Thread: stroking a 305 engine
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12-12-2009 08:21 AM #1
stroking a 305 engine
I know if you bore a 305 chevy engine out .030 and use a 3.75 crank from a 350, you'll get a 334 inch engine but still because of the small bore it's not really feasable. on my 305 I bored it out .060 and have a 3.75 crank that I can use and was wondering what size this would give me. I have to much $$$ in this engine and it runs great and with the new heads I increased the rear whel HP by 30. Just and idea I'm floating around.Keep smiling, it only hurts when you think it does!
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12-12-2009 09:37 AM #2
305 and 350 are the same stroke. 305 30 over with a stock 3.48 crank is 310 cu. 305 30 over 3.75 crank is 334 cu, 3.75 crank is a 400 and used to stroke a 350 out to 383
305 60 over 3.75 crank = 342
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12-12-2009 09:43 AM #3
But what size would a 305 bored out .060 over to a 315 with a 3.75 crank be?Keep smiling, it only hurts when you think it does!
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12-12-2009 01:44 PM #4
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12-13-2009 07:38 AM #5
Dunno why you want to spend a whole basketfull of cash to wind up 8 cubes shy of Granny's Malibu grocery getter.
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12-13-2009 08:06 AM #6
Why not!!! I've got the engine, the crank and all the other goodies I will need. Won't be spending much $$$ on this project and I'll have a engine that will be around 340HP and torque which is all I want.Keep smiling, it only hurts when you think it does!
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12-13-2009 09:15 AM #7
Sounds like a good idea to me, especially if you already have everything...Sure a 350 with the bigger stroke would produce more power, but if what you have is in good shape, why not use it???? Doubt you're planning on doing a huge number of all out assaults at the drag strip anyway!!!!Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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12-13-2009 10:30 AM #8
Dave my time before my new heads was 103 @14.3. With 30 more hp and torque and a stroke engine I should be able to get in the low 13's with a 3,000lb. truck. Don't plan on racing it much, just a few times this summer as I spend most of my time crusing. A good friend of mine and I are building a 60 chevy Impalla with a 454 engine putting out 580 HP(estimate). Both of us are a little short of money so it's going to take awhile. He's got the shop and I have the welding equipment and Plasma cutter and tools, but were both retired and living on a fixed income so we do what we can when extra money comes in.Keep smiling, it only hurts when you think it does!
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12-13-2009 11:09 AM #9
Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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12-14-2009 11:53 PM #10
305 power
Just build what you got and have fun. You can build power from a 305 i am getting 400 dynoed hp to the rear tires and 440 tq on my 305 that sports a nice hydralic roller cam, ebay 80.00 trw forged pistons moly rings and eagle lightweight i beam rods. Crank is stoke but i spent hrs on it profiling and polishing it to the same profile as a eagle dragon slayer crank.
The best part is that i was doing the local 1/8th mile here in snohomish and it was pulling 7.51 and looking for more.
Oh did i mention she spins easily to 6400 with the vortec heads and open plenum aluminum high rise with a nice reground hydralic roller cam. It is running 6 psi of boost t4 turbo love. Best of all was when i took my first place trophy position and when i had 20 or so people looking to see what was under the hood since i race for the last 4hrs and never popped the hood. When i popped the hood the eyes ewwhed and ahhhed and ask what engine it was 383 or a 406? I BOASTED that no its a 305 with vortrc heads and they couldnt beleive it. She now has the boost cranked up to 11 psi and i drive it daily. I built the engine for 20psi of love and will turn it up more after i instal the seconf electric fuel pump to keep the fuel to it. Got video of the races of me whooping up on modded wrx`s ,Mustang cobras,2006 vette with slicks, even v8 s-10 and chevy luvs. Oh that 454 open headers thought he would take it when he got me out of the whole.But she pulls hard and i drove right on by him full truck length
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12-15-2009 05:00 AM #11
would overheating be problem with a .06 ovedrbore on a 305? or is there still plenty of meat between the cylinders?
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12-15-2009 05:22 AM #12
I've never had the engine run more than 180 degrees and when it's sitting at a light or slow traffic my electric fans kick in and drop it back down real quick. .o6o is about the max for a 305.Keep smiling, it only hurts when you think it does!
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12-15-2009 06:40 AM #13
thanks, I've always been too nervous to go over .03 but my engines have all been cruisers
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07-03-2010 12:48 AM #14
Sorry to resurrect an older thread, I am possibly the only 305 loving car enthusiast on the planet. I grew up with them in the 80's when mom bought them new. Now I have a nice 85 Camaro Z28 survivor with a TPI 305 rated at a measly 215hp/275tq. They make meaner 4cylinders these days so I am extremely interested in your findings Cadracer! I am wanting to stick some 062 or 906 Vortec castings on the 305 bore. It has flat tops from the factory and I am unable to find anyone who has done this to let me know if milling the heads will be okay? All I see is speculation. I am guessing your heads are 64cc because of the turbo but I figure that would be an awesome set-up to do as well. I would be more than happy to stick an intercooled procharger on there and get to tuning it out on a dyno. Please, tell me more about your engine!! Thanks, this is REALLY important to me!
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04-19-2015 12:13 PM #15
Well I've sure gotten old too so don't worry about it! I've had two bypass surgeries, new knees, fought prostate, cancer and diabetes. I'm half blind, can't hear anything quieter than a jet engine,...
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