New LT1 to LT4 conversion package
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
Originally Posted by BAM92
Better yet, get your job back and meet me by the back door. 
No thanks. Job was cool, but the boss was a jerk. The machine shop is not in-house at SD, but a local shop in town. Sunset racecraft, sunsetracecraft.com
Burning Brakes
Joined: Nov 2002
Posts: 1,239
Likes: 1
From: Las Vegas NV
Originally Posted by 94brick
Take a look at this package. LT1 to LT4 conversion with CNC aluminium heads. For those that know, is this a good deal?
http://www.sdpc2000.com/catalog/3473...m-and-CNC-Head
http://www.sdpc2000.com/catalog/3473...m-and-CNC-Head
Don't waste your money on that kit, notice there are no flow #s for the heads. I guarantee you the new AFR 180 CNC head will out perform CNC LT4 heads.
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
Originally Posted by bogus
I have been considering their LT4 top end kit, anyway... 50 state legal is very attractive to me!
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
Originally Posted by crheinish
Don't waste your money on that kit, notice there are no flow #s for the heads. I guarantee you the new AFR 180 CNC head will out perform CNC LT4 heads.
The 180cc AFR heads are 260CFM intake and 194CFM exhaust @.600" lift.
Considering those are stock numbers for the LT4 I would bet that their CNC version flows more than the AFR 180's...and you don't have to wait 6-8 months to get them.
Burning Brakes
Joined: Nov 2002
Posts: 1,239
Likes: 1
From: Las Vegas NV
Originally Posted by Zix
Just barely, the stock LT4 heads flow 250CFM intake@.550" lift and 185CFM exhaust@.600" lift.
The 180cc AFR heads are 260CFM intake and 194CFM exhaust @.600" lift.
Considering those are stock numbers for the LT4 I would bet that their CNC version flows more than the AFR 180's...and you don't have to wait 6-8 months to get them.
The 180cc AFR heads are 260CFM intake and 194CFM exhaust @.600" lift.
Considering those are stock numbers for the LT4 I would bet that their CNC version flows more than the AFR 180's...and you don't have to wait 6-8 months to get them.
http://www.airflowresearch.com/pages/180sbc_lt1.htm
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Brett Foote
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by crheinish
Don't waste your money on that kit, notice there are no flow #s for the heads. I guarantee you the new AFR 180 CNC head will out perform CNC LT4 heads.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by steve9899
The LT4 heads are not 50-state legal for an LT1. They are "offroad use only."
again, who will know? I powercoated my intake red. BFD.
Le Mans Master
Joined: Jul 1999
Posts: 8,683
Likes: 6
From: Phoenix AZ
Originally Posted by crheinish
You must have misread the #s. Here is a link, scroll down to competition port. Mid lift #s are every thing.
http://www.airflowresearch.com/pages/180sbc_lt1.htm
http://www.airflowresearch.com/pages/180sbc_lt1.htm
Intake:
.200 - 147 - AFR - 144
.300 - 197 - AFR - 206
.400 - 230 - AFR - 245
.500 - 250 - AFR - 260
.600 - 243 - AFR - 268
Exhaust:
.200 - 114 - AFR - 102
.300 - 141 - AFR - 152
.400 - 167 - AFR - 190
.500 - 180 - AFR - 204
.600 - 185 - AFR - 211
Now if you got their CNC LT4 heads that would be a different story, but these heads just aren;t much better than STOCK LT4 castings...and the ones in the SD package are CNC ported as well so their numbers will be better that what's listed above
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
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St. Jude Donor '03-'04-'05-'06-'07
You can get the same kit from GM Parts Direct for $2200 including the shipping.
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
I have AFR heads and the qc is not that good, grind marks all over the place and the wait sucks.
The LT4 heads are machined at the proper angle and AFR can be anything but what you want these day's.
I think AFR sends their heads to the local high school these day's to save money.
For the $2500.00 for AFR heads GM is a better deal.
The LT4 heads are machined at the proper angle and AFR can be anything but what you want these day's.
I think AFR sends their heads to the local high school these day's to save money.
For the $2500.00 for AFR heads GM is a better deal.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by REDC4CORVETTE
I have AFR heads and the qc is not that good, grind marks all over the place and the wait sucks.
The LT4 heads are machined at the proper angle and AFR can be anything but what you want these day's.
I think AFR sends their heads to the local high school these day's to save money.
For the $2500.00 for AFR heads GM is a better deal.
The LT4 heads are machined at the proper angle and AFR can be anything but what you want these day's.
I think AFR sends their heads to the local high school these day's to save money.
For the $2500.00 for AFR heads GM is a better deal.
The wait does suck, I have to admit that. I just received the first of two sets of LT4 210s that are 100% CNC'd. Out of the box I haven't seen any problems with them. I am going to disassemble them and see if there are any internal problems such as loose guides and seat problems. The one thing that PO'd me was that I had ordered 70cc chambers and I got 76cc chambers. Not a big deal but it could have been if it was turned around. They swore I ordered 76's but I know better. Now I have to have .036" shaved off the heads to get my 70cc chambers. I would have preferred that they did that work but thats where I am now. It would cost me double to send them back to them to have them do it. But at least I caught the other set of heads before they shipped them to have the chambers set at 70cc.
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
Originally Posted by steve9899
The LT4 heads are not 50-state legal for an LT1. They are "offroad use only."
Originally Posted by bogus
hm. where did you see that?
Also on the websites of the GM dealers that sell them.
Originally Posted by bogus
again, who will know?
