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If the compression is too low , angle cut the heads! A thicker intake gasket may be needed if you get crazy. The intake surface has to be cut at the same angle, its not the cheapest mod. But it also increases the flow in to the cylinders. Putting the valves at a slightly different angle ,more towards 18°, nothing near it. I have a set of these heads . I'm itching to take them off and give them a little scratch!!!... I want to drop compression, do I Can add boost!! It's about 11:1. I'd like 9.8-10:1, and 10 psi. Minimum!

Where can I buy the valve guide cutting mandrel for LS Chevy heads? Thx

Great videos. Getting ready to work on procomp 210 for sbc. You recommended an economical valve choice in one video, but cant find it. Thanks for the help

I have a LOT of excess valve guide sticking into the exhaust ports of my Profiler 195cc (raised, D-port exhaust ports). They're 11/32" ID, and 0.530" outside diameter valve guides. Where do I get this tool from? What is the tool called? Someone recommended this tool to me, but it is only 0.500" wide and won't cut a 0.530 valve guide: www.beamequipment.com/Valve_Guide_Cutters-Cobalt_Power_Guide_Trimmer.html The CompCams valve guide trimmers are just designed to thin the OD to accomodate smaller diameter valve seals and won't shorten a valve guide on the port side, either... Question: What's the name of the tool you used and where can I get one?

Flow difference between having this guide's modified like this and tapered ones being fitted are not a lot of difference but the stability and valve life would be reduced due to this modification. Especially with the weight of 2 valve heads. Tapered would be my choice in helping flow. Heat sink will also be concern especially for the exhaust valves which could cause detonation due to overheating.

I'd rather spend the money on doing a set of late model cast-iron heads,,,. All aluminum heads are junk in the long run,,,,. !!!

Wouldn't a longer spark plug be better rather than slightly lowering the compression of the engine which also makes for more work and time?

This guy knows his stuff, looks like. GJ buddy

I have cast Silv-O-LItes that have the edge and a rough dish. Will this work and benefit my engine rebuild?

it would be cool if you showed a dimpling technique.

good

Well I stirred a hornets nest up mentioning this and book worms are calling it a lie.

I simply break the sharp edges with 80 grit by hand. Very important and then I simply polish the piston with the finer wire brush on the bench grinder. Effectively the same job and about 10 min a piston.

I love you work man reminds me with my dad working on cars and his secrets

Bolted a pair of those "Blue Print Engine" heads on my motor "OUT OF the BOX" only a 1000 miles on them so far but i will let you know if i have a problem

those stones you use on the aluminum heads, are they dedco? if not what brand?? i can't find the setup you use. any help would be appreciated.

all those mail-order heads were cut in commieland

MORE THAN LIKELY ITS A PRODUCTION VJ DONE WITH A SERTI MACHINE OR OTHER TYPE, AND (SOME ) OF THE PEOPLE THAT RUN THESE MACHINES HAVE NO CLUE OR JUST DONT CARE JUST AS LONG AS THERE GETTING A PAY CHECK, MY PERSONAL PREFERENCE TO THIS DAY IS STILL A STONE GROUND VALVE SEAT JOB IT CAN NOT BE BEET THATS IF ALL YOUR PILOTS AND MANDRILLS ARE UP TO SNUFF, SIOUX STONES AND MANDRILLS IF YOU CAN FIND OR THE EQALE QUALITY, A STONE VALVE SEAT JOB WHEN GRINDING AS SOME OF YOU KNOW WHEN YOU LIFT THE STONE HAS CONTACTED THE SEAT 360 DEG AROUND IF YOUR SEAT IS SQ IN ITS FOUNDATION, A SERTI TYPE IS CUT WITH USALY A DOUBLE FLUTED CUTTER AND IF THE OPERATOR IS ASLEEP AT THE WHEEL WHEN HE LIFTS QWIKLY THERE WILL BE A SPEED BUMP IN THE SEAT, AND IF THIS SPEED BUMP IN THE SEAT IS NOT TAKEN CARE OF BEFORE ASSEMBLE YOU WILL SEE MAJOR DAY LIGHT OR FLUID RUN OUT OF THE PORT LIKE THIS VID IS SHOWING, GREAT VID HEADBYTES PORTING, HAPPY NEW YEAR TO ALL. JEFF D.

That is disaster waiting to happen. I didn't even think of the valve head coming away from the stem! Also the leakage will burn the seats, further reducing compression and also, like you said, cause overheating, low power, and rough running. China makes some things good but not valves. It's like their metals suck on the molecular level.

A "c" hair. I haven't used that term in years! LOL! :-) I guess it is because I haven't done mechanical work in years. Great job.

You are a genius! Thank You for this!

the best gm oval port head.

Do these heads have valve springs installed?

have you played with the protopline bbc heads?

Those ar not 202. mod , bad Guides? Valves -? bent ps.mexico - BAD SHOPPING.

c hair is that on a boat

Aren't Patriot heads cheap Chinese junk?

Dam china valves in it...lol

you got my subscription! thanks I just went threw this and didn't know why until now

3 quarters .066+.066+.066=.198 2.08-1.94= .14 2.02-1.94= .08

does the compression pressure pushing against rhe valve help in the sealing of the valve to seat ? thanx for sharing your expertise.

WOW! Glad I stumbled on this video. I'm going to subscribe for sure. Thanks Headbytes. Keep the good info coming.

great video buddy! Merry Christmas

Great video! Subscribed. I love your straight no bullshit attitude haha

If u scream it makes sense!!!!!!!!!!!!!!!!!!!!!

Junk China parts. Thanks for sharing .

yes you can I bought Edelbrock and they work perfectly for $1400

Hi Mr , I had same problem with a KIA head , ready to fit with lifters and even camshafts , it came in a KIA box ,so I trust the shop and fitted in the engine , this started missing and running uneven , after a while I checked the compression on cylinders and realize that valves did not sit well , took it out and send to cut seats and valves , later was alright , but this causes headache of course , greetings from Ecuador

my engine builder says the only way you know that out of the bow stuff is taking it to your real machiest and rework everything.Cànt build reàl engine without agreàt maçhine shop. you go brother

you had me giggling the entire time! I`v never built any new performance heads, but i have rebuilt some "Q" code 351c heads and did some minor porting to the D0VE 460 heads. i use dye-penetrent the same way you used the carb cleaner! [and its bright red!] I also have a very good 24" machinist square and a good flashlight to check for square. If i can clean them up enough to pass these two test, i`ll run them. If not, they go to my old machinist pal! Of course, i`m just building home-brew hotrods.

I got caught by a big name, "bolt on" horsepower... bolted them on and less or same as standard power, dropped an intake valve into #3 at 90 mph, killed my first small block ford.. Good advice, this happened to me. expensive lesson.

thank you for sharing your expertise.

From years of working on Italian aluminum heads. You grind and test the valve seat with the head bolted to a torque plate always. With the head off the plate the seats may leak. Bolted down they don't. I'm not sure that it is good advice to tell people that a simple carb cleaner test on their workbench means they should send their heads back and be upset. This may not apply so much to a cast iron head. Anyway it's not bad advice to know what is going into your engine and have reputable people doing technical work.

Yeeeeeeeeeeeeeeeeeeeeeee haw!

Back in the days when I built my first heads I used Crane valves.

just get your old head done up. but the shops are getting few and far between now.

buy U.S.A....goods

Walmart and china and Hillary ..........................

damn, I'm gettin ready to buy a used vette n was thinking of building up the motor... something to consider

Thank you sir, I WAS going to buy complete heads but now I will buy bare heads.