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Hi i'm working on my old D17A2 civic i check the end gap with STD new rings and the gap is off, can i buy oversize rings and grind the to spec end gap? spec is max 0.30 mm how much more of that can i go

98% of flat tappet cams fail due to people not using break in oil. If you bought the break in additive to put in the oil due yourself a favor and just take it back and get the lucas brand sae 30 oil. It saves a big rebuild cost !

Any flow numbers on the heads?

Static compression ratio is IRRELEVANT to whether or not pump gas can be used. 14.0:1 can be ran on pump gas with the right camshaft.

467.2 hp and tons of .....TORQUE!!!!!!!

Springs?

Pat you the man .. I need some circle rack cutter performance heads 😉👍🏻

You were already buying an aftermarket crankshaft, would it have been much more expensive to upgrade to a stroker crankshaft?

Wow. Great build, great comparison and great breakdowns! Oh, and great power! Thanks

You think those turbo mufflers are hurting your Dyno numbers ? 🤔

Hi what's the part number on the exhaust valve and vendor . Thank you

cant wait for the 383 build

Great comparison! I know a 383 version is on deck but I'm curious about your version of a 406 like the "Impersonator II" engine build Motortrend did many years ago. 525 lb ft of torque with vortec heads, lower compression, and a .480 cam. 👍

2 yrs later prices have only gone up more 👎🏼

I've got a bottom end to do a 383 hit me up. Been wanting to redo.

Thanks for testing, its refreshing seeing these good dyno results.

Looking forward to the Dingleball Stroker! My 383 project will have .525 lift with my 225/231-ish roller cam. AFR 195 Enforcer heads planned. Would you go with 1.6 rockers to bump up the lift a bit? I haven't ordered any top end stuff yet. Just building the rotating set.

I prefer the 1.0 engine because of the affordable flat tappet. However PROPER break in is a must...and take EVERY precaution to ease the spring pressure during breakin

Now, imagine this combo with just a little 100 shot of spray. You're knocking on the door of 600 hp!!!

Do you sell vortex heads w port jobs done to them?

Thx... i built excat same combo except a 245/251 @.050 cam (speedway motors) and h618cp30 dome pistons with same ebay heads. I wondered if i was churning out 400h.p. thx for telling optimum ignition timing. I keep mine at 32-30 to help avoid detonation. Also running a aluminum flywheel with a T5 and 3.70 gears. It hauls ass In a 3200lb 1939 chevy truck

Any plans for a 327 build?

Love it

Were both cams on a 108 lsa?

PAT! What would the compression ratio had been if you didnt have the heads milled??

comparing some as cast aluminum heads to your ported vortec on these engines would be nice. buying vortec heads and having them ported and set up for these engines is more money than some of these aftermarket heads.

Did you use the thick old style 5/64 thick piston rings? I would love to see a test between them and a 1/16 or 1.5mm set and also a 1mm set. The only tests I’ve found haven’t included the 5/64 rings. The OEM’s went to 1/16 or 1.5mm in the’80s and now a lot of engines use 1mm-1.2mm sets. I would imagine the difference between the thinnest and the thickest rings would be 10 HP I would imagine.

The Summit cams are a lot cheaper than the name brand ones. Last time I bought a Summit cam KIT (with lifters) it cost $79! Yeah it’s been a while. The Summit flat tappet cams are roughly half the price of a Comp.

Also, great advice on finding true TDC and making sure the balancer and pointer are correct.

I’ve seen a lot of good engine builds fall flat because the owners just set initial timing and figured everything else would work itself out. I had an HEI that the advance mechanism was seized on so I replaced it with a new MSD unit with the light spring combo. It felt like I had added another 100 cubic inches!

You have proven again that you can run a noticeably smaller roller cam and make similar power to a larger cam. The Vortec heads always amaze me in that they a lot of times make more power than a better flowing head. That’s one nice thing about small 170cc runners flowing 230 ish com.

Dude I love the “hot for teacher idle” reference! When the 1984 album came out when I was 13 the first time I heard that song I thought it sounded just like a large camshaft idling.

Soaking lifters is no good. A pumped up lifter holds valves open while cranking the engine causing it not to start instantly. You need instant starts when breaking in a new cam. A dry lifter will pump up when you prime the engine.

90% of the time when flat tappet cams go bad on a rebuilt engine it's because people don't hone the lifter bores. Lifter bores usually get scored during tear down, which keep the new lifters from rotating. If the lifters don't rotate while the engine is running, they WILL get destroyed along with the cam lobe.

Perfect timing I've got a 357 I'm working on have a couple of flat tappets but was thinking the same thing a hydraulic roller will give me more lift while keeping duration at a good streetable range, nice video.😎❤️🔥💯👍

I’m waiting on the entire list for the 2.0!!!

Thank you for making videos on these vortec heads. A lot of of us are tired of LS videos. Let’s add 100 shot of nitrous on a video👍

I got it bad, got it bad, got it bad, I'm hot for teacher.

Awesome video , very informative and very well presented. Nice work my guy !! 🍻

I would love to see a 383 version of this motor with the re-worked cheap aluminum heads from DNA or whatever.

Whats the part number on the exhaust valves?

Nice job, fun little motors, you can run the tar out of them on the weekend and still drive them to work Monday morning.

They are both Great combos mate. @ 3:50 what is the name of the black colored device on the top of the carby whilst the engine is running on the dyno? Is it some sort of flow smoothing device for the carby? Thanks 👍🇦🇺

Aluminum head needs 1-1\2 more compression to equal an iron head. Around 11 to 11-1/2 to 1. Aluminum dissipates heat faster, and it needs the higher compression to make up for the lack of heat in the combustion chamber for a better burn.

Well done, this is awesome.

Can you make a detailed video on porting heads. Or have you already made one

Great job thanks for putting the time into this......Brett

Can you supply me the uncorrected HP and the town the dyno sits in? Thanks

Thanks for another great dyno test, did you by chance test with and without the K&N stub stack? I have read of cars going slower in the 1/4 mile with one, but maybe it works great on the dyno?

Would love to see a budget comparison on both.