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I have 2* 253 and am makin 1 good engine out of both and was wondering if the valves out of the blue motors head will go into the red motor?
i will be doing a seat grind and valve grind but will it fit straight in after that?
Cheers Justin
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Remember there a non-pollution and pollution heads in the red area. Blues should be all pollution heads. Valves should be same across the board. Well in HQ & LH/LX they were. Why not get new seats and guides and go for slighty bigger valves with ULP safet
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Have to disagree. You should never fit bigger valves to a 253. The valves are sized to suit a 308, and even a very lumpy 253 won't need as much flow as a stock 308. All you will achieve is a loss of torque. |
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Bigger valves in a 253 can also foul on the cylinder walls & require reliefs which lowers compression - a backward step! |
Cheers,
Mick
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thanks for the info it was helpful but i was also wondering if any1 knew the valve grind angle for the valve and the seat for a 253 out of a HJ because i thought i would clean them up and give them a grind before i put the engine back together.
cheers Ju
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valve face angle 45deg
seat faces in head 46deg
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Disagree on the above ! If 253's cant take bigger valves why did Yella Terra make a GAS head for a 253/308 RED ? It has larger valves than bog standard, and its says THEY DO NOT FOUL the cylinder walls or pistons. Obviously a STAGE III racing type would b
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The gas heads are fine because they have the small 1.810 valves. The larger valves are 1.94 and as mentioned can cause fouling problems in the 253.
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