Re: [BaadAssGremlins] Re: 360 Engine for the Gremlin

[crbacsw@xxxxxxx]

Thanks Dave! Plenty here to work with - very helpful!


-----Original Message-----
From: Dave Hoelcher <dhoelcher@xxxxxxxxx>
To: BaadAssGremlins <BaadAssGremlins@xxxxxxxxxxxxxxx>
Sent: Fri, Sep 21, 2012 11:48 am
Subject: [BaadAssGremlins] Re: 360 Engine for the Gremlin





The tiny "Performer" intake, & cam series is SBC tech applied to AMC, 
maybe fine for 290/304s, but 360s & up LOVE to breath. The 360 is 
already a torque monster with 390 ft.lbs, nearly as much as my NEW Hemi 
Challenger!  The 904 is the next best thing to a 727, and has less 
parasitic drag, so I'd be putting a looser converter in it while the 
engine is out...it's no weak trans, either...plenty of racers are using 
them instead of 727s...you are going to have basically a 4,000 RPM 
power band, with the upper 2k being where the peak is, if you dare to 
open up the inlet AND exhaust sides, 1-5/8" headers, also fine for a 
little engine, low revving car, but you lose a BUNCH over 4,000 RPM, 
right where these heads come on strong, I never use anything under 
1-7/8". Pick your peak RPM, I'd have to cast my vote for 6,300~6,500 
bursts, an extrusion-honed R4b or a Torker + 3310 Holley 750, big-tube 
headers, big tube exhaust, H-pipe. (My fresh 401 is get ting 4" exhaust 
& I'm building 2.25" stepped headers from a Hooker BBC weld-up kit & 
AMC flanges). Building yours for mid 6k bursts as redline, your power 
spread should start just over 2k. As long as your kickdown linkage is 
set right, you may be surprising some Hemi Challengers, Camaros, 
'stangs, etc...Isn't THAT the goal?  I'd have to disagree with the 
dished piston idea & go for flattops with .045" piston to head 
clearance, that is how to avoid the ping, which dished pistons DO 
cause. Unshroud your valves, and set your compression ratio by chamber 
volume, not dished pistons. That .045" clearance is THE number 
throughout performance engine building, cars, bikes, 2-stroke or 
4-stroke. except when using aluminum rods, which need more clearance 
because of thermal expansion. Especially since you won't be putting 
that many miles on it, why not go for the gusto? You can sell that 
Performer stuff to the Jeep guys for trail riding, it's what they us e 
for their low RPM putting up hills.  Gotta go....




  


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