Technical How Do You Build A 342 inch Chevy?

I was reading some old magazines I bought off fleabay tonight and came across an article where a car had a 342 cubic inch Chevy engine in it, which is a combination I've not heard of yet, I have heard of a 341" inch small block that was in the GRAN-MA Willys but never a 342" inch Chevy. So I found my copy of Hot Rod Aug.02. Which has an article about offset grinding crankshafts and according to the chart a 341" Chevy has a bore of 3.766 and a stroke of 3.830. Unfortunately I can't post the chart because I just got a new computer and all my scans are "in the cloud" and I haven't figured out how to get them out yet. Anyway I was just wondering how one goes about building this combination.

 

Sounds like a slightly bored 265 with a stroker crank to me.

 

A 3.766 bore would be a 305 bored .030 over but the didn't build those in the 60's so....?

 

Thats why I said the 265. It has a 3.75 bore stock.

 

396 destroked so he could run in some cubic inch class...?

 

@irishsteve The article was from Jan. '64 so I don't think so. It was a Sports Car running a "B" class engine on the salt.

 

Crunching the numbers with the calculator on my phone reveals a bore of 3.770 and a stroke of 3.830 would come out to 342.028 which would only be a .020 overbore on a 265 block. Question is would a 265 be able too take that much stroke?

 

265's and early 283's are difficult to stroke [not impossible].
Later 283's have the lower bores scalloped so they can take a 350 crank with the mains turned down.

A 0.60 over 283 [= 3.935 bore]
Turn down the mains on a 350 crank and offset grind the rod journals to small journal size and 3.515" stroke and you get 342"
Or weld an early 327 3.25" crank and stroke it.[or 283 3.0"crank]

 

327 + .060 bore + .030 offset = 342.64"

.

 

In the late 50s SCAT fitted a modified 289 Studebaker crank to a 283ci SBC

 

Bump. for the morning crew.

 

Seems to me the guys with the Yesterdays Child '56 Chevy have a 352 inch engine built with one of these crankshafts in it.
https://www.jalopyjournal.com/forum/threads/what-about-a-352-chevy.955620/

 

.060 over 400 with a 262 crank gets you there

 

I have always thought that when you see those odd numbers for engines that it was done to confuse the competition. Put a odd number out there and everyone will spend a bunch of effort on the cubic inch number and think that is why the car is winning, not that the guys have have the best combination of parts thru out the car.

 

@mgtstumpy my bad I just re read the article and the @Panneton Bros. Racing '56 Chevy did use a 289 Studebaker crankshaft but the guys at C&T welded it up too make a 4" stroke for a 4"x4" inch 402 inch Chevy which is another thread I started a few years ago. https://www.jalopyjournal.com/forum/threads/402-cubic-inches-from-a-283.1004739/

 

Doing a little more engine math with my trusty smart phone a stock bore 283 (3.875) and the 3.652 stroker crank it comes out perfectly. 3.875x 3.625 comes out to 342.00 exactly! But since you won't find a 283 block with a stock bore anymore your best bet would probably be to bore a 283 or 307 block out .060 and use a 3.515 stroker crank like @Mimilan said because it comes out to 341.976 -OR you could you could use a 305 block and bore it out .030 to 3.766 (3.736 is stock) like the chart suggests.

 

In 1959 you could buy a balanced strker kit from the Don garlits speed shop to turn a 283 into a 352. so 342 from a 265 would have been doable in 64

 

Lie?

 

Stock bore 283 with a 3.625 stroke.. It will have some torque.

 

Your right as I recall all 265 blocks could be bored out to 3.875 so that would work.

 

Me and my buddy were going back and forth about my anemic 307 and he had this combo figured out for one.