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I did a 273 in my 67 Barracuda fastback back in 91 or 92.030 over TRW pistons with 318 High swirl heads(#516 I think and came out about 10:1) 1.88/1.60 valves,510/286 Erson solid,reused the stock adjustable rockers with new Prods,Holley single plane, 625 AVS and cheap headrs.

I reused the finned VCs with wrinkle paint and the original air cleaner that I modded and painted the motor Chrysler red.

904 trans w/stock histall and 3.91 gears

The car made really good power to 7K.I never dynoed or made a pass with it but it was a lot of fun and revved really fast.

Pistons might be hard to find now though



273four, thanks for the reply! sounds like your 273 was pretty strong! I'm unable to drive a 4 speed(bad feet) but if I could i always thought a motor like the one you built along with a 4 gear would be great fun to drive! But since this car has a TF, I wanna make alotta TQ down low and only spin it to 6k or so. max if thats doable and still get the HP(380/400) I want.



here's what I'd do...get a 360 magnum shortblock. reuse the crank and rods. buy either RHS magnum (iron) or Edelbrock magnum heads. run kb107's at 0 deck and a .039" head gasket. if the roller lifters are in good shape, reuse them. for a cam, I'd probably look at having bullet grind you a cam. I'd see if they can regrind the stock cam using their HR272/340 lobe for both intake and exhaust, which will yield ~.544" lift with magnum 1.6 ratio rockers. if not, I'd have them grind on a new core, using a 112 LSA (factory magnum is 114). I'd install the cam at 106-108 ICL. rockers, the RHS's you could use stockers, the eddies take small block chev rockers. either way, I think I'd use Scorpion Performance rockers for small block chev in 1.6 ratio. intake, I'd use an RPM air gap. carb, I'd use an 800 eddie thunder series AVS.

a little cheaper, if you can find a whole magnum longblock that doesn't have cracked heads, just use OEM magnum heads, but do a little work to the heads--the valve job is undersized, have it redone, opening up the seats to 1.9 and 1.6", with a nivce 5 angle valve job and a 75-80 degree throat cut to open up the bowls, do some bowl blending, and open up the pushrod pinch.

converter, I'd use a tight ~2500-2800 RPM stall converter-- something that will flash up when you stomp on it, but not have a lot of slip at cruise. a lot of people seem to have good luck with dynamic 9.5" converters in that regard...

I'd swagger this combo should run on 89-91 octane, probably idle in gear at ~750 RPM with ~12-13" vacuum, probably make conservatively 350-360HP/410-420tq, and probably net you 17-20mpg highway with 2.94 or 3.23 gears.

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)