mderoy340 said

I ran into a good deal on some hughes 1.6 rockers and made the swap from 1.5 to 1.6. Car picked up .1 and gained the hp up top, 1-1.5 mph gain. The wipe pattern moved from centered to slightly up, toward the intake side.
My Comp XS274S SFT is to small for my head flow and the swap improved performance. The motor also revs quicker.

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360duster said

Hi,

i did the change from 1.5 to 1.6 Rockers some years ago, crane ductile iron 1.5 to mancinis version of the Harland Sharps. Car was significantly faster, two tenth. Could be influenced by track conditions or weather, so i think it was worth a solid tenth.

Michael

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