TT5.9mag
Two atmospheres are better than one
My experience tells me that you’ll have a very hard time keeping head gaskets in it at 10 psi. I’m not saying don’t do it. I’m suggesting starting somewhere around 3-5 psi and work up to 10.
Project Cheap & Nasty Updated With Back Story
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Well, I do have the factory steel shim gasket on it. They're pretty strong.
I'll use whatever it needs. Hopefully 90 ethanol free will do it. If not, I'll use super. Yeah, I plan on modding a Holley 500 for blow through.
racerdan80
Well-Known Member
I asked a friend of mine who runs turbo fox bodies about this. He’s never worked on a slant, but recommends start at 5 and just go very slowly from there. At even 5 psi, timing can be real critical and you’d be surprised how 1 to 2 degrees of timing can have an effect. It can be great or instant “oh ****” moment
I will probably take that advice. Thanks.
roadrunnerh
Well-Known Member
Interesting build!
TT5.9mag
Two atmospheres are better than one
Smart guy, he’s absolutely right. 2 degrees of timing can be 100 hp in some stuff. And it goes from “this is awesome” to “**** it’s blowed up” real fast.
TT5.9mag
Two atmospheres are better than one
If you’re going to use pump gas, buy the best available at the pump. At least to start tuning on. E85 is magic and opens the tuning window up big time. But you need roughly 35% more volume. And don’t shy away from ethanol in the pump gas it’s helpful for octane and inlet air temp. 91-93 with 10% ethanol is not a bad fuel for mild boosted stuff.
TT5.9mag
Two atmospheres are better than one
You’d be surprised. If it’s on there and torqued down you might as well use it. When it eats coolant, pull the head and have a cometic made for it.
A friend near by that showed up a George Rays a few years back had his 170 slant at 5lbs boost, he said he set it there for his first run and went from a 12.50 to a flat 10 65 Valiant 4 door, or Crew Cab we call it here.
TT5.9mag
Two atmospheres are better than one
That’ll do it. Read through the hanger 18 site. Lots of good blow through instructions there.
Blowthrough Carb How-To
TT5.9mag
Two atmospheres are better than one
Another thing, on pump gas, an intercooler is almost a necessity. A simple, small air to air up front is free horsepower and again opens the tuning window up and increases the safety margin.
vitamindart
Well-Known Member
you can fit one in that engine compartment. stock style felpro will handle more than the boost you want to run without issues. mine saw over 17psi more than once. as long as the tune is good. nice thing with the stock style head gaskets is they will usually fail before you melt a piston or hurt something else. thats why even on my in process forged piston short block I plan to run one.
Thanks. I have that site saved already.
Cool! Thanks. This is a long way off yet. I'm gettin bits and pieces here and there. Never thought I'd get a turbo throwed at me, but I reckon that's a sign. lol
Oh and is that junk runnin yet? lol
That sounds like a cool ride!
Trust me, I have PLENTY of ignition stuff.Next we can get in to the ignition system. Oh it’s fun spending your money.
vitamindart
Well-Known Member
not version 2 yet, hoping for a start up before the snow flies. version 1 was literally a leaker with that cracked block. tried several bandaids to slow it down, never worked.
You'll get it. Just keep moving forward, no matter how slow. I sure know about that. lol
Oh it was, he had an 8 1/4 sure grip, low gears and gutted, everything under the hood.. it was brown, only draw back.. you know, faded dog turd brown. He lives about 40 miles away in Pocahontas, but it was a solid bones car with no rear glass, just cheep plexiglass in one rear door windows and rear shield.
MidnightSwinger
Well-Known Member
As long as you don’t detonate or blow a head gasket, you can go 15-20 psi on stock internals. For how long? Depends on the condition of your rings/bearings and the sealing ability of the head gasket under boost.
Oldiron440
Big blocks rule small blocks drool!
Anymore I can do without ether one.
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