Thursday, April 21, 2011
We finally got down to business with our first test subject aka "The Black-up". This motor has been in the family for quite some time and has never received the respect that it deserves. It's basically a '77 truck motor that probably expected another year or so of faithful utilitarian duties before getting parked in a field and returning back to the Earth. Nothing could be further from the truth. A bunch of freakazoid gear heads picked it up and decided to stab it into their race car that had a wounded mill. It then got unceremoniously over carbureted and hauled to Spokane raceway where it was hot lapped until the main bearings fell away like cigarette paper. The black-up was then freshened with a forged crank and got stabbed into my Polara tow wagon to haul our 6000# race program to Mission raceway. This journey went swimmingly well for the first 3 1/2 hours before the cam decided to seriously give up the ghost and break into three equal pieces. Pretty much one of the worst engine sounds I have ever heard. Back to the shop to be cleaned out and stored under a bench for several years.
Fast forward to the present day where these same group of hooligans are yet again in need of a big block to flog after spending all of their dough on building some whacked out altered wheelbase wagon. An injected 500+ inch monster will eventually live between her fenders but not this year. So for anyone who has ever built a race engine (or any engine for that matter) you know that cleanliness, preperation and a plan of action are key ingredients to making an internal combustion engine stay in one piece. I spent days getting everything ready and finally last night we put it all together. This will never be a serious horsepower machine at maybe 9:1 compression but we've got some good bolt-ons to scavenge every ounce of power to make this disrespected big block into a descent little (big) mill.
After some basic block prep we were ready to button up the bottom end. We added a crank scraper and a one way oil screen to keep things from getting too frothy down low and we topped (bottomed) it all off with the best stock pan in the collection with a weld-in steel oil baffle. Hello budget.
Next we moved onto the top end where we bolted on the mildly massaged 440source aluminum heads. These heads are a closed chamber design so should help out in the low compression department as well as having a nice flow characteristic and weight savings.
Finally, we topped off the evening by bolting on the low rise dual quad that we will also be testing. It's a dual plane design which is more of a street intake but it also houses two carbs so we'll see how it works out. We'll also be experimenting with a couple of 2" Offy spacers. Failing that we will probably just bring our M1 intake to the track with our old trusty 950 double pumper since an intake swap is only eight bolts.
Over-all a great evening of wrenching and since we were all still pretty wired we took it down to the pub for some live music, pool and libations. Damn, I have a good life.