Moparts Tech Archive
Spacers & Insulatorswhat will a carb spacer do for me?
will it help me? i have a 440 9.5 comp .517 lift 235 duration cam, edlbrock performer rpm intake, 950 holley hp 2in headers and 3in exhaust. heads are ported 2.14in 1.81ex 452`s. 391 gears 4 speed. should i get a 4 hole or open?
If you want more low end get the 4 hole, if you want more on the top try an open spacer.
Hey, I just installed one. It's a ported (4 holes) 1/2 inch spacer and a ported 1/4 insulated gasket for a total of 3/4 inches. It made a big enough difference to feel it in the seat of my pants. Throttle response is much better and low end is improved
LA W2 Bird
Spacers with 4 holes will be good for you.Try it out they work.I picked up a tenth with a 2".
I have a dual plane intake and ordered a 1" spacer from Edelbrock, and they sent me what looks like an open spacer with a single wall down the middle, splits the opening in two. Is that going to help? I've read the 4-hole/low end, open/high end.....is this some sort of compremise? Thanks for any info.
WHICH CARB SPACER IS BETTER??
I HAVE A 340 BORED .020 OVER STOCK CRANK AND RODS WITH 10 TO 1 COMP MP .508/292 HYD CAM, X-HEADS PORTED AND POLISHED WITH BIG VALVES, A M-1 SINGLE PLANE AND A 750 DP HOLLEY..727 WITH A 8" 4200 CONVERTER AND 4:10'S..I NEED SOME MORE BOTTOM END AND SOME PEOPLE SAY TO PUT A CARB SPACER ON..NOW 1" OR 2"...OPEN OR 4-HOLE..ALUM OR COMPOSITE??..HOOD CLEARANCE IS NO PROBLEM CUZ I HAVE A 6-PACK HOOD ON MY DUSTER...THANKS FOR ALL YOUR HELP
PLEASE TURN YOU "CAPS" OFF!!!
Experimenting is the only way to know what works best/will do what you want it to do.
Open Spacers Increase Plenum Volume (usually a Good Thing). 4-Hole Spacers tend to Improve Low-Speed Torque and Throttle Response.
If you want to go for bottom end then a 4 hole is the way to go. A 1" 4 hole is a good setup for an open plenum intake. We have had some great results with the new Super Sucker carb spacers. If you have the hood clearance I would run their 2" spacer. They are pricey and start at about $85 but I also have not had anyone who was not happy with them yet. Plastic or composite are OK and good for heat barrier, but generally warp over time or extended use. Aluminum ones are good street/strip setups but tend to cost more. If you want to try some stuff out by some cheap plastic ones and when find what you like then buy a good one. I'm hoping to get some dyno numbers on some stuff soon!
Wood works fine. I have made several from CDX and they hold up just fine.
I have done a lot of trial and error on my combination.stroker 416 with ported standard eddies,also have a number of buddies who race smallblocks.as a rule 340 motors need bottom end help.i agree with ben.a 4 hole would probably help your combo most(2 inch)on a bigger high compression motor an open spacer will really help down track.my combination big inches,challenged head flow likes the one inch open next to the intake,with a 4hole on top of it.probably tried 20 combo's and that works best.good to see ben playing with the super sucker.started trying them last year.best 4 hole spacer i have used to date, b3
Who makes the 4-hole super sucker and where do you buy them ?
pro-max and hensley that i know of.worth finding in my opinion b3
good question mike have just about the same set up in my son's chally a little bigger cam 305/525 but less compression not a good combo. think im gonna try a 4 hole Ben does the spacer come with studs and hardware?
HEY QUICKTREE interesting.my little bro has that cam in his 66 dart,904 8inch convertor,340,456 gears.goes 12 flat usually.btw stock eddies.keep telling him until he gets some compression or a smaller cam it wont go any faster.just not a matched combo.
thats right b3 we only have 410's have just put a 8" turbo action converter motor just don't have enough compression for the cam to work is not making any top end hp. just got the car a few months ago so haven't figured everything out yet trans could be slipping in 3'rd has everything to run 12's easy. but can't get out of the 13's
quick-- to give you an idea of the performane potential that cam has(really surprised me)my brother bought the cam/heads/intake from my buddie for 1200 with roller rockers ect(good deal).on bob's 71cuda (360)at 12.5 to 1 8inch convertor 4.56 gears,727 went consistent 11 teens,so tell your kid when he gets it sorted out he has a firebreather there!!!!!!!!! b3
yep he just turned 16 i just bought the car for him. nothing i hate more than go behind someone and try to figure out what they've done we put the cam in was told it had 11.1 pistons.i should have know better when the pistons were down in the hole a bit. i have never messed with SB always been bb the guy had a flat tappet cam with hyd lifters go figure. think im gonna try a 4 hole spacer to see what it does. prob will change the pistons i could still see hone marks on the cyl walls so someone has recently built it.
Hey Quicktree, sounds like a bunch of excuse making to me!!! With a full fiberglass bodied car, $1000 converter, $1000 ignition/carb set-up, and all the other goodies, that car of yours sure sit on it's face!!! Ha!Ha!! (a little payback for some of your comments on my posts!)
thats ok it will be setting on the back bumper soon and i'll come over and push that r/t down the track into the 12's lol
I've tried a bunch of 4-hole spacers. The last change I did was from a 1/2 4-hole to a 1" 4-hole. Bottom end is great with those 4-hole spacers. I lost top end as I went to the 1" . I'm doing this on a 440 9.8 to 1
no stick with the 4hole on a dual plane. you will create a turbulent air pocket not good for anything. teh 4 hole will give you enough extra volume.