c.ratio.

[3.4orNothing]

when changing heads in a 3.4 for a 3400 your comp.ratio goes way up,,so they recomend using the 3400 pston too,,,but what about modefieing the combostion chambers of the same stock head,,(ofcourse ported)

[vanbibber]

Re: c.ratio.

youre better off just changing the pistons from what i understand.

[tkoforpresident]

Re: c.ratio.

when changing heads in a 3.4 for a 3400 your comp.ratio goes way up,,so they recomend using the 3400 pston too,,,but what about modefieing the combostion chambers of the same stock head,,(ofcourse ported)

your not gonna lower the CR much just by workin on the stock heads


get the right pistons, or do the 3500 swap which has compression that is OK with stock heads with a tune.