i have a 92 305 and want to put a 400 in but i dont know were to begin any advise?

 

(I started a new thread, rather than tag on to the one where you posted this.)

First question is: "Emissions?" Yes or no makes a lot of difference with regard to where you go from here.

Next is, "What 305 do you have? What transmission?" Most likely you will need significant EFI upgrades in order to run a 400. The typical 400 swap goes to carb, which is not emissions legal. So, that's why the first question is so important.

What do you plan to do with the car? Do you have the 400 yet? How's your budget?

 

It could be made emissions legal, prob a emissions era non cc q-jet and quite a fue $$$ to do it but it could be done.

 

im looking to run an xfi igniti $1500 with a super ram. 1 3/4 headers $89 each.change the crank to a 3.75 from the stock 3.55 and ported and polished heads my 92 bird has tpi im upgrading the cam and valvetrain. and adding a serpintine belt. i know a guy with a 73 lamans with a 400 in it its a 4 bolt main and still has a lot of power he wants $495 for the engine or i can go reman for $1200 either way my 305 with 38,000 miles on it will be replaced with a awsome engine. and the 305 will probaly find its way hear!!
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i ave a 700r4

 

wow, where to start. 1 3/4 headers for 89 each? really what ones. a 400 has a 3.75 crank, not a 3.55. a 400 also has a different block, maybe you mean to build a 383, which still requires a 350 block not a 305, a 305 stroker is a 335 with a 3.75 stroke. a 73 lamans has a pontiac 400 which is a totally different engine. and "here" is spelled "here"

 

Yep, it's ok to do a 400 Chevy motore but don't put an old Pontiac 400 into a 3rd gen. THat is a totally different deal. it would fit. It would just be plain wrong.
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Okay, we still need to know whether or not you have emissions concerns.

Now, a '73 La Mans would have a Pontiac engine in it. I'm not saying "Don't put a Pontiac engine in a 3rd gen," because there's a whole sticky about it at the top of this forum. However, if you have to go through emissions, forget it, because Pontiac engines didn't exist anymore in the 3rd gen era, and that's Rule #1 for emissions. And, I've never heard of a Pontiac version of a Super Ram, but that doesn't mean they don't exist. Neither your TPI nor transmission would fit a Pontiac engine.

However, if a Chevy 400 was swapped into the Le Mans, that's a different ballgame, but there are still issues to work out.

So, let's establish the basics before we spend any more time sweating the details.

 

Yeah, What he said...

 

no emissions problems but i just picked up a truck 78 k5 blazer the guy took out his 350 spent $$$ on a 400 boared it 40 over edelbrock heads intake every thing eagle crank you name it i have the blueprints on the engine th350 tranny with stage 3 shift kit 411 posi rear and just so much more well long story short he got injured couldnt get in it any more it was to tall his wife was a family friend and i got it for 800 i also have multiple dyno sheets last one was 447 at the wheels so now it goes in the ta and i got my eye on a 98 c5 tranny with electronic shift kit for 250 and 37k on the milage yhea i lucked into that one
thanx for all the repiles and help i bought a 400 and was building it but im scrapping that project and selling off parts to my bro who has a 84 ta

 

Wow. Spell check? I have a headache now.