building a blower engine [Archive]

slotracer

07-16-2003, 05:12 PM

ok guys here i go i decicded to build a blower engine for my southwind. i got a dyers 6-71 with 2 afb 750's to start with. now on with the rest of it. if i build a mild 454 say 60over appox 8.1 comp. 990 heads could i use a 2 bolt block?
and what cam would be good? is there any good books on building blower engines out there?
help i want to start getting together parts for
my new toy. thanks pat(slotracer) :D

Blown 472

07-17-2003, 05:02 AM

Talk to info.

Big Proppa

07-17-2003, 04:12 PM

From what I understand, 2 bolt main blocks are OK up until about 700 horse than it gets risky. Most people want to make as much HP as possible but in your case what are you looking to get out of this motor.

BrendellaJet

07-17-2003, 04:52 PM

if you are worried about the strength of the 2 bolt, you could always have it drilled for 4 bolt caps

Cs19

07-17-2003, 07:17 PM

convert the 4 bolt. Pat, do you need some 990 heads? i will be in your area in a few weeks if you do.

GofastRacer

07-17-2003, 07:42 PM

If you have a 2 bolt now, use splayed caps don't use factory caps they will walk with a blown motor, also with factory caps that extra bolt hole removes material out of the main web!. eek!

slotracer

07-18-2003, 05:08 AM

i am looking to get between 650-700 h.p out of it
nothing real wild. this is my first attemp at a blower engine so i want to check all my bases.
chris how much are you asking for the heads?
is there a difference in cranks ie. steel of not?
pistons? and rods. thanks for all the help guys.
pat(slotracer) :D

Cs19

07-18-2003, 08:12 AM

$500. The 990 castings... i will be in your area in the sac. delta for the first few days of august if your interested. They will most likely need a valve job as they have hours on them, They come with crane roller rockers too. If your interested let me know. Thanks

HavasuDreamin'

07-18-2003, 08:16 AM

That is a pretty good deal on the heads. From the peanut gallery, I would have the 2 bolt block drilled out to accept four bolts. :cool:

Cs19

07-18-2003, 02:30 PM

heads sold today . let me know if you need parts pat,I know of a few motors that are being parted out right now, just let me know if i can help out. :D

slotracer

07-18-2003, 05:22 PM

chris i am looking for a 4 bolt block if one is
avalible if not i will check into converting mine
also looking for a good steel crank and set of rods and 60 over pistons.
thanks pat(slotracer) :D

Cs19

07-19-2003, 03:32 PM

you should be fine with that block you have after being converted. last i heard hbjet had some really nice rods and a brand new crank as well. I dont really know of any blower pistons though, i will check around.

Cas

07-21-2003, 05:41 PM

Pat,
Give DW a call with Engine Rebuilders Warehouse. You will find the number on the LBBA discounters list.
Although it's still under construction, you can check out their website at FastEngines.com (http://www.fastengines.com)

Cas

07-21-2003, 06:10 PM

hmmmm, forget that link for now, seems it's up for sale :D

slotracer

07-21-2003, 06:55 PM

cas i tried that website but its for sale :rolleyes:
pat(slotracer) :D

GofastRacer

07-21-2003, 07:21 PM

SLOTRACER:
chris i am looking for a 4 bolt block if one is
avalible if not i will check into converting mine
also looking for a good steel crank and set of rods and 60 over pistons.
thanks pat(slotracer) :D Is you're two bolt an early block?, if it is it would be a lot cheaper to convert yours than to buy one, besides then you could use splayed caps and have a good stout bottom end!... :cool:

slotracer

07-21-2003, 07:22 PM

how do you tell a early block?
thanks pat(slotracer) :D

GofastRacer

07-21-2003, 07:28 PM

Thick cylinder walls!.

HBjet

07-21-2003, 11:19 PM

I would sonic check your block before you put anymore money into it. As for the 990's, this are bitchin heads for the money. I run a pair that have been gone through.
Here is a side by side photo with one of my 990's after they where gone through and a stock 990.
http://www.***boat.com/image_center/data/500/20beforeandafter.jpg
HBjet

slotracer

07-22-2003, 04:29 AM

randy i will call you later today about the crank and rods. how much do you have into yours heads with all the work in them? pm me so we dont get chet involved with this issue i am not looking for a pissing match on this post just good infomation. thanks pat(slotracer) :D

Heatseeker

07-22-2003, 07:26 AM

Pat, your porting money can be better spent. On a blower motor, the porting doesn't help as much as on a normally aspirated engine.
Just what I've been told...

Blown_Rob

07-22-2003, 01:42 PM

well good luck ..but let me tell you and im talking from experence dont get cheap on your parts your heads may be nice but your block is your foundation for your power plant ,i did the same thing and i used a stock 4 bolt main ,and i ran i hard and it had started to crack from the stress of the power ..so the extra thousand bucks will save you the headache in the long run buy a dart block .......

HBjet

07-22-2003, 03:18 PM

Blown_Rob:
well good luck ..but let me tell you and im talking from experence dont get cheap on your parts your heads may be nice but your block is your foundation for your power plant ,i did the same thing and i used a stock 4 bolt main ,and i ran i hard and it had started to crack from the stress of the power ..so the extra thousand bucks will save you the headache in the long run buy a dart block ....... Hey Rob, how much HP did you run with your 4-bolt block? Just curious, thanks.
HBjet