Hello... A bit of an odd question maybe but would the headers from a 348 fit a 308 QV engine? (Why on earth, you ask? I have a 8.32 engine (almost the same as a 308 QV engine) that is going into a longitudinal installation and a local breaker is parting out a fire damaged 348.) I feel like they should fit, isn't it the same engine family? I would go have a look if the breaker wasn't 300 miles away. And also, they are stainless, right? Best regards, Patrik
The 348 headers will bolt up to your 8.32 heads. But they come out horizontally for a fair distance before they turn towards the rear. If you have a wide engine compartment they might work.
The 8.32 is not "almost the same" as a QV engine: it is quite different as it has a cross-plane crank instead of a flat crank. Rgds
Ah ha! The Thema. I didn't catch that the first time. Lancia Thema - Wikipedia, the free encyclopedia
yes Wade: we see 8.32 engines for sale from time to time here for less than 1/4 the price of a QV engine, but it is not necessarly a good deal, depending on what you intend to do with it... Rgds
I am aware of the differences but it is enough "almost the same" to let me source the same valve guides and piston rings. If they bolt up and port dimension match I am happy. If they are stainless, even more so. Engine compartement will be as wide as required, it's not designed yet Image Unavailable, Please Login
i would say almost the same since the heads and block (though modified slightly for the thema transaxle). next question...has anyone ever fitted a flat crank and cams to a 8.32? for me a 8.32 is somewhat like the parts sharing strategy of the F430 and maserati motors where the major two major castings are similar or identical.
I have had both engines in my possession in the past. As for the castings (heads and block) the heads are identical to QV heads. All the buckets, shims, etc are the same and the Ferrari cams drop right in. The block is slightly different (as per below) but the liners, pistons, and rods looked identical. And I was able to place a 308 crank into the block. So I would expect that someone could build a screaming Thema if they wanted.
A cross plane crank is not necessarily a bad thing. Maybe not as much power on the top end but better midrange torque, at least that's what the Internet says! . PS, check out the new GT350 Mustang, it is going to have a flat plane crank.
If you are doing some sort of a custom application, making custom headers is something that isn't that hard to do. Get or cut off the flanges where they bolt to the head and build/bend tubing to your needs
Aha! I recognize you now Speedy, you posted in my thread at AlfaPower! (I don't think you ever read my reply PM) The less power with cross plane crank theory is often mentioned but I don't subscribe to it. I choose to believe the lower power output with this engine is in the cam timing rather than anything else. Unless it's an automotive fact well grounden in physics and not limited to this engine and I am completely clueless. ----- But having just spent 30 minutes looking at images of complete 348 drive trains, no these headers are not for me. The 348 gearbox outputs are situated above input shaft hight and the headers go underneath the drive shafts, at about the exact hight where the shafts would go with the Audi gearbox I am planning to use. So custom it is. Thank you for playing.
More power peak potential with a flat crank with the advantages of the exhaust tuning. firing order phasing helps with exhaust flow. Cross plane cranks are smoother running and the crank construction is often heavier. Ever notice the crossover header pipes to the other on an old gt40 v8? Apparently these were to get the exhaust to flow better somewhat mimicking a flatcrank exhaust
But either design still produce a power stroke every 90 degrees. The crossovers connect those exhaust pulses separated by 180 degrees, two from either side. With the flat plane crank all four of 180 degree separation is already on the same side. This leads me to believe there is no difference in power potential between the two designs, should crank weights* be equal (mine is 18 kg on the bathroom scale). Now yes, the 308 does have 180 degree headers and the Thema 8.32 in original form does not. Others have shown that there is power available with a modern EFI but still with stock headers. I would like to get back to this topic when the car is built and the engine is in it, and tinker with the cams, to see where the little horsies are really hiding. *And if crank weight is a significant issue, then there is also fewer rotating parts between engine and gearbox on the 8.32...
I am using 8.32 in my p4 replica with renault NG 9 gearbox. You keep car light and 200+ hp is plenty for road use.
I lied! https://youtube.com/shorts/qdb9UyPz2hE I changed my mind about a year later and I guess I was lucky used 348 headers aren't flying off the shelves.
