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Old 07-21-2002, 10:15 PM   #1
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Question Will this 350 replace my 305 Carbed? 86 Z28

Ok here is the skinny:
I have an 86 Z28 carbed 305 stock
I also have this remanufactured motor from Recon that says this on the tag:
GM 350 69-79 2 Bolt Main Single Rear Seal
Will my heads work on this? Any other items that will need to be replaced such as flywheel, etc.? I am going to get a new intake manifold (want to ditch the smog), but other than that I want to replace as little as possible. Thank you!
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Old 07-21-2002, 11:00 PM   #2
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Also, I have heard that my T5 tranny will not handle this kind of output. I have a very tight budget, any one have an idea on how to make this happen. Thank you!
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Old 07-21-2002, 11:33 PM   #3
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so does this motor have heads or you are planning on using the ones from the 305?

if you need heads the ones from the 305 will fit, BUT the car will run like absolute *** (if it does run at all)

so if you don't have much money, wait.... don't go about it half assed or else you will be nickel and diming it forever and you will never be happy w/ it

check out a set of GMPP vortec heads for cheap heads that perform well

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Old 07-22-2002, 12:08 AM   #4
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Why would the 305 heads make that 350 run like crap??? GM's ZZ4 motor comes with 58cc heads, and those are the same size as 305 heads. That motor makes like 10-1 compression. I wouldn't put 305 heads on a 350, but I don't see why it wouldn't run??!?! I am planning on doing the same thing bro, only I had planned on using a newer 4-bolt rear main seal 350 block. I have been thinking about just buying a ZZ4 and changing the intake manifold and a few other things. I had thought about the long way around, but that would take too long and might cost a little more money. Plus all the suspension work you need to do on a 3rd gen before you even begin to tackle power. It should be pushing 400 smog legal horses. Which won't be too bad for a car that used to sport 165 Click the image to open in full size. Well, good luck man, let us know how it turns out!

Will

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Old 07-22-2002, 12:25 AM   #5
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The guy I got the motor from told me that Vortec heads WOULD NOT fit this motor (because it was for 69-79?) And yes, for the time being I am keeping the 305 heads. I also went with a single rear seal because I didn't want to replace the flywheel. My biggest concern right now is the tranny. Will my T5 hold up to this motor? Mind you I figure it MIGHT output 250HP max, as it is just a cheap rebuilt. Thank you guys!
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Old 07-22-2002, 12:38 AM   #6
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The T-5 should hold up fine, I have seen them with 300-400hp behind them and they still are ticking. 250 hp will probably not break anything.

Oh and PS, your 305 heads will run just fine with that 350, If you have flatop pistons your are looking at about 9.5-10:1 some where in there, just fine for 90-93 octain. You will probably get better throttle response as well. If you have the time pull the heads apart and go through them, at minimum replace the valve stem positive seals. A 3 angle valve job and a back cut on the valves wouldn't hurt either.

Take it easy,
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Old 07-22-2002, 02:16 PM   #7
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Um, in '86 it went to 1 piece rear seal, you are trying to use a 2 piece rear seal, just a minor problem. You'll need a different flywheel, that's what I did.

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[This message has been edited by Mark A Shields (edited July 22, 2002).]
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Old 07-22-2002, 02:39 PM   #8
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yeah, I have a new flywheel as of today. Thank you though
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Old 07-22-2002, 02:47 PM   #9
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by stanghunter211:
Why would the 305 heads make that 350 run like crap??? GM's ZZ4 motor comes with 58cc heads, and those are the same size as 305 heads. </font>

They have the same size combustion chamber size but usually a 305 head has smaller runner volumn so they flow less than most 350 heads. You need to look up the part numbers to find out what size runner volumn you have and then make a decision from there if you can use the 305 heads or get different heads. The car will run fine with 305 heads it just might not be at the power level you thought you wanted.

The aluminum "Fast Burn" heads will bolt up to older engines. I was looking at getting a set for a 350 I was going to build up until I spun 3 mains. Jim Pace has them for about $1100 for the pair complete with valves, springs, retainers, and rocker studs if you are interested in that route. www.paceparts.com

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Old 07-22-2002, 02:49 PM   #10
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upon further inspection, I have determind this motor to be a 4 bolt motor. I dont know if this changes anything, but whatever. Thank you again!
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Old 07-22-2002, 04:26 PM   #11
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heh, I got some 350 heads that are remanufactured (got them from the place that remaned the motor) so that is solved! I also heard that the 350 moght need an oil cooler? It is very hot and dry here, and sometimes I get stuck in stop-and-go traffic. One more thing: I know that there are problems with the stock GM 195F thermostats, what if I bump it down to a 180F or so? Thank you for the input
!!!
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Old 07-22-2002, 04:26 PM
 
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