400's no longer have a piston that will attain a higher CR (only stock style are available). Trick Flow Specialties TFS-5161T005-C11 - Trick Flow® PowerPort® Cleveland 225 Cylinder Heads for Ford 351C, 351M/400 and Clevor Cylinder Head, PowerPort® Cleveland 225, Comp Port, Assy, 72cc Chamber, 1.56" Sp, Ti Retain, Ford 351C, Each 3. 4. Other Aussiespeed Performance Products for the 6 cylinder Ford engine is the range for alloy and cast iron head Falcon and Cortina crossflow 200 and 250 motors Ford 3.9 and 4.0L OHC Falcon sixes and the DOHC Ford 6 cylinder engine. Jan 19, 2014 - Precision Automotive Machining & Manufacturing 1,609 Posts . If you used 400 pistons in a 351M, the piston top would reach TDC at more than 0.3 inch below the deck surface and you would have a compression ratio of only about 5.5:1. As you can see from the chart above, the best head you can install on the 351M/400 is the Australian closed-chamber 302 2V head. Our cylinder heads and manifolds will blow the competition away! Discussion Starter • #1 • Nov 5, 2004. – 351 Cleveland Ford circle track engine: 4V heads, iron intake 550Lbs. They fit Cleve/M block with stock pistons etc. Stock pistons are too far down in the bore to gain any quench benefits from the closed chamber head. Modification of 351C pistons by modifying the wrist pins will work, but will created a shorted life for the rotating assembly. I am getting ready to put together a 400 Ford w/ Aussie Cleveland heads. Aussiespeed have a range for the Chevrolet inline 6 cylinder engine and V6 Chevy 4.3 litre engine. Cylinder Head Innovations (CHI) delivers championship winning Cylinder Heads and Manifolds, with proven quality and performance, available anywhere in the world at a price you can afford. Aussie heads are closed chamber and will raise compression ratio (CR) to around 9.5:1 or so. The Australian 351C 2V heads have a chamber size comparable to US-made 351C 2V heads, but the Australian 302C head has a very small 58 cc chamber (with some reportedly 62 cc). 2. Zero deck pistons, like the ones available from Tim Meyer, are mandatory to get the recommended .035-.045" piston to head clearance. Obviously, the 302C heads would substantially raise the compression ratio on an M-block, and probably by too much unless you use custom pistons. – 400 Ford: Aussie heads, aluminum intake A common mistake people make is to bolt a set of Aussie 302C heads on a standard 400. – 400 Ford long block, Iron heads 535Lbs. Aussie heads are sought after for Cleveland and 400M by performance enthusiasts mostly for thier closed chamber combustion chamber for higher compression. 1. However, these heads are EXTREMELY rare and … If you use a 351M piston in a 400, it will smash into the head because it’s top surface is … Just by bolting on this head, a 400 will develop 10.75 CR and a 351M will develop 10.12 CR. 440Lbs.
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