Head Bolts?

How much will it help me if i drilled and tapped 11mm head bolts and added a couple more and where can i add them?

Thanx alot

[kmcdon3960]

That would probably be pointless and screw up your hone (you did mean adding extra headbolts, right?)

[macncheese]

yeah, people have run 25-30 pounds of boost with 10 headbolts. why would you need more?
tony

Well you know just thinkin that if i had more head bolts than i could run more boost. but hey, now that i know its not needed, less work for me! now here is another one. will it help if I O-ring my block, and how do I do it?

Thanx alot

[CowtownBooster]

Extra headbolts as you call them if improperly placed may alter how the head sits on the block, unevenly torqued basically, or head warpage

[GovtContact]

Its not to hard to go from 10mm to 11mm head bolts. Make a jig or use a drill press (mill would be ideal), drill out the 10mm holes. (I found the size bit to use for the 11mm and went a couple of thousands smaller ~.002). Tap with 11mmX1.5. USE PLENTY OF LUBE WHEN TAPPING and be sure to back out a couple FULL turns after every new full turn to clean out the shavings. Use the 11mm torque specs.

[Aries_Turbo]

have any crazies done something like go to a 12mm headbolt? yeah it may be a waste of time but....... any info?

Brian

[turbovanman]

Use head studs. ARP makes them and they are dirt cheap. I paid $100 canadian and you don't have to replace them every head job plus you have that added clamping force. 26 psi and so far so good!!!!!!!!

"thumbs up

I will tell you 1 thing. I read about it over at thedodgegarage.com. I think it was the 5digits article. A major improvment and reason the turbo II's could handle more boost was due to the crossdrilling of the head and block, which enable cooler headgasket temps, and temps between the cylinders. Some people think its not worth the time, but I've seen more headgaskets go out on turbo 1's than 2's. 5digits says the crosdrilling is good for a 150F drop on the head gasket temp between the cylinders. So if anything will allow more boost it's gonna be crossdrilling. The 11mm bolts go hand in hand with this, as they are supposed to spread the clamping force more, creating a better seal. In a nutshell it makes for less head gasket blowing possibility. I was gonna have another head I have crossdrilled at 1 point, it doesn't cost crap for them to drill some holes.

[turbovanman]

It seems that my Turbo 1 is crossdrilled in my 89 Van, stock unless mine is a rare one. I have run it all summer with no overheating and 26 psi of boost. I have 15,000 kms and no problems yet, knock on wood, , lol

[kmcdon3960]

Quote:

Originally posted by turbovanman It seems that my Turbo 1 is crossdrilled in my 89 Van, stock unless mine is a rare one. I have run it all summer with no overheating and 26 psi of boost. I have 15,000 kms and no problems yet, knock on wood, , lol

They made quite a few x-drilled t1's they were only commonblocks and 782 casting heads if I'm correct

[csxt#10]

Quote:

Originally posted by kmcdon3960 They made quite a few x-drilled t1's they were only commonblocks and 782 casting heads if I'm correct

all 89 and up motor are basicly t2 that they made the (common) for the non turbo and turbo se yes its crossdrilled same thing as a t2 but can be found in a turbo car after 89