which heads should i use on my 427 ls1 motor
09-08-2005, 09:01 AM
#21
We can do a great set of heads for your 427. We can do basically any size chamber you would like from 59cc to a 72cc and we can also do any of these in a 4.125" bore size. Our flow is comparable to other OEM ported heads. They will come with REV 2.08"/1.60" valves, Patriot Gold Duals, Ti retainers, Super 7 locks, Viton seals all for only $1,195.00.
09-08-2005, 09:20 AM
#22
Originally Posted by Gunnar@Patriot
We can do a great set of heads for your 427. We can do basically any size chamber you would like from 59cc to a 72cc and we can also do any of these in a 4.125" bore size. Our flow is comparable to other OEM ported heads. They will come with REV 2.08"/1.60" valves, Patriot Gold Duals, Ti retainers, Super 7 locks, Viton seals all for only $1,195.00.
09-08-2005, 06:00 PM
#23
Originally Posted by Patrick G
If you're talking ADVERTISED flow numbers, yes the TEA's show more flow. But if you're talking actual DYNO numbers, the LQ9 TEA Stage 3s have not shown power equal to their published flow numbers. The AFR 225s have consistently put down big dyno numbers...that's what should really count.
And for you to say TEA hasn't proven their heads is a very inaccurate statement. Phil97svt is just about in the 9's (10.00sec pass) on stock displacement. He put down 470 on the dyno with 5.3 stage 2.5's long before the 205's came out. That was with a cam remakably close to the one youre running now but mere XER lobes.
One other thing, why hasn't anyone reproduced Mamo's power on the dyno with the same heads/cam combo? Not even close. Your combo is not there even with a much bigger cam. Nice numbers by the way.
Last edited by Spinmonster; 09-08-2005 at 06:20 PM.
09-09-2005, 06:36 AM
#24
Originally Posted by Spinmonster
Also quick question, how did you get the flow information on the ported FAST and the LS7 intakes? I seriously doubt that the LS7 is even close to the FAST.
Read Tony Mamos comment in the following thread. "How does the intake manifold restrict air flow?" Last edited by gollum; 09-09-2005 at 06:52 AM.
09-09-2005, 10:26 AM
#25
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Ask the shops that have built the most 427s, such as W2W, MTI, ARE, etc.
Originally Posted by J02ws6transam
hey guys i am going to biuld a 427 ls1 this winter for my 02 ws6 and was wondering which heads i should use? how are the patriot heads? i was looking at there pricing and there prices are very reasonable for complete heads with nice rockers and everything, but im not too familiar with which company makes the best heads and that stage i should go with and all that. when i look at the stage i get confused sometimes as to which to go with. i would really appreciate any help. thanks again
Jon
Jon
09-09-2005, 12:12 PM
#26
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Originally Posted by gollum
That's an easy one to answer. The new high port LS7 heads with matching intake are available now at www.gmpartsdirect.com
Head part #12578450 $515.35
Intake part #12569011 $251.48
The new rockers and valves will soon be available also. Look in the LS2/LS7 section for part numbers.
Head part #12578450 $515.35
Intake part #12569011 $251.48
The new rockers and valves will soon be available also. Look in the LS2/LS7 section for part numbers.
09-09-2005, 12:49 PM
#27
Originally Posted by gollum
Read Tony Mamos comment in the following thread. "How does the intake manifold restrict air flow?" did you see any test on the LS7 manifold? I didn't. I read that article and agree very much with port matching. I have the FAST 90/90. My comments were about the LS7. Until its tested I'd also like to point out that that manifold wont even work with any AFR head or any head for that matter except the LS7 castings (only for a 4.125 bore mind you) due to the intake port shape so it isn't even in the running for most people.
09-09-2005, 03:48 PM
#28
I have no info on the LS7 intake or heads, but just "plain common sense tells me" it is a far better design for a large 427ci engine. If it wasn't GM would have never changed it. Going with the LS7 head and intake is a no brainer, performance and price wise.
FAST intake $700.00 vs. LS7 intake $251.50
Assembled AFR heads pair $2700.00 vs. Bare GM LS7 heads pair $1032.00
By going with the LS7 design he would have already saved $2000.00. Plenty left over for purchasing new matching valves, rockers, etc.
GOOD THINGS COME FOR THOSE WHO CAN WAIT !!! But for now I use nitrous.
FAST intake $700.00 vs. LS7 intake $251.50
Assembled AFR heads pair $2700.00 vs. Bare GM LS7 heads pair $1032.00
By going with the LS7 design he would have already saved $2000.00. Plenty left over for purchasing new matching valves, rockers, etc.
GOOD THINGS COME FOR THOSE WHO CAN WAIT !!! But for now I use nitrous.
Last edited by gollum; 09-09-2005 at 05:12 PM.
09-09-2005, 09:09 PM
#29
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ls7 small bore
Originally Posted by Spinmonster
Well thanks for including the link did you see any test on the LS7 manifold? I didn't. I read that article and agree very much with port matching. I have the FAST 90/90. My comments were about the LS7.
Until its tested I'd also like to point out that that manifold wont even work with any AFR head or any head for that matter except the LS7 castings (only for a 4.125 bore mind you) due to the intake port shape so it isn't even in the running for most people.
did you see any test on the LS7 manifold? I didn't. I read that article and agree very much with port matching. I have the FAST 90/90. My comments were about the LS7. Until its tested I'd also like to point out that that manifold wont even work with any AFR head or any head for that matter except the LS7 castings (only for a 4.125 bore mind you) due to the intake port shape so it isn't even in the running for most people.
I just wanted to mention that you have a good point, wont fit, too big of bore etc. It just so happens that the ls7 configuration fits well into our C5R style casting. we already produce the LS7 head for the large bore, and we are doing some programming modifications right now which proportionally shrinks the ports,chambers and valve locations to fit on the 4.00 and 3.900 bore engines, best part of all is that the LS7 manifold will still be a direct bolt on no matter what. Our LS7 heads will offer all the benifits of our cathederal port heads, thick deck, thick ports for additional porting upgrades and a better flowing exhaust port. The stock LS7 exhaust port only flows 215 without a pipe,ours flows 244 without a pipe. Our 4.125 version will use a 2.180-2.200 intake valve and our 4.00 bore version will use a 2.080-2.150 valve. I will post some pics later this month when we are done with the small bore version. they are avalible right now with a 3 week delivery from order. this will be a stout combination with a Scoggins 402 short block. Will probably make a bit more power than the factory LS7. So the guys who don't want to wait until they win the lottery and are able to buy a LS7, this woulod be a much cheaper alternative.
09-09-2005, 10:35 PM
#30
Originally Posted by gollum
I have no info on the LS7 intake or heads, but just "plain common sense tells me" it is a far better design for a large 427ci engine. If it wasn't GM would have never changed it. Going with the LS7 head and intake is a no brainer, performance and price wise.
FAST intake $700.00 vs. LS7 intake $251.50
Assembled AFR heads pair $2700.00 vs. Bare GM LS7 heads pair $1032.00
By going with the LS7 design he would have already saved $2000.00. Plenty left over for purchasing new matching valves, rockers, etc.
GOOD THINGS COME FOR THOSE WHO CAN WAIT !!! But for now I use nitrous.
FAST intake $700.00 vs. LS7 intake $251.50
Assembled AFR heads pair $2700.00 vs. Bare GM LS7 heads pair $1032.00
By going with the LS7 design he would have already saved $2000.00. Plenty left over for purchasing new matching valves, rockers, etc.
GOOD THINGS COME FOR THOSE WHO CAN WAIT !!! But for now I use nitrous.
09-09-2005, 10:47 PM
#31
Originally Posted by 11 Bravo
You also have to buy the LS7 pistons. Regular LS1 pistons will not work due to the different valve angle of the head. No biggie if you haven't bought pistons yet and do not want forged.
09-10-2005, 08:07 AM
#32
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Originally Posted by Beast96Z
The diffrent valve angle would require pistons IF P/V was of concern. 95% of the people on the market aren't going to run a cam that would be large enough to cause contact. This is assuming that you gain the added clearence that the diffrent valve angle gives you. I'm not sure if the LS-7 valve angle will give you added clearence, but the 11 degree heads from ET added another .150" of clearence over a conventional LS-1 head. I would only assume that the LS-7 would be the same. It's something to ponder.
https://ls1tech.com/forums/showthrea...3&page=1&pp=10
09-10-2005, 09:36 AM
#33
Originally Posted by Beast96Z
The diffrent valve angle would require pistons IF P/V was of concern. 95% of the people on the market aren't going to run a cam that would be large enough to cause contact. This is assuming that you gain the added clearence that the diffrent valve angle gives you. I'm not sure if the LS-7 valve angle will give you added clearence, but the 11 degree heads from ET added another .150" of clearence over a conventional LS-1 head. I would only assume that the LS-7 would be the same. It's something to ponder.
