new forged motor
08-30-2005, 03:25 PM
#1
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new forged motor i have a few questions, been on the search button for 3 days now, i have a forged 347 with 6.125 eagle h-beam rods and diamonds custom nitrous pistons with the -2cc valve reliefs. i had home ported heads and thunders 224/224-112 cam with hooker 1 3/4 long tubes and shaner s2 throttle body and 36 injectors on a ls1 intake and made 374 to the rear wheels n/a and ran a best of 11.46 @120.22mph with a 1.8 60ft with a 100 dry shot. since then i have put dual 255 intank walbros and 60lb motorons and ran 12psi of boost for 1 month till i took the kit back off. so now i have more than enough fuel system for my n/a motor but i am tearing it down now to the bare shortblock. so now i have a solid motor to work from, the motor has a lil over 8500 miles on it now. i am wanting to add a cam, heads, and a fast intake over the next 2 months. my cam choice is thunders trex cam, and i am awaiting a reply from patriot on which heads to go with, i am leaning toward the 5.3 heads.
so my questions are
(1) if i go with the 5.3 heads and trex cam will i have any piston to valve clearence issues?
(2) should i remove the 60lb motorons and replace them with my 36lb injector? i plan on spraying a 200 dry ( i drove the car a month n/a with the 60lb and my ltft looked great and the car ran good)
(3) is the 90/90 fast worth it on my 347 with the trex and 5.3 heads?
i am wanting around 450ish to 480 if possible then hitting her with a 200 dry shot. the car is my weekend toy
thanks for the help
so my questions are
(1) if i go with the 5.3 heads and trex cam will i have any piston to valve clearence issues?
(2) should i remove the 60lb motorons and replace them with my 36lb injector? i plan on spraying a 200 dry ( i drove the car a month n/a with the 60lb and my ltft looked great and the car ran good)
(3) is the 90/90 fast worth it on my 347 with the trex and 5.3 heads?
i am wanting around 450ish to 480 if possible then hitting her with a 200 dry shot. the car is my weekend toy
thanks for the help
08-30-2005, 06:36 PM
#2
Originally Posted by BIRDONNOS
i have a few questions, been on the search button for 3 days now, i have a forged 347 with 6.125 eagle h-beam rods and diamonds custom nitrous pistons with the -2cc valve reliefs. i had home ported heads and thunders 224/224-112 cam with hooker 1 3/4 long tubes and shaner s2 throttle body and 36 injectors on a ls1 intake and made 374 to the rear wheels n/a and ran a best of 11.46 @120.22mph with a 1.8 60ft with a 100 dry shot. since then i have put dual 255 intank walbros and 60lb motorons and ran 12psi of boost for 1 month till i took the kit back off. so now i have more than enough fuel system for my n/a motor but i am tearing it down now to the bare shortblock. so now i have a solid motor to work from, the motor has a lil over 8500 miles on it now. i am wanting to add a cam, heads, and a fast intake over the next 2 months. my cam choice is thunders trex cam, and i am awaiting a reply from patriot on which heads to go with, i am leaning toward the 5.3 heads.
so my questions are
(1) if i go with the 5.3 heads and trex cam will i have any piston to valve clearence issues? No, you already have valve reliefs so you should be good to go.
(2) should i remove the 60lb motorons and replace them with my 36lb injector? i plan on spraying a 200 dry ( i drove the car a month n/a with the 60lb and my ltft looked great and the car ran good) 200 dry on top of 450 rwhp is too big for 36 lb injectors. 60s are a little on the big side, but if you keep it running well, I'd keep them. Just do some really careful tuning for the dry shot (timing retard and A/F ratio).
(3) is the 90/90 fast worth it on my 347 with the trex and 5.3 heads?
Absolutely. I picked up 28 rwhp with my Mamo ported FAST 90 and Nick Williams 90 TB.
i am wanting around 450ish to 480 if possible then hitting her with a 200 dry shot. the car is my weekend toy
thanks for the help
so my questions are
(1) if i go with the 5.3 heads and trex cam will i have any piston to valve clearence issues? No, you already have valve reliefs so you should be good to go.
(2) should i remove the 60lb motorons and replace them with my 36lb injector? i plan on spraying a 200 dry ( i drove the car a month n/a with the 60lb and my ltft looked great and the car ran good) 200 dry on top of 450 rwhp is too big for 36 lb injectors. 60s are a little on the big side, but if you keep it running well, I'd keep them. Just do some really careful tuning for the dry shot (timing retard and A/F ratio).
(3) is the 90/90 fast worth it on my 347 with the trex and 5.3 heads?
Absolutely. I picked up 28 rwhp with my Mamo ported FAST 90 and Nick Williams 90 TB.
i am wanting around 450ish to 480 if possible then hitting her with a 200 dry shot. the car is my weekend toy
thanks for the help
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
08-31-2005, 02:20 AM
#3
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If the 5.3L heads are unmilled they should clear the pistons especially with the valve reliefs. I don't think that the compression or head flow is high enough to get that kind of rear wheel power. I don't think you mentioned whether you have a4 or m6 or other tranny in mind. I would do the 90/90 setup with the 60 lb injectors if you are going to use a 200 dry shot. It will run weaker on the motor with a nitrous tune and colder plugs on the motor. You will need to drop some timing with a 200 shot. I would run at least 105 octane unleaded also.
