psycho

So i found an '87 supra that am interested in buying. It has a stock jdm 7mgte motor, except for a Titan Motorsports 1.4mm headgasket and ARP Head Studs. Am just wondering what kind of numbers should indicate a healthy motor.

thanks in advance

ToyDoctor

155 to 160 psi should be close to normal. Most importantly an engine can't have more than 5 psi variance between cylinders.

psycho

I know that in some 4 cyl. motors, the maximum allowed variance is about 14psi. Doesnt 5psi seem too little, or is it because its an I-6?

Orion ZyGarian

155-160 should be close to normal, but with age expect 140-160. +10 is a better number to rely on...if it was a BHG or something, it'd be like 60; not something mundayne like 1 or 2

psycho

The numbers were 150 +- 1. Anyways, i just bought the car

thanks for the info.

Reign_Maker

Good find... Anytime you can find one that some other poor soul had to do the BHG with is a good deal, Especially if they were kind enought to do the mhg with ARPs... Now, to be sure they ARE ARPs, I would pull the valve cover off one side and see... If it's a 10mm hexhead, then they are stock bolts... If its a 12point 1/2 inch then it's an ARP...

Good luck with the car... Now join SupraForums, if you havent already and let us drop knowledge on ya...

psycho

yeah, the car has many mods and is in a decent condition. Actually, i saw it on the SupraForums, and thats where i got it. I would post the link that has info/pics of it, but the site is down as of now.

BucsFanatic59

Jake, the true arp bolts have arp carved in the head as well...

psycho

There you go, scroll down for pics.

click here

BucsFanatic59

Nice find!