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#1 |
Registered User
Join Date: Feb 2010
Location: Lincoln, Ca
Posts: 38
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Cam, Lifters, Headers In An Inline Six
I am starting my new project on my 1970 shortbed Chevy Pickup
![]() I am also instaling a new 2bbl Holley 350cfm carbuerator on a clifford intake manifold and clifford headers. Attached to the headers I have exhost cutouts that will be welded inline and I havent decided what type of muflers I will be running yet. I will have a few pictures in a few days. I am going on vacation for my birthday on the 16th so when I get back I will be tearing appart my motor and getting to work I will keep everyone updated who is interested. Thank You ![]() Justin
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'70 Chevy Shorty ![]() I support our troops!! Thank You to all that have served!! ![]() |
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#2 |
HickTown
Join Date: Apr 2009
Location: ANDOVER, Kansas
Posts: 355
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Re: Cam, Lifters, Headers In An Inline Six
sweet! can't wait to see pics!
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1993 Ford Mustang Vert w/ 2.3 1969 Chevy C/10 w/350 1968 Chevy C-20 w/250 1976 Dodge Aspen W/ 225 2000 Toyota Tundra w/4.7 1987 Dodge Ram D-100 w/360 255/70-15 ___________ (oo)══╬══(oo) ‾‾‾‾‾‾‾‾‾‾‾ |
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#3 |
Registered User
Join Date: Feb 2010
Location: Lincoln, Ca
Posts: 38
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Re: Cam, Lifters, Headers In An Inline Six
Here are the parts finally got all of them even my valve springs that were on back order!!
Hope to get started soon!
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'70 Chevy Shorty ![]() I support our troops!! Thank You to all that have served!! ![]() |
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#4 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Cam, Lifters, Headers In An Inline Six
SWEET!!! This should be fun to watch.
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#5 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
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Re: Cam, Lifters, Headers In An Inline Six
I've been waiting for this thread...
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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#6 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,442
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Re: Cam, Lifters, Headers In An Inline Six
Have you considered changing the pedal to a '71-72 hanging pedal with factory style cable?
I found the pedal at a wrecking yard and gathered up four cables of different lengths. I ended up using the longest one, which was from a big Cad or Olds. The cable makes a loop over the valve cover and back over the intake to the side of the carb. I have a Carter 4bbl, but the same Clifford intake. The bracket to hold the cable end was from a Quadrajet. It had to be modified to work with the Carter, but the cable attachment hole is factory. I mounted the pedal assembly when the engine was out. I think only one mounting hole was reused. Other holes had to be welded closed and new holes drilled with mounting nuts tacked in place. http://http://67-72chevytrucks.com/v...ight=gas+pedal I found this thread here where the guy did the same thing, but then made up and sold an adapter to compensate for the different bolt pattern between the '67-70 and the '71-72 style. This would be the easier way to make the change when the engine is still in place. The factory cable is a quality piece and should not be overlooked. The success of any throttle linkage depends on how well you engineer the cable attachment points and the cable housing attachment. An expensive lokar will not make a poor design work better. |
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#7 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
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Re: Cam, Lifters, Headers In An Inline Six
This is good info. I used a '71-72 throttle cable on my '66.
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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#8 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,006
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Re: Cam, Lifters, Headers In An Inline Six
I put a Clifford intake, a 4 barrel 390 Holley, and Clifford headers on all Jeep CJ's I ever owned. The difference in performance is night and day compared to stock....
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#9 |
Registered User
Join Date: Feb 2010
Location: Lincoln, Ca
Posts: 38
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Re: Cam, Lifters, Headers In An Inline Six
Now you said you used a 390 carbuerator on your jeep. I was looking into that and I was told that it would be too big of a carbuerator for the cam, and it would flood out the motor?
How did this set up work for you did you notice any flooding or problems? I am still considering the 390 because i kinda wanted a 4 barrel so that I would have more power when I get my foot into it but also get better mileage when I am crusing.
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'70 Chevy Shorty ![]() I support our troops!! Thank You to all that have served!! ![]() |
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#10 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
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Re: Cam, Lifters, Headers In An Inline Six
I used that combo on my '66 with good results.
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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#11 | |
Senior Member
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Location: Tucson, AZ USA
Posts: 7,286
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Re: Cam, Lifters, Headers In An Inline Six
Quote:
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 05-07-2010 at 06:55 AM. |
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#12 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Cam, Lifters, Headers In An Inline Six
The 350 2-bbl will work great on a 250, especially with your cam choice. You will still have good throttle response, and the mileage won't make much difference between the 2-bbl and 4-bbl. If you were having some serious head work done, anything bigger than 400cfm is overkill.
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#13 | |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,006
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Re: Cam, Lifters, Headers In An Inline Six
Quote:
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#14 | |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,286
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Re: Cam, Lifters, Headers In An Inline Six
Quote:
I asked an Edelbrock tech rep if I could jet down a 1404 to make 400 CFM. He said no matter how lean I jetted it, the carb would still flow 500 CFM. One thing about the AFB vacuum secondary design is that you only draw as much fuel/air as you can use. I ran a Holley 790 CFM on a 350 for a while. That one was definitely overcarbureted. It would stall as soon as I got off the freeway. I read in a Clifford catalog that they recommend the 2 Bbls because they think 4 Bbls will let in too much fuel and wash down the rings on cylinders 3 & 4. Since the diagnosis on my previous engine [ a '67 292 block rebuilt in '77] was that cyls 3 and 4 weren't functioning, maybe they have a point. It took me til 2002 to get there. I won't knock Clifford. I still run their long tube headers on my 2005-built 292 -- same ones I bought in '78-- just bead-blasted and hottanked and repainted w/ VHT 1200* cast iron grey. I guess 250s and 292s are as different as apples and oranges. Or maybe tangerines and navel oranges?
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#15 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Cam, Lifters, Headers In An Inline Six
I want to watch this and see the results.One question is do the headers you're going to run miss the factory shift/clutch linkage?
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#16 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Cam, Lifters, Headers In An Inline Six
Panel, I know Clifford headers and Hedman headers clear the three-speed linkage. I don't have experience with the FlowTech headers like he has, but I would assume they would. Clifford also used to make a set of shorty headres that would NOT clear clutch linkage. They were primarily for A/T cars.
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Last edited by 68Stepbed; 05-08-2010 at 07:41 AM. |
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#17 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: Cam, Lifters, Headers In An Inline Six
i definitely want to see the outcome, as i plan on doing something like this one day, BTW maybe this is a stupid question but what is a hydro cam? does that mean a marine cam? thanks
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#18 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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Re: Cam, Lifters, Headers In An Inline Six
hydraulic flat tappet
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#19 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: Cam, Lifters, Headers In An Inline Six
huh never heard hydro to describe that, thanks!
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#20 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
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Re: Cam, Lifters, Headers In An Inline Six
I used Clifford shorty headers and they cleared the linkage. The y-pipe in the photo is a home made piece.
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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#21 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Cam, Lifters, Headers In An Inline Six
Ok,I had this "floating around" in my head, but it took a bit of searching to find documentation to back it up...and give better details than I could have remembered.
Comparing 4V carburetors to 2V is not an "apples to apples" kind of thing. The CFM ratings are based upon different levels of vacuum. The 2 barrel (ventri) carburetors are tested/rated at 3" of mercury. Somewhere back-in-the-day they decided that a 4 barrel equipped engines couldn't maintain 3" of vacuum at wide open throttle....so the testing vacuum level was dropped to 1.5" of mercury. It can make a pretty significant difference. The whole article here scroll down about half way to "CFM ratings"
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Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() Last edited by LONGHAIR; 05-08-2010 at 12:34 PM. |
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#22 |
Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: Cam, Lifters, Headers In An Inline Six
heres shakys old headers i bought installed on a 292 its a lot tighter to the clutch linkage about 1/16in but it works! sorry pic was with phone so not the best.
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#23 |
Retired Air Force 87-09
Join Date: Feb 2007
Location: Bonaire, Georgia 31005
Posts: 284
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Re: Cam, Lifters, Headers In An Inline Six
Subscribed. Interested in this one.
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#24 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,286
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Re: Cam, Lifters, Headers In An Inline Six
My Clifford long tubes cleared the stock L6 Z-bar OK. '68 292, SM 465. IIRC there was some minor ball pien adjustment.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 05-21-2010 at 05:58 AM. |
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#25 |
Registered User
Join Date: Feb 2010
Location: Lincoln, Ca
Posts: 38
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Re: Cam, Lifters, Headers In An Inline Six
Hello everyone I have a question on my valve springs and how to break them in properly I have heard a fwe different ways to do it. Do I need to take out the second spring when I break in the springs? I have been told to take out the second spring to break it in and then go and put the second spring back in after it is broke in.
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'70 Chevy Shorty ![]() I support our troops!! Thank You to all that have served!! ![]() |
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