Thumbing through some of my old car mags lately i've noticed one popular combonation was a 375 Chevy. Everybody knows about the more modern 377 cubic inch Chevy using a 400 block bored out .030 with a set of bearing spacers and a 350 chankshaft but most of these magazines are from the mid to late 60's and if i recall correctlly the 400 Chevy did't come out until 1970. I've done a search and found lots of stuff about 375 H.P. 327's and 396's but nothing about how to build a 375 inch chevy.
To me a 375 chevy is a 375 HP 327. It had 202 heads 30-30 cam pop up pistons ,fuel injection. Factory 375 HP rating. With a Z28 intake and carb. It was a 365 Hp.
So far i've found two more articles that say Jack Merkel's Willys had a 327 with a stock 4" bore with a 3 and 5/8 crankshaft and Ohio George Montgomery had a 4 and 1/16 bore and a 3/8 inch stroke crankshaft in his willys.
364 cubes for Merkel. The Ohio George engine a 376 if it's 1/16" overbore. But if it's really .060 overbore then it's a 375.
Ooop! Your right i went back and looked at the article an Merke's Willys again and it is a 364.Theirs another interesting Q&A article a few pages later in the same issue RODDING &RE-STYLING (March 65'?) on how Merkel beat Ohio George with the smaller motor.
This ^^^^^(mostly). Except to clarify; the 1965, 365/327 had the "661" intake and the Z/28 (302) which came out for model year 67 was a "610" intake.
Sorry,my bad the article i was referring to was the Nov. 64' issue of RODDING & RE-STYLING with the Lutz N Lundberg anglia in it which also had a 375" Chevy build by Jack Wheeler and was also 4 1/16 by 3 3/8.
yes the early factory aluminum high rize intake had a right angle on one of the intake runners. The Later Z28 intake was more streamlined it resembles a Edelbrock C4B intake.
IF someone mentioned 375 Chevy to me, I'd be thinkin' the fuely 327, or the top dog 396. But I'm not wired to the mul***ude of cu.in. combinations that racers come up with, other than the obvious ones.
We have a Dart 4.125 block. (Std for 400) with a 350 crank , which is 3.480" making it a 372". Now it's a 4.135". CP Pistons has pistons off the shelf at 4.130" 4.135, 4.145, 4.155, 4.165. All for 6.125" rods. What's your cubic inch pleasure. They make them all.
What i've learned from the 352 Chevy thread. http://www.jalopyjournal.com/forum/threads/what-about-a-352-chevy.955620/#post-10750549 is that a 5/8 crank is 3.625 so if the bore is 4" you get a 364 Chevy BUT if the block is bored .060 over you get a 375.4 inch engine. I asked a machinist buddy of mine one time, how many thouusandths in 1/16 of an inch? He said 62.5 if thats the case the bore would be 4.0625. when you plug that into the formula for engine displacement you get 375.9 which is closer to the 376 @squirrel says Montgomery had
Yup, there is a bit of confusion, because they used to talk about bores and strokes in fractions, but oversize pistons are usually sold in hundredths of an inch oversize. So if you say it one way, it's 4.0625, if you say it another way, it's 4.060, and the difference in displacement between the two is about half a cubic inch. The difference (after rounding) between a 375 and a 376. I don't know if they sold pistons as 1/16" oversize, or .060" oversize.
I did a thread on this very subject a few months ago http://www.jalopyjournal.com/forum/threads/conversion-chart.1005146/but never really got what i was looking for.
If ya do the math a 283 bored .125 over it comes out to 301.59 so when Chevrolet built one they rounded it up and called it a 302. Okay, end of discussion.
Back in the early 70's you could order a 302 fitted block from Chevrolet that came with pistons and rings. A 283 Crank, and set of rods and you had your 301/302 short block for not much more than pocket change. The fitted block was under 300 bucks at the time if memory serves right.
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