vulcanraven

Hey Larry, you need to sell them a 100mm TB to feed that thing!

Raylar Engineering

Actually, when I took that pic I had a ported 90mm LS2 throttle body in hand which was slapped on this engine.

We're looking into more options for the snout of the Raylar manifolds. We already make the 78mm / 80mm / 90mm / dual Holley throttle body versions, but you're right, a 102 would be a good addition.

vulcanraven

Since I have your prototype with the top off, Bob is making a quasi OEM looking bung to fit the 102mm TB. Like you've said throttle control will be key!

02_2500avalanche

Where are the build pics?...teasing us here

v502

iTrader: (1)

That's one sweet engine. 8.1 are torquey can imagine what these 632 will do.

Raylar Engineering

The 632cid is just the 4.5 bore aftermarket block with our 540 (4.75") stroker kit and 4.5" pistons. Our performance packages are direct bolt ons with this motor and make really impressive power numbers.

Well, this motor is running the CNC ported iron heads, so it wont make as much power as our old HO750 (632cid) with aluminum heads, but this should give you an idea of what to expect from that displacement:



and because I'm nostalgic, here's a pic of the HO750:

vulcanraven

The heads are are still on the bench with my machinist. The new seats are in and roughed, the chambers are being massaged to unshroud the larger valves and the port work is underway. He hopes to have the heads completed in 2 weeks although I'm guessing 3. The block has been line honed and the decks squared. The 4.610 bore is ready for final hone and the bottom end has been balanced. Unfortunately he's 800 miles away. I had to leave them as a job transfer took me by surprise. I'll see if I can get him to take a few progress photos for me.

vulcanraven

I fianally made it down to see my parts. I thought the heads would be further along, but... The new seats were raised to help with the blending/porting of the chambers. Hopefully since these were taken the port has begun. With the lift/duration and required spring pressures of the new cam, I will be going with an adjustable valve train and stud girdles. Thankfully, ARP makes a metric bottom SAE top threaded 7/16" stud for these heads. Comp Cams Ultra Pro Magnum Rollers and some vendor to be named later anit-pump roller lifters will go in. This combination should let it rev to the 7k mark with no issues.

The block was sitting on the floor waiting for the final hone to 4.610. There's a shot of the Ross racing pistions are being sent out to have the skirts coated. These pistions have a 20cc dish that will depending on the final cc's of the chambers will land the CR between 9:2 and 9.4:1. Beacuse of the dish I had to go with the 6.660 lenght rods over the 6.800's i wated to run.

As the machining continues I'll post some more pictures.

xx_ED_xx

iTrader: (17)

How did i miss this post...
I got 3 8.1 powered trucks...
2 are 1500's
1 is a 93 3500

vulcanraven

Yeah I've been watching your build. Hey this 634cid would make a great base for your aft axle set up. I'd love to see what 6lbs of boost would do for this thing.