HORSEPOWER TV Pontiac Motor Build

today on horsepower TV we will show you how to build a hot pump gas Pontiac 455 complete with forged pistons victor intake and 1050 CFM car then we'll test this iron Indian on our horsepower shot dyno in our race of the week we'll follow a fast moving family competing in three hot classes at the IHRA Empire Nash Plus examine some cool tools your shock so hang on for horsepower TV [Music] all right welcome to the horse power shop for many of you the GM a body is a popular platform for just about any kind of street machine build up and the bells are out there in the largest numbers we'll show you more of this beauty later on but did you know it was the Pontiac GTO that launched the muscle car movement back in 1964 yeah just take a look at this 69 judge now the carousel red paint and eye-popping graphics make this limited edition GTO a real attention grabber and just check out what's under this Ram marehood what we've got is a 400 cubic inch thumper rated at 366 horse and backed by a Muncie 4-speed now in 1970 Pontiac put a new chief in charge the 455 now today we're going to show you how to build a 600 horse pump gas poncho using off-the-shelf parts yeah but first we need to make a trip to jim Butler performance down in glioma Tennessee that's where they're machining the building blocks for our fearsome 455 our freshly-baked original block is lime honed and bored 30 thousands over and the forced deck before it's ready for new parts meanwhile here are four 55s heads are ported polished and flow tested to give us 320 CFM and 28 inches of water they're fitted with new valve guides the new valves get a three angle 45 degree cut the heads then are milled cleaned and ready for assembly now for the crank before balancing its large rod journals are cut 50 thousands to accommodate big-block Chevy rods and ultimately the stroke will be 425 verses the stock for 21 now once the block has been washed with good hot soapy water you can begin the assembly process now I've already dropped into federal-mogul mains and applied the assembly lube and back here we're using a rope type seal that seems to work best with these Pontiacs now when I install one here's a little trick that I like to use there's an old socket there to just roll the seal down in the receiver groove and seat it really well and then trim it leaving about 30,000 sticking up on each end then you can apply this non hardening sealer that way when we put the main cap back on well there's a little bit of crush there and it'll seal real well well now we're ready for the crankshaft which has been stroked by Linate to four and a quarter inches now when you combine that with our sixty thousands overbore hey we're gonna end up with four hundred and seventy four cubic inches we're using ARP studs on the mains which means the centers will get torqued to 100 foot pounds and the outers get torqued to 90 and back here on the rear main will torque them to 120 foot pounds now once all that's done you want to go ahead and spin the crank several times so you can seat that rear seal now the rest of the bottom end uses Eagle rods and Forge Pistons from Ross Racing now we ordered our speed probe Ollie rings oversize so we could file fit them for the proper end gaps top rings 20 thousands second rings or 14 now the federal-mogul race rod bearings are clearanced at two-and-a-half thousand okay 75 foot-pounds we can turn this thing over well our camshaft selection is crucial to getting big power from our big Pontiac so we have Linate grind up this special roller that specs out at 301 degrees duration with a 648 lift on the intake and 309 degrees duration with a 648 inch lift on the exhaust now we had everything ground on a hundred eight degree lobe separation for a strong mid-range now the thrust plate sits the end play on the cam and keeps it from walking forward out of the block plus it eliminates the need for a cam button to make sure our cam stays phased in properly we're using this double roller timing set we got from jim Butler performance the multiple key ways provide timing adjustments up to nine degrees before or after top dead center a previous testing tells us the Pontiac makes the most power at four degrees advanced so after degreeing in the cam we made our marks to give us that and we're ready to boat this down you know with a cam as big as ours and some serious seat pressure on those valve springs well this lifter Valley air you need some reinforcement so what we did was we got some bolt in lifter bore braces from sd performance now not only did they tie in the entire lifter Valley area but they also let us run rocker ratios of up to 165 yeah I got that driveshaft for that oil pump too right here it might just need that now the Pontiac has a pretty decent oiling system but to make sure our stays under pressure we're gonna use this speed Pro high-volume pump that's been modified with an 80 psi relief valve has a 3/4 inch Inlet and a Moroso pickup welded to the body now our oil pan comes from Moroso - and it's a seven quart low profile piece that gives us plenty of ground clearance and it'll fit just about any Pontiac chassis then on the inside is a special baffling that's gonna help keep the oil down in the sump where it belongs now the final piece and our short block assembly is the timing cover we're using a stock GM piece that's been fitted with a missouri high flow electric water pump now for street use both the motor and bearings are larger than their race verge and that's a beautiful pump but don't tighten it up all the way just yet get a little trick that I want to show everybody after the break now don't go away we'll be back with more of our four 55 Pontiac build up right after this whatever for the latest news on horsepower TV check us out online at horse power tv.com hey welcome back to the horse power shop where it's time to finish the build up on our 4 55 Pontiac before we strap it to the engine dyno hey what was that trick you were going to tell us about for a leak-proof seal you want to install the balancer before tightening up that timing cover that way the seal can Center itself then you can cinch everything down oh by the way that balancer boat there torques down to a hundred and sixty foot-pounds great tip now to make 600 horsepower we're gonna need some high flowing heads so we started with some of these Edelbrock Performer rpm heads and turned Jim bottler performance loose on them but one of their street performance porting jobs this will make them flow three hundred CFM on the intake once the grinding is done well you can see the difference here on the intake of course the exhaust gets the same treatment plus they add a set of Fria stainless-steel valves that measure to 11 on the intake 177 on the exhaust set inside a polished 87 CC combustion chamber now these dual valve springs from Linate hold them in their seats four head gaskets we're using these fel pro perma torques now they'll compress to 43 thousands and with our flat top pistons and 87 CC combustion chambers well they're gonna give us a compression ratio of about nine point eight to one and that's gonna let us run pump gas in this ferocious 455 or you could obviously run your mouth on now octane once you have it here gladly after torquing the head bolts down at 95 foot-pounds we drop in our roller lifters push rods and 165 rockers we're using Linate roller rockers with our 455 and just lashed the valves down to 24,000 now to make sure they hold that setting we're using this aluminum stud girdle our high flowing heads are going to need a good induction system so what we're using is an Edelbrock Victor intake that's been ported to match our heads now check this out down inside there's a little turtle that jim Butler performance is added to help redirect that fuel air mixture and give us a few more ponies now because of the intake manifolds design it requires a special Valley tray that bolts in first of course we're gonna top the intake off with this 1050 CFM Holley Dominator carb and we're gonna add a one inch aluminum spacer now this is gonna give us a little more plenum volume and a few more horses there aren't many choices when it comes to distributors for these Pontiacs so we're using the stock piece with electronic upgrade so interface with our Holley Annihilator ignition back there on the dyno now we'll finish it up with a set of they're nine millimeter plug wires with these heat shields well I just realized the valves and once I get this cover type hey we're gonna be ready to make some power pulls [Music] [Music] 612 horsepower on pump gas at that now that's one potent Pontiac okay stay with us we got more horsepower TV coming up if you love cars turn your passion into a profession call Wyoming Technical Institute now check out how a few months of specialized training prepares you for the career of a lifetime WyoTech has the record the experienced faculty and the high-tech equipment to build 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Channel: Michael Smith

Views: 48,688

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Id: tFfT5pEaBAE

Length: 11min 12sec (672 seconds)

Published: Sat Mar 28 2020