daytonajim00
Newbie
Posts: 39
Reg: 04-11-14
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10-18-14 06:06 PM - Post#2491943
I can't figure this out for the life of me! I sat in my 84 Chevy truck tonight drinking beer contemplating burning it down.
It started 2008 with a broken 1/4 20 bolt valve bolt in the 305. The machine guy said it would cost as much to extract it than to buy a set of remanned heads. We have amateur circle tracks around here and he had a set of heavy cast 350 heads he remanned so I took them. I think they had slightly heavier springs. I put on headers, dual exhaust, new water pump, hei coil, and rebuilt the Quadrajet.
Well...the compression sucked on my 305 and the rings were worn and smoking, so fast forward to last spring and I dropped in a remanned 350 (.060 over) with a mild cam. I put on new oil pump, starter, electric fan.
Now with the new motor, I have two issues. One, I have a vacuum leak driving me CRAZY! I thought I tracked it to rail side intake so I took off intake and bought a new aluminum intake to start fresh. I checked the intake port mating with machinist dye and it seated fine. I bolted it on and it STILL has a vacuum leak! It will idle fine but stall in drive unless I jack the idle screw high, lets say 1500. I got 15" Vacuum steady in idle and compression is good.
Second issue, engine will not start again when fully up to temp and I have to wait an hour until it cools down. It runs a little on the warm side (.060 over and haven't upgraded radiator yet). Like I said, water pump is new, starter is new, battery is new. Grounds are good. Are the headers overheating the starter? Is the module on the HEI the culprit? Haven't thrown money at that yet.
If anyone has any advice, I'm at my witts end, please help! Hell you can come down here to Daytona. We live a block from the beach, it's a small house but I figure war heroes slept in worse, a sleeping bag down here in the AC would be paradise.  HELP!!
1984 Chevy C-10:
-350 (.060 Overbore)
-Elgin 1227-P cam (.450" lift, 232* DUR @ .050)
-GM Cast 3973487 heads (75cc)(1.97/1.5)
-Recurved Timing (15*,20*,10* Vac= 45* Total)
-Quadrajet M4ME (Rebuilt)
-TH350C
-Headers and dual exhaust |
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 scrambldcj8
"6th Year" Silver Supporting Member
Posts: 2753
Loc: Belchertown, MA
Reg: 04-06-03
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10-19-14 05:44 AM - Post#2492013
In response to daytonajim00
in the 305....and he had a set of heavy cast 350 heads he remanned so I took them...
Well...the compression sucked on my 305 ... I dropped in a remanned 350 (.060 over) with a mild cam. I put on new oil pump, starter, electric fan.
Now with the new motor,
Second issue, engine will not start again when fully up to temp and I have to wait an hour until it cools down.
Well it's no surprise the comp ratio sucked on the 350 headed 305......
Now the hot start issue. This reman'd 350 how much do you know about it? Reason I ask is if it was put together tight....meaning mains (rods/pistons and etc) were tight on install. When it is at operating temps....or warmer and you shut it down it can be a biatch to turn over...no matter where timing is or how strong of a starter you have. I have seen this before. So don't eliminate that possibility.
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daytonajim00
Newbie
Posts: 39
Reg: 04-11-14
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10-19-14 05:58 AM - Post#2492016
In response to scrambldcj8
I got it from an engine building shop. It was set up pretty much stock other than the mild cam. They've been around forever so I hope they didn't screw it up. But ya, regardless of timing, it's physically struggling when hot trying to turn over. Is this the type of thing that would break in? I only have about 100 miles on it.
I've warmed the engine up, shut it down, and spun it by hand when adjusting valves. Maybe I should replace the main battery positive cable to the starter to rule that out.
1984 Chevy C-10:
-350 (.060 Overbore)
-Elgin 1227-P cam (.450" lift, 232* DUR @ .050)
-GM Cast 3973487 heads (75cc)(1.97/1.5)
-Recurved Timing (15*,20*,10* Vac= 45* Total)
-Quadrajet M4ME (Rebuilt)
-TH350C
-Headers and dual exhaust |
Edited by daytonajim00 on 10-19-14 06:10 AM. Reason for edit: No reason given.
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50hotrod
Frequent Contributor
Posts: 1089
Loc: Wisconsin
Reg: 07-25-11
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10-19-14 08:31 AM - Post#2492041
In response to daytonajim00
Ignition timing is advanced too far.
Check the angle of the intake mating surface of the heads. Compare that angle to the angle on the intake manifold.
1950 CHEVY 2 DOOR 327 TRI POWER FENDERWELL HEADERS HEIDT FRONT SUSPENSION 700R4 TRANS 411 REAR
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Edited by 50hotrod on 10-19-14 08:34 AM. Reason for edit: No reason given.
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65_Impala
Very Senior Member
Posts: 5038
Reg: 12-29-02
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10-19-14 06:21 PM - Post#2492174
In response to daytonajim00
Is there a spacer or sleeve on the bolt between the power tab on the starter motor and the solenoid? If the tab comes out of the starter motor right against the end of the solenoid then you have a low power starter motor and it won't work for a 350.
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daytonajim00
Newbie
Posts: 39
Reg: 04-11-14
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10-20-14 03:01 PM - Post#2492332
In response to 50hotrod
Ignition timing is advanced too far.
Check the angle of the intake mating surface of the heads. Compare that angle to the angle on the intake manifold.
I made a DIY angle guage out of a 2$ aluminum yard stick setting it off the heads. It matched the intake so the angle is spec. I also layed some machinist dye, dry-fit the intake, and the impression transferred to the intake looked good.
Is there a spacer or sleeve on the bolt between the power tab on the starter motor and the solenoid? If the tab comes out of the starter motor right against the end of the solenoid then you have a low power starter motor and it won't work for a 350.
I couldn't see. I'll try to pull the starters p/n and research that. I can see the header is 1/2" from the starter case.
1984 Chevy C-10:
-350 (.060 Overbore)
-Elgin 1227-P cam (.450" lift, 232* DUR @ .050)
-GM Cast 3973487 heads (75cc)(1.97/1.5)
-Recurved Timing (15*,20*,10* Vac= 45* Total)
-Quadrajet M4ME (Rebuilt)
-TH350C
-Headers and dual exhaust |
Edited by daytonajim00 on 10-20-14 03:02 PM. Reason for edit: No reason given.
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