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Recommend a tunnel ram/carb BBC

General engine tech -- Drag Racing to Circle Track

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cuisinartvette
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Recommend a tunnel ram/carb BBC

Post by cuisinartvette » Mon Apr 15, 2019 11:07 am

1930is street rod
32" tire, 4.11 T400 454 with what sounds like a 280 type cam
Guy wans a tunnel ram and Eddy carbs. Has 041 heads but looking at some AFRS

1-what size head would you recommend

2-Tunnel ram/carb combo

I believe its a flat tappet Hyd cam

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Re: Recommend a tunnel ram/carb BBC

Post by F-BIRD'88 » Mon Apr 15, 2019 11:35 am

Did you mean 049 heads? BBC oval port open C....
If so use the Edelbrock BBC street tunnel ram (oval port)
This manifold has a removable top so you can try many carbs out if you like.
My recomendation is the new eddy 650 AVS2 carbs.
#1905 the eddy 1407 are fine too for this.

Ditch the lil hyd and get a street solid or street solid roller
For this.
Need more info to suggestc a new cam.

CR, car purpose, trans converter , etc etc.

The 049/781 bbc oval port heads make plenty of power once 2.19x1.88 valves and correctly ported.
(See Vortec Pro )
Note the BBC Eddy street tunnel ram oval port is a very good choice even if rectangualr port heads are used. Or even if AFR heads are used.

People seem to make sick power with the Pro Comp BBC alum heads too. On these plan on having a pro go thru them... Valve seats, valve job etc etc.
Consider these as rebuildable cores when new.
And they may well need as much work as reworking the 049 heads correctly for power, but again people do seem to get results with these....
Last edited by F-BIRD'88 on Mon Apr 15, 2019 12:00 pm, edited 1 time in total.

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Re: Recommend a tunnel ram/carb BBC

Post by F-BIRD'88 » Mon Apr 15, 2019 11:52 am

If this 454 is just a low cr flat top piston stock oval port engine you need to know this... The real cr will be very LOW 7.8-8.2:1 ish... If so..... Consider street supercharging..
A tunnel ram street 454 will want true 9.5 to 10.5:1 cr.
7.8:1 does not cut it for this.
It is easy to cam it for big street TR power but this is a street motor
So....need specifics on how it will be used. And converter.
Etc..

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Re: Recommend a tunnel ram/carb BBC

Post by F-BIRD'88 » Mon Apr 15, 2019 12:07 pm

The range of bbc cams i have in mind for this are not huge racing cams. They are street/strip cams that let the Tunnel Ram do it on a street 454 with power, torque and reliability... You can consult VortecPro on this too.
He has a good handle on these motors....

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Re: Recommend a tunnel ram/carb BBC

Post by mag2555 » Mon Apr 15, 2019 12:27 pm

The Weiand tunnel rams basically have a great combination of drivability and power right out of the box, due to runner length and Plenum volume.
And heads you / he will run that flow over 320 cfm @ .600" lift could use a 1050 dominator on top to feed them ,so two 750 Carbs should fit the bill nice, in fact Edelbrock has just come out with a new Carb that is getting darn good reviews!

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Re: Recommend a tunnel ram/carb BBC

Post by cuisinartvette » Mon Apr 15, 2019 1:54 pm

He will not do a solid lifter cam period

He has some 14x32s and a 9 inch under it at 62 he drives the piss out of it.
Mag which Eddy carbs do you recommend he is stuck on them. He has a single plane and an 850 with a proform body which is dialed in well but tired of it.
(AVS thunder?)
Also insistent on AFRs...I know some guys use the pc chinese stuff he knows better. He runs it around town, long fwy trips, planning on the strip too.

265 is kinda smallish but ought to run pretty strong id think? 290?

Not sure on compression Ill have to ask. He is willing to spend on good heads/over having them ported, wants weight off the front end as it is.

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Re: Recommend a tunnel ram/carb BBC

Post by F-BIRD'88 » Mon Apr 15, 2019 5:34 pm

You should advise your friend to strongly consider using the eddy Big Block Chev RPM Dual Quad Hi rise on his Street Rod w hyd cam and AFR's . Looks plenty nastly especially with carb spacers (which add power to this).
It will make very big power . thus is a 650+ capable inductionvsystem on 454 bbc.
He will not be bored. Use the 2x 650 AVS2 carbs or the 750 carbs onit. Pass on the 500's even if someone tries to give em free..

There was a member hrre that dynoed this and used a few of my recomendations along the way.
Made big big power 630hp ++. 2 eddies on the new eddy Dual Quad Rpm Air Gap.
Joe Sherman did a few of these too. Very very impressive power and torque. Using the bigger carbs + spacer trial is key.
Your friend will be very happy.

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Re: Recommend a tunnel ram/carb BBC

Post by Little Mouse » Mon Apr 15, 2019 5:50 pm

cuisinartvette wrote:
Mon Apr 15, 2019 1:54 pm
He will not do a solid lifter cam period

He has some 14x32s and a 9 inch under it at 62 he drives the piss out of it.
Mag which Eddy carbs do you recommend he is stuck on them. He has a single plane and an 850 with a proform body which is dialed in well but tired of it.
(AVS thunder?)
Also insistent on AFRs...I know some guys use the pc chinese stuff he knows better. He runs it around town, long fwy trips, planning on the strip too.

265 is kinda smallish but ought to run pretty strong id think? 290?

Not sure on compression Ill have to ask. He is willing to spend on good heads/over having them ported, wants weight off the front end as it is.
Afr looks to have a 300 oval port head now that flows 390 cfm. Thats big time out of that size runner. Street rod no beating any street type tunnel ram over 3500 rpm. With a tunnel ram evrn lower rpm if he stuck on elderly old man carbs, new 800 avs 2

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Re: Recommend a tunnel ram/carb BBC

Post by Little Mouse » Mon Apr 15, 2019 5:52 pm

Little Mouse wrote:
Mon Apr 15, 2019 5:50 pm
cuisinartvette wrote:
Mon Apr 15, 2019 1:54 pm
He will not do a solid lifter cam period

He has some 14x32s and a 9 inch under it at 62 he drives the piss out of it.
Mag which Eddy carbs do you recommend he is stuck on them. He has a single plane and an 850 with a proform body which is dialed in well but tired of it.
(AVS thunder?)
Also insistent on AFRs...I know some guys use the pc chinese stuff he knows better. He runs it around town, long fwy trips, planning on the strip too.

265 is kinda smallish but ought to run pretty strong id think? 290?

Not sure on compression Ill have to ask. He is willing to spend on good heads/over having them ported, wants weight off the front end as it is.
Afr looks to have a 300 oval port head now that flows 390 cfm. Thats big time out of that size runner. Street rod no beating any street type tunnel ram over 3500 rpm. With a tunnel ram even lower rpm if he is stuck on elderly old man carbs, new 800 avs 2. Remember what joe sherman used to say about elderly carbs that they were over rated in cfm size. So you may want to consider that 800 rating more like a 700 holley rating.

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Re: Recommend a tunnel ram/carb BBC

Post by cuisinartvette » Mon Apr 15, 2019 9:46 pm

Says his cam is around .550 lift 284/296 so trying to read between the lines on what he may have.

Considering the 265 CNC as he never takes it above 6200 (usually 6k)....suffient or does he truly need a larger head?

Says its a little soggy right now with his current setup down low no idea on what converter he has or what tune up is on it.

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Re: Recommend a tunnel ram/carb BBC

Post by cuisinartvette » Mon Apr 15, 2019 9:51 pm

Are these tunnel rams all square port deals ? May as well do it right
Doesnt want to cheap out but aint rich either.
Suggestions?

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Re: Recommend a tunnel ram/carb BBC

Post by F-BIRD'88 » Mon Apr 15, 2019 11:15 pm

Edelbrock street tunnel ram is oval port.
Weiand hi ram is offered in both oval and rec port.
A 290 cc port oval port head is fine.
Cam may be xe 284H-10.
284-296-240-246-110 .574 .578
Its not soggy as long as cr is right and ign curve is right.
I bet both cr is wrong and ign curve is wrong too.
3000++ stall.
Bbc hyds are all done by 6200 rpm.
Solids rev higher.

If current intake is single plane and no converter and low cr, yup its going to be soggy.
A Dual Plane hi rise like the Rpm or Rpm Duad Quad
Will be much more snappy down low than a single plane.

I bet this motor is a stock smog motor low cr someone stuffed s cam and intake on it.
If that is the cam Xe284h-10 there is nothing soggy about it. Same in my 406 sbc yanks the front wheels ran 11's. Its a really good street hyd flat tappet cam.
Needs converter gears and 10:1.
If this motor has stock flat tops the cure is to bolt a supercharger on it.as the cr is very low ...Inspect with lighted borescope tool thru spark plug hole. Look for piston dome.

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Re: Recommend a tunnel ram/carb BBC

Post by F-BIRD'88 » Mon Apr 15, 2019 11:50 pm

If the cr is low (flat tops) and no converter
Then change rear tires to 28" tall, advance 284h cam to 104,
Lock out ignition timing mech curve 36-38 deg.
Retain vacuum adv. 12 deg Change single plane manifold to
Performer RPM. Dual plane oval. (Can be dual quad)
It will be a very different car.
No longer boring. Add 10" converter too.
If pistons are flat tops there is no point in AFR heads
And tunnel ram until this is corrected.
(Rebuild). 10:1 pistons....

But it will go great with a roots super charger and 2 eddy carbs.
284h-10 cam is fine. Street 6-71 or 8-71. 2x750

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Re: Recommend a tunnel ram/carb BBC

Post by cuisinartvette » Tue Apr 16, 2019 8:54 am

Going to pull a plug and see what I can for pistons,claims he has over 11:1 he built it
14x32 M/T are staying....Ill ask about stall wonder if thats the problem

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Re: Recommend a tunnel ram/carb BBC

Post by cuisinartvette » Tue Apr 16, 2019 11:11 am

F bird he is dead set on the tunnel ram afr deal. Car was built around tire size etc
Its an old street rod ex ambulance that was chopped up kinda looks like an old delivery/panel truck just shorter.
He wants the visual impact of the tram but also wants to track it, he could care less about practical.... all about lighting those M/T up.

He drives this thing to local cruise nights or on 3 day runs rain or shine
Blower would look sick but its useless power at this point

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