12/1/2018 0 Comments 400 Pontiac Engine GuideVatanen answered 7 years ago You mean 3-row radiator?Well for my experience,Pontiac 400 ain't so sensitive about overheating.Someone said something that these engines overheat easily,well i think that they are talking about chevy 400 small block,wich has 'siamese' cylinders.It means that water cannot go between two cylinders.That's why it overheats easily. If you don't try tweak more than 400hp,youl do fine with solid radiator,good pump and thermostat.How i know? Used Pontiac 400 EngineWell i live in Finland so i know what kind of weather we have(same as in Sweden:)),and i helped my buddy to build his 71 gto with 400 engine,bored to 408,Edelbrock rpm cam,ram air head's with some pro porting.Even with 4.11 gears,it barely overheats,and it has electric waterpump.With regular pump,it would not have this little problem. And yes,it's really fast.I'm talking about low 12 or high 11sec car on Q-mile. What makes Pontiac great is the torque,it's hard to tweak 400-450-500hp on these babies but even with factory settings,on 300 to 350hp range,it will put about 500footpounds on torq.And this is about 2-3000rpm.Can you spell burn-out? Vatanen answered 7 years ago To Antoine: If you wan't to help and don't know anything about the topic,don't type anything.It's so easy.Sit back and learn.Or move to the next topic. Don't try to guide anyone if you really don't know it for a fact. You call me 'know it all'?Well kiddo,you put bananas in your nose at the same seccond when i corrected you.So who is the big baby? Yes,i do know little bit more than you,'know it all on theory and internet',but only because i've worked with these cars and engines on street and racetrack about 10-15years now. Abacus watch manual. Feb 22, 2015 - Cylinder Heads Performance Guide for Pontiac V-8 Engines. 2/22/2015 12:08. Specialized castings can flow more than 400 cfm. It's easy to. The traditional Pontiac V8 engine was manufactured from 1955 through 1981. The engines that are currently most popular were manufactured from 1964 through 1978. These engines were available in the following cubic inch displacements: 326, 350, 389, 400, 421, 428, and 455. Jump to T/A 6.6 - The 4-speed manual transmission was also available behind the 400. A Pontiac sourced engine, and those ending in Litre were non-Pontiac. That includes Chevy small and bigblock,Mopar small and big,Fords and yes,on Pontiac's and even on Olds. No hard feelings, take it easy and don't stres about when you don't know something and you get corrected. Swedishpelle answered 7 years ago Vatanen what do you think about this setup. Pontiac 400 Engine For SaleEdelbrock 60579 alu heads (Cylinder Head, Performer, Aluminum, Assembled, 87cc Chamber, 215cc Intake Runner, Pontiac, 289-455). Edelbrock 7157 cam and lifter (Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 308/320, Lift.470/.470, Pontiac, V8, Kit) Edelbrock 1407 carb(Carburetor, Performer, 750 cfm, 4-Barrel, Square Bore, Manual Choke, Single Inlet, Silver, Each) Eagle Specialty Products B51400064 (Actual Engine CID 468 Bore (in) 4.190 in. Bore (mm) 106.426mm Engine Stroke (in) 4.250 in. Pontiac 400 Engine PartsPiston Material Forged aluminum Piston Style Flat top, with two valve reliefs Piston Head Volume (cc) +5.00cc Wrist Pin Style Floating Piston Ring Facing Material Plasmamoly Crankshaft Included Yes Crankshaft Material Cast steel Rear Main Seal Style 2-piece Balanced Yes Engine Balance Internal Connecting Rods Included Yes Connecting Rod Material Forged 4340 steel Connecting Rod Beam Style H-beam). I´m also going to change intake manifold, a new set of headers that fits the heads, i`m going to change the gear ratio to about 3,50-3,70 somewhere (going to let a pro advice me and let him do the work) my transmission is a 350 not ideal but going to reinforce it and in the future change to a th400 transmission. Vatanen answered 7 years ago Thi sound decen't combination,but be carefull with compression.Long stroke and hydraulic tappet cam can cause cylinder pressures to go way up.This is made with the closing degrees of intake valve.It's called dynamic compression.Static compression is what you hear all the cat's talking,like 'i have 10 to 1 compression. Hyd tappet(flat or roller) cams may have really low closing degrees to create enough pressure on the cylinder to create power=you don't need to have so much static compression. Mechanical cams have more degrees on closing angle=they need more static comp to create enough dynamic to make good compustion. I't all about cylinder pressure and how to create it.Too much and you will hear knocking inside your motor.Too little and your engine will be sluggish. But back to your combo: -Heads are good -Cam seems to be ok(i don't know how much compression you will have,calculate it carefully to see if you have the right cam).If you have the money,go with roller cam.It will give you more 'rumpety rump'-sound and more gut's on low rpm.
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