[bmpmdf]

I am looking forward to Pontiacs going a couple seconds quicker with the Tiger heads. Any one else want to compare a very well designed race head with a street head?

[Brian Baker]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by bmpmdf:
Bob, that is great news. Now for anyone who thinks the china cranks will live, this proves otherwise. At least you caught it and didn't mess anything up. </div></BLOCKQUOTE>

Recently pulled a Chinese crank from my engine, and guess what? No runs, drips, or errors (and no cracks).

The block looked great too. Only casualty from making upwards of 800-HP on spray (135-MPH @ 3850 lbs. race weight, you do the math)...if you want to call it a "casualty", was the front cap is cracked around the dowel pin hole (a common problem).

I think the big difference between what happened to Bob's crank, and what didn't happen to mine is Bob's pistons were heavier (his 4.35" bore to my 4.181"), his rods were heavier (his steel to my aluminum), and his rpm's were higher (his 7200 to my 6500). Would the crank have lived had Bob ran aluminum rods? Hard to say. Eagle advertises their cranks for Ford and Chevy as being good up to 700-HP, but I know of 2 Ford racers in my area that are making upwards of 900-HP and they're living. Keep in mind though, that when making this kind of HP with a cast crank, you'll always be on the edge.

[Gaby]

The crankshaft is no doubt the weak link, but there are things that you can do prolong it's life. Heavy pistons and steel rods certainly do not help the situation. Would you rather hit that chinese crank with a steel or aluminum hammer? That is what happens every cycle. Our 467" (400 based) has more than 20 passes, running 150mph at little under 2900lbs naturally aspirated. Also shifted at 7500rpm. No problems so far. We use a light MGP aluminum rod with a very light JE piston. I don't expect the crank to be perfect when we freshen the motor up, so the customer is already planning to spend the big bucks on a IA2 block and billet crank, as well as the Tiger heads when they come out to the public. Just my 2 cents..

[Mr. P-Body]

Can I chime in here? Scott looked at the Tiger. If you want something to compare it to, there's nothing in Pontiac-world. You must step up to BBC, and then only "Big Chief" can compare. That's the current race big block head, found on ProStock Pontiacs. Kinda cool, if you ask me! I've done some Big Chief work. AWESOME heads.

As for the Eagle crank, well, over 800 HP? Not bad for a $280 casting. Eagle does NOT list the Pontiac in the "competition" section of their catelog (where the aforementioned Ford and Chevy cranks are), just the "street/strip" section. It was never intended to take that kind of power.
When we took Greg's Eagle stroker down, there was no wear on the bearings, no wear on the crank (including the thrust main) and there was still "crush" in the bearings. This after over 100 passes on 1/8 and 1/4 mile tracks, and a few thousand street miles. His car ('70 Firebird) went 11.22@122 with 3.50 gears on 93 octane. It dynoed at 479 RWHP (around 600 flywheel). The Eagle is just fine when used as intended. Actually, more than fine.
FWIW

[ErikW]

Bob, does the head come "dry" (ie. dry deck) like the blocks?

Erik

[Robert C.]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Erik W:
Bob, does the head come "dry" (ie. dry deck) like the blocks?

Erik </div></BLOCKQUOTE>

Eric, the head will be cast with sand holes that are there to hold the water jacket in place. We will drill the holes out to a pipe plug tap size in production. It will be up to the customer to tap the holes to dry deck them. We are looking at adding a water input point between the two exhaust valves to cool the area.

Bill Ceralli wants to try a few things on the dyno next time to bring the power up even higher. We will not do it by porting the head.

Our second batch of heads are at the heat treat at this time. They will be machined and cut up to test the process. They all look so good, it is a crime to cut them up, but that’s what we have to do.

We are Tig welding the AllPontiac/Butler IA IIA aluminum block deck to make them a dry deck block. This process is shorter than the drill, tap and plug process. The cylinder sleeves should be here on Friday and we will ship it to the Butlers in the middle of the week. I will post pictures of that project then. David said two to three weeks to the dyno from there.

[Robert C.]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Trans Am Bob:
[QUOTE]Originally posted by Erik W:
Bob, does the head come "dry" (ie. dry deck) like the blocks?

Erik </div></BLOCKQUOTE>

Eric, the head will be cast with sand holes that are there to hold the water jacket in place. We will drill the holes out to a pipe plug tap size in production. It will be up to the customer to tap the holes to dry deck them. We are looking at adding a water input point between the two exhaust valves to cool the area.

And we will have the heads in production in time for the engine master contest. They have to be in production by a certain date to be able to be used for the competition. And we will make that date.

Bill Ceralli wants to try a few things on the dyno next time to bring the power up even higher. We will not do it by porting the head.

Our second batch of heads are at the heat treat at this time. They will be machined and cut up to test the process. They all look so good, it is a crime to cut them up, but that’s what we have to do.

We are Tig welding the AllPontiac/Butler IA IIA aluminum block deck to make them a dry deck block. This process is shorter than the drill, tap and plug process. The cylinder sleeves should be here on Friday and we will ship it to the Butlers in the middle of the week. I will post pictures of that project then. David said two to three weeks to the dyno from there.

[Mo]

Any more news? Where do I send my deposit$$$?

[J.C.you]

Bob, hope u make the deadline on the engine masters challenge. A friend is involved in the judging process. Wesley Roberson. As a matter of fact he printed up the deadline form for products to be accepted. He is somewhat familiar with new Tiger head. I have been informing him on the progress. U can send me a set and I will run them by his shop so he can see it is available for sale to the public! Good luck.

[tininjun67]

I love it! A port cast to flow well! Who knew? Why do all that porting work when you can just cast it in? The future is looking awesome for the pontiac world. What's the smallest bore size for this head?