Since there is a whole lot of cam talk and not much head talk I'll try to reroute the conversation. I think you should go with a set of Ta Performance stage 1 SE heads or the BBB Edelbrock heads if you want to run sbc rockers. You'll just need to have them cut into 4 sections with 3 cuts right in between each cylinder switch the 2 center sections and weld them back together for the NH configuration.(basically) With a little creative welding the stock exhaust manifolds could be made to fit but headers would work much better with heads that can flow some air now! Intake would need adapters or a custom intake. Doing the above, cam selection would have to be majorly re-evaluated. GL Derek
they can put the 4* built in advance for you. sometimes high lift on the exhaust will hurt flow, as you see on my comp cam it has 14 thousands less lift on the exhaust, that was done for a reason. the 270-280 will fine, but with its slow ramp speed could never keep up with the more updated cams. as I look at the TA-25 cam that has a lot of advertised duration for a rough idle and not very much off idle response as you can tell in video. with out head work a real big cam is a waste.
If you want a set I could probably have them altered in 30 days and would do that job for $2,000(price of heads and shipping not included). Derek
You do realize the nh has raised dome Pistons - right? Not going to work out well with a stg 1 type head for him. This site has been been bordering on the ridiculous lately. I mean just build a 455 if you are going to use 455 heads and Pistons? Cheryl
Nice redirect, was getting tired of reading cam specs. LOL Yes different pistons would be required, duh. Would it be a Nailhead anymore without the backward actuating almost horizontal small valves with level valve covers? The cool thing about doing something like this would be to see if a NH block could actually handle some real RPM with some decent air flow N/A. Back to the cam specs I guess. GL Derek
Getting off subject here, again. I have worked with a guy in N.C. who is looking to "Twin Turbo" a "Nail" & hoping to get 1500HP from it. It's been a few yrs. & I haven't heard a peep from him since. Maybe he gave up. I'll try & see if I can find out his number & give him a call. He does have turbo experience as he's been racing X-Body Mustangs for yrs. & just wanted to do something different.
I've been involved with one that we had taken to 7100RPM's & still making power. From 5900RPM's until 7100RPM's we did not find the "Fall off" point. It was almost level from 5900-7100 with a loss of less than 30HP. So, can it make power above normal???? Yes, with the right mods. But, now your re-engineering what the "Nail" was built for in the 1st. place. A low RPM torque producer. It was MUCH more important to get the Big Load moving. Doesn't take gobs of HP to keep it moving down the highway @ 70MPH with the A/C on. Many forget how HP is made. Density = Air. Air creates HP. HP creates RPM. More thoughts on my part. Tom T.
TA altered aluminum heads would be very different! Stage 2 ported TE heads would probably get him to those numbers with forced induction, maybe even more than that? Custom intake custom turbo exhaust sounds like a fun project with some power potential. He might want to do a block girdle at that level of HP? Not sure, just how much HP/torque can a NH block handle? Derek
Damn, I could perform my nailhead porting on few other heads, if some one wants to give a try. I think without the heads, you'll lose the oddness of Nailhead and fast burning rate (which is the cause of low end torque) as well.
I honestly don't think that ANYONE has even come close to 800HP. We have top fuel dragsters making about 1000HP per cylinder & us "Nailers" have a difficult time trying to get 500 out of 8!!!!
With a BB mopar aftermarket raw forging crank shaft could be machined to a NH crank specs to make huge(for a NH) cubes. The mains could even be offset bored to lower the crank up to a 1/4" with new caps for more deck height and cam clearance for a longer stroke crank than 4.400" I think the max would be for a NH?(.500" more with the crank lowered .250" if the block is wide enough for a 4.900" stroke?) 266/304 International main bearings(Federal Mogul part number 4070M if I recall correctly) would work in a NH with a housing bore size for the 2.75" crank main journal size of the 266/304 engines. With the altered heads why build a 400/430/455 when a cast iron NH block can get more cubes than the other platforms? What's 3 or 5k plus or minus more when you can get 565 CID with a 4.350 bore and a 4.75" stroke? Sorry for the sidetrack, back to reality where most are like me broke as a joke. LOL Derek
Wow, I almost missed this one! Very cool! Was that 7,100 RPM with or without forced induction? Either way that had to be some fancy cam grind in that one! I like re-engineering things. Not such a big load if we're talking '64 - '67 Skylark, 565 CID in a '64 - '67 Skylark would be fun doing maybe high 9s low 10s in the QM with the A/C on! No I'm not talking grocery getter but it still could be if one wanted to use it for that? Derek
Normally aspirated, dual quads, Edelbrocks. Best Et to date 10.8@125MPH. 1.50 60ft. You do the numbers 125MPH/3500pds. If we had proper traction that should have been closer to 10.55-10.65. 4spd.
On my heads and cam combo these were the results on my head porting some time back, its there to refrence, I also used stock valve size and almost the same numbers with a 091 cam http://www.v8buick.com/showthread.php?265921-Ported-425-heads-flow-s&highlight=nailhead+flow+numbers
