Apr 1, 2008 · The 4AC pistons are a lower compression piston, and you will notice a significant difference in power due to this compared to a 4AGE lower end, but they will not hit the valves …

Jan 2, 2007 · But if your wondering an ae86 with a 4ac has the same manual transmission (t50) (unless the sr5 is auto!) as the gts 2006 Ford Ranger 1989 Corolla sr5, 4af, 1990 gts seats, …

Jan 25, 2004 · The head shaving and porting will give you another probably 5hp to the wheels at most.. Don't make the intake ports any bigger just roughen the surface area up.. and if you …

Apr 13, 2017 · Evidently all 4A heads and blocks are of the same bolt pattern / interchangeable. Some have fitted 4AGE heads on 4AC blocks evidently no problem - they virtually bolt straight …

This is the introduction to one of the most technical series' I'll ever done. Explanations on how a head works, how to change it to better performance, and c...

May 15, 2013 · A mild cylinder head porting can unlock response and motor will breathe more efficiently, unlock power. A full port/polish on any head will make a significant difference. A 3 …

Aug 20, 2012 · keep the head for the 4ac. The 4ac head has larger exhaust valves I think, and that means larger ports too. You will have to swap over the manifold and carb I believe, they …

Jul 31, 2015 · Well, if you're going to do that, I would personally start with a 4af block, which should be the stronger block of the later years. You can tell by the number of ribs on the side. …

Apr 2, 2020 · note the edge of the head is wavy, this is the last iteration of the 4AC head in the USA. Its difference from its first generational "brother" is MORE substantial, then a Blacktop …

Hasselgren Engineering has teamed with Acrokin Engineering, Inc. to develop an improved version of this popular head. The design offers improved reliability, better performance and …