BBC Heads...Which Ones? [Archive]

BigJetDaddy

05-07-2002, 07:09 PM

I am re-building a 396 to put in my V-drive, and I have three sets of open chamber oval port heads to choose from for my build up. I am limited to what I have on hand and my bank account is drained from my jet boat project so I can't go buy a set of aluminum like I would like to. Can anyone tell me which ones would be best to use?
Set # 1: casting 336781 (113cc)
Set # 2: casting 346236 (113cc)
Set # 3: casting 3933148 (122.1cc) these are marked "M.truck" which I believe means they are from a marine motor.
I have the block, crank, rods, and manifold, so I need to choose which heads to use and what cam to get. I want to make around 450hp.
Thanks,
BigJet(and now v-drive too)Daddy

GofastRacer

05-07-2002, 07:50 PM

Your 781's and 236's are simi open chamber, full open chamber are 118cc's. The 148's are Truck heads, they are low compression. Since the budget is low, I would suggest selling the heads you have and try and pick up a set of 049's, they are one of the best factory oval port heads around, you would not have any trouble getting 450hp from your 396..I ran 95mph in my Lavey with a 402 (.030 396) using 049's...Just my opinion.......

machinehead

05-07-2002, 08:40 PM

Of those three the 781 casting is proabaly the best the 236 are very small port heads im not sure about the 148 none of these castings are particularly high performance but if I had to choose the 781 would be it .

boatkeeper

05-08-2002, 12:42 PM

Another BBC head Question
I have a set of rect. port 3919840 what have i got?

BigJetDaddy

05-08-2002, 01:20 PM

3919840
67-69 rectangular port closed chamber from 396 or 427.....Wanna trade???
BigJetDaddy

BigJetDaddy

05-08-2002, 01:21 PM

Sorry about the frown

BigJetDaddy

05-08-2002, 01:27 PM

Sorry about the frown before, can't they change the default to a smiley face?
More Info: If these are on a 396, then there were on a L-78 375hp, if they were on a 427 they were on a L-71 or L72 425 or 435 HP. 109cc
Sure you don't want to trade?
BigJetDaddy

boatkeeper

05-08-2002, 06:01 PM

Just buy the whole setup from me in my other post http://free.***boat.net/ubb/smile.gif
P.S. i don't know why the frown is the default either...
Edit: Thanks for the info too
[This message has been edited by boatkeeper (edited May 09, 2002).]

waterford

05-09-2002, 05:39 AM

BDJ,
tried to e-mail you on old sq. port heads. Have you got a new e-mail address? I have a lot of stuff you want.
waterford

BigJetDaddy

05-09-2002, 06:03 AM

BigJetDaddy's E-mail: Lottawatta@aol.com

BadBoyzSkiRacer

06-05-2002, 04:50 AM

i have a set of 049's on a 454 60 thou over & the engine makes 649 hp & 582 foot pounds of torque.....
just make sure you use a 2.19 in & 1.90 ex valve. port them & clean up the bowles

HammerDown

06-05-2002, 05:53 AM

Originally posted by BadBoyzSkiRacer:
i have a set of 049's on a 454 60 thou over & the engine makes 649 hp & 582 foot pounds of torque.....
just make sure you use a 2.19 in & 1.90 ex valve. port them & clean up the bowles
I'm running the 049's on a 468...I would like to know what else is done to your motor (Compression, cam, intake carb) Blower? Thats giving you that kind of Horse Power.

BadBoyzSkiRacer

07-04-2002, 08:00 AM

[QUOTE]Originally posted by HammerDown:
[B] I'm running the 049's on a 468...I would like to know what else is done to your motor (Compression, cam, intake carb) Blower? Thats giving you that kind of Horse Power.
check your email bro for all the details. let me know if you need more assistance. happy racing Steve

PGF545

07-04-2002, 01:56 PM

I found this web site that might help in your search for Chevy heads...http://www.mortec.com/
Bernie

tahitijet

07-04-2002, 04:01 PM

HammerDown

07-04-2002, 04:42 PM

Originally posted by BadBoyzSkiRacer:
[QUOTE]
check your email bro for all the details. let me know if you need more assistance. happy racing Steve
Sorry Bro... nothing in my E-mail. Still looking to see how ya get 649 Hp+ 582 tq. from a 468 motor. Unless it got a blower and or 15:1 comp. As I said before I'm running a 468, 049's bigger valves all worked up heads, 10:1 comp. with a single carb, NO NOS!....Bring it on...I'm all ears!

BadBoyzSkiRacer

07-04-2002, 05:06 PM

what is your email adress.. i used the yahoo addy u have listed in your profile
rhungwell@yahoo.com

burbanite

07-04-2002, 07:50 PM

Share the info guys, i'm all over that!!!!!!!!!!!!

Kurtis500

07-04-2002, 09:40 PM

Hammerdown, we make over 650. The motor is a 12.5:1, fully flowed 990's 2 1/4primary headers, 1400 cfm of intake and a big cam on racing fuel. Those numbers are quite possible with the BBC naturally aspirated. Theres even a chevy book that gives many detailed combo set-ups with the dyno numbers for baseline set-ups. You probably know this though, but thought I would say it. http://free.***boat.net/ubb/biggrin.gif
I just read your post again, are 049's rectangular port HP heads?

HammerDown

07-05-2002, 03:46 AM

BadBoy...thats my correct E-mail add...ya have to send it thru your home E-mail address.
Curtis500...the 049's are open chamber large oval port. Gotta run....

stressedout

07-05-2002, 06:56 AM

Originally posted by HammerDown:
Sorry Bro... nothing in my E-mail. Still looking to see how ya get 649 Hp+ 582 tq. from a 468 motor. Unless it got a blower and or 15:1 comp. As I said before I'm running a 468, 049's bigger valves all worked up heads, 10:1 comp. with a single carb, NO NOS!....Bring it on...I'm all ears!
I would like to see this combo too. I run a 468 with 049's 2.30 stainless intake 1.90 ex. 10-1 comp 600 lift cam makes 535 hp.

FLYTE RISK

07-08-2002, 06:16 PM

Its not that difficult guys $$$$$$$$$$$$$ just kiddin how many of you have a roller cam$$$$$$ i am a firm beleiver only way togo lots of h.p and maintnence I HAVE a 468 13.7-1 780in. 700 ex. 286 296 at .050 roller cam dart pro 1 heads some mild bowl work. A dart tunnell ram lots of work$$$$ 750 braswells on top motor turns 75-7800 rpm.. thats it no secrets ..i have to admit i am always afraid i will break something that r.p.m. oh yeah with the mag i had and sold the msd i bought helped out alot from the bottom to the top....justs kills the batt......

HammerDown

07-08-2002, 06:40 PM

FLYTE RISK...I here what your saying...but that compression isn't to friendly on a river boat. True what your saying...and a fellow racer friend of mine pretty much spoke to me about the same motor combo that you speek of. I'm just not that intrested in that much compression, or the agg. that goes with it. How about a 540 or even a 572, with around 9:75 or even 10:1 I'm thinking it may be more user friendly...on pump gas!

stressedout

07-09-2002, 04:27 AM

Originally posted by FLYTE RISK:
Its not that difficult guys $$$$$$$$$$$$$ just kiddin how many of you have a roller cam$$$$$$ i am a firm beleiver only way togo lots of h.p and maintnence I HAVE a 468 13.7-1 780in. 700 ex. 286 296 at .050 roller cam dart pro 1 heads some mild bowl work. A dart tunnell ram lots of work$$$$ 750 braswells on top motor turns 75-7800 rpm.. thats it no secrets ..i have to admit i am always afraid i will break something that r.p.m. oh yeah with the mag i had and sold the msd i bought helped out alot from the bottom to the top....justs kills the batt......
I agree it's not that hard to make some big power,but it's not gonna be 650 hp. with 049 chevy OVAL port heads. My 496 in the hydro makes 772 hp. and I turn it 8400, but it is highly modified with 14-1 comp. merlin heads and a 700 hp. nitrous kit.

FLYTE RISK

07-09-2002, 04:33 PM

I agree but with that much comp. how are you retarding the overall?For the nos.. is it a fogger or a plate m.s.d retard or what ?????No offense beleive me just curious....Done both didnt want that much electronics in my flat

FLYTE RISK

07-09-2002, 04:49 PM

One more thing, sorry just remember all of your h.p is made in the heads.. question is how much you want to spend??????Jet daddy if you could find some 990s a good solid lifter cam (ENGLE ph #310450-0806 ) go with it. 450 h.p is very easy to accomplish it is all about how it is put together also machine shop and you checking up on them i.e assy. of motor ha ha good luck....

stressedout

07-10-2002, 04:26 AM

Originally posted by FLYTE RISK:
I agree but with that much comp. how are you retarding the overall?For the nos.. is it a fogger or a plate m.s.d retard or what ?????No offense beleive me just curious....Done both didnt want that much electronics in my flat
I run a fogger and plate. MSD 7al ignition with a multi step retard. 34 degree total then 14 degree of retard with the nitrous.Been running this set up for 7 yrs. with minamal problems.