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Old 08-20-2009, 11:57 PM   #1
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Who has the fastest 305?

Hi everyone.

I know it's not the block of choice, but I was curious who has the fastest 3rd gen 305 based car?
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Old 08-21-2009, 12:39 AM   #2
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Re: Who has the fastest 305?

Someone out there should be better than this, but mine runs 14.5's n/a and 12.2 with turbo in sig pushing 13psi.
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Old 08-21-2009, 02:48 AM   #3
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Re: Who has the fastest 305?

mw66nova was running 12.3's n/a.. i'm pretty sure the comp eliminator guys have been mid 11's. but i dont think they run a true 305 block 305 but instead a destroked 350.
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Old 08-21-2009, 08:37 AM   #4
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Re: Who has the fastest 305?

negative, the super stockers have been 10.7x's or so on an n/a .060" over 305 block with "untouched" 416 heads. but you gotta look at the total package. those cars are completely unstreetable with huge duration and narrow lsa camshafts, 5500+ converters, and 5.13+ gears.

going 12's n/a is pretty easy. i went 12.3x's with a street/strip setup, but i was using some old school single grind camshaft and i know that i coulda gone faster with a new technology solid roller camshaft, but we weren't ever able to make it happen.

Preston had the fastest documented tradtitional small bore streetable 305 combo back in the day. car ran low 10's/high 9's on high boost and got 20+mpg with a street tune. it was a tuned port combo if i remember correctly. last i heard he is running a 4.025" bore/3" stroke combo that nets him 305 cubes but still has a big bore, big cylinder head, and big turbo...the car is faster but not by much. don't even know if he's around still.

we gotta new guy in the 305 club, can't remember his name. he's got a firebird, with a t56. he's been upper 12's n/a, low 11's on a 200 shot, and now he's running a blower, has been 11.99 with the blower, and he just put a 100 shot back on it, but not sure if he's tried it out yet at the track.
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Old 08-21-2009, 01:42 PM   #5
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Re: Who has the fastest 305?

yup, crazy stuff. i was thinking since my 385 spit out a rod, to do a wild 305 combo. i figure if people can build a 9 sec n/a 400+sbc, why not a low 11 sec 305?


since i have two nice 305 blocks already. my heads are trashed and way too big anyway, so maybe afr 180 eliminators? decent size solid roller(mid .550's, 235-240 duration, 108lsa), 6" rods, ported rpm airgap, and a 650 carb. would be pretty impressive to be running with the big boys with a "rebuilt" 305. haha

or i could use the old camel backs i had from my first motor. i did a nice port job on them. took my 383 into the 12's with a smaller cam and a 650 carb.
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Old 08-21-2009, 02:37 PM   #6
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Re: Who has the fastest 305?

11.50s at 116 on my old 305 with a 150 shot. was good for 13.0-13.1 at 102/103 on motor. Definitely nothing crazy out of it, this was at least 8 years ago I'd imagine.
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Old 08-21-2009, 03:33 PM   #7
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Re: Who has the fastest 305?

I'd like 13's (13.0-13.9) out of my tbi, and with the wynjammer SC, 100 shot, and lots of weight reduction (plan to get car around 2800 meaning a drop of 600lbs roughly, in which I have already dropped over 150 in the engine bay alone and still have lots to lighten in there) I think 13's are very reasonable. I don't care for a straight line like most of you, which is why 13's is just fine as I plan to slide my Roxie around turns, so suspension and weight is more in my vision than power. Also if I can get even better than my already 18mpg I get now or stay the same in doing all this I'll be a super happy camper. But I would like to see some of these LO3, LG4, L69 and LB9's go. Videos anyone? Pictures of these motors?

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Old 08-22-2009, 11:06 AM   #8
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Re: Who has the fastest 305?

there is a local guy with a black formula...i hadn't heard a supercharger on it lately, but he was running a 200 shot banging the gears...beautiful car too. he had 350 high perf. heads of some type on it. hopefully he'll chime in...
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Old 08-24-2009, 09:48 AM   #9
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Re: Who has the fastest 305?

i guess your talking about me 86iroc, i just put a weiand 142 on a few weeks ago, i went a 11.990 with a real fat tune and only 26 deggres of timing to be safe, i plan on taking it to the dyno up in fallston sometime this week or next and get it tuned, im hopeing to run mid 11s, then see what the 100 shot on top the blower will do, maybe high 10s. The fastest i ever went all motor was a 12.48 at 109 last halloween in low 40 deggree weather
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Old 08-24-2009, 01:13 PM   #10
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Re: Who has the fastest 305?

Quote:
Originally Posted by mw66nova View Post
negative, the super stockers have been 10.7x's or so on an n/a .060" over 305 block with "untouched" 416 heads. but you gotta look at the total package. those cars are completely unstreetable with huge duration and narrow lsa camshafts, 5500+ converters, and 5.13+ gears.
I know of a Super Stock Monte that runs 6.50's in the 1/8... Flattop pistons, .700" lift cam, single plane intake of some sort with a QuadraJet, 1-7/8" headers with merge collectors, 416 heads must maintain stock runner volume of 163cc with 1.84/1.50" valves....Makes 538HP at 7800rpm...goes through the 1/4 around 8800rpm... his name is Larry Hodge...
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Old 08-24-2009, 04:48 PM   #11
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Re: Who has the fastest 305?

yea ^^ you were the one....ive seen you around car shows and the track this year in my truck. congrats on the blower...ill catch up with you soon....


as for 305 builds...there are a lot of stockers out there running 10's...and im really looking forward to building one SOON!!!

mw66nova had one of the cleanest and fastest street/strip 305's ever IMHO.
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Old 08-24-2009, 05:25 PM   #12
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Re: Who has the fastest 305?

Quote:
Originally Posted by I H8 WWD View Post
But I would like to see some of these LO3, LG4, L69 and LB9's go. Videos anyone? Pictures of these motors?

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mine started out as an lg4 in a base model 85 z28.



mid 12 second pass, not sure what it ran on this pass:

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Old 08-25-2009, 01:05 AM   #13
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Re: Who has the fastest 305?

And who said u can't do anything with a 305?
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Old 08-25-2009, 02:54 PM   #14
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Re: Who has the fastest 305?

Nice, and you still have some weight reduction you could do as well. Nice run.
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Old 08-26-2009, 07:33 PM   #15
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Re: Who has the fastest 305?

It depends on exactly how far you want to go for weight reduction. My car now sits at 2860lbs "race weight" without me in it and I still have the stock"ish" suspension and iron heads on it. I can't wait till I get the coilovers/tubular frontend and put the ZZ4's on. That should put me in the high 2600, mid 2700 range. Hell if I could find one I'd drop in an LS1 and shave off that extra 150lbs I keep hearing about,lol

I'm still tuning in my car right now and I'm getting alittle better at it but from what the EBL is telling me I should be in the mid to low 13's. I'm now working on my WOT .I know the biggest thing I do have going for me is the weight advantage.
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Old 08-26-2009, 09:58 PM   #16
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Re: Who has the fastest 305?

86Iroc2try- I love your tow rig, primer and stickers rule! You need a push bumper about 2' wide with old snowmobile track on it for rubber, and some old school lettering hand painted on the doors so it looks like the old push trucks push starting the front engine rails back in the 60's!

And I am proud to say the single pattern cam MW66Nova was using was a used comp 280H that came out of a core 406 I bought. Glad to see it lived on and worked well.
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Old 08-26-2009, 10:19 PM   #17
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Re: Who has the fastest 305?

eric! it's still living, the beastily 305 is back in my dad's car now, funny how that worked out, eh?
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Old 08-27-2009, 08:16 AM   #18
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Re: Who has the fastest 305?

so i went back to the track last night, first pass i went a 11.81 at 117 with a 1.628 60ft, i didnt use the nitrous cause my fuel pressure kept on dropping to 3-4 lbs by the end of the track, after that i started messing with the timing and only went a 12.01-12.3 on the last three passes. i have videos of all 4 runs, ill try to upload them
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Old 08-27-2009, 10:38 PM   #19
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Re: Who has the fastest 305?

I like your set up. 305 with T56 is not so common.
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