Re: 2.5 Iron Puke

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: "Bruce Hevner" <scramblr@xxxxxxxxxxx>
" 
" >btw that chevy four is still in production in mexico, in a 181-cube
" >version, for marine and industrial uses.  the 140-hp 181 has long been
" >popular in sterndrives.
" That's true and for a long while it has been used in lower class circle
" track racing. That's almost a 3 liter four cylinder! Same bore longer stroke
" (different pistons). Don't kid yourself those things CAN be made to run!
" There USED to be a good bit of speed equipment available right from GM under
" the "Super Duty" label. Even 4 bolt main blocks. 

original chevy 153 - 3.875"b x 3.25"s, same as 230 six, 90hp with 1bbl.
chevy marine 181 - 4.00"b x 3.60"s, 140hp with 2bbl.
pontiac 'iron duke' - 4.00"b x 3.00"s.

it was the poncho that had all the gm speed equipt.  it has
similarities with the chevy four but a lot of things are changed.
stock blocks are significantly lighter than chevy 153/181, things like
bearings and wristpins are smaller.

they all - chevy six included - have gear driven cams.  that's why the
amc six hei swap needs an amc gear - cams spin opposite directions,
distributors don't.

also, the 153 and 230 use 283 sbc pistons.  rods are similar too, but
wider on the big end just like amc 258 vs. 304/360 rods.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen

adh@xxxxxxxxxxxxxxxxx                       and think what none thought