• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Top Swap Talk

mofford12

mofford12

New member
I've done as much searching as I could... it's now time for my questions haha I'm trying to learn as much as I can..

2000 Gt 177k miles
Tranny has no issuses at all And same with the motor clean as a whistle, I'm curious as If it is a new motor but I have no papers and previous owner was a woman..
I know I'm going to get a couple of smart mouths in here but oh well

By doing a top swap will this blow my motor?

Should headers be replaced ?

I live 5 minutes away from the JY, would it hurt to grab the parts off a junker gtp ssei or Riviera?

Honestly I like reading the stickies.. I constantly read the threads an they answery questions for me so if anybody knows of any other good ones or feels like there's some I should read please drop the link.. and yes I read the "top swap and lots of details thread"
 


mofford12 said:
By doing a top swap will this blow my motor?

Should headers be replaced ?

I live 5 minutes away from the JY, would it hurt to grab the parts off a junker gtp ssei or Riviera?
Click to expand...

I don't really see a question here that hasn't been answered in the threads you speak of.
Yes, go to the junkyard. I love the junkyard, got a longblock L67 and 2004 CompG trans for $250 together.
Who wants to pay more for less? Pay less for more, as long as you can tell the junk aside from the spare parts.
The factory exhaust on the heads are manifolds, I would never M90 an L36/26 without headers/separate cylinder primaries.

The mileage on your car shouldn't be a huge factor if it is put together correctly and the pistons are completely intact as it sits.
 
So it's a must to replace the headers? Well i guess what I want to do is see how it went for the people who have done this..was it worth it...motor an tranny still running good
 
mofford12 said:
So it's a must to replace the headers? Well i guess what I want to do is see how it went for the people who have done this..was it worth it...motor an tranny still running good
Click to expand...

Replace the headers, no. You have OEM manifolds now I'm assuming, so you will want to purchase and install headers.

You can topswap any series II/ III naturally aspirated engine. Mileage, etc doesn't matter as long as the engine is good.

You will want to upgrade your tranny at some point. If you have no intention of going past a 3.8 pulley, then it shouldn't be too big of an issue.
 


I know that for horse power you gain about 5% more than what a stock gtp has. As far as torque I can not help you there
 
hockeybawler said:
I know that for horse power you gain about 5% more than what a stock gtp has. As far as torque I can not help you there
Click to expand...

Really? Just so I'm understanding you, sir...5% more hp than a gtp even though im still naturally aspired? I'm not as educated when it comes to engine internal parts, but can take any info tossed at me. I would think i would still need a S/C to be equal> to a gtp after doing a topswap.
 
If this topswap is just as good as a supercharger, then I would much rather do the topswap vs supercharger or turbo too....at first.
 
high compression in the NA block, and low compression in the sc block.

this is why you dont want to run smaller then a stock pulley on the blower. stock is like a 3.4 on a top swap. due to the high comp.
 
GP GT's have a higher compression block, hence why its called an L36/26 as compared to a GTP L67 which has comparatively lower compression. hence more power from a supercharger on the GT (slightly better engine)


and a GP GT has a factory 3.29 final drive ratio in the Transmission, as compared to a GTP which has a factory gear of around 2.89.



thats why topswap cars are faster than factory supercharged ones.

*in a nutshell
 


Moffy...

You talk about wise guys in your thread, if you'd like...I could play that role for you. If not, why mention it? Silly
You say you read the top swap thread. It seems you might not fully understand that a top swap is swapping the heads, charger and intake manifold off of a SC motor onto an NA motor. Doing such a swap can net about 5% more than an origininally SC'd motor. The main difference is the compression ratio from the NA lower end.
 
jerZcavy4120 said:
GP GT's have a higher compression block, hence why its called an L36/26 as compared to a GTP L67 which has comparatively lower compression. hence more power from a supercharger on the GT (slightly better engine)


and a GP GT has a factory 3.29 final drive ratio in the Transmission, as compared to a GTP which has a factory gear of around 2.89.



thats why topswap cars are faster than factory supercharged ones.

*in a nutshell
Click to expand...

I know this isnt much news to most of us on this forum or just mechanics in general, but this is what I like to here. I guess I should have known gtp's were low compression anyway. I already knew turbo/supercharger engines run a lot better with low compression...I just wasnt using my head this last night and this morning. Thanks guys.
 
You must log in or register to reply here.
Back
Top