Wil 3.0 heads fit a 3.2?

[ml98188]

Have a 94 ATX that I'm sloooowly modifying. Found a guy locally that
has heads from a '90 complete with cams that he wants to get rid of.
Thought they might make a good base for rebuild and modify but don't
know if they're interchangable with 3.2?
Thanks in advance for comments.

 

[SonicRiot]

3.0 heads fit the 3.2 block. Use the 3.2 head gaskets. It's a nice mod, actually. Do a search for more info.

Or I'm sure others will chime in. Cam the thing while you're at it.

 

[Bizzy]

Keep in mind that 3.2 head gaskets are EXPENSIVE. (Last time I checked anyway.) I'd make a list of things you want and the items required to make it happen before you tear anything apart. See if it fits your budget and if it does then collect all the parts you'll need prior to tearing it down. After that, make it happen.

 

[ml98188]

Sonic,
Thanks I'll go ahead and pick them up if the guy will answer my emails. .
Cams - definately- among other things (hee hee)

Bizzy-
That was kinda my thought.
Intake mods and Heads are about number 4 on my list and I'm only about halfway through number 2 (ATX Trans). In that this guy is virtually giving the heads away I thought I'd pick them up if they'd fit, then take my time and build them up as the opportunity ($$) presents itself.

 

[SHOtimer]

3.2 head gaskets are about $100 for a pair - which is around the same price as the 3.0 head gaskets......

However, you cannot use the 3.0 heads on a 3.2 ATX - the front 3.2 head has a unique mounting cast into the head so that the accessories will fit onto it. Swap the heads and your in for a car that won't go back together.

The only difference in the heads is that the 3.0 has different cams. People have switched and dyno'd the difference - came out to 1 hp, and that was with a MTX. Better off leaving well enough alone. Save up for a tranny rebuild.

Doug

 

[ml98188]

Hmm - thanks for the info. Trying to keep this thing as stock looking a possible at first glane so maybe these aren't the way to go.

Just had the tranny rebuilt and am NOT happy with the results. Still suffering from slow shifts and it just doesn't like third gear at all. Half throttle yeilds a 2-4 shift with maybe a nod at third passing by. Taking it back next week.

Thanksagain for the info

 

[93rev2sev]

People have switched and dyno'd the difference - came out to 1 hp, and that was with a MTX. Better off leaving well enough alone. Save up for a tranny rebuild.

Doug

For real? I'd like to see the dyno sheets...not because I'm challenging you...I would think its a flatter curve...especially helpful on the low end?

 

[Bizzy]

3.2 head gaskets are about $100 for a pair - which is around the same price as the 3.0 head gaskets......

Really? Wow, it must have been awhile since I kept up with the latest news on those. Last time I checked they were in the neighborhood of $200, but like I said, it's been awhile. That's great news!

 

[Phoenix]

Really? Wow, it must have been awhile since I kept up with the latest news on those. Last time I checked they were in the neighborhood of $200, but like I said, it's been awhile. That's great news!

Indeed, http://home.earthlink.net/~rcm_automotive/index.html

 

[SHOtimer]

For real? I'd like to see the dyno sheets...not because I'm challenging you...I would think its a flatter curve...especially helpful on the low end?

I just searched through my PM box - where the link was, it is gone. It was done by SLOSHO89 - Efren. He hasn't been around for about a year or so. He had an '89 that he did the 3.2 swap in, dyoned it with the 3.2 cams, then swapped them to the 3.0 cams.... It was a 1 hp difference.

Doug

 

[SonicRiot]

3.2 head gaskets are about $100 for a pair - which is around the same price as the 3.0 head gaskets......

However, you cannot use the 3.0 heads on a 3.2 ATX - the front 3.2 head has a unique mounting cast into the head so that the accessories will fit onto it. Swap the heads and your in for a car that won't go back together.

The only difference in the heads is that the 3.0 has different cams. People have switched and dyno'd the difference - came out to 1 hp, and that was with a MTX. Better off leaving well enough alone. Save up for a tranny rebuild.

Doug

You're right, but I thought the cast could be ground down to clear the accessories. Hm. It's been a while since I've been under the hood of a 3.2 SHO.

 

[SHOtimer]

You're right, but I thought the cast could be ground down to clear the accessories. Hm. It's been a while since I've been under the hood of a 3.2 SHO.

The 3.2 heads can be ground down to be used in a MTX application. Yes. However, he was inquiring about using 3.0 heads in an ATX application, which would not bolt up....because it would be lacking the necessary casting.

Doug

 

[AREA 91]

Camshaft Info:

As a primer, here are the measured specs of the stock cams:



MTX Intake 0.348” Lift, 205° Duration @ 0.050”

MTX Exhaust 0.328” Lift, 201° Duration @ 0.050”



ATX Intake 0.328” Lift, 201° Duration @ 0.050”

ATX Exhaust 0.328” Lift, 201° Duration @ 0.050”



The ATX Intake chain ****** is also advanced 4 crankshaft degrees relative to the MTX cam. As the Intake chain ****** is what drives the Exhaust cam, this effectively advances the Exhaust cam in an engine with ATX cams by 4 crankshaft degrees, which also reduces the overlap by 4 crankshaft degrees. Compounded with less duration on the ATX intake lobe, there is substantially less overlap with the stock ATX cams. In total, there is 6 crankshaft degrees less overlap, 4° due to the advanced exhaust cam, and 2° due to 4° less intake duration (1/2 of the total duration difference).


IMHO the extra .028 of lift, and added duration should be worth more than 1HP. I thought I could see/feel a difference after I swapped 3.0 intake cams into a 95 ATX.

 

[Shoaz]

IMHO the extra .028 of lift, and added duration should be worth more than 1HP. I thought I could see/feel a difference after I swapped 3.0 intake cams into a 95 ATX.

So you're saying the additional lift of the MTX intake cam plus the associated retardation of the exhaust timing should be expected to make more than 1hp difference?

 

[93rev2sev]

Camshaft Info:

As a primer, here are the measured specs of the stock cams:



MTX Intake 0.348” Lift, 205° Duration @ 0.050”

MTX Exhaust 0.328” Lift, 201° Duration @ 0.050”



ATX Intake 0.328” Lift, 201° Duration @ 0.050”

ATX Exhaust 0.328” Lift, 201° Duration @ 0.050”



The ATX Intake chain ****** is also advanced 4 crankshaft degrees relative to the MTX cam. As the Intake chain ****** is what drives the Exhaust cam, this effectively advances the Exhaust cam in an engine with ATX cams by 4 crankshaft degrees, which also reduces the overlap by 4 crankshaft degrees. Compounded with less duration on the ATX intake lobe, there is substantially less overlap with the stock ATX cams. In total, there is 6 crankshaft degrees less overlap, 4° due to the advanced exhaust cam, and 2° due to 4° less intake duration (1/2 of the total duration difference).


IMHO the extra .028 of lift, and added duration should be worth more than 1HP. I thought I could see/feel a difference after I swapped 3.0 intake cams into a 95 ATX.

That's the best information about MTX cams in a 3.2 that I have seen yet. When I get home I might a question or 2 for you, Area91...if that's ok

 

[AREA 91]

The camshaft info can be found on the Performance page on SHO NUT's web site.

www.shonutperformance.com

 

[SonicRiot]

The 3.2 heads can be ground down to be used in a MTX application. Yes. However, he was inquiring about using 3.0 heads in an ATX application, which would not bolt up....because it would be lacking the necessary casting.

Doug

Gotcha!

Sorry for the misinfo.