Discussion in 'Street/strip 400/430/455' started by C.Rob, Feb 12, 2018 at 9:52 PM.
Just wondering since there are so many options on the 455 what sizes have guys made the 350 engine?
Chris we stroked Sonny's Tweety about as much as possible and got 366 using chevy rods. Cam gets in the way.
Chris, post Sonny, you can get nascar take outs(1.850" rod journal size) for pennies on the dollar that will yield a 370 CID with a .040" over bore and a 3.990" stroked sbb 350 crank!
If in you're interested you can PM me for more details.
I thought you had it worked out to get up around 380+, but is that where rod/cam clearances become very close? I love reading all your 350 posts. Taking notes.
Cool info. Anyone use rods with the 1.88” Honda journal? Can’t get 4.00” stroke to fit?
Thanks for the update
You can get 380 cubes with a block that sonic checks good enough for a .105" over bore and the 3.990" stroke. That's the hard part though, finding block good enough to over bore that far.
gsjohnny has been using the 1.889" rod journal size nascar take out rods for the last IIRC 5 years.
The 1.850" rod journal size doesn't really have under sizes so you can't go any further with the stroke, so 3.990" is it. The extra .010" less stroke is to make sure every journal cleans up.
A 4.00" stroke would work, even a longer stroke could be made to work with a billet crank, but custom rods with the Mitsubishi rod journal size of 1.777" would be a good idea to use for more cam clearance with more than IIRC 4.200" of stroke. Also with a stroke that is from 4.00" to 4.200" a 1.850" rod journal rod would work but should be no longer than 6.350" so the rod will actuate more at the parting line of the main caps as it rotates the crank to help keep the rod to cam clearance in check.
Good info. Never toyed with a 350,but I’ve thought about it.
Just thinking about a buddy who wanted to build a 350 and turbo it verses a 455 due to block strength. Thanks guys
I’m sure you probably have a Buick 350,or ten,but if your buddy needs one,I have one.