This means the same heads will fit, but a 302 head will need to be drilled out to accommodate this if it’s being used on a 351. PCM 351 and GT-40 heads Discussion in 'Mechanic's Corner' started by irvette, Jul 26, 2005.The 64CC version (X303 and X306) was used on 302s and the 58cc came on 351 crate motors. 845" SBF performance intake valves are a great choice for GT40P, GT40 and 351W engines. There are 4 different types of GT40 head.These heads have been remanufactured using refaced reclaimed Factory Valves. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Supposedly the GT-40p are a little better out of the box, but they have an odd spark plug angle that makes fitting headers/manifolds/exhaust a bitch.Since a lot of electronic things are required to work with the computer i was wondering what sort of special things i DESIGNED FOR NON EMISSIONS 289-302-351 FORD WINDSOR ENGINES THESE DIRECT BOLT ON HEADS DELIVER MAXIMUM PERFORMANCE IN THE 1500-6500 RPM RANGE. 285 HP, Long Block, Assembled, GT40 Cylinder Heads, Ford, Each. The lightning cam functions with the speed density system and 24lbs injectors. Production heads like the GT40's and GT40P's. New Ford 351 with GT40 heads overheating at idle in water.The flow of a water was similar to that of a water hose at idle. You loose compression going with the bigger chamber. 8 Cylinder Engines - Gt40 heads on 351w - I'm looking to squeeze same extra hp and torque out of my 96 351w e4od transmission.
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