r3dn3ck, mattj, dustin, etc.

CCM · 02-18-2007, 09:30 PM

Can I run Comp 278's on my stock block safely? I've always thought the answer was no but now I'm looking on Corral.net and there's tons of guys selling them and saying they'll work fine on stock motors as long as they're PI (99+). What do you guys thinK?

3V2000GT · 02-18-2007, 10:08 PM

Yes you can run them, but you run a high risk of Piston to Valve contact (PTV)

MattJ · 02-18-2007, 10:12 PM

Quote:

Originally Posted by CCM

Can I run Comp 278's on my stock block safely? I've always thought the answer was no but now I'm looking on Corral.net and there's tons of guys selling them and saying they'll work fine on stock motors as long as they're PI (99+). What do you guys thinK?

I wouldnt run 278s without the heads to back it up. You would need to flycut your pistons so your car isnt singing the piston to valve song. Seeing how they are a more aggressive cam, youd lose power down low and make for it up top past 6100 where you shouldnt be anyways. I dont know what your intentions are with your car but id step down to 270s or some VT stage IIs unless you have a built engine in your future.

*03gtmustang* · 02-19-2007, 05:42 AM

Just what Matt said, the 278's are too aggressive for you and youll need fly cut pistons. Bigger doesnt always mean better.

A very knowledgeable guy always recommends 262ah, Crower 62801-2, or Hitech 2060. If you have stock heads, intake Id pick one of those three. If youve got ported heads, then Id go with 270's or VT stage 2's. As you probably know youll have to upgrade valve springs with the 270's and VT's, go with Crower or Manley Nextek (sp) springs.

spike_africa · 02-19-2007, 02:56 PM

the comp 270's are pushing it with a stock short block (piston to valve wise). 278's cant be used with a stock shortblock.

CCM · 02-19-2007, 07:27 PM

Thanks guys.

02-18-2007, 09:30 PM	#1 (permalink)
CCM Senior Member Join Date: Dec 2005 Location: Northern Virginia Posts: 1,382	r3dn3ck, mattj, dustin, etc. Can I run Comp 278's on my stock block safely? I've always thought the answer was no but now I'm looking on Corral.net and there's tons of guys selling them and saying they'll work fine on stock motors as long as they're PI (99+). What do you guys thinK? __________________ 2001 MINERAL GRAY GT (5-speed) H&R SuperSports MM 4-Bolt CC Plates Stoptech SS Brake Lines '03 Cobra Brakes Spec Billet Steel Flywheel Spec Stage 2 Clutch FRPP 4.10s X-Calibrator 2 Full Length Subframes Corbeau Legacy Racing Seats 18" Gunmetal Saleen Rims w/ Nitto 555s

02-18-2007, 10:08 PM	#2 (permalink)
3V2000GT 46MONSTER Join Date: Jan 2006 Location: Wheaton, IL Posts: 2,209	Yes you can run them, but you run a high risk of Piston to Valve contact (PTV) __________________ 2000 GT Black on Tan, TKO 600: 370rwhp 370rwtq NA Built 3v 2004 Honda CBR 600 F4i Black/Red 2000 SVT Lightning Silver i love jinny!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!! lucky is awesome!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

02-19-2007, 05:42 AM	#4 (permalink)
03gtmustang Super Moderator Join Date: Jan 2005 Location: Northern Va Posts: 3,245	Just what Matt said, the 278's are too aggressive for you and youll need fly cut pistons. Bigger doesnt always mean better. A very knowledgeable guy always recommends 262ah, Crower 62801-2, or Hitech 2060. If you have stock heads, intake Id pick one of those three. If youve got ported heads, then Id go with 270's or VT stage 2's. As you probably know youll have to upgrade valve springs with the 270's and VT's, go with Crower or Manley Nextek (sp) springs. __________________ D&D Auto Detailing -Dan

02-19-2007, 02:56 PM	#5 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 7,421	the comp 270's are pushing it with a stock short block (piston to valve wise). 278's cant be used with a stock shortblock. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!

02-19-2007, 07:27 PM	#6 (permalink)
CCM Senior Member Join Date: Dec 2005 Location: Northern Virginia Posts: 1,382	Thanks guys. __________________ 2001 MINERAL GRAY GT (5-speed) H&R SuperSports MM 4-Bolt CC Plates Stoptech SS Brake Lines '03 Cobra Brakes Spec Billet Steel Flywheel Spec Stage 2 Clutch FRPP 4.10s X-Calibrator 2 Full Length Subframes Corbeau Legacy Racing Seats 18" Gunmetal Saleen Rims w/ Nitto 555s

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode