I am building a new engine for my 93 sub 4x4 and could use some advise. I
purchased a engine out of a 89 van casting number 10054727 and am going to
build it to replace the exisiting engine. My main goal is to get more
pulling power for towing my trailer. I want to get about another 80-100 hp
over stock. I have talked to Summitt and they are telling me I should put
in one of their rebuild kits to bump up the compression to 9.73 to 1 and
then install aluminum heads with 2.02/1.60 valves. They also strongly
reccomend an aftermarket intake.
Anybody out there got better advise? I kind of feel like they are telling
me this just to get me to buy alot of parts not necessarily the best way for
me to go. I will do what they say if I have too its just alot more $$ than
I really want to spend...
Any advise would be appreciated.
stay away from the big valve (2.02) heads, while being great in a car or
other light vehicle, they hurt low end torque production, which is what your
truck needs. if money is an object, go to the junk yard and find a set of
vortec heads, they are 1.94's that flow infinately better than the sucky
heads the TBI's got. you'll need a GMPP TBI for Vortec heads intake ( I
think Edelbrock also makes one). add a good set of headers (Thorley Tri-Y's
come to mind) and you should be at least 1/2 way to your HP boost. anything
else is going to cost alot more.
if money is no object, buy the edelbrock performer package (heads, intake,
headers, SFI conversion, cam). Edelbrock's been around along time and is
very reputable. they claim an 85HP gain.'
I think thats a little high on compression... you certainly want to
be able to burn regular street gas.
The concept with truck motors is to go with torque...
So the idea is to make your power in the lower rpms
where possible. I would get an eldebrock performer intake (they make
one for TBI) I have one on my 92 K1500 pickup... You would more than
likely be fine with a good set of heads with smaller valves, what
you'll need to watch is that your heads match your intake... You just
can't swap in vortec heads without the right intake manifold, and then
it has to match your fuel system too. Go with a mild "torquer" cam...
there are a number of people who make cams for truck applications.
Overall your best bet is to stay milld on the compression, spend your
money on the heads and some good forged pistons. Keep in mind with
engine building its a team concept. A set of 3.73 gears would also be
a good idea in the rear end. Torque is genearlly made in the lower
On Fri, 1 Aug 2003 20:39:31 -0500, "Pat Vickers"
I will agree with doc that with 9.7 you will get better gas milage running a
better octane. And I know quite a few 4x4's that are pretty high
compression. a buddy just finished a blazer with 13:1. of course he will
never be able to afford to drive it on the road it does great at mud drags.
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