059 Vortec or 416 heads? 306SBC - Chevelle Tech
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post #1 of 11 (permalink) Old Oct 16th, 19, 8:43 AM Thread Starter
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059 Vortec or 416 heads? 306SBC

Building a little 306 SBC. One piece rear seal block and 4.3 V8 crankshaft. I have everything except heads, push rods and cam. Thinking Comp 256 HR. I have the 059 305 vortec heads but they haven't been checked yet. I was eyeing 113 aluminum heads but I don't want the hassle of header fitment. Just want something a little different. Will probably end up in my buddies 78 Monty that has a tired 305.
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post #2 of 11 (permalink) Old Oct 16th, 19, 9:05 AM
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Re: 059 Vortec or 416 heads? 306SBC

Interesting combination. Which pistons are you using ? What compression are you shooting for ?

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post #3 of 11 (permalink) Old Oct 16th, 19, 11:56 AM Thread Starter
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Speed pro H631, block is decked to 9.010, GM composition .028 head gaskets. Stock l99 rods are 5.94" should put me .010 in the hole with .038 quench. With 59cc chamber should be around 9.5/9.7:1

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post #4 of 11 (permalink) Old Oct 16th, 19, 2:04 PM
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Re: 059 Vortec or 416 heads? 306SBC

Jeff Swisher is the man to ask on those 305 heads. He is the master getting those heads to run in the 11's
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post #5 of 11 (permalink) Old Oct 17th, 19, 9:03 PM Thread Starter
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Dropped the 059 heads and a set of 1.94 valves off at the machine shop today. Having the pistons pressed onto rods too.

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post #6 of 11 (permalink) Old Oct 17th, 19, 9:28 PM
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Re: 059 Vortec or 416 heads? 306SBC

I was not really sold on the larger valve in the 305 heads..I had to take some meat out of the chambers on the 601 castings that had 1.84 valve to get the RPM I wanted.
Then the 1.94" needed even more taken from the chamber 61.5cc finished when it started at 53.5cc.
That is 601 casting. And that was a 292H cam in a 357" that got shifted at 7400rpm.

I had a set of 305 Vortec heads but never took them apart. Set them in my shed and a guy seen them and traded me a 1967 396" engine with TRW forged pistons and 820 heads for the 305 heads.

I do well with the old 601's and the 1.84-1.50's they rev very well.

I do not even know if the 1.94" will help you out in those Vortec heads or hurt you.

I do not pick up enough flow on a bench to justify the 1.94" valve and this is on a 4" bore deal.

I did run some 1978 305 2 barrel heads on a 357" and kept the stock 1.72 or is it 1.74" intake valve and kept the 1.50 exhaust valves.
Ported them and did a radiused back cut on the valves stuck the 280H magnum flat tappet into it and went 12.51 at 111 in a 3300lb race weight 78 Nova.

Tiny junk heads went into the 12's with bowl porting and opening the pushrod pinch and raised the exhaust port.
Proved to me big valves aren't all that.. yea you can gain some as that one was shifted at 6700 and with good double humps it would go 7200 with 1.94-1.50 valves.
Still not bad.

Get the large valve in that small chamber and not work it over and it will be down on power..Found this out with the 601 heads with my first attempt at the 1.94.
The 292H would nose dive at 7200 and flatline about 7000-7100 RPM.
2 days of tweaking and NO gains..I pulled the heads and seen clean spot in the chambers and I took more out of them and it picked up a lot of power no flat line or nose diving ..still pulling strong at 7500rpm.
Decided to keep it sane and shift at 7400.

Not that you are after max Power or max RPM.
I would keep the smallest chamber size..port the heads.. raise the exhaust port on the vortecs if they are anything like the 350 vortec.
Good valve job on intake and exhaust side.

But like I said earlier I never took the 305 vortecs apart and can't remember the chamber shape and how the stock valve looked in it. Shrouded or not shrouded.

I can't run heads on anything without porting them. I need to grind on something.
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post #7 of 11 (permalink) Old Oct 18th, 19, 6:57 AM Thread Starter
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Thanks Jeff, I plan on cleaning up the SSR and maybe a little bowl blending. I'm not a porter so I won't go crazy. Intake runner has the swirl vane just like a TBI head and the chamber is open not heart shaped like 906/062. I told John to do whatever he would do if it were his. He's a drag racer and a chevy guy so I believe they're in good hands. Not even sure if the 1.94s will even work. I just pulled them out of a set of TBI heads. They have the o ring groove where 059s do not. Didn't think to check OAL either. Should be a fun little project.
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post #8 of 11 (permalink) Old Oct 18th, 19, 8:45 AM
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Re: 059 Vortec or 416 heads? 306SBC

Sounds like they are in good hands..Bowl blending and SSR work is where the majority of power is at, your plans should work well.

I ported a set of swirl vane heads for a friend that wanted to beat up on my Nova with his Monty Carlo.
It was running ported and milled to 54cc 186 casting heads and 270H magnum flat tappet cam [email protected] .050 and .470" lift on a 110 LSA.
I was running flat tops with 5cc reliefs or maybe 5.5cc and .028 piston to head clearance with the steel shim 3.2cc head gasket on it.
My compression was very high and cranking pressure was 245 PSI with an old fat stock starter.

I told him build a 383 and find heads and I will port them..He came over with a bunch of heads in the bed of his truck and the only ones that were not cracked were swirl vane heads.

I left the vane in it and ported them like I do all heads and told him the XE274H looked like a great cam to use.
That cam had not been out but a couple years.
I told him use 3.73 gears and one of his 700R4 transmissions with a 2400 stall and he should beat up on my Nova pretty well.
He put it all together and I ended up moving and we never raced but I heard his car ran excellent and friends told me they thought it would beat my Nova.
That is good that was the plan. I ran 12.55 at the time with 275-60-15 Uniroyal tiger paw tires and 3.70 gears in a 9" rear end in the 1978 Nova. Traction limited. Edelbrock RPM intake was used on both cars and 750 cfm carbs.

I later went solid flat tappet 235-245 @ .050 and a tunnel-ram and 295-65-15 Hoosier dirt track tires Chain link pattern.
Those soft spongy feeling tires that you can fold up and put in your suitcase.

Those things will flat hook to the pavement. Good enough for mid 11's.

You will always want to go quicker and faster.

Your car should be a fun ride when you get it finished. Keep us posted on how it turns out.
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post #9 of 11 (permalink) Old Nov 10th, 19, 2:41 PM Thread Starter
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Vortec heads were cracked, found another set that should be done this week. Deck height is 0. Went with a ramjet cam 196/206 @ 050 .431/.451 109LSA. Pics are not loading.

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post #10 of 11 (permalink) Old Nov 12th, 19, 12:52 AM
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Re: 059 Vortec or 416 heads? 306SBC

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Originally Posted by 6426yy View Post
Vortec heads were cracked, found another set that should be done this week. Deck height is 0. Went with a ramjet cam 196/206 @ 050 .431/.451 109LSA. Pics are not loading.
That cam is the same as the 96-02 Production Vortec Truck cam. I went [email protected] shifting at 4500 with it in my car as a test so it should work pretty good in a 306. I have a 600 Holley VS on it but if I ever test that engine again I will try my tricked out 600 Holley that went 11.75 a few weeks ago. I think I could get it to run high 12's with that ramjet cam. I would also get some 062-906 Vortec heads and angle mill them to the same cc as the 305 heads. In stock form with no porting they will work really well.
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post #11 of 11 (permalink) Old Nov 13th, 19, 12:36 PM Thread Starter
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It's my understanding the stock vortec cam is 191/196 @ .050 .414 .428 111Lsa. Just what I could find googling around. I have a set of 906's at the shop as well getting checked. Not sure I want to invest in angle milling them at this point. The thought has crossed my mind though. I'm trying to be conservative.

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