question about BBC heads - Chevelle Tech
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post #1 of 17 (permalink) Old Dec 28th, 12, 5:35 PM Thread Starter
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dave
 
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question about BBC heads

i've been studying the topic of budget BB on here and have a question. Starting to get parts together and figured I would start with the heads. It seems that most are in agreement that 781's or 049's are street friendly. I've never built a motor but i'll try...when looking for a head and the seller decribes that the motor" threw a rod "---what COULD that do to the head and should i stay away....next question---found a deal on 781 heads off a Merc cruiser engine, any differences? anything about a boat motor that would excessively wear on the heads..maybe more prone to overheating ? Thanks in advance...most of the heads i find for sale are a good 2-3 hour drive away..just need to know what to stay away from before i waste a trip
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post #2 of 17 (permalink) Old Dec 28th, 12, 5:55 PM
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Re: question about BBC heads

If the rod did break ,it likely had contact with the head.
That would be easily see by comparing the adjacent chambers to the one in question.
As for the marine use,look inside the water passages for corrosion if this was a salt water engine.
If there a couple hours drive,I suggest the seller provide pics so you can see if they warrant a drive.
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post #3 of 17 (permalink) Old Dec 28th, 12, 7:05 PM
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Re: question about BBC heads

Check with your local machine shops......many times they have some they can make you a deal on.

72 ss 454 "W" code,w/cowl induction (how many left?)
matching # LS5 454+.060" 9.2 :1, 2.19/1.88 valves,Comp HR cam 289/295 234/240 .613/.613 110* (dyno'd @ 557hp @ 5400 & 583tq @ 4100)
matching # M22 w/CF dual friction clutch.
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post #4 of 17 (permalink) Old Dec 30th, 12, 2:08 PM
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Rod
 
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Re: question about BBC heads

I don't think I'd travel 2+ hours for heads unless it was a screaming deal or they were fresh and ready to bolt on. You should easily be able to find a pair on Craigslist closer to you than that.

Any automotive swap meets coming up in the Spring near you? There are usually some pretty good deals to be had. Illinois probably has a ton of swap meets.
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post #5 of 17 (permalink) Old Dec 30th, 12, 4:32 PM Thread Starter
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Re: question about BBC heads

problem is where i live in illinois...3 hrs from chicago...2 + hrs from indy..in the middle of nowhere with no gearheads nearby i guess. I've been checking craigs list for a few months now.. not any swap meets that i'm aware of either. I guess i will try the local machine shop as suggested (only one i think). Not much of a choice but to drive if they don't have anything.
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post #6 of 17 (permalink) Old Jan 1st, 13, 11:58 AM
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Re: question about BBC heads

Davec5, where are you? I'm south of springfield and have a set of 781's.
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post #7 of 17 (permalink) Old Jan 1st, 13, 12:18 PM
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Re: question about BBC heads

Stay away from boat parts. Ive been there and most of those parts are rusted or have problems. Look into Johns heads in the post above. John you can pm me for my address to send the finders fee to. LOL
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post #8 of 17 (permalink) Old Jan 1st, 13, 4:38 PM
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Tim
 
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Re: question about BBC heads

Middle of nowhere in Illinois... i'd love that problem . Take me deer hunting, and i'll give ya a set. 049's or 781's. lol
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post #9 of 17 (permalink) Old Jan 1st, 13, 10:18 PM
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Dennis
 
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Re: question about BBC heads

Quote:
Originally Posted by davec5 View Post
i've been studying the topic of budget BB on here and have a question. Starting to get parts together and figured I would start with the heads. It seems that most are in agreement that 781's or 049's are street friendly. I've never built a motor but i'll try...when looking for a head and the seller decribes that the motor" threw a rod "---what COULD that do to the head and should i stay away....next question---found a deal on 781 heads off a Merc cruiser engine, any differences? anything about a boat motor that would excessively wear on the heads..maybe more prone to overheating ? Thanks in advance...most of the heads i find for sale are a good 2-3 hour drive away..just need to know what to stay away from before i waste a trip

yes those are good heads you listed above but keep in mind that your not going to hurt yourself getting other casting numbers, as long as they are oval port (not peanut port or rect. port) you will be fine, just find a good used set of oval ports and continue on with the rest of the build, you will be open to all chamber sizes and you can adjust your piston selection to your head chamber once you have a set of heads . That way you can adjust your compression as needed.

I couldn't begin to tell you how many different head castings I have had over the years on my different engines and they all performed well from a budget minded street engine. I have had heads that was factory 96cc chambers all the way to about 124cc.

Bottom line if your on a budget find the best deal you can on any oval port head. Then spend a few dollars and grind down all the casting flash yourself in the runners and bowls and those heads will be good to rocket you into 12's if not better depending on the rest of the build.


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post #10 of 17 (permalink) Old Jan 2nd, 13, 9:47 AM Thread Starter
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Re: question about BBC heads

thanks for all the help everybody..ddeenis--what other casting #'s are ok?..it looks like I will follow one of the"recipes" here on this forum..plenty of them ! and they mostly use the 781's and 049's it looks like... most likely the heads will be kept stock at least for awhile..I will never make it to the track so bigger valves are just more money i have to spend that i really would rather not at first. The engine is going in a 72 wagon with a muncie m20 4 speed and a 10 bolt rearend
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post #11 of 17 (permalink) Old Jan 2nd, 13, 9:48 AM Thread Starter
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Re: question about BBC heads

johnretired...you have a PM
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post #12 of 17 (permalink) Old Jan 2nd, 13, 9:51 AM Thread Starter
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Re: question about BBC heads

grovey...not a dear hunter...but i have a heluva pheasant dog !
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post #13 of 17 (permalink) Old Jan 4th, 13, 11:51 AM
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Re: question about BBC heads

Quote:
Originally Posted by davec5 View Post
thanks for all the help everybody..ddeenis--what other casting #'s are ok?..it looks like I will follow one of the"recipes" here on this forum..plenty of them ! and they mostly use the 781's and 049's it looks like... most likely the heads will be kept stock at least for awhile..I will never make it to the track so bigger valves are just more money i have to spend that i really would rather not at first. The engine is going in a 72 wagon with a muncie m20 4 speed and a 10 bolt rearend
BBC Cylinder Head Casting Numbers

RECTANGULAR PORT - Valve size 2.19 intake, 1.88 exhaust
Casting # Years CID Chamber HP/RPO/Comments

3904392 1967 427 Closed 430, 435 L-88/L-89, 106.8cc, 1.72 ex

3919842 1968-69 396 375 L-89 427 Closed 430, 435 L-88/L-89, 106.8cc, 1.84 ex

3946074 1969-71 396,402 375 L-89, 427 430 L-88/ZL-1 454 Closed 425, 465 LS-6/LS-7, 118.Occ, round ex

10051128 1990-94 454 Semi Open 72cc, IP 400cc, bowtie, sym port

14011077 1989-94 454 Open 118.Occ, IP 295cc, replacement, C port

14044861 1989-94 454 Open 425, 105.Occ, IP 380cc, bowtie, W port

3856208 1965 396 Closed 375, 425 Z-16/L-37, 108.9cc, 1.72 ex

3873858 1966-67 396 375 L-78 427 Closed 425 L-72, 108.9cc, 1.72 ex

3904391 1965-67 396 375 L-78 427 Closed 425, 435 L-71/L-72, 106.8cc, 1.72 ex

3919840 1967-69 396 375 L-78, 1.72.ex 427 Closed 425, 435 L-71/L-72, 425 COPO, 106.8cc

3964291 1969-70 396/402 375 L-78, Intake Port 325cc 427 425, 435 L-71/L-72
454 Closed 450 LS-6, 108.Occ

3964292 1970 454 Closed 450 LS-6, 109.Occ

3994025 1971 454 Open 425 LS-6, 118.Occ

3994026 1971 454 Closed 425 LS-6, 118.Occ

6258723 1971 454 Open 425

6272990 1971-94 454 Open 425, 118.Occ, IP 325cc

14096188 1987-94 454 Open 425, 118.Occ, IP 325cc, replacement

14097088 1989-94 502 Open GEN V, 118.Occ, IP 325cc, replacement

OVAL PORT - Valve size 2.06 intake, 1.72 exhaust

Casting # Years CID Chamber HP/RPO/Comments

330864 1970-81 366/427/454 Open

330865 1970-84 366/427/454 Open

336765 1973-84 427/454 Open

336781 1973-85 454 Open 113.0cc

343771 1968-85 366/427/454 Open

343772 1976-84 366/427/454 Open

343783 1975-78 454 Open car & truck

346236 1975-87 454 Open 113.0cc

346238 1975-87 454 Open 113.0cc

353049 1970-73 402/454 Open 113.0cc

473328 1968-85 366 Open

3856206 1965-66 396 Closed 325 97.2cc

3856213 1966-70 366 Closed truck

3872702 1966 396 325, 360 L-34/L-35 427 Closed 390, L-36 98.4cc

3876875 1966-70 427 Closed truck

3904390 1966-67 396 325, 350 L-34/L-35 427 Closed 390, 400, L-36/L-68 98.4cc

3904393 1966-68 366 Closed truck

3909802 1966-67 396 325, 350 L-34/L-35 427 Closed 385, 390, 400, L-36/L-68 100.9cc


3917215 1967-69 396 325, 350 L-34/L-35 427 Closed 335, 385, 390, 400 100.9cc

3917219 1966-70 366/427 Closed truck

3931063 1969-70 396 325, 350 L-34/L-35 427 Closed 335, 385, 390, 400 100.9cc

3933148 1969 366/396 Open 2V/427 265 122.1cc car & truck

3933149 1969-70 427 Open 122.1 cc truck

3964280 1966-70 427 335, 385, 390, 400 454 Closed 345, 360, 390 LS-5

3964290 1969-70 396/402 325, 330, 350 427 335, 385,390, 400
454 Closed 345, 360, 390 LS-5 100.9cc

3965198 1969 396 truck

3975950 1968-70 366/427 Closed truck

3986133 1970-85 366/427 Closed truck

3986136 1970-84 366/427 Closed truck

3993820 1971 402 300, 330 LS-3 454 Open 365 LS-5 113.0cc

3999241 1972 402 240, 300, 330 LS-3 454 Open 365 LS-5 113.0cc

6272292 1971 402 240, LS-3 454 Open 270, LS-5

10101136 1991-94 454 Open truck

10121033 1978-88 454 Open truck

12352783 1979-93 454 Open truck

14025175 1983-93 454 Open truck

14081044 1986-90 454 Open truck

14092359 1986-89 427 Open truck

14092360 1985-89 454 Open truck

14101398 1986-90 454 Open truck


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post #14 of 17 (permalink) Old Jan 4th, 13, 5:33 PM Thread Starter
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dave
 
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Re: question about BBC heads

wow !.thanks ! gonna go get a pair of 781's this weekend..."johnretired" from the above post is gonna set me up..it's a start. thanks everyone ! GREAT web site ! learned alot in the last year
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post #15 of 17 (permalink) Old Jan 4th, 13, 10:27 PM
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Re: question about BBC heads

Cool! I was going to add , there no salt water in IL, but I had a set of "marine" 049 that just went to scrap, as the water jackets were salt corroded and would continuously corrode.

Between the 049 and clean 781s I finally went with, the 049 did have bigger oil drainbacks and a larger as cast exhaust port than the 781. A carbide bit in a die grinder was the great equalizer, but these are the sort of things you might look at if you have a choice of more than one set of oval castings. And dont be afraid to clean them up a but with a die grinder if need be. If you go cuatiously, you wont ruin anything. I open the oil drains a bunch, blended the bowls ( after seats were cut for bigger valves I already had ), and worked the exhausts carefully based on a blueprint from a pro. Didnt hardly touch the intake runners at all, based on his advice.

They run a darn shade better than the as cast 990s I had on ther, for sure.

Have fun on your parts run!

Gene
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