Has anyone ever built a 302 with the 177 Weiand/Holley blower? I plan on bracket racing with this combination and I'm just looking for some tips. Is it possible to dip into the low 11's/high 10's with this combo? I do plan on stroking the motor to either a 331 or 347. This car will be street driven as well on pump gas. Thanks for the input, Myt Mav
not for sure but I think maverickman may have one on one of his cars? as for being possible to get those numbers.anything is possible... however I think that combo may be a little small myself to acheive it. if your wanting to go supercharged why not just step up to a 6-71 or a centrifical from paxton/vortec/ext?
PM Maverick Man, I think that is what he has, and he says his numbers are not all that impressive. But, his is not stroked, I don't think, so you should be able to pick up some time there. Post back and let us know...
Yeah, Maverick Man is the only member here that I know of with one. His combo is sweet, but somewhat mild. There was a big bumper Comet on eBay about a week ago with the little blower, and it was pretty seriously modded. I forgot what they listed for power or times though. I bet you could get 11s pretty easy with some stroke and the little blower, but it would require plenty of thought to do it right. A turbo or turbos would probably get you more power, and they would still fit under the hood and be streetable just as the little blower. My .02 Dave
Thanks Guys, I was considering the combo because it retro and the 302 fits better than the 351w I had in it before. Anyway, there are two fellas at the local track who run the blowers with great success. Both are running the 350 gm crate motors with the smaller 144 blowers. Their times are in the low 12's for the Jeep and high 11's in the Nova. Keep the inputs coming. Might change my mind and go with a 351 stroker and curse those headers and shock towers, but it might be worth it.
Wouldn't stroking it to a 331 raise the compression ratio to high for a blower? I thought 8.5:1 was optimal and 9.5:1 would be pushing it?
A 393w would be a fraction of the cost of a blower setup... Not even counting the cost of the stroking to 331/347 you are considering. A 408w wouldn't cost any more than the blower cost. (Talking about the cost over the standard 351w rebuild.) ModMav71: The compression ratio is determined by many factors and can be built in as high or low as one needs, no matter the cubic inches.
I know, but almost all stokers you see are running 9.5:1 or higher. I know it depends on the heads, combustion chamber cc's, connecting rod length, and all that.
i think you got my PM back right but like i said a 347 built right should run and easy 11 with any one of those blowers on it. but remember anything above 9.5:1 your gonna need to run some good gas!!! ie: 9.5:1 compression and 6lbs of boost = 13.1 or so! ping! bang! btw i'd also run a MSD BTM.. gotta be the best thing out there for controling timing / boost. personally if your going for the wow factor 6-71 or mini roots like what i got... but if your going for pure power and go with a paxton or vortec. you can push way past 12 lbs of boost with one of thoses, not to meantion you can intercool one of them puppies too! i will tell you this... the holley blower on my car was proabaly the one and only thing that really bolted right on! and actually fit with no problem. can't say that much for most aftermarket parts. paxtons and vortecs are a pain in the arse! and thats no joke! everything won't bolt right on.... and if it does your still gonna need to fab more then a few things up. you should be able to run in the 12's with out a blower... unless the motor is like really stock like mine then yeah its the fast way to bolt on some power and still have it reliable and run 12's like raito411 said "The compression ratio is determined by many factors and can be built in as high or low as one needs, no matter the cubic inches." you can get what ever decked block and whatever milled heads and just have the pistion company cut you a set base upon those specs to get the correct compression raito. i would suggest 8.5:1 i have another motor that i'm starting to peice together 331 with alum heads with that compression.. 8.5:1 ... and BTW my blue car has 9.5:1 with 6 lbs.... its scarry.... though i cam is over lapped alot so most of the boost is blowing out the exaust anyways. which brings the point of having the right cam for your blower.. you don't need one but it would run better if you did have the right specs. mines not... its 9:1 don't belive what the magazine said.... mine was a prototype at 9:1 where production was 9.5:1.. but still not bad for a 9:1 motor with unported heads and a mild hyd cam still laydown a best of 7.61 and lay down 7.80's all day long
I couldnt recall if the holly unit had interchangable pullies or not, I was thinking that the boost set up on them was similar to factory supercharger applications.(around 4 to 5 lbs.) nice to know it bolted up for you without the usual aftermarket "fit"... you probably know that the 6-71's have intercoolers avalaible as well, and the boost can be set up for as high as necessary to break stuff ...the downside to the intercoolers on the roots units are added height .
yeah they do... 6 and 9 lbs pulleys. holley was supposed to send me a 9 pound but i guess they never got around to doing it. i think it will blow something up though.. lol! and like i said on this blower it gotta be the best and easiest bolt on for HP! easy then nitrous if you ask me. with nitrous there way to many wires and there are too many things you gotta keep an eye on. as for the 6-71.... yeah i i just never got he just of a 6-71 unless the car was like tubbed or something.. no offence to people that have them with small tires but for some reason the car looks un-proportionate to me... i like fast and look good besides those huge hunkin blowers need to be so under driven on a small black. Centrifugals are just more efficent!
