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Building a 340 - Various Buildup Questions
#59594
05/19/08 01:19 PM
05/19/08 01:19 PM
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Joined: Jan 2003
Posts: 3,288
Stroudsburg, PA
Erik
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OP
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Joined: Jan 2003
Posts: 3,288
Stroudsburg, PA
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I heard back from my machine shop today and the 340 block I dropped off is ready for the stroker build. I saw a couple of different kits from Mancini for about 2K. My question is should I go internally or externally balanced? This is going in my '68 'cuda w/ had a 4 spd tranny.
Also, any recommendation on heads? I was leaning toward the Edelbrock 340 heads using something like a Comp XE280 cam.
I am building a nice street motor that may see a pass or two down the track so I don't want to go too radical.
Thanks!
Last edited by Erik; 05/20/08 02:12 PM.
1970 Challenger Convertible soon to be T/A convertible
Contrary to the opinions of some, I am not dumber than I look.
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Re: Building a 416 Stroker - Kit question
[Re: 69Cuda340S]
#59596
05/19/08 02:42 PM
05/19/08 02:42 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Dan at performance only racing can get you a real good deal on the same kit plus you will be suporting a moparts member and someone who knows about mopars.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Building a 416 Stroker - Kit question
[Re: Erik]
#59597
05/19/08 03:55 PM
05/19/08 03:55 PM
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Joined: Oct 2004
Posts: 8,165
Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
I heard back from my machine shop today and the 340 block I dropped off is ready for the stroker build. I saw a couple of different kits from Mancini for about 2K. My question is should I go internally or externally balanced? This is going in my '68 'cuda w/ had a 4 spd tranny.
Also, any recommendation on heads? I was leaning toward the Edelbrock 340 heads using something like a Comp XE280 cam.
I am building a nice street motor that may see a pass or two down the track so I don't want to go too radical.
Thanks!
I used the Mancini kit for my 416. It is a high quality kit that uses a Callies crank. I got the one that was already balanced. I also have Eddy heads that were ported by RyanJ at Shady Dell speedshop. It's agreat combo that's hard to beat. I have a small solid street roller and 11.5-1 compression and my motor made about 540 HP with a Perf RPM Airgap/950 Holley and just under 500 with a six pak. -Bob
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Re: Building a 416 Stroker - Kit question
[Re: BobR]
#59598
05/19/08 04:00 PM
05/19/08 04:00 PM
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Joined: Jan 2003
Posts: 4,084
Indiana
W5Duster436
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master
Joined: Jan 2003
Posts: 4,084
Indiana
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Quote:
I used the Mancini kit for my 416. It is a high quality kit that uses a Callies crank. I got the one that was already balanced. I also have Eddy heads that were ported by RyanJ at Shady Dell speedshop. It's agreat combo that's hard to beat. I have a small solid street roller and 11.5-1 compression and my motor made about 540 HP with a Perf RPM Airgap/950 Holley and just under 500 with a six pak. -Bob
Excellent!
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Re: Building a 416 Stroker - Kit question
[Re: Erik]
#59601
05/20/08 01:24 PM
05/20/08 01:24 PM
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Joined: Jan 2003
Posts: 3,288
Stroudsburg, PA
Erik
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OP
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Stroudsburg, PA
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After a discussion w/ my machine shop, this is what we decided to do: Bore the block to 30 over and deck it Use the stock forged 340 crank I already have new Eagle rods new TRW pistons Edelbrock 340 heads Edelbrock Performer RPM Airgap intake Comp Cam 280 mechanical cam/lifters 750-800 cfm carb (undecided on type) 10.5:1 copression ratio He feels I should be able to get 400 - 450 hp out of it. What do you all think? 
1970 Challenger Convertible soon to be T/A convertible
Contrary to the opinions of some, I am not dumber than I look.
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Re: Building a 416 Stroker - Kit question
[Re: BobR]
#59603
05/20/08 02:11 PM
05/20/08 02:11 PM
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Joined: Jan 2003
Posts: 3,288
Stroudsburg, PA
Erik
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Stroudsburg, PA
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400 is still good for me.  He is trying to push me to a mechanical cam. Since the car will only see occasional passes, would a hydraulic setup be better for my needs?
1970 Challenger Convertible soon to be T/A convertible
Contrary to the opinions of some, I am not dumber than I look.
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Re: Building a 416 Stroker - Kit question
[Re: BobR]
#59604
05/20/08 02:15 PM
05/20/08 02:15 PM
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Joined: Jan 2004
Posts: 755
Tempe, AZ
loco340cuda
super stock
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super stock
Joined: Jan 2004
Posts: 755
Tempe, AZ
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Erik, I would go stroker. When I had my 417 built I told the builder I wanted a fun street motor and something that was going to be reliable. Here is what he built me: 340 block (0.035 over) Eagle 4" crank reconditioned stock rods custom forged venolia pistons 9.5:1 compression (very pump friendly) stock 'X' heads with 2.02 valves. (heads were cleaned up and good valve job done) Mopar Performance 484 cam (241int/241ext, .484int/.484ext 108lsa) Edelbrock Airgap intake Holley 770 vacuum Secondary Street Avenger Carb FBO ignition system FBO curved distributor On a chassis dyno the car made 375 peak RWHP and 484 peak RWTQ. At the flywheel the peak numbers are 420HP and 537HP respectively. If you go through my build you can see that it is quite conservative. If I were to swap the heads for some Edelbrocks and put another cam with higher lift I could squeeze a fair amount more HP out of it but for my purposes this engine is good enough for the street and fun to drive as well as reliable. It also has a nice mean idle sound to it. Unless there is a huge cost difference go stroker. 
70 Cuda 340 4 speed - now stroked to 416ci (SOLD)
2017 Mustang Shelby GT350
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Re: Building a 416 Stroker - Kit question
[Re: Erik]
#59605
05/20/08 02:21 PM
05/20/08 02:21 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Sounds like a chevyguy building a mopar  Eagle rods are junk compared to an equivalant SCAT rod. Also for the pistons there are way better choices out there for about the same money. TRW pistons are very heavy 40 year old desighns and that cam is really going to want to turn some rpm. I would say at least 6500-7000 shift points. The SCAT rods are mede of 4340 steel instead of 5340 in the eagle, the scats also use cap screws instead of a nut and bolt like eagles and stock rods. I am not sure about the eagles but I know the SCAT rods use arp bolts and the are a lot less likely to need resizeing. I would get a flat top piston and run the closed chamber eddy heads. That way you can take advantage of quench and not get a bunch of crevice volume. The price is about the same so why not do it better? I do think it will make closer to 450 with good machine work though. Good cam and intake choice. Either way will make similar HP but durability will be way better and it will rev a lot quicker witch makes it feel more powerfull . The differance in the stroker kits and what you are doing is almost none and will make you very very happy!
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Building a 416 Stroker - Kit question
[Re: Erik]
#59608
05/21/08 08:53 AM
05/21/08 08:53 AM
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Joined: Aug 2004
Posts: 3,333
MARYLAND
69Cuda340S
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Posts: 3,333
MARYLAND
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Quote:
So you are saying I should go for the standard 318-360 RPM heads and not the 340 heads?
Yes, get the closed chamber 63cc heads and get a piston that sits at zero deck for a quench combustion chamber.
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Re: Building a 416 Stroker - Kit question
[Re: AdamR]
#59610
05/21/08 09:44 AM
05/21/08 09:44 AM
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Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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I'd go stroker for sure for a street engine, stock stroke engines can make good power on paper and on the dyno (especially in the upper RPM ranges) but in real world street driving low RPM torque is where the fun is, strokers feel like a big blocks off idle, a joy to drive on the street. I've done allot of research on cranks recently, I agree with many of the above posts, go internally balanced, buy the best crank and rods you can afford, and use the lightest pistons you can afford (I like Scat or Callies cranks, Scat, Manley($), or Carillo($$$) rods, and Diamond pistons). Air gap intake with a good carb of choice. Hydraulic cams are also great for street driving, same reason, zero valve adjustments, similar power, especially in the lower RPM ranges. A solid or roller cam will ultimately allow higher RPMs and more power, but on the street you'll rarely need either. I don't see the need for you to buy EB heads if you want to make around 450HP, a good valve job and mild port work on some X or J heads will get you there with the right combo, plus iron heads make more power than aluminum all things being equal. If you want some free HP from iron heads the 308 heads are awesome, you can approach W2 numbers with them with very little work. Aluminum has it's advantages (ease of porting and easier to repair if they get hurt, etc.) but for a budget build iron heads are pretty hard to beat.
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Re: Building a 416 Stroker - Kit question
[Re: 69Cuda340S]
#59613
05/21/08 10:07 AM
05/21/08 10:07 AM
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Joined: Jan 2003
Posts: 3,288
Stroudsburg, PA
Erik
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OP
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Posts: 3,288
Stroudsburg, PA
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Thanks for the replies everyone! I already have a good 340 forged crank, so why spend $$ on a new crank? That is why I am not going the stroker route. For the build, the block and the crank are the only parts I have to start with. I will look into different pistons & rods. As far as heads go, I don't have any right now so that is why I would go the Edelbrock route. If I could find a nice set of X heads, I would consider them also. I don't see too many of them around. I think I'll stick w/ a hydraulic cam. I don't want to have to keep adjusting it. What do you think of the Comp Cam Magnum 280?
1970 Challenger Convertible soon to be T/A convertible
Contrary to the opinions of some, I am not dumber than I look.
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He helped me build the stock 340 I had in my Chally 'vert. and is rally a Mopar guy trying to make a living in a Chevy world...... 
