This is the follow up video to last weeks dyno run where we experienced valve float. I have shimmed the valve springs and we made some clean runs. Also what is to come this year, at Gold’s Garage.
source
This is the follow up video to last weeks dyno run where we experienced valve float. I have shimmed the valve springs and we made some clean runs. Also what is to come this year, at Gold’s Garage.
source
I'm looking forward to this one. Still unviewed but I'll be back.
I can hear ok. are you guys about -40 degrees F.?
I bought an 81 Camaro with the 267 in it. It couldn’t even burn rubber. I have now installed a 350 and look forward to letting it rip in the summer!
Also interested in the results in this video!
Hey there sir, when building 400 small block chevy do you drill the steam holes in after market heads like the speedmaster?
Hi I think some of the problem with the Dart heads is the larger 76 cc combustion chamber. Lower compression ratio results in lower output. What was the runner volume of the Dart head? The previous heads were a factory casting and the runners are pretty small on those. If the Dart's had a larger runner, they were probably better suited to a larger engine or an engine with a higher peak horsepower rpm. Was the camshaft the same one used both times? What was the horsepower peak rpm with the factory castings? Just trying to figure out why the engine didn't perform as expected. Andrew
I'd love to see you when you come to NC, I'm in SC near the border, my build should be done by then
Quick question: Do you have the specifics on the cam(s) in play.? Seat timing, (.006"), duration at .050", LSA and installed ICL.
I noodle around with SBC's as a hobby and have many examples in simulations as well as my own half dozen or so street and or strip engines. Camshafts and cylinder are my primary focus.
Thanks as always. Keep up the good work. (FTR: I tested and tuned regularly at the three southern Ontario tracks back in the day. Beatty and Woods were my go to machine shop back then.)
I think cost comparison will matter. And availability. Its about impossible here in Ca to find any 60-70's decent head castings. Paying a shop to rebuild including parts and porting labor(or not if doing at home porting) and i bet the new castings arent really any more money. Plus a new casting, not rotted or stressed. Just my humble thoughts.
76cc world product heads work on a 400. 350 if its a high rpm high compression.
Nothing like good head!
My problem is enough motor not enough transmission lol!
World products heads are not top choice for 350 maybe too much head for application. The ported small valve heads were really good. I got brodix 180 heads for a similiar 350. Trial and error. Thanks for video.
Yep, have had a telescoping magnet for more years than I can count, and it always comes in useful when you'd least expect it!! Until you've had one, you don't realize how bad you've needed one! lol
That's why I asked about the torque peak from the SR heads on the last vid, Mikes ported heads were better. Whilst they should never have had leaking valves, that amount of leakage on a 44 ci cylinder is nothing. SBC conundrum was always heads back in the day, we're blessed for choice now.
What cam and intake manifold do you have in this combo? Thanks
I am swapping a vortec 7.4 into an old impala that had a 400 small block. I am keeping the tuned port and using the most cam the computer can handle and using a matching 4l80e for the overdrive.
Anyway, the 400 had the fuelie heads and runs pretty darn good, has 80k original miles on it. I was thinking of putting it in an older muscle truck build, how much cam could that engine handle? I onow the fuelie heads are now considered anchors, but theres a lot worse out there on small blocks and this set up is free. Love the show sir!
Good to see some Chrysler content the word Mopar annoys me
Alot of people talk techy jibber jabber. I get in some arguments about my experience and even those SA motorbooks at barnes&noble. About compression. Compression is the last power adder. First and most gains come froms cam and free breathing heads. Then cubic inches. Aside from carb and intake. Has anybody done actual testing. Take the same engine and start with 8.1 compression. Then redo same engine with 12.1 compression. The gain in power from compression is minimal compared to bolting on a large cam and big heads. Prove my point? Has anyone watched or read the article and video of the 454 motor home engine? They took a 35,000 mile low compression motor home engine and dynoed stock made 335hp and 485lbs ft. Then they kept the completely stock bottom and added an trick flo top end kit with Holley. Bang! 567HP and 530+lbs ft. Thats serious power for 87 octane. Cubic inches and breathing make majority of power. Not compression. So out the door with the "you cant have a big cam unless high compression " nonsense. Maybe advise from a great hands on backyard mechanic not bad after all.
thsnks for the education , great content, there is no BS and you're only a few provinces, east . Cheers from Calgary .
6:00 – 3 ways you make power: Compression, Valve timing, Head flow
maybe you could list the heads you tested and let people know it's not money well spent and maybe get a set of Vortec heads and a good aftermarket set and test those or reference some Eric Weingartner videos where he flow benches most all the heads available and show the cream and crap of the crop heads out there he even tests camel backs and other factory heads as well.
‘Psychic income’ I like that term!
Doing the right things and getting acknowledged for it is a great reward.
Thanks for making these videos Alan!
AAAHHHH……..MOPAR coming up!!!!! I"m collecting parts for a LA 408 stroker . i have the block and trick flow heads so far .interested in your comments and 340 build.My engine will have a scat forged rotating assembly ,10.4 comp. with the 60cc chambers,RPM dual plane and small roller cam.
I had those DART S/R torquer heads on a 355 . I had to enlarge the pushrod holes .The heads worked ok in my 81 malibu.
Allan, i could barely hear what you were trying to tell us when you were outside with the water tank. Is the dyno water recirculated? Does the engine coolant have a separate liquid to liquid heat exchanger or something different? As I know you treat builds and dyno sessions as research experiments, did you study the original spring installed and full lift forces with the valve train components and determine that you should or should not have expected valve float at ~5300 rpm? Thank you Cabot
Alan, nice forecast. same age-old problem. Which heads to use. Whose review do you trust? for the average guy, it's a lot of money and a real dilemma. love to watch your channel.
8:07 do you think the cost of traditional SBC heads (or anything SBC for that matter) has become less cost effective than LS stuff? I'm not one of those "LS swap the world" guys. Just truly curious. Their design seems so much more efficient across many stock heads compared to SBC, and they've been around long enough that one would think the SBC has fallen out of favour.
Well ported heads make power!
You mentioned Speedmaster heads and that you've had good luck with them. Do you get them bare or assembled ? Really enjoy the videos.
I love watching your channel Grow !!!!
I am looking forward to the 340.
My Dad built a 350 with world products heads, and it was a turd! I had a set of the old double hump heads, then stepped up to Brodix. Both of those ran good.