Quote:
: I think the heavy foot has a lot to do with it
: as well as that lumpy cam! My car is pretty
: mild. 63 Valiant 225 with MP.436 cam, mildly
: ported head, 9:1 compression, Dutra Duals,
: and the Offy 4bbl set-up. I have a 904
: pushbutton with a shift kit and stock
: converter. With 3.21 gears and 235/60/15
: tires out back, this car will not burn any
: rubber at all! That's OK - no need to spin
: my wheels. So it's not the fastest off the
: line, but very fast accelerating over 40
: mph. It out performs a stock 225 1 or 2bbl
: easily, yet still gets 23mpg highway/17 city
: if and only if I keep my foot out of that
: Holley 4bbl.
: I'm thinking of replacing those big tires with
: 205/60/15's to match the front. The
: difference in height between the 235's and
: 205's is 1.5 inches. That may help low end
: performance a bit (and may hurt highway
: mileage). Any comments on that would be
: appreciated.
:
: Thanks,
:
: Pete Vanderlaan
Well, we have basically the same setup, but I have a manual trans so I got get off the line too And the tiresmoke through second. I have a tiremachine, and a bunch of good used rubber). I had 293's in the back (but I blew out the spiders) and it got the same readings ie. miles/gallon as it gets now off the guages, but hte actual millage has gone down (by the road signs). I think an overdrive will fix it, or something in the 320's. I have a 355's right now. Mine is also a 63 valient (do you ahve a spare hood for my bondomobile??) also dutras toy, one of dougs grinds according to calcams, also about 9:1 mildly ported, forgot to gasketmatch, (in a hurry as usual) I am running a 2 1/2 single pipe joined at the bellcrank from 2 2" pipes off the manifolds, a glasspack and a 2 1/4 turbomuffler, so I might not have enough back pressure (like if any) but it got better after I put on the glasspack last week.
What pipeage do you have?
I have also been having 390 issues which seem to be mellowing (perhaps it was the glasspack) there was a dead spot between idle adn primaries and a fat one between primaries and secondaries. now it rolls on better. Maybe hte thing is cleaning out after the rebuild (I have had that happend, maybe time for redline)
As far as yoiur tires go, I try to always run the same size on all five tires (yes I can count) so I can get maximum (for me) life out of them. Bet you spin those 205's! You have a huge contact patch with the 235's, so it's not just the torque difference, it's a reduction in grip patch.. I have 195's all round right now (hell, they were on the rimms from the wrecking yard, and they were new!) I did have a harder time smoking the 235 60 14's, but I could do it , even with the 2.93 rear end. (snap)
I will let you guys know how I do with this tank o gas. ( lord give me strength or a block o wood under hte pedal)
richard-c@e-d-a.com