Re: 512 build thoughts
[Re: ShawnS]
#2946671
07/24/21 03:43 PM
07/24/21 03:43 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Well there's plenty people on here with experience of building similar combo's like this for street and will offer better suggestions than me but here are my opinions at least>
He's right on the 240 heads for a street car, generally you want to see max hp out of the smallest port possible
Wrong about the edel carb, holleys don't leak, don't know where he got that from, I ran nothing but holleys on my street/strip car and race only car with zero leaks/issues for 10yrs I was in this madness. I would run an 850 or 950DP on that.
A solid ft cam close to .600" (326cfm@.600 on the 240's) with dur@.050 in the 240>250's on 108cl with around 10:1+cr would work well although no expert on this.
Performer rpm would work ok but I would be inclined to lose some torque with a stick car as it could be too lethal on the street with a 512 although it sounds as if thats what you want. A TF intake or Victor would be my choice.
A true 600hp so 630+ on a dyno with addition of ancillaries in a 3800lb car with your rear chassis set up hooking good could run as good as 10.7's@124mph@5600rpm trap speed with 28" bias slicks/3.73's, not the most important to you but worth noting perhaps.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: 512 build thoughts
[Re: AndyF]
#2946685
07/24/21 04:20 PM
07/24/21 04:20 PM
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Joined: Jul 2021
Posts: 19 Wilmington, North Carolina USA
ShawnS
OP
member
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OP
member
Joined: Jul 2021
Posts: 19
Wilmington, North Carolina USA
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I was hoping you’d respond I’ve followed many of your responses on these heads in particular. I’ll be talking to the builder Monday again. I don’t believe he’s ever used the trick flow heads he normally uses edelbrock or similar for street builds. From talking to him he didn’t seem to know much about the 240 or 270 but felt that a super victor would be far to much for a street car. As for the carb. He runs holleys on his race cars custom ones. However doesn’t like them on the street. As for the sniper. Maybe in the future but at this time I want to steer clear of computers. In terms of the cam you were referring to I assume that’s pretty mild sounding in a big stroker? Any thoughts on carb size or type 4150? 4500? I’d likely have one built but was ASO looking at the ultra HP. Probably just better in the long run to have one built though. Also have a small hood scoop so a single plane will clear.
Last edited by ShawnS; 07/24/21 04:29 PM.
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Re: 512 build thoughts
[Re: ShawnS]
#2946689
07/24/21 04:27 PM
07/24/21 04:27 PM
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Joined: Aug 2011
Posts: 2,856 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,856
Pattison Texas
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Indy has new owners & are great people, 270 heads, indy single plane intake & a Thumper carb, [ Holley ish ]
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: 512 build thoughts
[Re: ShawnS]
#2946696
07/24/21 05:21 PM
07/24/21 05:21 PM
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Joined: Jan 2003
Posts: 16,925 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,925
NC
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As for the sniper. Maybe in the future but at this time I want to steer clear of computers. I would encourage you to give more thought to putting the Sniper system on right from the start. Once you spend $1000-$1500 for a carb, fuel pump, regulator etc, it is hard to justify changing. Everybody's idea of "good street manners" is different. That Sniper will really make it nice to drive everyday. A regular Holley carb or Proform, etc can get the job done. It will just act like a well tuned old school engine/car. If you do decide to go Holley style carb, I don't like the 850 cfm venturi ratio. Those 950's just work better all around, IMO. Another thought, for a real nice street driver, put a long collector extension (18" min); before the rest of the exhaust system. For 1500-3000 rpm smooth torque. Anyway, I think with decent heads and 512 CID it will be a tire frying machine on the street. Are the Trick Flow heads actually available to buy right now? I will stay out of the cam discussion. I would end up putting much more duration than most people.... LOL
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Re: 512 build thoughts
[Re: ShawnS]
#2946699
07/24/21 05:26 PM
07/24/21 05:26 PM
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Joined: Jan 2003
Posts: 31,022 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,022
Oregon
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I was hoping you’d respond I’ve followed many of your responses on these heads in particular. I’ll be talking to the builder Monday again. I don’t believe he’s ever used the trick flow heads he normally uses edelbrock or similar for street builds. From talking to him he didn’t seem to know much about the 240 or 270 but felt that a super victor would be far to much for a street car. As for the carb. He runs holleys on his race cars custom ones. However doesn’t like them on the street. As for the sniper. Maybe in the future but at this time I want to steer clear of computers. In terms of the cam you were referring to I assume that’s pretty mild sounding in a big stroker? Any thoughts on carb size or type 4150? 4500? I’d likely have one built but was ASO looking at the ultra HP. Probably just better in the long run to have one built though. Also have a small hood scoop so a single plane will clear. You should just copy the engine that I built for my Coronet. It is an RB block with a 4.25 stroke with 7.10 rods and TF 240 heads. I used a 239/245 hyd roller from Porter Racing Heads and a Trick Flow intake manifold. That engine made 613 hp at 5900 rpm and 630 ft-lbs at 4800 rpm so it would do exactly what you want. It also idles nice at 850 rpm and is easy to drive around down. You don't need a big cam to make 600 hp with the TF heads so don't get talked into putting a race cam in there. I had to go thru 5 or 6 cams when I first switched to the TF heads before I figured out what worked with them. If I was going to run a carb in my Coronet I'd use a 800 cfm Edelbrock. The Edelbrock carbs have a much better idle circuit than Holley carbs so they work better for typical street driving. You'll give up some top end power to a Holley but you might not ever notice it. You'll notice the idle improvement every time you drive it. I think you could make 600 hp with the 800 Edelbrock but it would need to be dialed in by someone who knows those carbs. The Edelbrock 800 isn't really designed for 600 hp so you have tweak them a bit. The other option would be to use a CH28 dual carb, dual plane intake with a pair of Edelbrock 500 cfm carbs. Buy the ones that are calibrated for dual carb use and they'll work great right out of the box. The CH28 with dual 500 cfm carbs would be a monster on a 512 with TF heads. It would also be a very nice driver with great torque down low. Run that idea by your engine builder and see what he says. I used to have a 505 with a CH28 and dual 500 carbs but that engine had Edelbrock heads on it. It would've made more power with TF heads.
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Re: 512 build thoughts
[Re: CSK]
#2946714
07/24/21 06:00 PM
07/24/21 06:00 PM
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Joined: Jan 2003
Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,996
Frostbitefalls MN (Rocky&Bullw...
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Why not learn what you need to now about fuel injection? No better time than BEFORE you drop $$$$ on a build. If you have e85 in your area you can build a lot of power with e85 and high compression combined with port injection. It will also allow less cam if you want. Look at the ports on the new Hemis. Big. And long tube tuning. Very mild cams. No experience here trying this, but I wonder what trick 270 heads, Indy dual plane intake with port injection and a mild performance grind of about 232/232/108 with a high ratio rocker would perform?
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 512 build thoughts
[Re: ShawnS]
#2946723
07/24/21 06:10 PM
07/24/21 06:10 PM
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Joined: Jan 2003
Posts: 31,022 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,022
Oregon
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I’m sold on the dual quad set up I’ve always loved the look but you’re killing me with the cam and dashing all my hopes and dreams of having a cam that scares people 😂. Thank you for all the help. You can put a big cam in there if you want but it will kill power down low and it won't make more power up top since your exhaust system will kill the top end power anyway. Been there and done that a few times. The 505 in the picture with the CH-28 manifold made 610 hp with Edelbrock heads. It used a 242/248 @ 050 hyd roller (Comp 292 grind). With TF heads it would make more power, maybe 620 or 625. Peak power would be around 5900 or 6000 rpm so no need to twist it much harder than that. Talk to your engine builder about a hyd flat tappet or hyd roller cam. If peak power is going to be at 6000 rpm then you don't really need a solid flat tappet cam since a hyd cam should work just fine up past 6000 rpm. You might think you need a big cam and a big carb to make 600 hp but that isn't the case with TF heads. It might have been true with 906 heads but not with the TF heads. Just follow the advice and you'll have a really nice 600/600 engine that runs smooth and makes wall to wall torque.
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