when they've been neglected. Carrier bearing failure is quite common and usually ends up in a trashed assembly.  If you find a good 10 bolt though don't disregard it bc they are still pretty durable. People rave about them being better than 12 bolts due to pinion shaft diameter but I've rarely seen 12bolt failures caused by a weak pinion shaft. What exactly failed in yours?
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Offline hogwild

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Re: need tune up help
« Reply #9 on: December 26, 2007, 09:38:23 PM »
havent taken it apart yet, but i am thinking the pinion shaft. it just spins when truck is in gear and nothing moves. it has spool in it too. is it farly pricey to rebuild with good axeles gears etc...?
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1986 sb 406 ci
2003 mud buggy 1300 hp 528
if my wife askes it was only fifteen bucks

Offline VileZambonie

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Re: need tune up help
« Reply #10 on: December 27, 2007, 07:47:35 AM »
Well that explains it. If you are driving on the street with a spool it's only a matter of time before it breaks.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Captkaos

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Re: need tune up help
« Reply #11 on: December 27, 2007, 11:17:32 AM »
10bolt + spool + street drving = good combination for failure.
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Offline hogwild

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Re: need tune up help
« Reply #12 on: December 27, 2007, 09:03:59 PM »
holey crap ! i price out getting my rear end rebiult with auburn locker new axles and 411 gears  ,2400 bucks . anyone know where i can get one a little cheaper ? . buy the way i new i was asking for trouble with the spool, but didnt think it would kill it that easy, maybe 10 miles since i put it in. think 411 are to low ? . tires are 29 tall 13 wide, 6500 rpm motor. very little hwy,mostly rip around town
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1986 sb 406 ci
2003 mud buggy 1300 hp 528
if my wife askes it was only fifteen bucks

Offline VileZambonie

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Re: need tune up help
« Reply #13 on: December 27, 2007, 10:40:42 PM »
http://www.csgnetwork.com/multirpmcalc.html

Cheapest way will be to build it yourselfor shop around for used stuff. Try craigslist
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline hogwild

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Re: need tune up help
« Reply #14 on: December 29, 2007, 09:24:08 PM »
4.11 puts me at 3100 rpm at 65 mph, think i should go lower  ?, only occasional hwy. .want it to be very quik  0-60
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1986 sb 406 ci
2003 mud buggy 1300 hp 528
if my wife askes it was only fifteen bucks
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