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Old 10-26-2010, 06:47 PM
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1974 pontiac 400

i have a 74 pontiac 400 and what i am wondering is the easiest way to get up to atleast 350 hp. is my hp problem lack of airflow, or compression. or a combination of both

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Old 10-26-2010, 06:57 PM
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Put a blower on it.
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Old 10-26-2010, 06:59 PM
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haha i would love to do that but im on a budget
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Old 10-26-2010, 07:01 PM
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Budget and Pontiac don't go together. You have to pay a premium for Pontiac parts.
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Old 10-26-2010, 07:05 PM
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Should be fairly easy by selecting a cam, intake, carb and headers. If I recall correctly they were 8.5.1 compression.
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Old 10-26-2010, 07:11 PM
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im pretty sure it has 5c heads will i be able to leave the heads as are and focus on the cam carb intake headers?
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Old 10-26-2010, 07:11 PM
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Originally Posted by 1930u
Should be fairly easy by selecting a cam, intake, carb and headers. If I recall correctly they were 8.5.1 compression.
He will need to make at least 100hp with add ons.
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Old 10-26-2010, 07:13 PM
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I forgot the smog motors had timing chain sets were retarded for emmisions reduction, so if you build the engine be sure to use an adjustable timing set or 1970 or earlier timing chain and gear.
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Old 10-26-2010, 07:16 PM
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It would be much easier to do with a SBC.
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Old 10-26-2010, 07:19 PM
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Also check on the Edelbrock- Performer RPM or Torker Plus top end kits. Either should give you 350 horsepower with a good intake and carb.
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Old 10-26-2010, 07:20 PM
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well im not sure if it would or not but what im working with is a stock 1974 pontiac 400 all ive done so far is take off the intake and carb im not going to rebuild the whole thing im just looking to do what i can to it without confusing myself to badly and get some power out of it
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Old 10-26-2010, 07:21 PM
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Quote:
Originally Posted by 1930u
Also check on the Edelbrock- Performer RPM or Torker Plus top end kits. Either should give you 350 horsepower with a good intake and carb.
ill check up on that i heard the performer rpm is a great intake and i was gonna go with a 770cfm holley
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Old 10-26-2010, 07:23 PM
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Which stock 400? The top rated 1974 400 only made 250hp.
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Old 10-26-2010, 07:23 PM
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After the discontinuation of leaded gas, car manufacturers had to drop compression to prevent detonation. Anything after 1971 will have low comp heads. But other than that, a 350hp 400 is not too difficult to build. Stock bottom end would hold up to that kind of power. Put a cam in it and either get the heads shaved or find some that are around 80-85cc and they will give you 9.2 to 9.7:1 compression on a .030 over 400. Your heads should be around 98cc. For '74 heads, every .005 shaved off should reduce your volume by 1cc. So the max comp with your heads taken down .060 would be around 9.2:1. Keep in mind though that if you mill them that far, you have to mill the intake manifold also and the heads will be more prone to warpage with the thinner deck.
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Old 10-26-2010, 07:24 PM
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Quote:
Originally Posted by ponchopower48
i have a 74 pontiac 400 and what i am wondering is the easiest way to get up to atleast 350 hp. is my hp problem lack of airflow, or compression. or a combination of both
Hi fellow pontiac fan.I have had a bunch of the same questions and have found some answers. Are you going to tear the motor down?Or are you going to just hang a few parts on (wont help much)?
Do you have an automatic or a standard?
I would have to say put in a little better cam and some headers,naturally a 4 barrel. a quadrajet setup is OK if thats what you have and your on a budget.
From what I have been able to find out,... to answer your question ....your motor lacks aiflow and compression. ( so does my 350 )
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