| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
04-19-2018, 09:37 PM
|
|||
|
|||
Ram Air manifolds on 7K3 heads
Has anyone put ram air manifolds on 7K3 heads. I want to use the manifolds instead of headers cause of the no end holes on the 7k3 heads but some pictures i see of the ram air manufolds doesn’t have the inner end bolt hole. Imagine the pass side manifold. From left to right They have the outer most hole, inner outside hole. Left side inner hole, no right inner hole cause of the sharp turn, no right side inner hole and but has outer right side hole. If that makes sense. So to use the manifolds I would have to make brakets anyway. Did anybody else notice this. Ill try and get a pic. If im wrong let me know.
|
|
#2
04-19-2018, 09:40 PM
|
|||
|
|||
|
Sorry looks like drivers side
|
|
#3
04-19-2018, 11:31 PM
|
||||
|
||||
|
Pretty sure Paul Spotts makes a bracket for those heads that gives you the outer most bolt holes to attach headers or manifolds to
__________________
1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 6.0L LS single turbo, 8.85 @155 mph 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.03@171 mph 2009 G8 GT |
|
#4
04-19-2018, 11:33 PM
|
||||
|
||||
|
__________________
1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 6.0L LS single turbo, 8.85 @155 mph 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.03@171 mph 2009 G8 GT |
|
#5
04-19-2018, 11:35 PM
|
||||
|
||||
|
Oops. Not for manifolds. Sorry!
__________________
1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 6.0L LS single turbo, 8.85 @155 mph 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.03@171 mph 2009 G8 GT |
|
#6
04-20-2018, 12:22 AM
|
|||
|
|||
|
I ran them on my ‘72 GP. Never had an exhaust leak but I did use two gaskets on each manifold.
__________________
“It takes considerable knowledge just to realize the extent of your own ignorance.” Dr. Thomas Sowell |
|
#7
04-20-2018, 05:55 AM
|
|||
|
|||
|
So from what i see is on the drivers side the manifold is only going to be held on by only two bolts? The second and third bolt. No first, fourth or fifth. I have no problem making my own brackets but I thought that was the whole point of using the manifolds.
|
|
#8
04-20-2018, 06:05 AM
|
||||
|
||||
|
If you grind a bit of a flat where the needed end holes should be you can very carefully start off and drill and tap the area for 3/8" fine thread and use studs at those 4 locations.
Be very careful when you drill the holes and use a bolted up Manifold as a guide. Shim up the Manifold hole with Brass tubing when you drill so you stay in good alinment when you tap leave inperfect threads so that you can't bottom out the stud on the head bolt.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#9
04-20-2018, 06:20 AM
|
||||
|
||||
|
I put RA manifolds on my 455/7K3 motor and did what Steve25 suggested. I had the heads off and bolted the manifolds to each head, then drilled all the way through to the head bolt hole. Tapped and installed 3/8" Helicoils and used studs/nuts when I bolted the manifolds on. I put the studs in hand tight until they touched the head bolt, works great. I don't like the "L" brackets, they look like they could bend.
__________________
1967 Firechicken, 499", Edl heads, 262/[email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule. |
|
#10
04-20-2018, 08:36 AM
|
|||
|
|||
|
When i get home later I’ll check to see if i have enough material to tap a hole. Also is there a difference between the 64-67 and the 68-72 ram air manifolds or is it just a parts number difference. So can i fit a 68-72 manifold on a 65 chassis or is it a different mold. Also is there a measurable difference between the 2 1/4 and the 2 1/2 manifolds. Seems like the 2.5’s are a little harder to find and about $50-$100 more. Going on my 455, 7k3, roller cam motor, Richmond O/D trans W/3.73 rear. Just a street cruiser.
|
|
#11
04-20-2018, 10:20 AM
|
|||
|
|||
|
Quote:
http://www.spottsperformance.com/headLbracket "Head L Bracket (for RA manifolds) 2" Long studs. Set of 4. #HLB02 ..................................... $75.00 set of 4" If Bobby's heads don't have enough metal for good thread engagement. And he has to make some brackets. I'd grind on the head and make clearance for a triangle shaped brace to go in the corner of the 'L'. And would probably still make them so they come up just a tad short of the mounting surface. That way if they do try to bend you'll still get plenty of clamping force. Clay
__________________
All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
|
#12
04-20-2018, 10:24 AM
|
|||
|
|||
|
the only difference I can discern is that the 67 manifolds are 3 bolt flanges on both sides vs. 3-2 on the 68-72. Text I've read on it says there's a change in the "runner design" between them but I can't see what's different. I have 67 manifolds on my 69 without a problem so I can't see why going the other way would be an issue.
|
|
#13
04-20-2018, 01:44 PM
|
|||
|
|||
|
Just Because
Quote:
Thinking yall's cars went to front steer in 68. Not positive, just thinking. If so, the older working on newer makes sense. But may not be able to go the other way. Just something to think about Clay
__________________
All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
|
#14
04-20-2018, 04:57 PM
|
|||
|
|||
|
Quote:
|
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
