Just Talked To Dart.....
Porting and Valve size are really the only things that change in relation to the bore size. Both castings use the same seats and you should be able to put enough valve in there to work with either the 4.0" or 4.125" bore.
Bret
Bret
Originally Posted by SStrokerAce
Porting and Valve size are really the only things that change in relation to the bore size. Both castings use the same seats and you should be able to put enough valve in there to work with either the 4.0" or 4.125" bore.
Bret
Bret
On The Tree
Joined: Sep 2005
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From: Suburbs of Detroit
Bore size I agree with what Bret said, the bigger bores will work with the heads, typically the larger bore engines like the larger runners and bigger bores.
Titanium retainers: We buy these right from Trick, which makes all the titanium bellhousings for Top Fuel cars, they also supply all of the companies, like Comp, Crane and several others with their retainers. They to our knowledge are the only US maker of Titanium retainers. Cost is material, and it will get worse I am sure, but nonetheless, beehive springs, bead lock keapers and the crazy factory seal with shim and locator built in are all more expensive than typical Chevy parts. This trend wont change until the demand is so high that parts are more mass produced than they normally are. There are 90 Million conventional chevy motors out there that GM has made, that doesnt count Vortec, LS, and LT series engines. SO you can imagine what the products ratio is for parts for conventional Chevy engines to LS series engines.
The initial design of the new valve weighed in at 97grams, and we are not done with it yet, so it should be pretty close to the stock valve.
Will have more information as its available.
Titanium retainers: We buy these right from Trick, which makes all the titanium bellhousings for Top Fuel cars, they also supply all of the companies, like Comp, Crane and several others with their retainers. They to our knowledge are the only US maker of Titanium retainers. Cost is material, and it will get worse I am sure, but nonetheless, beehive springs, bead lock keapers and the crazy factory seal with shim and locator built in are all more expensive than typical Chevy parts. This trend wont change until the demand is so high that parts are more mass produced than they normally are. There are 90 Million conventional chevy motors out there that GM has made, that doesnt count Vortec, LS, and LT series engines. SO you can imagine what the products ratio is for parts for conventional Chevy engines to LS series engines.
The initial design of the new valve weighed in at 97grams, and we are not done with it yet, so it should be pretty close to the stock valve.
Will have more information as its available.
Is it just me or is the casting a bit thin on the intake runner shown in the last pic? I can't make out if it's a water jacket or an intake bolt hole, but it looks like something is going to encroach on the intake tract. Either way I'm sure Dart will take care of it for their final castings, but I'm just a bit curious. Thanks for stepping up and making an affordable aftermarket casting for us GenIII guys.
Originally Posted by SStrokerAce
These are big so I will warn ya in advance. It would be best to have the computer set to size these to your screen!
http://www.mofbody.com/Floyd/DSCN1150.JPG
http://www.mofbody.com/Floyd/DSCN1151.JPG
http://www.mofbody.com/Floyd/DSCN1152.JPG
http://www.mofbody.com/Floyd/DSCN1153.JPG
http://www.mofbody.com/Floyd/DSCN1154.JPG
http://www.mofbody.com/Floyd/DSCN1155.JPG
BTW Dart is switching to a 8mm valve setup now so you guys dont have to worry about parts interchangeability. Thats even cooler! From what I have heard the head has been revised two times already by a head department that does Pro Stock work all day. I'm excited to see what they do on a motor!
Bret
http://www.mofbody.com/Floyd/DSCN1150.JPG
http://www.mofbody.com/Floyd/DSCN1151.JPG
http://www.mofbody.com/Floyd/DSCN1152.JPG
http://www.mofbody.com/Floyd/DSCN1153.JPG
http://www.mofbody.com/Floyd/DSCN1154.JPG
http://www.mofbody.com/Floyd/DSCN1155.JPG
BTW Dart is switching to a 8mm valve setup now so you guys dont have to worry about parts interchangeability. Thats even cooler! From what I have heard the head has been revised two times already by a head department that does Pro Stock work all day. I'm excited to see what they do on a motor!
Bret
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On The Tree
Joined: Sep 2005
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From: Detroit - suburbs
We're striving for ship dates of late October for bare heads, but after our latest revisions the reality is looking like assemblies will probably be shipping around the middle of November (hopefully).
TECH Apprentice
iTrader: (3)
Joined: Nov 2005
Posts: 387
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From: Tinker till it blows, then back it off a notch, maybe!!
Can anyone recommend which Dart head, cam and CR to use for this application?
01 Vette 6 speed LS1 Stock bore and stroke, Forged rods and pistons. Magnacharger at 8 to 10 PSI w. alky. Kooks 1 3/4" LT's w/ hiflow cats, etc.
Motor is coming out this weekend. So pistons and rods haven't been ordered.
Thinking about JE's and Scat rods.
Old hp was 435 rwhp with just Maggie and alky @ 7 PSI (no headers)
A slightly rough idle is desired as long as coupled with more power to around 7k.
BTW What power can a setup like this make? (Looking for well over 500 rwhp and oodles of torque)
01 Vette 6 speed LS1 Stock bore and stroke, Forged rods and pistons. Magnacharger at 8 to 10 PSI w. alky. Kooks 1 3/4" LT's w/ hiflow cats, etc.
Motor is coming out this weekend. So pistons and rods haven't been ordered.
Thinking about JE's and Scat rods.
Old hp was 435 rwhp with just Maggie and alky @ 7 PSI (no headers)
A slightly rough idle is desired as long as coupled with more power to around 7k.
BTW What power can a setup like this make? (Looking for well over 500 rwhp and oodles of torque)
Originally Posted by SStrokerAce
Porting and Valve size are really the only things that change in relation to the bore size. Both castings use the same seats and you should be able to put enough valve in there to work with either the 4.0" or 4.125" bore.
Bret
Bret
Brandon
Originally Posted by rjw
Can anyone recommend which Dart head, cam and CR to use for this application?
01 Vette 6 speed LS1 Stock bore and stroke, Forged rods and pistons. Magnacharger at 8 to 10 PSI w. alky. Kooks 1 3/4" LT's w/ hiflow cats, etc.
Motor is coming out this weekend. So pistons and rods haven't been ordered.
Thinking about JE's and Scat rods.
Old hp was 435 rwhp with just Maggie and alky @ 7 PSI (no headers)
A slightly rough idle is desired as long as coupled with more power to around 7k.
BTW What power can a setup like this make? (Looking for well over 500 rwhp and oodles of torque)
01 Vette 6 speed LS1 Stock bore and stroke, Forged rods and pistons. Magnacharger at 8 to 10 PSI w. alky. Kooks 1 3/4" LT's w/ hiflow cats, etc.
Motor is coming out this weekend. So pistons and rods haven't been ordered.
Thinking about JE's and Scat rods.
Old hp was 435 rwhp with just Maggie and alky @ 7 PSI (no headers)
A slightly rough idle is desired as long as coupled with more power to around 7k.
BTW What power can a setup like this make? (Looking for well over 500 rwhp and oodles of torque)
Than setup you listed should make plenty of TQ, but you're not going much over 500 rwhp with that Maggie... another reason I say to leave the stock short block.
Use the 225 Darts with this combo, you want the larger heads with your combo and goals.
TECH Apprentice
iTrader: (3)
Joined: Nov 2005
Posts: 387
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From: Tinker till it blows, then back it off a notch, maybe!!
Originally Posted by Wet 1
I'm not sure why you're changing the pistons and rods given that you're not planning on leaning on it very hard. Your stock short block should handle 10 psi without a problem. If you must change the pistons Diamond and Malhe make nice FI pistons for the money. Scat rods are nice as well.
Than setup you listed should make plenty of TQ, but you're not going much over 500 rwhp with that Maggie... another reason I say to leave the stock short block.
Use the 225 Darts with this combo, you want the larger heads with your combo and goals.
Than setup you listed should make plenty of TQ, but you're not going much over 500 rwhp with that Maggie... another reason I say to leave the stock short block.
Use the 225 Darts with this combo, you want the larger heads with your combo and goals.
The flow numbers on the 225 head aren't that much higher under .550 lift. Or are they?