Nice to find somebody on youtube thats building and showing us before and after all the main stream guys Are legit boring

Again, THIS is hot rodding. You’re seeing results every time. Good stuff.

Try flashing the converter. Don't preload it. Load the chassis so the front comes up and hold it up with the brakes. Let the engine go back to idle while still holding the front up. Hit the gas and release the brake at the same time. If you time it right it will get the converter to flash to a higher RPM at launch and it will have the front of the car already up. You also may want play around with the timing curve. Adjust the initial timing until you find the best 60 ft. Then adjust the max timing until you find the best mph. Then recurve the distributor so you can run the best initial and have the best max timing.

Significant improvement on that one! Love what you're doing...thanks for sharing the journey!

Nice job, keep up the good work, you will get to 13s. Having built numerous 305s in the past 20 years I have some info, actually loads of it running the different GM heada that work well on the 305s small bore. The 081s are decent heads. With the same port work the 416s, 601s and 081s flow nearly identically. The 601s have the smallest chamber and it is twisted like a fuelie head. The 601s are thus closed chamber. The 081s and 416s have a straight chamber and thus are an open chamber design. The 601s have the best combustion chamber design of the 3 but need to be smoothed out a bit to unshroud the valves. The 059/520 305 Vortecs can exceed all 3 in power production and the intake ports flow as well as a modestly ported 416, 081 or 601 without touching them. My 059s flowed 218 @ 0.500 off the junkyard L30, dirty carbon covered valves and all. All 4 of those heads have a similarly flowing exhaust port and some port work pretty much never hurts a SBC exhaust port. The final head I have run on a 305 is the 113 aluminum casting off the ZZ4. I actually like the 113 head the most out of the stock GM heads that are appropriate for a 305. The 113s can flow close 260 cfm without going too crazy on port size and they can easily be milled to ~54cc from 58. The 113s also have a 1.94 valve which helps the flow. I went through some old reciepts I had filed away and Precision Engine Parts in Nevada makes an undercut stem and back cut 1.84" stainless valve for the 305. P3091JF. The valves were worth 12 cfm @ 0.450 lift on the 601s I did some cleanup work and mild porting on. They were the first set of heads I ever put a carbide too. I used the 601 porting templetes that were on TGO years ago. I printed them to scale and translated them to a thin, rigid plastic that I was then able to accurately gauge my process with. The heads flowed 212 cfm with stock valves and 224 cfm with the undercut stem valves. I later found filling the voids under the intake rocker studs with epoxy and smoothing that turbulent airflow out was worth another 6 cfm by itself. My stock exhaust valves were trashed after running 150K miles in a fullsize van under load. I used their 1.50" exhaust valves, P2323J that had the same undercut stems. Another benefit of those valves is the chamber side of the valves is flat as opposed to the dish in the stock valves. The dished area of the stock valves is 2-3cc more chamber volume.

Subscribed: the cleaning of the heads in the backyard did it for me and it's an sbc👍🏿👍🏿👍🏿 Edit: everyone don't have the big machinery to do what you do and you do it right with what you have.........super major props, excellent 👌🏿

good to see you still rocking the 305 build. It's fun doing more with less.

I appreciate how you setup these videos, very organized and to the point. Keep it up!

Very impressed with even the first 0-60s runs of 7.7s with a 305 👍🏻 enjoying this series alot and the 0-60 in now 6.0s .. wow ! Excited to see what the weight savings give it.

Those 081 heads are really good on a 305. LB9 made 220hp stock; 50 more than an L03. I like it that you swapped the heads, but not the cam (yet). It shy what those heads are worth. It'd be interesting to see the improvement you get with a cam swap. Vortec heads would be more desirable than the 081s, but with 64cc combustion chambers vs the 081s 58cc chambers, you have to shave them .45, which means you'll have to shave the intake and it screws with the valve train geometry. The combustion chamber on the 350 Vortecs is also sized for a 4" bore, so there's some shrouding. You might want to look into the 059 Vortec heads. While they don't have the amazing heart-shaped combustion chamber of the 350 vortec heads, they have the same 58cc combustion chamber as a 305 and they have the same size combustion chamber as a 305, so no shrouding. They also flow more air than any other 305 head.

What a big difference a head swap makes!!

.7 is a nice gain! Still more in that 60' too

Seriously keep up with this channel dude. It's gonna go places.

Had a few 305s over the last 30 years, they were reliable but slow af. I respect your hustle!

Damn, more than a whole second 0-60 and 0.75 in the quarter. That's a JUICY improvement my man. I'm gonna repeat one of the other things I said and agree with bovine down below; Try flashing the converter off idle instead of preloading it. :)

I did not expect that much of an improvement

I would’ve recommended watching some quality porting videos prior to the head install. The floors and the pushrod pinch are the last two places you should grind on. Love to see the before and after!

I love these vids. I'm basically building up my 92 camaro the same way. Small gains over a long time as I get spare coin and enjoying the car for what it is. A toy! Keep em coming. The hood and wheels look great on this car!

i LOVE this series. I have a 96 trans am shit box i’ve been building up this is keeping me occupied while i wait for parts

Third gen love. I thoroughly enjoy your science

I would much rather watch this guy build this 305 than any of this new stuff. Awesome content man👍

I enjoy this. Not bad. Using Wallaceracing calculators you went from 203 hp (128.6 hp pr. metric ton 2222 lbs) to 250 hp (157.7 hp.)

Holy cow, that was an awesome improvement. I see high 13´s in your future young sir. Great series BTW.

really liking these videos man. This channel will be big in no time

Awesome job. I didn't think it was going to make that much of a difference. Lol, I guess I'm always skeptical and you always prove me wrong and actually go faster.

A full second wacked off the 0-60 is a huge gain, I love that your building a 305 it gets pretty tiring seeing the same ls swap this 383 stroker that. With the small displacement you have some higher rpm potential which will help a ton with the wide ratios of the 4 speed, I don’t know what cam you have but I’d love to see you throw something in the range of 230 degrees on the intake with a 107 lsa and spin that sucker out too the moon!

Wow amazing results this time around. Nice work

Outstanding work sir! Can't wait for more

Love the videos, it’s so refreshing to see someone modding on a budget and showing before and after results. Keep it up, can’t wait for the next video!

I'm enjoying the heck out of this straight to work format!

Great work! Love seeing before and after.

Great job dude, I this is what hot rodding is all about! It's not instant gratification, but the journey that makes you appreciate your accomplishments!

Had a 85' Z28 and a 86' TA with a stock 305 4 bbl (last year for TA) and remember getting over 30 mpg. Racked up a lot of miles on them and sold them running like new. Bullet proof engine.

I love the step by step progression in these videos

Hi, its been a long time. i had a trans am 1989. it did 15.9 stock. 14.00 with 081 and a 1974 350 under them. Did 12.4 with LT1, and 11.00 with 383.

DAMN! That’s a really good improvement!!! Good before and after test👍 keep it up👍

Videos are great, documenting incremental part swaps and corresponding gains with each! Very cool!! Good luck!!!

I like the format of your videos, one modification at a time with before and after comparison. Are you going to keep going until you hit 10s?

Hell yeah man, well worth the effort with that gain. Had to sub for more videos, really enjoy your content.

Congrats on the 14’s brother!

That improvement is really commendable. Glad to see you still gettin shit done and progress made. I don't know that you'll get to 10's without some giggle gas or a spinny boy, but I'm interested nonetheless to see where this goes.

One of the best channels on KZfaq i love the originality

This was extremely satisfying to watch!

Good job! Love seeing people eff with stuff

love the "phases" of the build...very good

Knocking on 13s now. Congratulations so far. Loving the work you are putting into that car

This is so awesome!! I had a Monte Carlo SS project in the late 90’s and I literally went through the very same process you’re going through except I had a turbo 400 trans with a 10” stall, same 4.10 gears with Hoosiers. I got rid of the 305 for a 327/350 hp motor that a friend was selling and when I finally took it to the track she went mid 13’s. Hope to see more of your project!!

Great videos. It's refreshing to see someone doing something besides junkyard LS swaps and multi-thousand dollar engine builds.

A machinist/engine builder told me to always get the best heads available.

Love it... This is exactly what I've always done since I've got my permit back in 1975. Ported my own heads did my own performance improvements backed up with drag strip results...awesome Can't wait to see what you got planned next

Thanks for the video! Great job with the heads and intake! Did not care for the valve covers, so good call!

I love the unique build and dragy comparisons. Hp numbers would be cool but awesome channel!

Love this! Awesome job. Those evil bay valve covers are a good example of sometimes it pays to spend a little more.

Very nice work.

Well thats a mod that worked, for the street this is really quite a quick car,all you need and basically all most people can handle.

Good work !

Keep making more videos, and before you know it, you'll be on Motor Trend

Gives me hope for my 305

Damn this is such a cool channel. 👍👊

Love the content! Very interesting project ya have going on here. Subscribed!

Great videos. Thanks for taking the time to make them. What mods do you have planned next?

I had a 230hp 5.0 TPI with 5-speed and G92 package that ran 14.7 stock and after SLP exhaust and SLP runners, 24lb LT1 injectors, underdrive pulleys, MSD ignition, Hypertech Cool Fan Switch and chip it managed 13.6 with factory heads and cam.

Nice job

Hell of an improvement, similar weather conditions? Who taught you how to do the cylinder head work? Self taught? Or went to a tech school? I've never been brave enough to grind on cylinder heads.

Nice👍 That's a healthy 305

pretty nice Improvement especially 0 to 60

Good shit man 👍

Wow great content!!!!

Looks like decent port work considering it was freehand, problem isn't the heads it the displacement, that thing needs a 383 swap if you even want to ever see 12's...

Flowing allot better

Thats a HUGE improvement. Please do the roller cam next. Probably get into the 13s.

Nice work, I even approve the music 👍🏼🤘🏼🤘🏼👍🏼

Holy COW! What a difference!

Love the 305 as you see I have a four cylinder that’s all motor that also runs 14

We have the same exact build now put a 650 mechanical secondary on it you will be surprised

Nice. You picked up quite a bit with the head swap. Its been ten years since i had my 305 sbc z28 with 3.72 in the back and had always wanted to do that headswap. People kept telling me i was polishing a horse turd and that i should just buy a better car. I shoulda told em to go kick dust. I think it wouldve been fun and those gains are solid.

Love these informative vids I got a 87 Iroc with a 305 and im on the fence of upgrading it or just getting a 350 I just want to make atleast 300hp

Good job

Damn sweet 305 mods would like to see more mods on your 305

Years ago I swapped out my 305 (081 heads) in my 87 Camaro with a set of 520 heads out of a wrecked 2000 mini van. All I did was add 1.6 roller rockers. The most my LG9 ever dynoed was 217 whp @ 5200 with a 700r4 3.08 gears 2400 stall solid low 14s @102-103 mph that's with 1.96 valves and minor porting .With the newer 520 head scar put down 235 whp @5400 ran the 1/4 mid to high 13s @105-106mph. Everything was run with shorty headers, 625 cfm Carb. Only difference was getting a vortec style intake. I cant remember the cam but it was a wimpy.450-.450 Even with the smaller valves the 520 heads outflow the LG9. Ive since had a set of modified 520 with 1.94/1.55 valves milled down .020 with minor porting 235-240 cfm on build they been sitting in plastic the last 10-12 years as I went to the dark side and Mustangs. My first 4 cars were 89/87 Camaros & 91/92 Firebirds, All were 305s . Ive ran all style gm heads 305/350 gm heads the 520 head flowed the best required no milling, Even the older style heads ported will struggle to match the 059/520 heads even with their smaller valves. I picked up 3-4 mph and .3-.5 seconds by going from mild ported l81 with 1.96 valves to 520 junkyard heads with smaller valves, Mild ported 520 heads with bigger valves probably would of put me close to 250 whp . Awesome video brings back memories of my 20s haha

All that power came from the hood.... Let's be real!!! 🎉🎉🎉

Not much love on the internet for 305s. But always liked them. They were cheap or free.

you make it look easy. how long it took you to do the port matching and the heads swap? Great video.

Damnnnnn mr 305 come alive.....

FYI switch the alternator off under full throttle big gain

i love the before and after 1/4 mile runs. very good way to do it. but i wish the car launched harder, those 60ft times seem high

Great video. People do more for less gain.any reason for no valve stem seals on your exhaust?

I vote that if you end up hurting the 305, you find a 307 chevy to drop in the car. Just to make the folks saying you need a 350 mad lol. While it maintains a similar displacement, you open the bore by .140 of an inch basically. So while a 2.02 valve still won't fit, a 1.94 will flow better because you are unshrouding it some.

I have the same intake manifold 👍

Try a 4 hole combo carb spacer , engine masters showed it maintains the torque on 4 hole and top end of the open

Gt you a new subscriber. Great progress. Loving the content. When swapping cam for one with more rpm range ?

Holy shit it's actually quick now

Edelbrock small bore Chevy heads look interesting 1.91 x 1.50 170cc runners 60cc chambers

Nice vid! 2 things 'tho. #1) Did you get a 3 angle valve job on the heads?? That's critical for flow. It didn't look like you did. If not, I highly recommend that you do. #2) why would you build the motor in the engine bay like that? It's a Million times easier and a fair bit faster to pull the motor, build it on the stand, and then reinstall. Not to mention a Million+ times better for your back. Cool car. 3rd gens rock, I had a blast with mine.

Looks worth it to me.......I beleive if you are wanting max potential Trick Flow makes a set of heads that work with the 305 bore.

I like what your doing, I’d see if you could add some compression, those 305’s were terrible. Maybe some pistons, or deck the heads and maybe go to go a thinner head gasket. You really want to be at 10:1 or better.

These motors get a bad rap and I understand why. But I had a TBI L03 in a Chevy Van and I was more than thrilled with it. It moved that van around without any effort and I never had an issue when I used it to tow anything. Being that is was a van I wasn't worried too much about fuel mileage although I used to get around 400km out of 83 litres. Couldn't tell you if that was good mpg's or not though.

There is definitely some et in carb tuning.sounds like the secondaries are opening late.

Needs about a 3500 stall in that thing, get the flow up to where these heads really start to shine! Drop in a 230-240 @.050 cam as well!

I thought I saw a Shorts video of your car with a bigger cam swap? (480 lift) if so, is the comparison video in the works? Would love to see that. Thanks