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Old 07-29-2020, 06:17 PM
Seventy8_TA Seventy8_TA is offline
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Location: Roseville MN
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Default Differences with Ram Air III D-port repo manifolds

I would like to install Ram Air III D-port manifolds in my '78 TA. There appear to be three different offerings:
1) 1968 to 1972 GTO
2) 1964 to 1967 GTO
3) 1970 Firebird
The only difference I can see is usage of a two bolt/ three bolt collectors on 1) and 3) and two three bolt collectors on 2). Is there a reason why 1) or 3) is chosen over 2)? I bought a Pypes kit with two 2.5 inch flanges.

Ram Air III D-port manifolds with machined 2.45" collectors seen to be scarce. eBay has some but the also charge me sales tax..

  #2  
Old 07-30-2020, 09:33 AM
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mysticmissle mysticmissle is offline
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the 67 have 2.25'' outlet and 3 bolt flanges, rest is cosmetic differences and accuracy between year and model

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1969 carousel red firebird
1964 540 gto
1967 firebird tube chassis
1972 Maverick under slow construction
  #3  
Old 07-30-2020, 09:58 AM
"QUICK-SILVER" "QUICK-SILVER" is online now
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Your number 1 and 3 have the same part number at Year One.

Clay

  #4  
Old 07-30-2020, 02:07 PM
Joe's Garage Joe's Garage is offline
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Default The 64-7 GTO factory headers tuck in a little tighter to the block.

The frame on the earlier A-body cars is narrower around the engine, so the headers fit a little closer to the block.

One thing that would do is put the heat radiating off them a little closer to your starter motor.

Everyone says they will also fit the later models, but we've never actually tried that.

Having three-bolt flanges on both sides is a plus.

Good luck!

  #5  
Old 07-30-2020, 04:33 PM
'ol Pinion head 'ol Pinion head is offline
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The outlets were in slightly different position between the '67 GTO HO manifolds & the '68 GTO HO manifolds. Twenty plus years ago RARE's left hand A-body/2nd Gen Dport manifold was patterned off a '67. Know I had a friend that had issues with fitting just such a manifold on a '70 4spd T/A. That issue was addressed by RARE with more correct Dport manifolds being offered for '68-70 A-boys.

On a true '70 RAIII restoration, I've sought out original '70 RA III manifolds in great shape. Which manifolds, it all comes down to what ones building or restoring.

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Old 07-30-2020, 05:04 PM
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Rocky Rotella Rocky Rotella is offline
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Quote:
Originally Posted by 'ol Pinion head View Post
The outlets were in slightly different position between the '67 GTO HO manifolds & the '68 GTO HO manifolds. Twenty plus years ago RARE's left hand A-body/2nd Gen Dport manifold was patterned off a '67. Know I had a friend that had issues with fitting just such a manifold on a '70 4spd T/A. That issue was addressed by RARE with more correct Dport manifolds being offered for '68-70 A-boys.
This is correct. I had clutch linkage clearance issues when I installed reproduction '67 A-car manifolds on my '76 T/A. I remember being disappointed and perplexed when I'd believed they'd install without issue. I'm glad to hear that RARE does offer the correct outlet for 68-70 A-body and 70-up F-car.

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