wht97ws6ta

Just thought I would share another one of my crazy combination of spare parts build. Before anyone asks why I didnt just use conventional heads then let me emphasize (spare parts build). The heads are a set that a customer brought to us to convert over for use on a 400 block and they got abandoned. So the heads only need a kajillion hours of port work to work for me. As for the bottom half i have a .060 over 400 block. I have a set of forged Speed pro inverted dome pistons with a 1.425 compression height for 5.7 rods with a 3.75 stroke. Instead im opting for a 3.48 stroke with a 5.85 rod length which makes a 383. Im probably going with a solid roller cam i have laying around if it specs close to what i want. Intake wise im going to run the new super vic 2. I converted the heads to run ls1 valves to lose some valvetrain weight. They flowed 308@.700 on intake and 227@.700 on exh. Thats about all i have until it get further along or on the dyno. The attachment is a pic of how much material was removed at the port entrance for this build.

stevo9389

wow does not look like there will be much room left for the intake gaskets to seal

wht97ws6ta

Ive got to set them up in the mill and cut the intake side higher towards the valve covers and will probably have to cut the intake manifold lower to get it to sit down between the valve cover rails. Im Sure ill have more time than its worth but i would really like to see the full potential of the LT castings. Its going to be a bracket motor so no street use. Thats why the ports are so big.

draggin97s10

iTrader: (2)

Interested to see how it turns out...Looks like fun

sweetbmxrider

iTrader: (13)

Damnnnnnn that's a good amount of material gone. Keep us up to date with it.

Ed Wright

iTrader: (1)

Don't forget about plugging the two water holes in the deck of each head, and drilling & tapping for larger fittings in the front ends of the heads.

wht97ws6ta

Already been done. The front of the heads were drilled to 1/2 npt. Going to run 1/2 npt to prolly #10 unions in heads and the 2 temp sensor holes in the manifold crossover then use #10 90 degree hose ends and steel braided hose to go from heads to crossover. That way every thing works just as conventional SBC parts do. Also wouldn't be dealing with a rigid crossover that will give alignment issues if the heads or manifold were ever cut later.

Ed Wright

iTrader: (1)

Those two squarish hole you have to make weld-in plugs for: I learned the hard way to bevel the holes the full thickness of the deck so they will weld full depth. They tend to crack & leak coolant.

wht97ws6ta

I actually did the opposite and just beveled the plug when i was carving it out on the belt sander. I didnt bevel full depth but it was a good 2/3s of the plug that i laid back. Maybe it'll be ok.

Ed Wright

iTrader: (1)

Hope it works out better for you than my first set. Had to repair them twice each.

BIGCAT7274

whats the csa at the pinch?

wht97ws6ta

Square area was 2.392. Still got some straightening to do so you may as well say 2.400

wht97ws6ta

Here's a few more pic of the combustion chamber cut for the big bore. The valve sizes are 2.0/1.55. Throat area is 2.400

BIGCAT7274

that's pretty big for a factory head especially with out any welding. looks like it should make some good power.

SS RRR

iTrader: (2)

Project Hodge Podge FTW. Looking forward to seeing some results.

wht97ws6ta

Yea actually at that point I could just start to hear the metal ring a little on the push rod turn with the carbides. When I start loosing the warm fuzzy feeling with the carbides I start moving the metal with sanding rolls to get more out. I got a good bit of it by lowering the floor at the pinch. These castings are solid all the way to the deck at the prp where as the set I was doing some r&d on weren't. I got 308 out of that set and the port would stall around .700 lift because I could only get a 2.120 sq area at the prp. Port still sounded clean though. So Im really not sure what I'll see with the 2.400 pinch area.