I found these heads. They are LT1 casting. They are ported to around 195cc on the intake and 75cc on the exhaust. The flow numbers are 289 on the intake and 192 on the exhaust, which are great flow numbers. They come equipped with 2.00 intake valves and 1.56 exhaust valves supported by comp 987 springs. It doesn't show the CC volume though. Thats why im hesitating on buying these. They are cheap though.

 

if its low # CC, u can have it milled out, and if its high #, get thinner gaskets?

 

Cheap and numbers too good to be true.... sounds iffy to me.

 

These heads are mint condition, top of the line heads ported by one of best companies in the business, MTI. MTI fully ported these heads to give them the best flow numbers around. They are ported to around 195cc on the intake and 75cc on the exhaust. The flow numbers are 289 on the intake and 192 on the exhaust, which are great flow numbers. They come equipped with 2.00 intake valves and 1.56 exhaust valves supported by comp 987 springs. These are a great set of heads for any LT1 looking to make huge increase in horsepower, and set up with the right cam and tune can make some serious horsepower. This is a nice set of $2100 dollars heads that can be picked up for very cheap. Price will include a fully ported intake manifold and matched for a 58mm throttle body!!


This is all he writes about the heads. I asked him about the CC numbers and valve construction and was pretty on point about the numbers and what the valves are made of. I really need heads and this seems really good. I don't know what to do.

 

Unless their a good amount cheaper than Lloyds stage 2s, I wouldn't take the chance. You might find like I did that the 987's really aren't that great of a spring. So they might have to be changed out and thats not cheap. But who knows, maybe their a kick-*** set of heads. What do they what for em?

 

$850

 

that's a good price. unless they're warped or are not as they are advertised, you can deal with the cc size.

 

The springs aren't worth a **** so figure that your going to be changing those out with whatever you run.

Even at $850, it looks like a expensive set of castings and valves to me, and heads that are flown on a happy bench. If you had real flow numbers (my guess of 260cfm) then I would consider it but it's not that good of a deal when you consider that it needs new springs, retainers, locks, locators and probably some touch up in the ports to make them work.

Bret

 

Is MTI's bench known to be 'happy'?

 

Whats wrong with the Comp 987 springs? No disrespect to SStrockerAce but why do you hate 987 so bad? When I do a search for these springs your name pops up on all of them. If I use a CC306 with these I should be fine, right? Where the hell do I find specs on those springs???

 

Just take his word on it. I have a small cam with somewhat aggressive lobes and the 987s could not control the valves. Peaked at 6k and fell off the table. Now it still peaks at 6k and only losses a few hp up to 6400rpm. Big difference.

 

The intake side seems a little "Happy" but the exhaust sounds a bit more realistic. I'm sure MTI's website tells how much cc volume their heads end up with. It's more than likely that the head hasn't had any additional milling after the original purchase. It looks like you are going to bolt these on to a stock shortblock so there isn't any worry about too much compression. Like an above post said, there are alot of head gaskets that can help you get where you want to be. Are you selling your heads you have now? PM me with a price if you are.

 

It's a short lesson in physics.... and in metallurgy.

A normal 1.400" Dual Spring (like a 987) is 120g's or more. Now put a Steel retainer on that, roughly 20g's, 6g's for locks and a 105g valve. Roughly 190g's of mass that is moving at the valve (1/2 the spring, plus all the other masses)

Now a beehive spring is 72g's, 14g steel retainer, 6g locks and a 105g valve. 161g's now.

That's an 18% mass reduction right there. With equal pressures on the seat @ 130lbs seated you just can't control the valve on closing very well when you have the same pressure and more mass. F=MA, You have to go much less aggressive on the acceleration the cam has on the valve when you have more Mass and the same Force. So your thinking why don't we go to more pressure (Force) for the same Mass.... well that usually comes with a price of more Mass but even IF you could do it read on....

Now over the nose the higher rate dual springs are placing 50lbs more over the nose on the cam, lifters and pushrods. Cast core cams can only take so much before they fail. A smaller inexpensive pushrod deflects more with more load, so less pressure to control the valve the better in terms of price and performance. Plus the more pressure a hyd lifter sees over the nose the less max lift you get.

Now one more thing.... material quality. A 987 spring even if it can handle your cam, valve, rocker and pushrod combination is not made of as good of steel. It will wear out faster and be more likely to break. The 26000 series that the beehives are made out of is a very pure spring wire that is not cheap but gives outstanding long term performance. In situations where a spring gets worn out in a year of racing you might get 2 years out of the better quality steel.

If you really want to save your self a few bucks using something that I know doesn't work to get optimum results with more lift, more aggressive lobes, more RPM and more life then go right ahead. In the long run you extra HP and maintenance costs will be higher.

Bret

 

Bret

I'm with you regarding the flow numbers on older heads with 2.0 valves. These things flowing 289 cfm is about as likely as winning the Powerball from a ticket purchased from the gas station down the street.

 

Fine. I get it! I got the heads with the matching intake for $700 I couldn't let that pass. Im looking at behive springs right now and they are not that expensive. I just don't know which ones to look at.