Sorry if its a double post but is the na MKIII head the same as the turbo version? Talk about 1 hell of a brain fart. :dunno:
Interesting, well, I've been wrong before, Thatll be cool to see.wdragon said:No they're not, the inlet tracts of the NA are shaped for a high speed flow while the Turbo's are shape for low speed & high volume.
I've just had £1600 of work done on my head, flowed, over size valve, etc.
I mistakenly had a NA on my Turbo & was disappointed when I only made 360bhp. Then I blew my HKS and decided to get the head worked on but it was damaged.
Sourced a second head but it was different, that's when the shop pointed out that the one I had one the car when it went was from a NA.
The NA is good for torque the Turbo for top end power. Hope that help.
I've got both heads in the garage I'll see if I can get some shots to show you.
I don't know about that.ma71supraturbo said:There was a casting change mid 89, but as far as i know, no difference between NA and turbo
OK I stand corrected, but the question is why.ma71supraturbo said:There was a casting change mid 89, but as far as i know, no difference between NA and turbo
From what I understand, this is because if the intake cam being different. The general consensus is the heads are the same. But your welcome to prove us wrong.wdragon said:I don't know about that.
All I can say is that Len at the machine shop knows is stuff. He look at the marks on my old head and said my squish was all wrong & I wasn't getting the correct burn.
Then I told him it was a turbo every thing was fine. But the head has been designed with low down torque in mind.
Check his site out http://www.cylinderheadshop.co.uk/
There were a LOT of casting changes to the 7M-GTE heads. At least 5-6 I believe, possibly even more.wdragon said:OK I stand corrected, but the question is why.
And why is it that in the toyota EPC the part number dosn't change between 8601-8808 & 8808-9305 but the casting does???????
Jeff Lange said:There are 5 cam part numbers for the Supra, take from this message whatever you want, heh:
13501-42020 - 86-87 N/A Intake Cam (38.36mm Lift (I think, I'm not 100% sure on that, can someone with an 87 TSRM check that for me?))
13501-42030 - 88-92 N/A Intake Cam (38.16mm Lift)
13501-42010 - Turbo Intake Cam (38.35mm Lift)
13502-42020 - 86-87 N/A Exhaust Cam (38.36mm Lift)
13502-42010 - 88-92 N/A Exhaust Cam & Turbo Exhaust Cam (38.35mm Lift)
I have no duration information though.