jimh_1962

I bought a performer EPS 2703 from summit over the weekend. I am wondering if I would have any clearance issues with it on a 327 installed in a C1? Also, I went with the edelbrock 500 cfm carb.

I know I will have to have an adapter for the air cleaner.

Thanks!

Chicago Pete

I have the exact same manifold on my 65 with an Edelbrock 600.
Had to buy a super slim air cleaner to clear my small block hood.
With an adaptor the stock air cleaner would not clear.
Absolutely no help to you unless there are some similarities?

INMYBLOOD

You can look at the height of the manifolds on Edelbrocks web page. I used to run a performer and now the torker II. I know these clear with a 650 holley and a drop base air cleaner. There really is not much room. I think an inch to inch and a half above the choke.

jimh_1962

I bought an edelbrock 500 CFM performer to go with it. Hopefully, I will not have any clearance issues???

beatervette

Since you guys were mentioning the 2703, I was thinking about installing one myself. Did it make a noticable difference from your stock manifold? I have 300Hp engine.

Thanks

jimh_1962

maybe 301+ now!

BANG11

I have been thinking of buying the same intake but will use the Carter AFB with it. My motor is out of the car and won't be going for awhile, keep me posted on how it works out for you James.

tach drive 61

yes it will clear I used same one with oil fill machined out ala 283, I used afb as well edelbrock carb , the only trouble i noticed is when car is shut off it will boil any gas left in intake , bad fuel smell I have since removed that intake and started using the stock steel 44459 300 HP intake 65/67 no smell ! give it a try !

NOM61

It depends on how fresh your motor mounts are also.
I have a Performer EPS with a 600 cfm Edelbrock and it has been a bit of a hassle finding an air cleaner that fits properly. If my motor mounts had a few years on them instead of being new, the extra 1/8" squish would have allowed a 2" drop base cleaner to clear without having to modify the wing nut.
The Edelbrock carb also makes it harder to find a good drop base air cleaner. With a Holly the low profile Proform 3" drop base would work perfectly.
I don't have a factory air cleaner, but Stewart from Oz has one and had to make significant mods to get it to work.

DT

Stewart Allison

I have a 350 with a performer manifold and a 600 edelbrock carby and an original air cleaner. It doesn't fit I had to do some pretty severe massaging on the air cleaner base. I have asked the question a few times on here and there are lots of people running the same combo with a Holley and don't have the clearence problems. I guess the Holley sits lower ? Stewy

jimh_1962

Did I make the right decision to go with a 500 CFM carb?

I am going to install a comp cam nostalgic hydraulic L-79 cam.

Here are the specs on the motor:
I am using a set of dump hump cast iron 186 heads. I think these are 2.02 heads. The heads were given to me by my father-in-law who used to race on a small oval. He ran about two times with the heads before the season had ended. The next year, he decided to not race since there were changes made to the class.

The engine block is a 512 small journal block with a forged crank 4577. It has been bored out to 30 over and 10/10 on the crank. New cam bearings were installed. It has been line bored and decked. The crank has been grinded down and polished.

As you can see I am not going with a 1962 327 870 block.

The intake will be the performer EPS intake. Also, what can I expect for the HP? I was hoping to be around the 300 HP mark.

Also, the motor mounts are fresh though I can grind down a little of the top of the material if needed.

Stewart Allison

I thought a 512 block was a big block ? What cube is it ? Not sure if the carb is big enough. I would be putting a 600 cfm DP on it or Vac sec. 500 cfm might be just a little small. A 600 will still make fast air speed for down low and give you a lot more mid to top end on a 300 to a 350 cube motor. Stewy

jimh_1962

no I think the numbers are slightly different. I will exchange the carb.

327

Stewart Allison

I just looked on a carby site that has a calculator. I keyed in 2800 lbs @ 6000 rpm and 3.55 gears and it gives me an answer of a tad over 700 cfm ! I'll keep looking. I know a 5.0 liter with a mild cam and headwork with good spark and on the limit with comp should be comfortable with a 600. The 27 more cubes might bring you up to a 700cfm ? Stewy

Stewart Allison

The normal table to use is as follows
327cu/2 =163.5
6000rpm/1728=3.47
163.5 x 3.47 =568 cfm assuming 100% efficiency,but take it you did a good job on cams head exhaust etc we will use 80%

568 x 0.8 =454.4 cfm

Just substitute your engine size in cu” and your redline max revs in the above formula.
So if your carb is jetted and set right a 500 cfm will be perfect.
I have mixed thoughts on this equation. I still think 500 is a tad small ? Stewy

Stewart Allison

The Holley site states to multiply your cubes by max RPM. So 327 x 6000 = 1962000 then divide by 3456 = 567.7 So 600 cfm is spot on by this calculation. Have I done a good job of confusing you yet lol Stewy

jimh_1962

I am very confused...

I am running 4.11s with a 327 using an L-79 cam and 186 heads (slightly ported). I know... I am not going with corvette correct 461, 462 or 461x heads. NCRS guys look away!

Should I go with 500 CFM or 600 CFM? Also, should I exchange the edelbrock for a holly if it is lower?

What holly should I get?

It is not a big deal for me to exchange it now.

NOM61

James,

I'm replacng the 600 cfm Edelbrock on my Performer EPS with a 570 Holley Street Avenger because I'm tired of fiddling with the clearance issue and I have one of these on the shelf that I think will solve all my problems:
http://www.summitracing.com/parts/PRO-141-691/
This topic can get a bit muddled because some people have the old pre-EPS Performer manifold which does not have the clearance issues of the EPS.
I think you'll be happiest with a Holley in the 600 cfm area.

DT

Stewart Allison

600 holley Stewy

INMYBLOOD

Do you have anyone near by who will let you try their carb? No I feel hesitant to remark on carb selection as it usually seems personal preference. It seems the magazines always end up with a 750 on their 350's and such. I'd bet this is just for top dyno results. My experience comes from running a 350 in my car for the last 25 years. When I was young and put the first motor together I bought summits kit, 600 holley and performer manifold. Ran fine, after 15 years the carb was just wore out, leaked down, shafts wore. I replaced it with a 650dp manual secondarys. To me there was a noticable difference between the run of the mill 600cfm #1850 and the 650 #4150. It just seemed that after trying the 4150 the 1850 seemed like a entery level and the 4150 seemed more performance oriented. But I have not bought a carb in awhile and I see lots of holly variants and they probably all work well?? Not sure which brand of carb is the shortest? Now I even tried a friends 750 and sure when my foot was on the floor you felt like a ski boat was pulling you out of the water, but it was not as sharp or crisp as the 650 in most driving conditions. I like to be able to snap the throttle and chirp the tires just on engine response. I'm sure you'd use 100% of that 500 but I've never heard of anyone using one.

Good luck and I bet you can't wait. Gordon.