4ac

[deadkelly]

what sort of cam lift can i put into a 4ac motor ? i have a 4ac in a ae 71 83 carolla it has towing gears ,( will check diff ratio on weekend ) & a 3 speed auto that shifts hard ( really bangs into gear & has done since my mate got it about 7 years ago ) the engine was fully rebuilt 3 1/2 years ago with new acl pistons + 1mm over . the head was mildly ported ( just cleaned up / deburred casting flash but lightly ran over entire port with burr then finished with tape )

i have a rebuilt 32/36 webber carb & adapter plate & new air cleaner .

if i regrind my cam for more top end & use a stall covertor & extractors what sort of hp could i expect ???

& how much does a 4ac have std ??

if i do this i'll buy the extractors first & install them

& take the car off the road over easter & do the cam & stally & carb @ the same time then get it tuned hahaha .

i only expect 20% power in crease & any more would be a bonus . ( i can feel when the porting kicks in mid to top end haha )

over time i will put new shocks in it ( maybe lowered springs ) & respray it & tint the windows . it's just my A 2 B car ( btw it has a kick arse stereo )

it also has a super trap muffler with 2" exhaust .

cam spec's lift & duration ??? what can i get away with ?? thanks guys

[mikey_m]

Ring Crow CAMS, they are veyr helpful on 03 9357 0469, there is a mild grind they can do on them . They no longer have patterns for new cams for the 4AC.

 

But they are cheap and very helpful, they will be doing a new one for me in the next few weeks.