BBC Tunnel Ram

[HOTROD22859]

I cannot find any info on the rpm range of the Dart BBC tunnel ram if someone could tell me and also I've seen a top plate for one at a swap meet and the carb stud holes were blank. Are the carb stud holes threaded in the top plate when they leave Dart? I thought they would be and maybe the plate I was looking at possibly had all the carb stud holes stripped out. Thanks for your input. Sorry about putting this in the Ford thread, I just noticed.

[Bad Influence Racing]

The operating range will depend on the rest of the application and there are way too many variables to consider. I wouldn't go by any rated or advertised rpm range, like with camshafts. Why not tell us what you want to put it on and Ill let you know if it will be worth it..As for the tops, yes the carb stud holes are usually tapped into the top.

[Awesome Bill]

I cannot find any info on the rpm range of the Dart BBC tunnel ram if someone could tell me and also I've seen a top plate for one at a swap meet and the carb stud holes were blank. Are the carb stud holes threaded in the top plate when they leave Dart? I thought they would be and maybe the plate I was looking at possibly had all the carb stud holes stripped out. Thanks for your input. Sorry about putting this in the Ford thread, I just noticed.

Dart's tunnel ram intake will work well up to 8500 rpm with a 533 ci engine. We used one years ago with a tunnel ram engine and was the best. The larger the engine, the less rpm will be needed. The smaller the engine, the more rpm will be needed. It is very large and the carbs are placed right over the ports. The Holley Pro Dominator is very good also with the carb placement. The top you seen good of been for injection or something of that nature. The treads have to been there to install the carbs. VERRRRY good intake for a 500ci engine and larger! hth

[HOTROD22859]

Dart's tunnel ram intake will work well up to 8500 rpm with a 533 ci engine. We used one years ago with a tunnel ram engine and was the best. The larger the engine, the less rpm will be needed. The smaller the engine, the more rpm will be needed. It is very large and the carbs are placed right over the ports. The Holley Pro Dominator is very good also with the carb placement. The top you seen good of been for injection or something of that nature. The treads have to been there to install the carbs. VERRRRY good intake for a 500ci engine and larger! hth

Thanks for the info, looks like Bad Influence wants the combo so I'll post in the Chevy section.

[Awesome Bill]

Thanks for the info, looks like Bad Influence wants the combo so I'll post in the Chevy section.

Not like other people, we used to run that combination for years with a 4.600+ bore size and made 1000hp with it all the time. Nothing but an older pro stock engine before the rolled valve angles started to pop up. As far as Boggs doing your heads, it is possible he could put something together but what I have seen in my shop, I have picked up his stuff as much as 3ths. Just had a customer that his 18° stuff was killer slow. Only running 9.30's. The heads were a real mess. We just run threw the basic stuff, fixed all those cnc lines and rolled the short sides of the valves correctly, nice valve job and took out his silly cam and the car 1st pass out run 9.08. The cam was all wrong, the heads were basically right out of the CNC machine and the valve job was a joke. Maybe Curtis had a bad day. Customer paid big bucks and got a production cnc port. The dyno proved we made almost 50 more hp and with a 3100 pd car and no other changes, we picked up the 50hp for sure. The customer told me the track was not the best and he has more left. We never touch anything else.

I do know for fact that the cylinder heads you need are not the large ones. If you do use anything more than a total of 350cc's of port, your engine will be on the dogish side. I tend to use the largest port available and work down from there. Without giving away what we do for this engine, most know what is going on.

As far as the cam grinder b/s, that is a joke. Even the head porters know little about camshaft profiles, how can they, most have never seen a dyno! I have to go with Kris on this one, they just have someone grind a cam and wipe the #'s off and tell you its a secret. More like b/s as stated. Engine builders, good ones with a real dyno know what works. Believe me when I say, most head porters have their heads up their ___holes and know little. Don't put your faith in them.

Call any 5 cam grinders and you will not find 1 to match. Call any 5 head porters and you will also find none that match. This only proves 1 thing and I will let you figure that out. If you find 2 that match, buy it!

8800 rpm will be the perfect rpm for this application and will live. The aluminum rod versus steel rods mean nothing. Rods are rods. Good aluminum rods are just as strong as steel rods when properly manufactured. That is why I run Groden rods. Never had 1 break yet. Keep them away from the high side chip and they will last years, not passes.

I have 1 of those cams we used to run in this combination and 1 complete engine laying around. It was 55mm 15 years ago. If you need the right set of heads and intake with a cam that will kick ass, let me know. I am not saying Curtis can't do it, just more likely he won't do it. Get a good money back warranty if it don't work and you will see the boys falling like fly's in a raid storm. Give me a ring if you want a combination that will work!

[HOTROD22859]

A reply from someone with big bore/short stroke experience, thank you. It wasn't carved in stone that I would use Curtis, I stated that I would get his opinion and if it didn't feel right then I would figure something else out. As far as letting him pick the cam, again if it didn't feel right or make sense I would go somewhere else. He has a good reputation on Yellowbullet so I figured I could at least have a conversation with him. What you say about the volume of the port makes absolute sense to me, but I also know it's not just about volume. Thank you for taking the time to respond to this as I know the requirements for a short stroke engine are not the same as a smaller bore/longer stroke application with the same cubic inches.

[HOTROD22859]

By the way, your statement of ' if you use anything more than a total of 350cc of port, your engine will be on the dogish side. I tend to use the biggest port available and work my way down from there. Without giving away what we do for this engine, most know what is going on'. I read this statement over and over, if you think you are the only one in the United States that knows anything about big bore/short stroke engines, you are mistaken. I posted a question about rpm range, apparently I need to be schooled about 'bigger engine, less rpm'. We don't need to go any farther than that because most replies are based on the poster being ignorant and asking for help. You make your point perfectly clear, just so you know again, I am going to ask RFD for a recommendation. I can tell when I'm being bullshitted, I understand camshafts, valve events, lobe centers, symmetrical, assymmetrical blah blah. I already had cylinder heads and camshaft mapped out, my reply was more of checking with someone that's had experience. I know you people could give 2 shits less about me since I didn't ask the experts here. I've met a lot of experts in my life and I can tell you one thing, presentation is everything, especially to someone that has a grip on things to start with. If you want to argue, remember what my original question was. Thanks everyone for your input.

[want-a-be]

Sent you a PM Hot Rod. Let me know what you think.

Don

[Awesome Bill]

By the way, your statement of ' if you use anything more than a total of 350cc of port, your engine will be on the dogish side. I tend to use the biggest port available and work my way down from there. Without giving away what we do for this engine, most know what is going on'. I read this statement over and over, if you think you are the only one in the United States that knows anything about big bore/short stroke engines, you are mistaken. I posted a question about rpm range, apparently I need to be schooled about 'bigger engine, less rpm'. We don't need to go any farther than that because most replies are based on the poster being ignorant and asking for help. You make your point perfectly clear, just so you know again, I am going to ask RFD for a recommendation. I can tell when I'm being bullshitted, I understand camshafts, valve events, lobe centers, symmetrical, assymmetrical blah blah. I already had cylinder heads and camshaft mapped out, my reply was more of checking with someone that's had experience. I know you people could give 2 shits less about me since I didn't ask the experts here. I've met a lot of experts in my life and I can tell you one thing, presentation is everything, especially to someone that has a grip on things to start with. If you want to argue, remember what my original question was. Thanks everyone for your input.

Glad you have it under control and don't worry about asking and getting more than you need, just that you got what you need. HAGDay!