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Old 02-27-2003, 04:51 PM
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Post dirt track 305

Hello all, I new here and hopeful that you guys can send me in the right direction.
I am going to build a 305 for my dirt track car. My class specifies that I must use stock 305 parts. Even though many Chevy head will bolt on, I must use a "305" head (1.84/1.50)non vortec. I have concentrated mainly on hi-po heads (441, 487x etc)my experience with 305 stuff is limited. I've been looking at some web sites for some casting numbers for a good stock 305 head. Also, I can run any stock intake, once again 305 non vortec. Any ideas for some casting numbers, and things to look out for? Thanks in advance.

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Old 02-27-2003, 05:45 PM
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the best 305 casting i`d say would be the 416 casting. used from 80 - 86.
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Old 02-27-2003, 06:23 PM
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My 1980 305 (from a Camaro in Japan of all places) came with the 416's, they have pretty big ports, bigger than the average older 350's. I don't know if there is another pre vortec head that is better, only that the 416 was a good one : ). There are a few sites on the net for 305 sprinters maybe someone could email a racer in another state and they wouldn't mind letting you in a few secrets?, I'll take a guess that the 4 bbl inlet manifold on those 1980 305's is a good one too (can you modify the inlet at all?)
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Old 02-27-2003, 07:15 PM
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No machining of anykind save "trueing" the heads. It's a budget/beginner class.
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Old 02-27-2003, 07:17 PM
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Oh and by the way thanks for the info!!!
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Old 03-03-2003, 07:30 PM
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Anyone have an idea then for a good intake or exhaust manifold casting number?
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Old 03-03-2003, 07:48 PM
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For exhuast maniolds I would think the old Ramshorn looking manifolds would be the best,if they are allowed sorry don't know a #.
Does the carb need to be a 2bbl??
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Old 03-08-2006, 08:44 PM
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ive got what you want...maybe

hey i have two sets of 305 heads just laying around that need to be completely rebuilt but if you need em ive got em.
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Old 03-09-2006, 06:12 AM
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Quote:
Originally Posted by nicefrog
I'll take a guess that the 4 bbl inlet manifold on those 1980 305's is a good one too (can you modify the inlet at all?)
All the production 4 bbl. intakes were basically the same, I'd stick with the oldest cast iron intake you can run. The aluminum ones were prone to warping. Ditto to what everybody said on the 416 heads, about as good as it gets for a production line 305 head. Are you restricted to cast iron exhaust? Some of the 80's stuff had tubular exhaust "manifolds", not exactly headers but they'd save you some weight. Are you restricted to a stock 305 cam? The L69 305 HO cam is not bad, I don't know of a hotter one used in a production 305 but there may have been.
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Old 03-09-2006, 02:49 PM
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The most important question is....Do they tech well? If not, a stock 350 is in order.
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Old 03-09-2006, 03:15 PM
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My question is has anyone noticed this post is three years old?
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Old 03-09-2006, 03:40 PM
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I wonder if he's won any races yet?
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Old 04-20-2008, 03:46 AM
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Just Bought A Former Sprint Car Motor Which Is
12.5 Forged Pistons .030 400 Crank Turned To 350 Specs 6" H Beam Rods All In A 305 Block With Old 461 Casting Heads And Fuel Injection Ran With The Open 360 Cid Class And Turned A Respectable
13.68 Lap Time On A 1/4 Mile Clay Track I Have It In 3000 Lb Stock Car
And Am In The Top 5 Very Weekend Once I Put It In My 79 Mailbu
For A Big Money Drag Race And Ran A 13.12 1/4 Mile On 8 " Street Tires The Little Motor Ran Like A Big One
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