Blown Pontiac 428 SD

[kolbpilot]

Very nicely done. Quite a compact package when all said & done. It 's nice to see vintage iron in a lively state of tune. GM was in its heyday with all of its divisions designing & building their own powerplants. One can argue forever on who did it best but one thing for certain is, no one did it bad, especially Pontiac.

[guyfromboracay]

I could just fall asleep to the sound of that engine purring

[slippery396]

is that a 421 with a .040 over bore ?

[MidnightinSavannah]

That is one sweet 428,spotts builds a great motor.

[pontiac40069]

god that 421 steel crank has to be a rare beast. but this engine is very sweet

[lordofblacksmoke]

are all 428 super dutys

[spotperf]

none are - we named this a 428 SD because its a 428 block 4 bolt block with a 421 SD forged crank - old school and new school

[lordofblacksmoke]

what stroke and bore are you using for that engine

[darthtader318]

that sounds is amazing; its biblical! Pontiac POWER!

[Poncho389]

I think Im in heaven!

[starchief59]

Where did you get the manifold for the blower? I'd love to put a blower on one of mine

[spotperf]

Pete got everything from BDS - best set up for a street Pontiac - has cooling. I needed to have it milled though for fitment

[coutts1993]

Nice motor. It looks like the left header is bent?

[spotperf]

yes - junk headers for my start up stand - only used to break in engines.

[deannaber]

i agree pontiac olds cadillac buick ,can have and do!! out run chevies,i have seen 326's350 pontiacs stock" out run 350's,i'm just a gm guy,would rather not see "a chevy in any pontiac",but as long as were staying with american iron,and the guy isnt bad mouthin the old indians,im ok? with it...

[deannaber]

nicccce

[32spitzer]

Dude nice "Start Up Stand" cool set-up.Good luck with it.

[tl1000beast]

Very nice I love seeing Pontiac Stuff on here i have a project 69 Firebird im still working on. NICE VID

[torchmann4801]

new flat tappet cams are supposed to be broke in at 2,000 rpm for 15-20 minutes to mate the lifters to the lobes and work harden the wear surfaces. I'm guessing roller cams are different??

[spotperf]

no break in needed on roller cams, also different shaped lobes, so more power. This engine has a custom grind hydraulic roller cam.

[Nightshots]

I have the 428 on my 1969 FIrebird, just finished the rebuild turned out 480 HP at 5000 RPM's huge low end torque, ran beautifully.

[mitchelltom32]

thats badass i see you have edelbock heads on it they are great ive ran mine for 3 years no problems

[augustoescobar50]

nice engine man its good to see that you have a blown pontiac engine going into a car not another blown chevy going into a pontiac lol.

[pwkid]

haha so true. You know what they say!

"True Indians Dont Wear Bowties"

[dajudge1969]

what does that engine make for power?

[MotorCityThreads]

mmmmmmmm. Daddy likey

[jasonb32]

blowers / superchargers (ram air) into the engines, crating higher compression-compression = power

just dont blow out the bottom end- or block getting there--

nice motor man- im building my 468 slowly- need cash

[xavier2704]

Love that backyard engine stand

[spotperf]

thanks - but it is not "backyard" it is a modified Sun test stand for AC, and emmisions components from the 80's. It came with a Buick V8 installed, but now only has Pontiac V8's being tested/broken in on.

[jasonb32]

sounds good any new clips?

is it a actual 428 is bord out ect...

[Dummerd]

What does it matter? You can't hear the difference from a .030 over 428 from a stock 428. Boring an engine is to make the cylinder walls straight to achieve good ring seal for performance. You can actually bore one too far, too.

[jasonb32]

yea you can- the more you open a cyl- the more air volume it has drawn in it = more compression

check out top fuel ,take a look at the compression there using / dirt bikes-ect...

anything that uses compression to run

you can tell a healthy engine -from a low compression,(or worne) motor

you can tell when someone uses race fuel as well

[Dummerd]

But you can't HEAR that small of a change on a 400+ cubic inch engine.

What you are saying is true...a few more tenths of a point in compression can be gained if the cylinder head and piston dome volumn are the same. But again, you can't hear THAT small of an increment. Please reread jasonb32's post and understand WHY I replied what I did to him.

[jasonb32]

yes you can- each cyl is bored out thats more volume in each- trust me you can tell

[Dummerd]

I want you to go to race track and identify everyone's bore by ear. Kidiot. I hear your mom calling....

[spotperf]

yes 428 block - bored .035 (434 cid) custom dished pistons. Crank is a vintage 421 Super Duty forged unit. Block is filled, billet steel 4 bolt main caps. Hydraulic roller cam.

[ztwntyn8]

love the way it surges at idle. what the hell are you gonna do with that?... boat maybe?

[spotperf]

going in 1968 GTO - can't wait to see it on the street and track

[dajudge1969]

congrats man for staying pontiac powered beautiful engine

[Pontiac462]

Gotta love them blown Ponchos! ;) Paul builds some nice stuff!

[1Bandit455]

Very cool--Pontiac power.