3.4 dohc question

bobuh · Posted: Thu May 08, 2008 2:12 pm Post subject: 3.4 dohc question

Is there any way to mate the dohc's from the 3.4 on a 3.1? they are practically the same motor. but i was looking it up and it says the cam and something else is exchangable, thats bout it. i wana use the 3.1 block instead of just buying the whole thing. also im looking for new parts, jbodyperformance isnt really selling 2nd gen parts any more so i guess im gona have to get some of my stuff custom made unless some one else has a source???

cobra17st · Posted: Thu May 08, 2008 2:24 pm Post subject:

The blocks are different. 3.1s are cam-in-block whereas the DOHC motors have the cams in the heads. 3.1s use timing chains and 3.4 DOHC uses timing belts...short answer, you'll need to use the 3.4 DOHC block.

FYI: http://domestic.3400z24.com/660board/viewtopic.php?t=827 and http://www.geocities.com/jeremygonyou/3.4swap

For 2nd gen parts, your sources are http://www.mrzperformance.com or http://www.wot-tech.com. JBP was overpriced and had marginal (if that) customer service anyway.

weston19 · Posted: Thu May 08, 2008 5:18 pm Post subject:

the 3.4 tc still has a chain

They just mickey moused it and have a snout were the cam sprocket is that drives tyhe sproket for the belt and then to the heads. Most of the block is the same, but small oiling changes and casting diff's make them none interchangable. Have fun with the swap, its such a tight fit i would never want to even attempt it. I seen it in person

infernoz24 · Posted: Thu May 08, 2008 6:59 pm Post subject:

It can be done. Look up colins attemp (V6HO) but you would have to install a Break Booster/Master from another car.

Also decide on what version 3.4DOHC you want to install. 90-95 are different from 96-97. And the power output goes up from 200HP in 1990 to 215HP in 96/97 There are lots of potential with these engines. I am now just finding out.

macneil · Posted: Thu May 08, 2008 8:08 pm Post subject:

Has this actually ever been completed

I am really interested in the finished project, would never attempt it myself but defanitly wanna see it done

decyphex · Posted: Thu May 08, 2008 8:13 pm Post subject:

I wouldn't bother with that swap. It makes the engine bay really tight, you get the unreliability of timing belts and a lot of hassle. You can make great/comparable numbers with a 3500 like Dave's or even a 3400. And when I say Dave's I mean after modifying a DOHC 3.4.

lvcmstckz24 · Posted: Thu May 08, 2008 9:34 pm Post subject:

whitelightning2 · Posted: Thu May 08, 2008 10:13 pm Post subject:

GM stopped making that engine for a reason, don't waste your time.

stock 3400's with an intake and exhaust are putting down the same numbers as a stock DOHC would.. and with a simple valve spring upgrade they'll handle the high RPM's just as well. they're also lighter and fit MUCH better in the engine bay.

the DOHC has almost no aftermarket support as well. Also have fun dissassembling the engine cradle just to change your alternator..

Chris scrapped that car, the DOHC never ran or was mounted propperly to my knowledge. I don't think the other guys ever ran either.

decyphex · Posted: Thu May 08, 2008 11:14 pm Post subject:

lvcmstckz24 · Posted: Thu May 08, 2008 11:23 pm Post subject:

cobra17st · Posted: Fri May 09, 2008 6:36 am Post subject:

whitelightning2 · Posted: Fri May 09, 2008 9:18 am Post subject:

Mounting it in is one thing but getting all the plumbing done, exhaust hooked up and all the wiring /accessories working is another.

that's a BIG engine.

the 95 grand Prix engine bay is 4" wider between the subframe rails then our bay, it's also 4-6" wider from the radiator to the firewall (i can get exact measurements this weekend).

skunkworks_zed · Posted: Sat May 10, 2008 10:14 am Post subject:

Theres only one car to my knowledge that did a successful, running swap, and it was a Beretta that was around this area. I saw the car and what he did to make it work. The car ended up going to the scrapper since the owner was trying to sell it but no one seemed interested in buying it.

I think those motors are good motors, but personally I would just stick with the pushrod.

3.1lbird · Posted: Sat May 10, 2008 5:50 pm Post subject:

ya that is a big motor. u would probly be better off going with a 3800s/c at least u know it has been done before

dirksz24 · Posted: Mon May 12, 2008 12:40 am Post subject:

those motors are pieces of shit... why? the biggest pain in the ass to work on. there is almost nothing in the engine bay that is easy to get to :S whenever i see one show up at work, i usually go for lunch. lol

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