I have a 347stoker that has 330hp and 450fpt. It aslo has 10.5 -1 comp. ratio and a 870 holley carb. Would i be able to put a blower on it and is it worth the money to put one on? What type of increase would i see with a blower?
Where did you get those numbers? The HP sounds kinda low, the Torque sounds kinda high... The blower would be wasted on a 10.5:1 compression engine. Need 8:1 or 8.5:1.
i was always under the impression a good 347 would make almost 450 hp. at least most of the crate mfgs. claim this. is that a misnomer?
As above you're a bit high on the compression. A centrifugal will tolerate a little more compression than a roots type blower; they're pretty happy at 9 to 9.5:1 compression on the street. I have run as high as 9.7:1 and 16 psi of boost on 91 octane without intercooling, but that was an all aluminum engine, EFI, coated pistons and chambers, plus water injection. Jody
The guy that built my engine ran it on his old dyno with bent up headers and thats the number he got. He said there probly higher. The engine has allum. heads and roller rockers.
Yup, try to lower the cylinder pressure, compression ratio in itself isn't necessarily a good criteria, too many things affect the dynamic pressure. I would talk to one of the custom cam designers about what you're trying to do. With only four head bolts around each cylinder, small block Fords don't like too much cylinder pressure.
yet people still make 2000+ HP out of them with a big turbo...with only 4 half inch head bolts per cylinder. Doesn't matter if you have 15 per cylinder, if the surfaces aren't flat and the prep isn't up to snuff, they're going to have gasket issues. I'd rather have the gasket let go than something else (block, head, piston, rod, whatever).
Yeah, usually the head lifts and the gasket blows. His 347 would have only 7/16" bolts (he didn't say but I'm assuming a stock block). Never saw a stock 302 block that could handle 2000 hp.
ditto thats what i'm doing i got a 9.5:1 (yeah i know its not 10:1 but....) 302 motor stock crank and rods w/arps, cheap TRW pistons, ported '66 52cc heads and threw a 144 holley blower on it... and prayed real hard. but i got timing right on, use a MSD BTM to play it safe, one step colder plug. and most of all what helps is that overlap on the cam for sure! did i say i prayed real hard. but if this engine was done right it would probably make way more power.. but i don't care right now.. it ain't broke so no fix that's what new motor will be for... if it wasn't for the cam i don't think the motor would have lasted this long now only if i could get the damn thing to hook up.. lol! i think it has to do with those 18 inch wheels... lol! but i think my head gasket is going now anyways... then again maybe its the shot of N2O thats causing that lol! Yes and YES it will make a night a day differance!
