mderoy340
Well-Known Member
I'm still fine tuning my combo and I'm going to install a 4 hole 1" spacer. Anybody seen a 60' improvement adding a spacer. I use an AFR gauge so I'll make a jet change if needed to keep my 12.8 WOT.
Depends on a lot of things. A 4 hole will usually give you a little more bottom end, but it's really build defendant. For instance when I built my 408 I used an Eddy air gap and I tried a 4 hole and an open spacer to look for improvement and it liked the open better. That's typical with a larger cubic inch engine as they can use more plenum volume than a smaller engine.
BTW: I assume you must be using non-ethanol fuel for 12.8 to be rich enough? I can't get anything (at the pump) that doesn't have ethanol in it so it like an afr of 12.2-12.3 the best
I'm still fine tuning my combo and I'm going to install a 4 hole 1" spacer. Anybody seen a 60' improvement adding a spacer. I use an AFR gauge so I'll make a jet change if needed to keep my 12.8 WOT.
Nice360 Magnum, 904 low gear set, 3.91, 27" tire, 90* humid day, [email protected]
That's the spirit!I guess I'll try both and see what happens.
360 Magnum, 904 low gear set, 3.91, 27" tire, 90* humid day, [email protected]
I guess I'll try both and see what happens.
ran a 12.138 109.71mph with a 3/8" 2 hole. Next trip I'm going to try a 1" 4 hole.
Did you run it before you installed the spacer? If so what did it do?
iv just got a 2'' single hole, which im going to add to the 1'' i have (so 3''total) on a M1 hi rise air gap manifold
my guessing it will bog off the line, anyone tried this?
I'm still fine tuning my combo and I'm going to install a 4 hole 1" spacer. Anybody seen a 60' improvement adding a spacer. I use an AFR gauge so I'll make a jet change if needed to keep my 12.8 WOT.
4 hole spacer is usually used as a crutch for too much plenum volume or too big a carb - improves the signal to the carb.
The HVH increases plenum volume.
Not all 4 holes are reverse ball milled though. That was my point.
The one I posted works.