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2G Difference in 4g63 and 420a heads? I have searched.
Hey I am curious as to whether or not the 4g63 and 420a exhaust ports are identical or not. Does anyone have the exhaust port specs for the two heads to prove a header swap is possible or is my plan a bust?I’m reviving this ancient thread because I can’t find a 4-2-1 style header for the 420a...- 1500_gsauto
- Post #7
- Forum: Cylinder Head & Short Block
