What heads should I use on a 427
12-05-2014, 02:34 PM
#22
TECH Veteran
WCCH and several others have a solution to the guide issue. Stage 2 LS7 heads from WCCH can make big NA power, seen that. Call vendors directly and get their advise, never hurts to ask. Ported LS3, LS7, aftermarket square and cathedral port heads can get you to your goal. Be realistic about what kind of power delivery you want. IMO, a nasty high rpm motor can be less fun than a wide powerband motor 80% of the time on the street. Good luck.
This is kinda why I put a huge cathedral head over a square port on this type of build. You find a great powerband and a very responsive motor with a cathedral head over a rectangle. I've owned both..... I'm now running a rectangle head.
12-06-2014, 12:47 AM
#24
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TFS LS7 & 102 FAST, Better yet hopefully MSD Intake will get you
To 600+ RWHP W/ ~238* .650 / ~246* .630 (114-115 LSA +3-4 ADV)
with~ 420-440 lb ft @ 2500 RPM,~540 lb ft @ ~ 5200 and ~620 RWHP by
6500 RPM W/ 11.5:1 Comp 434
to reach 600 RWHP W/ any Cathedral will take ~12-15* more intake
And exhaust duration due to the fact of the cathedral intake choking
30-40 CFM per runner. How will low rpm throttle response be W/
250+ intake duration and 6-8* more exhaust duration from 2-4K
Be?
Check out WKMD Gentleman Cruiser build 575 RWHP @ 6200RPM
530 RW lb ft @ 5200 w/ 420 @ 2200RPM W/ WCCH L92s!
A small cam not much bigger then 234/240 (don't know exactly)
in a C5. TFS LS7 flow much better and are smaller ports and the
Fast LS7 102 flows better then the LS3 Fast also.
To 600+ RWHP W/ ~238* .650 / ~246* .630 (114-115 LSA +3-4 ADV)
with~ 420-440 lb ft @ 2500 RPM,~540 lb ft @ ~ 5200 and ~620 RWHP by
6500 RPM W/ 11.5:1 Comp 434
to reach 600 RWHP W/ any Cathedral will take ~12-15* more intake
And exhaust duration due to the fact of the cathedral intake choking
30-40 CFM per runner. How will low rpm throttle response be W/
250+ intake duration and 6-8* more exhaust duration from 2-4K
Be?
Check out WKMD Gentleman Cruiser build 575 RWHP @ 6200RPM
530 RW lb ft @ 5200 w/ 420 @ 2200RPM W/ WCCH L92s!
A small cam not much bigger then 234/240 (don't know exactly)
in a C5. TFS LS7 flow much better and are smaller ports and the
Fast LS7 102 flows better then the LS3 Fast also.
12-06-2014, 12:12 PM
#25
I had a customer that had the worn guides in his LS7, but the valves hadn't dropped and there wasn't any major damage. We put in bronze guides and Manley exhaust valves, cut the valvejob and ported the heads, and it's been fine since then.
12-07-2014, 11:21 PM
#26
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Unfortunately my finances aren't going to allow me to sleeve the LS2 block. I've decided to punch it out to 4.030" and throw my stroker kit in it. I can't decide which pistons to get tho. I'm stuck between Manley -4cc flat tops (592630C-8) for 600.00 or Wiseco -3cc dome's (K464X3) for 728.00. Trying to research what is the better piston.
As for heads I'm thinking about going with the TFS/TEA 225's or 235's. Leaning towards the 235's for growth potential unless it's going to make my combo run like dogshit or I run across a deal on 225's I can't pass up. I'll be using the MSD air force intake with a holley 105 tapered TB and most likely a 235/245 .640/.649 111 cam. Seems to be a proven cam with TFS 225's on 6.0's. I'm thinking with the 408 it should do even better...especially on a street car.
My funds can make this happen so I can't go anymore exotic on the heads.
Anyone see any potential problems? Advice or recommendations?
As for heads I'm thinking about going with the TFS/TEA 225's or 235's. Leaning towards the 235's for growth potential unless it's going to make my combo run like dogshit or I run across a deal on 225's I can't pass up. I'll be using the MSD air force intake with a holley 105 tapered TB and most likely a 235/245 .640/.649 111 cam. Seems to be a proven cam with TFS 225's on 6.0's. I'm thinking with the 408 it should do even better...especially on a street car.
My funds can make this happen so I can't go anymore exotic on the heads.
Anyone see any potential problems? Advice or recommendations?
12-08-2014, 05:06 AM
#27
TECH Veteran
Unfortunately my finances aren't going to allow me to sleeve the LS2 block. I've decided to punch it out to 4.030" and throw my stroker kit in it. I can't decide which pistons to get tho. I'm stuck between Manley -4cc flat tops (592630C-8) for 600.00 or Wiseco -3cc dome's (K464X3) for 728.00. Trying to research what is the better piston.
As for heads I'm thinking about going with the TFS/TEA 225's or 235's. Leaning towards the 235's for growth potential unless it's going to make my combo run like dogshit or I run across a deal on 225's I can't pass up. I'll be using the MSD air force intake with a holley 105 tapered TB and most likely a 235/245 .640/.649 111 cam. Seems to be a proven cam with TFS 225's on 6.0's. I'm thinking with the 408 it should do even better...especially on a street car.
My funds can make this happen so I can't go anymore exotic on the heads.
Anyone see any potential problems? Advice or recommendations?
As for heads I'm thinking about going with the TFS/TEA 225's or 235's. Leaning towards the 235's for growth potential unless it's going to make my combo run like dogshit or I run across a deal on 225's I can't pass up. I'll be using the MSD air force intake with a holley 105 tapered TB and most likely a 235/245 .640/.649 111 cam. Seems to be a proven cam with TFS 225's on 6.0's. I'm thinking with the 408 it should do even better...especially on a street car.
My funds can make this happen so I can't go anymore exotic on the heads.
Anyone see any potential problems? Advice or recommendations?
12-08-2014, 03:09 PM
#28
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Found this some what dated article http://www.hotrod.com/how-to/engine/...top-ls7-heads/
Interesting read if you haven't seen it.
OldCop
Interesting read if you haven't seen it.
OldCop
12-08-2014, 11:43 PM
#30
TECH Veteran
No problem. Here you go. Great link to one of the baddest n/a 6 speed cars I've seen posted on tech.
https://ls1tech.com/forums/dynamometer-results-comparisons/1372582-402-afr-205-s.html
https://ls1tech.com/forums/dynamometer-results-comparisons/1372582-402-afr-205-s.html
12-09-2014, 09:05 PM
#31
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I would definitely go TFS 235s or AFR 230s from Tony,
On any Bore under 4.060.
Check out the 347 W/ 215s and a small cam results in the
Gen3 Internal section
On any Bore under 4.060.
Check out the 347 W/ 215s and a small cam results in the
Gen3 Internal section
12-10-2014, 06:14 AM
#32
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I ended up going with TEA/TFS 235's with PM guides and hollow intake valves and PAC .660 springs with Ti Retainers. 65cc Chambers.
Last edited by drain89; 12-15-2014 at 09:28 PM.