Art-
Gotta agree with everyone else so far, 318's do not have thicker walls to support a 340/360 bores, you're stuck with at most a .060" overbore, and for high hp you should sonic check if you go that big.
As for the bolt pattern info its fairly well known. The Dakota V6's are just 318's minus the front 2 cylinders, and the modern hemi's are all LA block based (at least on the external dimensions). Pretty cool.
The Supra 5 speed (R154) I didn't know about. Very cool. Although I'm guessing the shifter location is pretty far from that of an A833, so it probably doesn't do much good for a Mopar application.
> . Yes presmog, 74" Jensen Healy. With 3.31" stroke steel crank, I suspect over 6,500 rpm. will tend to be limited by dual plane vs. a M1 single plane ? Motor will be dyno'd prior to install.I suspect,Jeg's 1 5/8" od. primaries, hedders may tend to limit over 6,500. Car will have a 26" tire and .78/1 in 5th., so I'm lookin for rpm. Thanks All, Art.:glasses9:
273 + R154 using a 3.9 bellhousing
Here's some links about the R154 for the curious...
http://forum.britishv8.org/read.php?6,15981
http://www.slantsix.org/forum/viewt...start=15&sid=999cf2a580e0582897e4700e211a506a
This is all going in a Jensen-Healey? Even without getting to 7k it'll be a monster. My old man used to run an Austin Healey resto shop, saw a few with 289's or SBC's. It's amazing what 300-400 hp will do in an sub 2,500 lb ride. A customer had a fairly mild 289 in a 100-4, that thing would flat out fly. Hard to drive actually, it would break the rear loose and spin 'em up if you looked at it funny. Have yet to see one with a LA smallblock in it, dimensionally they're a little bigger than the Ford's or Chevy's, so it may be a tight fit.
Good luck with the project! :-D