Bought a 69 327 for $400 totally rebuilt.. looked and ran like it did.. he
said it was a "stock" rebuild... WELL !!! I pill the heads off.. 1.94
valves.. kinda a pisser but then see flat top pistons and 0.60 on em.. I
think damn....can't rebore it.. so I think positive.. it is like new inside
and clean as hell.. What size motor is this now that it is 0.60 and what is
the compression gonna be with the flat top 4 v relief pistons... I am not
teh greatest at this.. I just buy the stuff to stok for other projects(like
this motor is going in a 84 4x4 :) ) hanx for any advise
I was thinking it was 336.. As for the casting on the piston, ..sorry..
:( no casting on the piston just 060. I want to bring the compression down
as I am planning to run a turbo setup on this. My friend (as you did) said
he assumed it was 9:5:1 so by stcking heavy cast heads 72 cc heads on it
will drop the compression BUT he doesn't know the engine is 0.60 over
either.. I just found that out.. Have an idea what the oversize (other than
make it thin as hell :( ) will do to the compression if it is a 9:5:1
piston I thought it would bring compression up being over bored. ???..
thanx for your advice..
Depending on what casting number head you have they could have
different capacities in chamber in them and therefore different CR's.
1.94 heads are good heads and 2.02 heads are very rare and do not
really do much more unless you get well above 6000 RPM a lot. A few
words of caution here. First if those are pre 73 1.94 heads they have
soft valves and seats and will not last long in a engine being run
hard on today unleaded fuel. (they were designed for leaded fuel)
Second and most importantly if you plan to turbo or supercharge it
even 9.5 is too much. You really want 8 to 8.5 (even less if planning
10 PSI or more) if you plan to runs some boost with pump gas in that
motor because of detenation concerns. Under boost when you hear
serious knock it is ususally too late when you hear it and damage is
done as you can melt a piston in a heart beat under boost if you get
fuel knock. I would suggest that you look for some late model 1.94
heads with lower compression (bigger chamber) and with hardened valves
and seat that were designed for unleaded fuel.
The heads I have (1.94 1.50 ) are old but valves have been redone that is
why I am using them instead of the heads that came on it.., I was wondering
if the piston is 060 over does that increase compression ?.. or
Has it just had a valve job or have hardened valves AND seats been
installed? Yes a overbore will increase CR and in your case about
maybe .5. ALso it is not generally a good idea to bore .060 over on a
4 inch bore SB as it weakens cylinders and can have heating issues and
also now that I think of it, I defenately would NOT turbo or super
charge it with than amount of overbore as block/cylder walls could
crack or fail under boost. Boring .030 is safe limit to over bore on
that block if you plan to boost it.
thanx for the info. I bought some magic rad fluid... he says 10,000f :)
Some guy jack sold it to me so it should handle turbo now... I'll use this
in my truck minus turbo setup... Maybe I'll do the 302 sbc up for tuurbo..
it isn'r over sized yet.
A turbo charged old 283 would be sweet. You cold use 307 heads on it
to lower CR for boost. (you could even do a 307 too as they both have
3.875 bores and lots of meat in block and head for boost.
Good point, I remembered the forged crank but forgot about the pressed
on only damper on earlier ones. I had a 67 283 I put in a 72 4x4 truck
for a while (so I could keep using truck) about 30 years ago while I
was rebulding and warming up the 350 for it and it had a tapped and
drilled snout from factory. Not sure what year they started tapping
them as I have seen them both ways.
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