cadillac512
Well-Known Member
The first engine I had in the "T" was a low compression (8.6:1) 120cc head build with less cam than your MT20,Flat top KB's,2.11/1.77 valves and decent porting job,good rockers,2115 Edel and 850 Holley. I ran a best of 10.66 at 123 with that one,and it's still just fine sitting in the corner waiting to be put in something else.
The "T" weighs 2500# with driver so if your car is close to that it should perform at least that well...probably better. The next engine is the one you posted about,and it has stock Caddy rods that I put ARP bolts in and resized the big ends to top of spec. I believe that the bolts are the reason the rods stay together. I lube them properly and install them with a stretch gauge....stretched them .0065" if I remember correctly. Big rpm will kill rods quicker than big power though,and when that big heavy piston goes over TDC it pulls HARD on the bolts. I spun that engine to 6000 rpm every pass and it had gone over 700 passes when I pulled it out and put it in the corner beside the low compression one. It too is just waiting patiently,lol.
My current engine is a 514" 12.6:1 deal with forged pistons and the same Olds 6.735" rods you have. I decked the block to make up for the .015" shorter. Heads are seriously ported and intake ports are raised .400" with the floors filled .300" as well.Running a 268 at .050 /.600" lift solid cam on a 108 lsa in this one,and a MTS single plane with a 1050 Dominator. It has gone 9.50 at 138 so far. I spin it 6500 regularly.
Terry
The "T" weighs 2500# with driver so if your car is close to that it should perform at least that well...probably better. The next engine is the one you posted about,and it has stock Caddy rods that I put ARP bolts in and resized the big ends to top of spec. I believe that the bolts are the reason the rods stay together. I lube them properly and install them with a stretch gauge....stretched them .0065" if I remember correctly. Big rpm will kill rods quicker than big power though,and when that big heavy piston goes over TDC it pulls HARD on the bolts. I spun that engine to 6000 rpm every pass and it had gone over 700 passes when I pulled it out and put it in the corner beside the low compression one. It too is just waiting patiently,lol.
My current engine is a 514" 12.6:1 deal with forged pistons and the same Olds 6.735" rods you have. I decked the block to make up for the .015" shorter. Heads are seriously ported and intake ports are raised .400" with the floors filled .300" as well.Running a 268 at .050 /.600" lift solid cam on a 108 lsa in this one,and a MTS single plane with a 1050 Dominator. It has gone 9.50 at 138 so far. I spin it 6500 regularly.
Terry