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Old 10-22-2006, 01:01 AM
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305 performance

OK, this thread is strictly for 305 performance an not for arguments about how the 350 is a better engine. If this is you, then i would ask you not to reply. I just bought a 305 engine today for $100 block cast 14010201 heads 14014416. I was told it was out of an 81 El Camino. As far as i can tell it has been freshened up for how clean the engine is. The car im going to be installing the engine in is an 86 z28 that i got for $250 from my buddy. someone does know how to check there oil so the engine is junk.

OK the parts list. i have a MC1730 cam i got for $30 from a friend, specs. lift .420 intake/.442 exhaust, and duration @ .050 is 204 intake/214 exhaust. RPM performance edlebrock intake i got for free, found on the side of road. A 650 CFM edlebroke i pick up for $40 from another friend. I was just wondering if they combo would work well together for if they would counter each other. i would like to use these part just for the fact that i already have all of them and could be put together fast and wouldn't cost much.

i am trying not to break my bank for i have another project on hand. i am in the process of building up a 455 superdudy for my 77 formula which is my going to be my drag car. I am only 19 with high hopes and a lame job. any information or help would be great. thanks
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Old 10-25-2006, 06:41 PM
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Not going to argue with those economics.

I'm all for doing something for cheap.

I believe that the parts you suggested will be ok. But, I would not call it performance. The car should be a good daily driver but don't try to smoke anyone, not happening with a 305. I know, I pulled the 305 out of my truck for a BBC. I had tryed all my pocketbook would allow to get cheap HP out of it. Just really not a good base for 'performance.' But as I said, should be a solid daily driver.

Just an average Joe's opinion. Please, take it for what it's worth.

Jay
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Old 10-25-2006, 07:28 PM
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If you port and mill the heads and use thin head gaskets and cheap 1.6:1 rockers you actaully won't have a bad 305. In fact while it won't be optimal, I would guess it'll beat most 5.0 mustangs.
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Old 10-26-2006, 11:36 AM
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I had that same combo except with a Q-jet.
It 15.8 @ 85mph in a 70 Monte carlo.
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Old 10-26-2006, 03:58 PM
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Damn, I guess you were lucky to find an Edelbrock intake on the side of the road.
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Old 11-04-2006, 10:43 PM
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305 .040 over, dished pistons, moly rings, Lunati BracketMasterII 00016 cam set, Power Plus dual plane intake, 601 port matched heads milled to 55cc chambers, Mr Gasket thin head gaskets, Dynomax Blackjack headers, 2 1/2" dual exhaust, and an untuned 750cfm stock Quadrajet in my 1979 Malibu.

dynoed 170hp/225ftlbstq with my only limiting factor being the 2.29 rear gears.
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Old 11-05-2006, 07:47 PM
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One factor to think of.

The biggest thing in deciding what kind of performance you will get is to look at your power to weight ratio.

i.e. Big car, little motor = little performance
Little car, big motor = great performance
What is your power to weight ratio?
Is the monte carlo mentioned earlier in this thread lightened up at all?


Jay
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Old 11-05-2006, 09:00 PM
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Are the cam and lifters new?
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Old 11-06-2006, 12:14 PM
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The new ENGINE MASTERS magazine Winter is out and does a great budget buildup on a 305. streetable horsepower and 13 in vacuum.

Last edited by xntrik; 11-06-2006 at 12:42 PM.
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Old 11-06-2006, 12:35 PM
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You might find something of interest in article from CHP.
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Old 11-06-2006, 12:59 PM
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I would think that maybe a 650 would be a a little large for a 305...

But, I suppose that the secondaries probably just won't open up all the way.

Anyway, I really don't see why everyone is down on 305s. I had a 305 in my 87 pickup, and it made good power.

I think a main reason that people are so down on the 305's is because many of them didn't rev high, but that was because of the valvetrain, not anything in the design of the 305 itself.

The only big consideration is that a 305 is NOT a 350. Although all the 350 external parts will bolt up to it, they won't get the same result. A lot of guys with 305s slap 350 parts all over them, and they end up with too big a carb, to big of a cam, to large of exhaust ports. I would personally recommend taking a look at some of the good 302 and 327 combos, and trying to shoot for that.

A nicely built 305 can be more powerfull than those smogger 350s that a lot of people end up running (there's a lot of 70's and early 80's 350s out there that are barely tugging 200 horsepower! In 73 the base 350 for the camaro was rated at 145 horsepower...almost every 305 is rated higher than that!) The 81 camaro had either a 150 or 165 horse 305, I would guess that the el camino motor would be the same as one of those two motors...probably the 165 as I think the 416 heads were the more powerful ones.

I would port match the heads to your intake, get a nice mild cam, and slap some small-primary headers on that puppy, and have some fun. Those 80's camaros often had a 305 as the most powerful motor option, so if you can make more power than the stock 305, you could have a pretty decent car. If you could make 250, maybe 275 horsepower, you could probably tear an 80's camaro apart. I'd put subframe connectors...
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