Thread: stroking a 305 engine

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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.

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

But what size would a 305 bored out .060 over to a 315 with a 3.75 crank be?

Originally Posted by 53 Willys

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

I thank you for the info.

Dunno why you want to spend a whole basketfull of cash to wind up 8 cubes shy of Granny's Malibu grocery getter.

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.

Originally Posted by chevy 37

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.

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!!!!

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.

Originally Posted by chevy 37

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.

I know what ya mean man!!!! Seems anymore it takes me all day long to do what I used to do all day long!!!! But then, as we all know, gettin' old ain't for sissies!!!!!

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

would overheating be problem with a .06 ovedrbore on a 305? or is there still plenty of meat between the cylinders?

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.

thanks, I've always been too nervous to go over .03 but my engines have all been cruisers

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!

Is there a video of the engine. I have 305 that I already completed the machining new piston, cam the whole lot and I want to know what the outcome of this motot.

Originally Posted by Cadracer

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