Autolite 4100 1.08 Vs 1.12

65-Fstbk

Active Member
May 20, 2007
280
13
29
Vancouver, B.C. Canada
Guys I need your experience....

I am thinking of using a bulletproof Autolite 4100 on my motor. I know the 1.12 venturis were typically used on the big blocks and hi-po 289's whereas the 1.08's were used on the smaller displacements. Ratings are supposed to be 480 and 600cfm.

Do you think a 1.12 would run well on my motor:

Converted 1987 5.0HO roller block - stock bore/pistons
Weiand Stealth manifold
ProComp alum heads
Comp Cam 281HR
5 spd trans
3:55 rear
Street car

Or do you think the 1.08 would run better?

Thx.
 
  • Sponsors(?)


Fstbk

Member
Sep 7, 2010
215
2
19
The 4100 on my 289 is perfect, but it's the smaller one.
It feeds a mild cam with stock heads but my crank is a 302 and I'm .060 over so I'm roughly 310 CID. I set my secondaries to work a bit more mechanically and when I hit it hard it can break traction when they kick in. I love these carbs, it feels as crisp as my last fox with efi.
 

rbohm

SN Certified Technician
Apr 12, 2002
6,698
550
204
62
tucson,az
to the OP, go with the 1.12 carb on your combination, it will work just fine.