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Questions Regarding the HT 3.4 / 3400 Hybrid
Hello, everyone. I have a HT 3.4 crate engine with low miles (under 15k), and would like to get some more power out of it. I already installed long-tube headers, a lumpy cam, a Trueleo intake manifold, and DIS. But I still want more power. The first thing to come to mind was the Gen-3 aluminum heads. I think the cast iron heads are holding it back.
I searched through threads regarding hybrid builds on the forum, and found some useful info. But unfortunately, there are a few technical details I could not find. They are as follows:
1) If I keep the HT3.4 pistons, will there be an issue with piston-to-valve clearance?
2) If I keep the HT3.4 pistons, the compression ratio will be pretty high (around 12.5:1, according to my calculations). That would make the engine a pretty good candidate for E85, wouldn't it?
3) Since the HT3.4 block has flat-tappet lifters, the stock 3400 pushrods probably won't work. Does anyone know what would be the correct length pushrods for this type of engine?
4) I see people using LS6 valve springs on the 3400 heads. But I couldn't find the reason for that. Can someone educate me?
And last, but not least...
5) Are the 3400 and 3500 upper intakes reversible? The engine will be going into a Fiero, which has the upper intake manifold turned around backwards.
Now, just for fun, here's a little info on the engine, and the car it pushes around. As mentioned above, the engine is a HT3.4 crate engine, which I bought and installed in the Fiero a couple years ago. The engine only has about 13K miles on it. It has custom intake and exhaust manifolds, which I bought from Trueleo. The intake manifold was custom-built for a Buick GN throttle body. The engine is mated to a HM282 5-speed, from a Chevy Beretta. Here are a few photos of it:
The Fiero is my project car, and is in the process of being transformed into a "track day toy". There's still plenty of work to do, but it's coming along nicely. Here are a few photos of the car:
Anyway, thanks in advance for helping me out. And try to go easy on the new guy.
I searched through threads regarding hybrid builds on the forum, and found some useful info. But unfortunately, there are a few technical details I could not find. They are as follows:
1) If I keep the HT3.4 pistons, will there be an issue with piston-to-valve clearance?
2) If I keep the HT3.4 pistons, the compression ratio will be pretty high (around 12.5:1, according to my calculations). That would make the engine a pretty good candidate for E85, wouldn't it?
3) Since the HT3.4 block has flat-tappet lifters, the stock 3400 pushrods probably won't work. Does anyone know what would be the correct length pushrods for this type of engine?
4) I see people using LS6 valve springs on the 3400 heads. But I couldn't find the reason for that. Can someone educate me?
And last, but not least...
5) Are the 3400 and 3500 upper intakes reversible? The engine will be going into a Fiero, which has the upper intake manifold turned around backwards.
Now, just for fun, here's a little info on the engine, and the car it pushes around. As mentioned above, the engine is a HT3.4 crate engine, which I bought and installed in the Fiero a couple years ago. The engine only has about 13K miles on it. It has custom intake and exhaust manifolds, which I bought from Trueleo. The intake manifold was custom-built for a Buick GN throttle body. The engine is mated to a HM282 5-speed, from a Chevy Beretta. Here are a few photos of it:
The Fiero is my project car, and is in the process of being transformed into a "track day toy". There's still plenty of work to do, but it's coming along nicely. Here are a few photos of the car:
Anyway, thanks in advance for helping me out. And try to go easy on the new guy.
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