When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
most of the guys putting 400 to the wheels are fully ported heads with 11.0to 1 are higher.what are you shifting it at,cause i bet it is still making power at 6800 to 7100 rpm