SOLD Please Take This 305.SOLD

[1987 GMC Jimmy]

Does anyone want a 305 long block? It’s got some accessories, too. It’s in my way, and I don’t want to throw it away. It’d be a good project to get a roller going. It came out of an ‘86 K10, 26K miles since new, was in Hurricane Katrina, was completely rebuilt by a machine shop.

I’d take the heads off and make sure it’s clean and lubed, but it should be good to build. It’s got the 601 heads so decent in the 305 world.

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[HotRodPC]

Sure wish I was closer. If it's a runner, I'd sure put in my 86 K5 to at least get it running until I can build this 350 engine I have for it.

 

[SquareRoot]

305's, 400's and pit bulls. They all "sounded good at the time." Lol

 

[1987 GMC Jimmy]

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[HotRodPC]

I bet that thing can be made to run again. I've got people checking on ride for it. If someone else needs it and has the means to get it, don't let it go to waste, go get it. I'd just put it in my K5 as a runner for the time being. Hopefully one of the tow bros that goes that way wouldn't mind stopping to pick it up.

 

[Colin]

No experience with one, but everyone talks about how "gutless" a 305 is.
What can be done, fairly easily, to beef it up some to add some torque in
the lower RPM range, and boost HP a bit.
And, is it worth it?

 

[1987 GMC Jimmy]

No experience with one, but everyone talks about how "gutless" a 305 is.
What can be done, fairly easily, to beef it up some to add some torque in
the lower RPM range, and boost HP a bit.
And, is it worth it?

I daily drive a stock 305, and it’s not a race car, but it can at least get out of its own way. The 305 is held back by its puny bore, and that’s why people flock to the 350 because it’s a better performance platform. That being said, the same bolt ons and tricks to boost power are universal to SBCs. The 601 truck heads are almost as good as the 416 heads, and both are HO heads by 305 standards. You can port and polish these heads up to 2.02/1.6 valves I’m pretty sure. A cam upgrade helps. I don’t like anything that screws with vacuum too much on a daily or semi-daily driver so something like the Comp 12-300-4 or equivalent seems sufficient. An aluminum intake like the Edelbrock 2101 might help marginally, but it’s so much easier to assemble with the lighter intake. A good ignition system (standard HEI), proper gearing, and a more advanced base timing without making it ping help. Headers and a deletion of the cat and air injection should bring it home. I haven’t tested this out yet, but this hypothetical motor should be around a 300 hp plant. Not bad, but the same investment yields you more in a 350, and they’re pretty ubiquitous. That’s why people shy away from them for the most part. I like the little engine, though. It’s more reliable than I could have ever hoped for, and when it gets tired, I’ll rebuild it, do the aforementioned upgrades, and keep on trucking.

 

[TravisB]

There's a guy with a machine shop in town running 11s with a 305. It gets some work done for the little powerplant.

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[HotRodPC]

I sent you a PM @1987 GMC Jimmy . One of my tow buds is leaving for NOLA Sunday or Monday and will be there for a week or 2 pull IAA cars then come back to OKC. He said he'd stop in Wesson to pick it up if you can wait that long.

 

[HotRodPC]

I daily drive a stock 305, and it’s not a race car, but it can at least get out of its own way. The 305 is held back by its puny bore, and that’s why people flock to the 350 because it’s a better performance platform. That being said, the same bolt ons and tricks to boost power are universal to SBCs. The 601 truck heads are almost as good as the 416 heads, and both are HO heads by 305 standards. You can port and polish these heads up to 2.02/1.6 valves I’m pretty sure. A cam upgrade helps. I don’t like anything that screws with vacuum too much on a daily or semi-daily driver so something like the Comp 12-300-4 or equivalent seems sufficient. An aluminum intake like the Edelbrock 2101 might help marginally, but it’s so much easier to assemble with the lighter intake. A good ignition system (standard HEI), proper gearing, and a more advanced base timing without making it ping help. Headers and a deletion of the cat and air injection should bring it home. I haven’t tested this out yet, but this hypothetical motor should be around a 300 hp plant. Not bad, but the same investment yields you more in a 350, and they’re pretty ubiquitous. That’s why people shy away from them for the most part. I like the little engine, though. It’s more reliable than I could have ever hoped for, and when it gets tired, I’ll rebuild it, do the aforementioned upgrades, and keep on trucking.

The other reason people usually get away from them is, the rebuild kit is more expensive than the 350. So by the time you pay the cost difference in the rebuild kit, machine work cost the same, then for the difference you can usually source a rebuildable 350 core so you break even and get the more powerful engine. I've been told there's not a huge difference in mpg either between the 2 so you may as well have the more power there when you want it for the same money. ME? I never get better mpg with more power cuz it's not there when and if I need it, cuz if it's there, I'm going to use it just because I can and there goes the gas gauge.

 

[bigcountry78]

I think most people overlook how much axle gears affect your power. My cousin has an 84 Sierra that left the factory with the 305 and 3.08 gear ratio. He swapped in a set of 3.73 axles from my parts truck and he said it made a huge difference. He was running 33’s at that point. I’ve also heard that engine go screaming by in the dark when his auto hubs broke, and the only way he could get through the mud that night was to put it in low range and floor it. It’s a tough little engine.

 

[78C10BigTen]

There's a guy with a machine shop in town running 11s with a 305. It gets some work done for the little powerplant.

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Crazy to think a lil 305 can make the wheels come off the ground!

 

[K201979]

Whats the story on 416 heads. Im seeing some on craigslist around $275. That about normal?

 

[1987 GMC Jimmy]

Those are the 81-86 Camaro HO heads. If they’re refurbished, and you can get documentation to that affect, I’d say absolutely. If they’re just old, pulled heads, I’d say no way, more like $150, $175 tops. People put them on 350s to boost compression or work them for the few performance 305s out there, and they aren’t trash heads, especially considering they’re from the late smogger era.

 

[K201979]

Whats the pros/ cons them vs. vortecs? I know nothing about heads(obviously) and i havent researched, just happened to be cuirios about them about the time u mendtioned them. Had thoughts of maybe someday votec heads on my 350, now not sure which direction to go. Again, no research yet and just thinking way down the road. So, thanks for the info.