Thread: Help Me!!454 Blown Motor

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I realize that what i'm about to say may sound very stupid but I hope someone can give me advice. I'm building a 454 bb as a street driven blown motor but taking it to the track occasionaly as well. What's the use if u can't beat it a few times on the track. ANY WAY IT'S A 4 BOLT MAIN WITH AFTER MARKET RODS, TRW BLOWER PISTONS AND FORGED CRANKSHAFT AND SFI APPROVED BALANCER, BLOCK HAS BEEN O-RINGED, PUNCHED OUT .030 OVER NOW 468CID, WITH A COMP CAMS hyd. camshaft (AND SPRINGS TO MATCH) THE CAM SPECS OUT @280ADV. dur and 232 & 237 dur.@.050, .547" in. and ex. vavle lift w/114 degree lobe seperation, blower is 8-71 with a planned boost between 6.5 to 8lbs of boost, two Carters 750 cfm preped for a blown motor. HOWEVER I DID NOT PAY CLOSE ENOUGH ATTENTION TO THE HEADS. I'M on A BUDGET AND I HAVE DONE MOST EVERYTHING MY SELF EXCEPT FOR BALANCING & ROD FITMENT, AND 3 ANGLE VALVE JOB AND O-RINGING THE BLOCK. THE GUY AT THE HEAD SHOP SAID I DID A VERY GOOD JOB OF PORTING, POLISHING AND PORT MATCHING THE HEADS FOR A NOVICE. He said, "THAT SHOULD REALLY WAKE UP THOSE SMALL VALVE HEADS ALOT" and I said what do YOU MEAN SMALL VALVE HEADS? AND HE SAID SORRY FRIEND THOSE ARE NOT 2.19 OR 2.25 INTAKE VALVES, BUT 2.06 in. 1.72"ex. HEADS..........GRRRRRRR PLEASE SAY IT AINT SO. THE CASTING NO. IS 3904390 OVAL PORT. ANY WAY IS THERE ANY HOPE? HE SAID FOR ME NOT TO MAKE A MOUNTAIN OUT OF A MOLE HILL, HE SAID BECAUSE IT'S GOING IN A LITE CAR ANY WAY AND WITH GOOD FLOWING EXHAUST IT WILL PERFORM FINE AND THAT ON HORSE POWER VS THE SAME SETUP WITH EDELBROCK HEADS I'M ONLY GONA BE DOWN ABOUT 25 TO 38 HP WITH THE SMALL VAVLE HEADS, AND I AINT GONNA NOTICE IT ESPECIALY SINCE THE TRACK I GO TO IS ONLY AN 1/8 MILE STRIP. IS HE RIGHT OR SHOULD I DUMP THE HEADS AND START ALL OVER AGAIN? PLEASE SOMEONE TELL ME SOME SOUND STUFF ANY ONE OUT THERE GOT ANY IDEAS. I FEEL LIKE A JACK-ASS.

I agree with tech, run the combination you have, remember if you change heads YOU MAY have to change the cam for the deeper breathing heads,avoid all the hassle run what youv'e built, that should be plenty of fun.

Brian, have you driven a 454 blown motor yet? I ran junk 454 motors, with wore out blowers on the st. for about 15 yrs. and i have yet hooked one of them up. I think your gonna be pleasantly suppressed with what you have. build what you got, be sure to get enough fuel to the pistons, get it hooked up and hold on, the blower will do the rest.




ps check my pics. out.

Hi Brian,

We ran the same motor you've described until last summer when we changed to rectangular port heads. It feels a bit stronger now, but that is purely subjective (trying to rationalize the $1200 spent). It will work great, save the money to work out the chassis issues as it trys to deal with the extra 250ft/lbs of torque.

Be careful with the head gaskets on the "O" ringed block. I assume you're using an anealed solid copper gasket, we had a small water leak the first time using a spray on coating. Took the heads off and re-anealed the gaskets to dead soft. We then used a SMALL bead of high temp silicon around each of the water passages on both sides of the gasket after a good cleaning of all surfaces.

Regards, Mark

Originally posted by MAW
Hi Brian,

We ran the same motor you've described until last summer when we changed to rectangular port heads. It feels a bit stronger now, but that is purely subjective (trying to rationalize the $1200 spent). It will work great, save the money to work out the chassis issues as it trys to deal with the extra 250ft/lbs of torque.

Be careful with the head gaskets on the "O" ringed block. I assume you're using an anealed solid copper gasket, we had a small water leak the first time using a spray on coating. Took the heads off and re-anealed the gaskets to dead soft. We then used a SMALL bead of high temp silicon around each of the water passages on both sides of the gasket after a good cleaning of all surfaces.

Regards, Mark

if you dont mind me asking what sort of time was you running in the 1/4 mi. with that motor ?

Mike, it was in our 21' ski boat so no 1/4 mile times.

Brian, as a point of reference the first cam we ran was a medium hydraulic from Crane with 226/236 (286/296) and .534"/.553". It was a carry over from the original normally aspirated motor. Where it had been a little bit lumpy before it was positively docile with the blower.

Regards, Mark

This post is not meant to insult anyone or make anybody mad, im not talking down to anybody its JMO and im sticking to it. No ill take that back, if anyone can convince me how it can be done ill take it back. im talking st. car, not drag car.
the reason i was asking about the times is, im seeing people all the time on here with 454s, 8 lb. boost, 2-750 carb. all the cam in the world, big heads and everything else you can think of and still looking for more hp and its hard for me to believe they need it. i ran total ass junk most of the time and had more power than i needed on my blown st. cars. i don't believe you can build a blown st. car with that motor in it and drive it to the track, put all the slick you can get under finders and hook that car up. either i was accidentally building some bad ass motors or somebody else is just building plane bad motors. i was running 3 blown motors at the same time with all kinds of dif. stuff in them and one thing i didn't have to do was go looking for more power. that motor brian is talking should run high 6s or low 7s easy in the 1/4 mi. i never tried to run any of the 454 blower st. cars i had at the stripe because there was no way to get it to hook up and still have something you could drive home. i had a blown stock 350 in an el camino that i broke axles, drive shafts, trans. and everything else you could think of with that, so what the hell you gonna do with a blown 454. i stop running the 350 el camino after a while and took all the half broke stuff laying around the shop and built a vega. wagon just for the strip and put that stock 350, 1 750 carb., stock lifters, mild cam, stock rocker arms, good heads, 4-71 blower with 4 lb. of boost,(the blower was that wore out) 7.5 comp. ratio, 3000 lb. car. no stall conv., idling at the light, 33" tall slicks, 4:10 gear , 400 trans and shifted at 5000 rpm, and could run a 10.9 all night long. without the 4 lb. of boost it would have been a 14 sec. or slower car id love to see a st. car driven to the track with a good 454 with 8 lb. of boost run the 1/4 mi. just one time.(with any kind of consistence) im talking flat out, it ant gonna happen. i went to the Richmond drag strip for about 10 yrs. off and on and i was the only blower motor i saw there unless it was something special going on and i never saw another local car with a blower there, and there is a reason. they are not practical motors to go to the drag strip with every now and then. im talking building it for all its worth, not de-tuning it so it cant spin the wheels, if you gonna do that why spend the big bucks. so tell me where i went wrong.