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09-19-2004, 08:55 PM
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#1 |
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E.H.F.D Engine #2
Join Date: Feb 2003
Location: East Hampton, NY Long Island
Posts: 916
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305 to 350
Hey i was thinking about dropping a 350 in my truck. The engine comes with everything except a starter and alternator, so there is no major parts that need to be switched over. I was wondering if there is anything you guys know of that will have to be changed in order to go to a 350 from a 305. Will the manifolds bolt right up? and how about the motor mounts... will they need to be changed in any way? thanks alot, NICK
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-NICK '72 K10 SWB Fleetside. Avocado Highlander 350-4speed-NP205 Frame Off Re-Creation '89 GMC V3500 C/C Flatbed Plow Truck 454/SM465/Np205 '15 Chevy 2500HD CCSB High Country Duramax '22 Tahoe Premier Duramax |
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09-19-2004, 09:17 PM
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#2 |
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Senior Member
Join Date: Jul 2003
Location: Indianapolis, IN
Posts: 1,277
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Is the 350 the same era as the 305? I was thinking 86 was about the time GM went to a one piece rear main seal from the 2 piece. The flywheels don't interchange between the two styles. The other problem can be the dipstick. They were on the passenger side until the late 70s or early 80s, the later ones are on the driver side. This can cause a problem if the exhaust manifolds don't match the dip stick location. Everything else will swap over.
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09-20-2004, 04:45 PM
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#3 | |
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What I drive
Join Date: Apr 2004
Location: Star, MS
Posts: 418
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Quote:
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1986 Chevy Crew Cab Dually(Choo-Choo Conversion) 2006 Chevy Equinox |
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09-20-2004, 06:48 PM
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#4 |
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Senior Member
Join Date: Jul 2003
Location: Indianapolis, IN
Posts: 1,277
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One other thing I remembered is if the 350 has an aftermarket intake and you have air, make sure the manifold has the required threaded boss for the A/C bracket that attaches to the intake on the driver side.
You might also make sure the manifold has all the required bosses to mount the factory bracket for the accelerator cable. Some of the earlier aftermarket intakes didn't have all the required threaded bosses. |
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09-20-2004, 06:51 PM
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#5 | |
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Senior Member
Join Date: Jul 2003
Location: Indianapolis, IN
Posts: 1,277
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I stand corrected on the dipstick location. I must have gotten condfused, my 84 has a 73 vintage 350. 
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09-20-2004, 07:14 PM
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#6 | |
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What I drive
Join Date: Apr 2004
Location: Star, MS
Posts: 418
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Quote:
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1986 Chevy Crew Cab Dually(Choo-Choo Conversion) 2006 Chevy Equinox |
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09-21-2004, 03:03 AM
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#7 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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I think the knock sensors are different.
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09-21-2004, 04:02 AM
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#8 |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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manifold won't work period unless its a 4 barrel 305. I think GM went to 4 barrel 305 in like 83, but don't get me lying.
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1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord |
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09-21-2004, 04:57 AM
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#9 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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I think 80 was the first year for the pass side oil dipstick. 86 was first year for 1 piece rear main, 87 had centerbolt valve covers and little distributor.
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1974 Jimmy- 5.3/4L80e/NP241 |
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09-21-2004, 02:33 PM
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#10 |
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Registered User
 
Join Date: Apr 2004
Location: Sacramento
Posts: 3,737
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I just did this on my 81 and the oil dipstick thing was a problem but then I also realized I needed new exhaust manifolds or headers to fit the different bolt pattern aka the 7th bolt. I solved it all by adding some edlebrock headers. now the exhaust bolts up and I can use the dip stick. Easy swap really. good luck.
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09-22-2004, 12:39 AM
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#11 |
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Registered User
Join Date: May 2004
Location: Lubbock, Texas
Posts: 2,121
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my 83 with a 305 had a 4 barrel
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'96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer |
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09-22-2004, 01:08 AM
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#12 |
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Registered User
Join Date: Apr 2004
Location: Sacramento
Posts: 3,737
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my 81 had one too! In fact I used my intake and carb off of the 305 to put on the 350
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09-22-2004, 01:21 AM
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#13 |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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Yeah i looked today in LMC and 81 was first year for 305 to have a 4 barrel. GM called it a "high output" 305. My 80 has a 305, and its just fine for me
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1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord |
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