So these are level 1 porting and not a all out max effort as was mentioned? Again like has been asked plenty, in a rough estimate how much bolt on horsepower more than iron's? I understand it's not that simple of a answer as the motor has been modded. Compare the question to TA's big block Stage 1 SE heads where they mention a 50hp increase with just a swap.
just remember A+B=C. in other words, the heads will work the BEST with the s/p intake which will wake up your engine.
It would be deeply appreciated if more detailed information could be give as to what level of head porting was done and what size valves were utilized. I assume 2.02 and level 1 porting? (You know what the say when you assume) Maybe even give a little info, air/fuel and timing. Is the 91 octane holding it back from hitting the 500 mark? Still a lot of questions unanswered, but the thanks for the info. I’m not bashing TA in any way just curious.
What about a swap to a completely stock 70 350 10.25 to 1 engine. With the weaker stock cam, stock intake, exhaust etc. would there be a noticeable increase or maby even decrease in hp. I would think the better high lift flow of these AL heads will at least kill lower end torque?? Why is it so hard for them to give a answer about the bolt on difference, they had no issues with mentioning it with the Big Block heads. Not knock TA either as these are great and exciting..
It would be very interesting to pull a junkyard 350 out of a boneyard. Dyno it. Reinstall it with heads. Evaluate.
It calculates to 9.55 compression on a 1970 spec engine with the ta head. I would say all else being stock, bolt on with cleanup porting, the heads could gain 20-30 hp on an otherwise stock 70 engine.the stock cam isn’t going to reach the high flow numbers at .500 lift as the cam barely makes .400 lift. The 212 cam has a higher rpm range and could take advantage of the higher flow at higher lift, along with headers and tuning, I would think reaching 360-375 should be obtainable fairly easily.
The post that TA made on thee ol' BookFace stated an increase of 30HP over stock. I get the consistent desire to have an "out-of-the-box" number, but really, who is going to drop $3K on these heads to just slap them on a bone stock motor? I think the more likely scenario would be exactly what Andy described below: That I think would be the most likely for someone to do. Take a stock engine with a good bottom end, 212 cam, SP3, Heads w/ a level 1, stock rockers, 800CFM Q-jet (or 850DP). Otherwise that $3K would be better spent on gears, posi, & a converter.
They certainly wont hurt performance,..some of you guys are making way to many excuses,..buy them and make them into what you need,..if you want to maximize your low end and midrange then keep the cross section in check and concentrate with the lower lift improvements,..if you want yo put a NA 350 in the 11s or 10s then Hog them out,..cam and gear the snot out of it and do work,..its not hard. Sounds like alot of complaining wanting TA to do the RandD for a dozen different combos...that's where the buyer comes in. Just some tough love nothing personal
You guys need to take a look at that dyno sheet again. That is one awesome street engine. Look at the torque curve. Pretty flat I'd say. Torque doesn't drop off until well over 6000 RPM. The 1970 SP 350 was spec out at 10.25:1 SCR, we all know it wasn't. It made 315 HP/410TQ. Just like the big block, probably over rated. Have a look at the ported iron headed 350 Jim Weise built, http://www.v8buick.com/index.php?th...up-info-and-dyno-results.153248/#post-1194307 348 HP and kind of peaky 400 ft. Lbs. TA's 350 made 481 HP and 433 TQ over a much wider RPM range. What do you guys expect? You think these heads will put you in Big Block territory power wise? They pretty much did HP wise, with 100 less cubic inches. I think these heads have lots of potential. Want more power? Put a bigger cam in and spin it higher. I'd like to see what a split duration cam would make in this same engine.
Agree with Hugger. TA provides the canvas, you paint the Mona Lisa. That being said I would like to see a middle of the road build then swap on the SP, then swap on the heads. Just to see what can be expected real world. By middle of the road I mean average guy build. No turbos, Vortec or other forced induction. No roller cam either. Go 9.5:1, hydraulic cam around .525 lift,110 or 112 LS, Stage 1 or stock intake, headers.
I’m definitely getting a pair next year, my excitement about them is over, so I can make a better decision about them as far as valve size I want ( 2.02 sound nice) and porting work. I wanna tune what I have so far with my restalled JW convertor. I’m hoping for a slightly better e.t. But ima thinking my mph MAY come from leaning out the secondaries a bit, I’ll have to pay attention to my A/F gauge, put a camera on it or something like was suggested. I still wanna upshift 1-2 @ 7000 rpm, it seems to like it.
I still wanna upshift 1-2 @ 7000 rpm, it seems to like it. put some serious gear in that tank and it will. you will be smiling like the old chesire cat.
That would be a fun motor in a lightweight 7o-72 GS, with a 200-4R and a set of 4.10 gears out back. Good job Michael, you laid it out well. JW
The TQ curve is really good has my engine beat by a mile on that, 370 peak @ 4900. Like JW said 200-4R with a 410 gear or go big with a 430 and rip the drawers off everyone.
1st in bold, get the heads so you can use the sbc roller rockers and get a set of these; https://www.ebay.com/itm/Roller-Roc...3-8-Aluminum-Rockers-305-350-400/222851192768 Or with 7/16" studs; https://www.ebay.com/itm/Roller-Roc...-16-Aluminum-Rockers-305-350-400/391986683687 With 1.8:1 rockers, a cam with .430 lift would turn into .430/1.55 = .2774 lobe lift times 1.8 = .499" lift. The new heads unported with the extra lift with the 1.8:1 rockers gets closer to the max flow, IIRC was around .500" lift or is .600"? Either way .499" should help get the breathing to add around 40/40 or more HP and ft lbs? What is the lift for a factory cam anyway? If it is .450" then with the 1.8:1 rockers would be .522" lift! 2nd in the bold, unported TA kept the velocity up so with the extra flow will come more low end torque even though the torque will peak higher, the start off point of the torque curve will start higher as well.
So I went back in time and found post 862 of this thread with the posted unported flow numbers @ .500" lift the flow is only down 8 CFM from the max; http://www.v8buick.com/index.php?threads/buick-350-alum-heads-update.308768/page-44
I mean... I have a '70 SP in my Regal. Bone stock (stock bore too) except for a crower level 3, 800cfm qjet, TA HEI... If anyone wants to donate a pair of heads... and headers.
