Will a 421 Tripower intake fit a 69 400? - Pontiac GTO Forum
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post #1 of 16 (permalink) Old 08-10-2011, 03:23 AM Thread Starter
 
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Will a 421 Tripower intake fit a 69 400?

Hi from Germany

i own a 78 TransAm for myselfwith wrong engine, friend owns a 69 GTO

He has his engine broken and we search for a new. Now we have an offer, 69 400 Engine, without intake. The man that wants to sell the engine has also a TriPower Setup from a 62 421 (?)

Question 1 is: Will that intake fit the heads?
Question 2 is: Will the carbs feed the engine well when we use little bit more cam?
Question 3 is: If it fit, what HP we can expect?

Last edited by VolkerGermany; 08-10-2011 at 04:30 AM.
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post #2 of 16 (permalink) Old 08-10-2011, 08:15 AM
 
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Welcome!
The early intakes have an extra mounting bolt hole in the rear of the intake. I don't know if you can weld up the hole and use it or not, probably not.

Burning rubber since 1982!!
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post #3 of 16 (permalink) Old 08-10-2011, 08:51 AM Thread Starter
 
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Do you have a pic that shows the difference?
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post #4 of 16 (permalink) Old 08-10-2011, 09:14 AM
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A 1965 or 1966 tripower will bolt right on with no changes. A 1964 and earlier tripower is a different story, as stated above. It will only work if you use early '64 and earlier heads. You most likely have a '65-'66 unit, as they were more common. It should be ok.
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post #5 of 16 (permalink) Old 08-10-2011, 09:40 AM Thread Starter
 
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ok thank you
so it makes no sense to buy that setup exept to sell it here or on ebay i guess and take that win and invest in a set of heads, wight?
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post #6 of 16 (permalink) Old 08-10-2011, 09:42 AM
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Why would you buy heads?? Why not buy the right Tri-Power set up? (`65 and up)
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post #7 of 16 (permalink) Old 08-10-2011, 09:51 AM Thread Starter
 
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I donīt know the setup of the engine right now. We plan to convert the 400 to a 455, goal is 430HP+

And i have no idea yet how much the 68 heads will give me in difference between cast heads and TriPower or Aluminum heads and SingleCarb
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post #8 of 16 (permalink) Old 08-10-2011, 10:10 AM
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Use the search buttons, there has been alot of discussion on this subject in several threads.
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post #9 of 16 (permalink) Old 08-10-2011, 10:37 AM
 
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I don't think the sale of a tripower intake is going to pay for a $3000 set of heads. Tripowers work on Aluminum heads, and look really cool. There are plenty of threads on here about engine builds, and HP output. Torque is king with the Pontiac, but 455 should easilly push 430 HP without being too wild. You being in Germany, you can still get the high octane gas to run the high compression heads that we can't in America. Although it is over $10 a gallon..

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post #10 of 16 (permalink) Old 08-10-2011, 11:58 AM Thread Starter
 
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I tried the search-button... and there are a lot of treads... and i donīt know which one could that be for build a budget 455
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