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Old 01-11-2004, 11:18 PM
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Talking pontiac 350-400 swap

I know, I know, i cant make up my mind.. I have a 1970 lemans with a 350 i just finally got headers and a ram air III cam ( i mean i just got them, they're not on my car yet) and i was talking to a friend of the family who has a 71 lemans with a 400 he just got a 455 and said i could have the 400 (nothin wrong with it runs like a champ) and since all the parts that i just bought are interchangeable i think that im gunna have a screamin 400. My friend also gave me a book on rebuild kits, i can get one with .60 over pistons and EVERYTHING i need for 420 big ones. So what i was thinkin about doin is just saving up my money (highscool wage) for about 3 months hookin up this engine and dropin it in with out telling my friends... leave my 350 tags on and have a sleeper...so what do you guys think... also i was wondering what the hp ratings were on a 1970 or earlier 400? anything would help...thanks...


-409guy

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Old 01-11-2004, 11:38 PM
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I`m no help on what the horsepower rating was. however, if you decide to buy a rebuild kit, don`t go .060 over, there`s no use in boring the block anymore than it needs, if it just needs .020 have it bored .020, that way if you keep it, it still has plenty of bore left to accept the next overbore, boring it to .060 will give it little more power, you wouldn`t notice a difference likely. if the engine doesn`t need bored at all, don`t bore it, just get it honed and reuse the pistons if there in good shape, this saves you money, since you would only need a rering kit. As for the cam, the Ram Air cam is of old school standards, cam designs have come a long way since then, I would get a cam from crane or comp, since they both invest lots of time and money into new and improved cam designs, they make the old school cams look bad in comparison.
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Old 01-12-2004, 12:04 AM
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well the thing with the cam. its lunatis version of the ram air III so i believe it has been improve upon... but thanks for the reply
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Old 01-12-2004, 05:09 AM
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The Lunati cam will work better in the 400 then in the 350 and you said the 400 runs great... Why mess with it? Put it in your car and get it fired up and drive it. Change the cam when you get the time.
Mark
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Old 01-12-2004, 07:10 AM
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i dont think leaving the 350 badges on it and putting a 400 in it makes it a sleeper. a sleeper is a car that has a bad *** engine but it dont sound like. real nice and quiet. then when you get on it you just leave everyone else behind. like a toyota supra is a good example of a sleeper, it just sneaks up on you. if you put a ls1 in a different car and put a quiet exhaust on it then that could be considered a sleeper. get what i'm sayin.

back to the important thing at hand, i say go ahead and just drop that big ole 400 in. you might have to get some different motor mounts but i am not sure. what year is your lemans by the way?
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Old 01-12-2004, 07:37 AM
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Pontiac blocks are identical from the 326 up through the 455. The 400 will go in with no changes.
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Old 01-12-2004, 07:50 AM
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Quote:
Originally posted by astroracer
Pontiac blocks are identical from the 326 up through the 455. The 400 will go in with no changes.

not quite some years/models have different mounts, some blocks have a triangle shaped mount with 3 bolt holes tapped and some have just two bolt holes tapped
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Old 01-12-2004, 01:21 PM
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the lemans is a 1970
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Old 01-12-2004, 03:53 PM
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Last edited by 409guy; 01-12-2004 at 03:58 PM.
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Old 01-13-2004, 04:57 AM
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Quote:
Originally posted by Mr. Green
not quite some years/models have different mounts, some blocks have a triangle shaped mount with 3 bolt holes tapped and some have just two bolt holes tapped
Any Pontiac motor from 65 on up has the same 3 bolt mounting pattern. The 71 400 will bolt in with no changes...
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Old 01-13-2004, 07:48 AM
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Quote:
Originally posted by astroracer
Any Pontiac motor from 65 on up has the same 3 bolt mounting pattern. The 71 400 will bolt in with no changes...

you are right his 400 will go in fine, here's a set of mounts for a 66 GTO on ebay link (2 bolt holes) and here's a set of 3 bolts link 2
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Old 01-13-2004, 09:15 AM
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Sorry, I mis-spoke myself.
Pontiac blocks with only 2 bolts holes per side were cast before 1970. From what I've seen 1964 to1969 (389, 400, 421 and 428) Pontiac engines were all "2-holers". Blocks cast from 1970 to the last of the run (1978) had 5 holes per side, at least in theory. Some blocks are 3-holer's with two blank pads (no holes). These pads can be drilled and tapped if necessary to accommodate the "2-hole" engine mount. Most blocks are "5-holer's" though. These have holes that are all drilled and tapped.
Mark
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Old 01-13-2004, 10:37 AM
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hey no biggie hope we didn't confuse the guy
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