1969 Ram Air IV Intake - Pontiac GTO Forum
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post #1 of 15 (permalink) Old 11-15-2014, 07:54 AM Thread Starter
 
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1969 Ram Air IV Intake

I have a 1969 GTO that originally came with a ram air iv engine, I don't have the engine, instead i have a 1970 455 HO without the HO heads, it has standard heads. I want to install all of the ram air stuff without changing the heads and exhaust, intake manifolds. Can I use the stock intake manifold with the ram air stuff (heat ducts, air cleaners etc).
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post #2 of 15 (permalink) Old 11-17-2014, 01:57 PM
 
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Originally Posted by waterfire69 View Post
I have a 1969 GTO that originally came with a ram air iv engine, I don't have the engine, instead i have a 1970 455 HO without the HO heads, it has standard heads. I want to install all of the ram air stuff without changing the heads and exhaust, intake manifolds. Can I use the stock intake manifold with the ram air stuff (heat ducts, air cleaners etc).
Too bad you didn't get the original Ram Air IV with the car. Those engines are as rare as hound's teeth...Good luck with the work you want to do...

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post #3 of 15 (permalink) Old 11-17-2014, 02:04 PM
 
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Hounds' teeth are pretty common.....you must mean hen's teeth.

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post #4 of 15 (permalink) Old 11-17-2014, 04:42 PM
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Yes, you can use your intake. Not a problem.
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post #5 of 15 (permalink) Old 11-19-2014, 04:28 PM Thread Starter
 
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So I don't need the cross over to attach the ducts?
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post #6 of 15 (permalink) Old 11-19-2014, 06:32 PM
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You do need the crossover, unless you instead use block-off plates on those passages on each head.

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post #7 of 15 (permalink) Old 11-21-2014, 04:17 PM Thread Starter
 
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Sorry to keep bothering you Bear. Can the cross over be installed with a stock intake? From pictures it seems the ram air iv has a gap on each side for the cross over and the stock intake does not.
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post #8 of 15 (permalink) Old 11-21-2014, 05:38 PM
 
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Originally Posted by waterfire69 View Post
Sorry to keep bothering you Bear. Can the cross over be installed with a stock intake? From pictures it seems the ram air iv has a gap on each side for the cross over and the stock intake does not.
No. The RA IV is 2 pieces, the intake and the crossover. The cast iron factory manifold is one piece to include the crossover.

I believe you can very carefully cut the exhaust crossover off of the cast manifold and clean it up (which I have read is done to save weight), then you might be able to use the RA IV exhaust crossover. This would make it look like a RA IV intake, but not 100% on being able to use the RA IV exhaust crossover.

It would be a lot of work.
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post #9 of 15 (permalink) Old 11-22-2014, 06:58 AM Thread Starter
 
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It sounds like it would be much easier to buy a ram iv intake. I assume that won't be an issue on the 1970 455 stock heads?
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post #10 of 15 (permalink) Old 11-22-2014, 07:11 PM
 
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It sounds like it would be much easier to buy a ram iv intake. I assume that won't be an issue on the 1970 455 stock heads?
Intake will work, but the RA IV has a taller intake port 2.18" vs 2.05" and is just a hair wider, there will be a mis-match at the top between the intake and head. If rebuilding the engine, you can port match the heads using the RA IV intake gasket. If you did not gasket match the heads, I might build up the intake port on the RA IV with epoxy and shape it to match the gasket used for your stock heads. Moroso A&B Epoxy - Free Shipping on All Orders @ JEGS
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