Tunnel Ram ? - Page 2 - Chevelle Tech
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post #16 of 38 (permalink) Old Dec 7th, 19, 10:09 PM
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Re: Tunnel Ram ?

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Originally Posted by Steve R View Post
I would guess it came on the slow boat from China. Look at the outer runners, what are the odds you will get anywhere close to decent fuel distribution?

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Without injectors at the bottom of the flange? Not good.

Pair this manifold with a pair of Skip White fabricated valve covers and you can chase oil AND vacuum leaks!
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post #17 of 38 (permalink) Old Dec 8th, 19, 11:37 AM
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Re: Tunnel Ram ?

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Originally Posted by Reelysalty View Post
69SS454,
Thanks, ever run tunnel w/single Holley ? If I took my Holley set up for common 2 plane air gap and put it on a tunnel, would you have any thoughts as to carb adjustments to make ?
Back in the day I ran a single carb tunnel ram on fairly stock Ď70 Z28. Ran great. It was a Summer only car so I didnít have any cold weather issues. Love the look. Left my hood off for the summer.

461" BBC 11.25:1 Compression
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post #18 of 38 (permalink) Old Dec 9th, 19, 11:40 AM
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Re: Tunnel Ram ?

I had my tunnel ram a pair of 390 Holley's on my Chevelle for over 40 years now. Had it on my 307, 355, and now 406. With 4:11 gears 3500 stall converter and shift kit on a TH350 tranny it takes off like a rape ape with his rear end on fire right off idle to 6500 RPM. I can't remember the last time I drove my Chevelle with single quad set up. Personally, Putting a single quad on a tunnel ram a waste. You get better throttle response using two small carbs then one large carb.
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69 Chevelle Malibu Sports Coupe Change to SS
11:1 TR406sbc/AFR227/Comp cam 280HFT/3500 RPM Stall conv./TH 350/12 bolt 410 Gears
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post #19 of 38 (permalink) Old Dec 9th, 19, 11:46 AM
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Re: Tunnel Ram ?

I actually took dual quad off and went single . Worked better for me. It was just too much carb for dual.

461" BBC 11.25:1 Compression
840 Rec Heads (2.25/1.88) AED 850 HO carb
Orig Exhaust Manifolds
Straub (Clay Smith) Hyd Roller cam, .050 229/241 .600/.569 109.
TH400, 3500 stall, 4.11 12 bolt posi
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post #20 of 38 (permalink) Old Dec 9th, 19, 11:53 AM
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Re: Tunnel Ram ?

Who ever says a tunnel ram dont work on street cars never used one and is going by internet hear say. The right carbs on a tunnel ram will run normal and gain HP and torque. Most of the time you can gain 50 HP by just bolting one on.

64 Chevelle 496
64 F100 Street Rod with BBC /Chevy trapped in a ford body
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post #21 of 38 (permalink) Old Dec 9th, 19, 11:59 AM
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Re: Tunnel Ram ?

Jeff Swisher seems to know a good bit about TR's maybe he hasn't seen this thread yet though, I know nothing about TR's but do know I wouldn't waste my $ on the summit manifold, I'm surprised they even sell that thing


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post #22 of 38 (permalink) Old Dec 9th, 19, 2:05 PM
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Re: Tunnel Ram ?

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Originally Posted by shovelrick View Post
I wouldn't waste my $ on the summit manifold, I'm surprised they even sell that thing
Exactly! I'm not railing against tunnel rams in general, I'm railing against THAT tunnel ram. The reviews were horrible, too.
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70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #23 of 38 (permalink) Old Dec 9th, 19, 2:14 PM
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Re: Tunnel Ram ?

Pretty Old Skool salty, but my old car ran around with 4.88s and a T-rammed 327. WHEELS UP!


PS, be careful about blanket comments on tunnel rams. Fab ones are for max effort 10K rpms kind of crap. yet STREET RAMS do exceptionally well, on the street.

No time slips on this one, but M20/4.88s, and a 327 with an LT1 mechanical cam. ZING! ZING!


PS THE ONLY T ram I would use is this one..... spend the $100 more reely, and use two 450s or even 600 VCs on it. https://www.summitracing.com/parts/edl-7110


ZING! ZING!
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post #24 of 38 (permalink) Old Dec 9th, 19, 2:24 PM
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Re: Tunnel Ram ?

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Originally Posted by 427L88 View Post
Pretty Old Skool salty, but my old car ran around with 4.88s and a T-rammed 327. WHEELS UP!


PS, be careful about blanket comments on tunnel rams. Fab ones are for max effort 10K rpms kind of crap. yet STREET RAMS do exceptionally well, on the street.

No time slips on this one, but M20/4.88s, and a 327 with an LT1 mechanical cam. ZING! ZING!
Yes very true stick with a good brand street tunnel ram.
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64 F100 Street Rod with BBC /Chevy trapped in a ford body
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post #25 of 38 (permalink) Old Dec 9th, 19, 2:26 PM
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Re: Tunnel Ram ?

Great minds Steven, I did edit my post to include the ONLY T ram I would use. EDEL street ram......Well, unless it was a 10,500 rpm pro mod mill.
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post #26 of 38 (permalink) Old Dec 9th, 19, 3:25 PM Thread Starter
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Quote:
Originally Posted by 427L88 View Post
Pretty Old Skool salty, but my old car ran around with 4.88s and a T-rammed 327. WHEELS UP!


PS, be careful about blanket comments on tunnel rams. Fab ones are for max effort 10K rpms kind of crap. yet STREET RAMS do exceptionally well, on the street.

No time slips on this one, but M20/4.88s, and a 327 with an LT1 mechanical cam. ZING! ZING!


PS THE ONLY T ram I would use is this one..... spend the $100 more reely, and use two 450s or even 600 VCs on it. https://www.summitracing.com/parts/edl-7110


ZING! ZING! <img src="https://www.chevelles.com/forums/images/smilies/cool.gif" border="0" alt="" title="Cool" class="inlineimg" />
&#x1f44d; So how many BBC’s did you put on the trailer w/that lii’ Chevelle ? &#x1f601;

I like the Pro Stock look of fab intake. The point about race only fab is well taken and might be why I can’t see RPM range for fab intake.

Add above issue to VS Holleys &#x1f44e;&#x1f3fb;, w/choke horns &#x1f44e;&#x1f3fb;, and no small Holleys in aluminum &#x1f44e;&#x1f3fb;....too many negatives for me.

Might leave it alone.Click image for larger version

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post #27 of 38 (permalink) Old Dec 9th, 19, 3:40 PM
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Re: Tunnel Ram ?

Know what sucks. I was just at a estate sale. There was a sbc edelbrock street tunnel ram with 2 500 holleys with linkage and air cleaners. I knew I should of bought them. Weird how things work sometimes.

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post #28 of 38 (permalink) Old Dec 10th, 19, 12:17 PM
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Re: Tunnel Ram ?

timing is everything!

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post #29 of 38 (permalink) Old Dec 10th, 19, 6:13 PM
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Re: Tunnel Ram ?

Quote:
Originally Posted by 427L88 View Post
Pretty Old Skool salty, but my old car ran around with 4.88s and a T-rammed 327. WHEELS UP!


PS, be careful about blanket comments on tunnel rams. Fab ones are for max effort 10K rpms kind of crap. yet STREET RAMS do exceptionally well, on the street.

No time slips on this one, but M20/4.88s, and a 327 with an LT1 mechanical cam. ZING! ZING!


PS THE ONLY T ram I would use is this one..... spend the $100 more reely, and use two 450s or even 600 VCs on it. https://www.summitracing.com/parts/edl-7110


ZING! ZING!
I think the one advantage of the tunnel ram is the photo above here. Look at all that nice cool air it can take in. The problem with the under hood normal dual plane or X style single 4 is it usually breathing in 140 or more degree air whereas the tunnel ram the air is like 70-80 degrees (assuming that is the outside temp). I did a test before I switched to a cowl induction set up and the air under the hood was like 60-70 degrees warmer than the normal outside air. You sit 5 minutes at a stop light the delta is probably worse with your fan blowing that nice warm radiator air right at it and the header air just rising up towards your carb. If every 10 degrees cooler is 1% more power that can add up.
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post #30 of 38 (permalink) Old Dec 10th, 19, 11:23 PM
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Re: Tunnel Ram ?

Just got around to getting on the computer..been deer hunting and I am old school and do not have a cell phone.

Tall tunnel-rams are the way to go for added power over many single 4 barrel intakes.
Big Joe was working at or for edelbrock when they came out with the single 4 barrel tunnel-ram and he said it had the worst distribution of any intake ever tested and made 100 hp less than the dual 4 tunnel-ram.

I always went tall on the rams 10" or more.
I ran AFB or Edelbrock carbs and always will on my tunnel-rams.
Tried the 450's in the Holley brand and the thing was terrible and finicky out of the hole, once you got it wound up and it cleaned up it pulled ok but not near as much pull as the dual 1405 edelbrock 600's this was a 355" with 280H cam on a 106 LSA [email protected] .050 and ported 993 heads.

I ran another dual 4 on a 350" with a 280H on a 110 LSA and same carbs.. picked up power everywhere VS my performer RPM intake which I tested with 3 different carbs.
Qjet and a 750 Edelbrock 1407 and a very much modified and epoxied 4779 Holley that flows.

I do not like the Holley carbs myself as my experience with them is long and you really need to tweak some things to really dial them in and I found for smallish or meduim size cams in the 350-427" engine size the little 1405's work excellent out of the box.

Of course set float levels correctly right off the bat.

smallish cams like 268H [email protected] .050 for those not in the know to the meduim sized cams like the 292h [email protected] .050.

Throttle response is stupid fast with a tall tunnelram and 2 of those carbs.

.060 over 396" BBC i built for a buddy 280H on a 108LSA 11:1 compression 210 psi cranking pressure strip dominator and 800 carb vs the tall ram with 2 1405's.
The 1405's on the ram had my buddies hands shaking after he got back from a test drive.. said it was ridiculous fast.
second gear from a roll and he tickled the throttle , blew the tires off and the shift light came on 7000 rpm before he knew what happened.
He said he was absolutely not ready for that.
that is in a 1966 chevy truck 4200lbs with driver and 3.08 gear.

That summit ram looks like junk. NO WAY the inner and outer runners will run even remotely close to each other.
Big fail.
If you fab a single 4 ram you need it tall and join all the runners like you see in a Dart single plane intake.
Long gradual runners that enter the cylinder head at the same angles.

Here is my 57 with a ram at the track beating up on my buddies 550wheel HP supercharged 2015 mustang.
I have 601 heads 1.84-1.50 valves Ported of course and a 280H cam 110 LSA cheap single point distributor that was not locked down tight and this pass was with 28 total timing.Yea distributor moved when i did my burnout. lost 10 degrees of timing.Ouch. still won the race though.


My buddies nova I built for him, with one of my old TR1YX 12" tall rams and some specs.
1978 Chevrolet Nova 2dr 1/4 mile Drag Racing timeslip specs 0-60 - DragTimes.com

If you go tunnel-ram go tall and dual 4's The Edelbrocks are stupid easy and you can have jetting all over the place with a tall ram and not hardly notice any difference.
I will say this though..I like to add an ink pen spring to the orange step up springs to get the power circuit to come in much quicker than you can with available stock springs from Edelbrock.

Notice I said From Edelbrock.. as many of the Stock Carter AFB original springs from the 1960's carbs were stiffer.

Abel racing has been on TV and my buddy Andrei owns it I tested an RPM intake and the same day I went home and installed my dual 4 RAM and went back and put the truck back on the rollers and made 53 more HP everywhere.. he could not believe it and kept asking what else I changed..I said well the single 4 i had an HEI and now I am running a single point distributor. Same timing curve.

Here is my 57 with dual 4 and single point autozone distributor point bounce at 7150-7200 rpm.
280H and small valve 601 heads 350".


I drive my stuff like that all the time. No loss of low end there and I have never seen loss of low end with a tall one.
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