1988 AMC 360 going into the shop...

[scrible88]

My 1988 AMC 360 is going into the shop... for a full rebuild with a comp 268h cam kit. when the motor is done it will be buttoned up with the same edelbrock 750 carb that was on it before and I am adding a TFI ignition kit. Of course full dual 2.5 inch exhaust but with stock manifolds. Edelbrock performer intake. What kind of numbers should this motor push?

Also, I want to have the compression raised to like 9:something is this possible by having the top of the block decked to reduce the "squelch" (I think that is the term I've heard used for the distance between the piston and the heads) Will raising the compression help performance much with this setup? What is my stock compression? What should I have the compression raised to if it is possible? I would still like to run 87 or mid grade octane fuel.

Sorry for all the questions, I know this is the only place I would be able to come to have them answered!

:t:

[jeepsr4ever]

hmm could hit low 300's

[scrible88]

come on ya'll you know you guys want to answer my questions about the compression. :wink:

I'm taking it to the engine shop in the morning

[dbesade]

"squelch" (I think that is the term I've heard used for the distance between the piston and the heads)


Your thinking of Quench :t:

[AMX69PHATTY]

Beleive the term is "quench".

HP is a product of Torque and RPM.
A conventional cam has trouble making torque at both high & low rpm.
That's why new hi-tech motors have variable cam timing.
For a Jeep, low end torque is desireable, which is in conflict with making torque
at higher engine rpm's where it is needed to make high HP numbers.

I believe CR adds power and deck milling will add compression.
Don't know what CR was stock for an '88 360, 8.5:1 maybe.
Stock nominal deck clearance should be .012 but
all aftermarket cast pistons are .020-.030 shorter than stock,
so .032 deck clear with new cast dished 360 pistons.
Egge.com sells Rambler 343 flat top 4V or 8cc dish 2V pistons
which will give better CR than the dished 360 pieces.
Search here for a post by PaintedRat who built a 360 with the Egge pistons.
The Egge 2V's yield about 9.6:1 CR but are .043 down in the hole, bad quench.
360 dished top is 25-30cc volume, so assume 27.5cc and 1.581 Comp Ht
with a .032 deck mill and .000 deck clear and 58cc heads I get 8.8:1 CR.
There just doesn't seem to be available good cast pistons for 360's for 9.5:1 CR and .000 deck.
Unless of corse you order custom forged pistons made to your spec.
I come up with 1.601 Comp Ht & 17cc dish for 9.5:1 CR,
with no deck mill, stock .012 deck clearance, and 58cc heads.
If deck was milled .012 for .000 deck, then a 19c dish is needed for 9.5 CR.
I submitted a Request for Quote to Egge for 360 cast pistons
1.600 Comp Ht and 19-17cc dish, and they did not respond.
I should call them again about that.

Not sure what the CR limit is for regular or mid-grade gas.

From Kieth Black SilVoLites Piston site, what effects gas usage and detonation
is no Static CR, but Effective CR which is a product of
the Static CR and the Cam's Intake Valve closing angle.