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Old 02-20-2004, 05:27 PM
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need more horsepower

i have a 65 pontiac lemans w/ 389 and holley 4 brl. i dont have a lot of money to throw into right now, and was wondering what the cheapest way to add some horsepower? intake, cam, headers? if you couldnt tell im just starting to work on cars. any help would be greatly appriciated. thanks

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Old 02-20-2004, 05:39 PM
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I would improve the carb and the cam first. Most Pontiac 4 bbl. manifolds flowed pretty well stock. So did the exhaust manifolds. I don't really recommend headers. You won't see much gain with headers unless you are putting out big hp numbers.

One really cheap way to gain 40 hp. is to block your heat riser passage. You might need a little more warm up time in the mornings, but not much.
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Old 02-20-2004, 05:45 PM
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Now, I love Pontiacs, but I *seem* to remember someone using a Ram Air IV camshaft on a Ram Air III engine, and the oil lifter holes were said to be in the wrong place.

Is this true? Are "some" Pontiac cams different, or require different lifters, or...?

Anybody know? Maybe 6567GTO!?!?!?
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Old 02-20-2004, 06:45 PM
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What are some "home" tips on blocking your heat cross over passages?
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Old 02-20-2004, 07:11 PM
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I wouldn't bother. I've never noticed any improvements whatsoever by blocking the crossover, I just noticed poor cold start driveability as a result, but that's just MY opinion.
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Old 02-20-2004, 07:14 PM
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what cam

what cam should I use, I dont no anything about cars, just learning!!! should i match the cam and carb?
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Old 02-20-2004, 09:44 PM
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The whole package will need to be thought out.

Heads, porting, compression ratio, intake, headers, etc will all influence cams choices, some more than others. Car weight, tire size and gear ratios aren't part of the engine, but they will affect the package also.

I would suggest going to the more hard core Pontiac guys here, tell them what you WANT to have- ie.. street strip, cruiser, etc...
Ask the Pontiac guys what they have run in the past, what worked and what didn't.

Pontiacs are killer engines when built properly. A 1965 Lemans is a light car. You have a great starting point anyways!
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Old 02-20-2004, 09:59 PM
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Army-
I would suggest telling the guys here what kind of budjet you are looking at and are you doing the add ons yourself? Do you plan on changing out the stock gears, whick in my opinion would be one of the first to do. Then get a Trans-go shift kit. Then match the cam up to your rear gears. Then go from there.
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Old 02-20-2004, 10:41 PM
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If it is the original engine and the Lemans is in desent shape, I would leave the 389" factory stock and look for a 400" or 455" for a hot rod engine!! Then you could set the 389" back to return the car to stock at a later date!! Then you could build a larger engine a little at a time (as money allows) and still enjoy the car with the 389" in it for now!!!
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Old 02-20-2004, 11:57 PM
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I would look to improve the ignition system first. I is a good place to start and it will be usuable as you progress in the mods to the engine. Next the exaust. Then start adding to the engine as money allows. Camshafts are great, but on most engines you usually need springs and push rods and you need to prepare for that expense. Find a mentor that has built a few cars like yours and made them work. See what they have done. It beats trial and error when you are on a budget. Keep in mind to favor the mild side instead of the wild side. Exhaust will work good at 2.5" dual and turbo mufflers. Headers help performance too. It is the combination of matched items that make a vehicle run "good."
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