heres the cams i got. tell me what you think?
- Thread starter romgolferman
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nickmckinney
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- Sep 25, 2009
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trinity_gt
10 Year Member
Comp "recommends" the springs be done.
Interestingly, their page for those cams also reads "Always check piston to valve clearance as Ford used a variety of piston vendors & designs with these engines. Some combinations may require aftermarket pistons for clearance."
COMP Cams: Xtreme Energy™, XE270AH <BR> Excellent Torque, Better Low & Mid-Range Torque w/ Power
Never seen that before...
I don't imagine PTV would be a problem as long as the cams are degreed.
Yes, you can replace the springs in situ but it's a pain. I've got 262AHs and stock springs with no problems (yet...)
Interestingly, their page for those cams also reads "Always check piston to valve clearance as Ford used a variety of piston vendors & designs with these engines. Some combinations may require aftermarket pistons for clearance."
COMP Cams: Xtreme Energy™, XE270AH <BR> Excellent Torque, Better Low & Mid-Range Torque w/ Power
Never seen that before...
I don't imagine PTV would be a problem as long as the cams are degreed.
Yes, you can replace the springs in situ but it's a pain. I've got 262AHs and stock springs with no problems (yet...)
you will be really close to hitting your pistons with those cams. i would make sure they are degreed perfect if not retard them a degree to make sure. i would also swap springs. your already there and trick flow makes a tool that makes it easy. trust me i thought it would be hard but it really was not
Almost everybody on all the boards ended up having PTV issues with the 270's. You might search all the boards, corral, MPH, modularpowerhouse, the Depot, etc.
This has been one the most debated cams in 2v history. So many cars have had issues with them over the years and had serious valvetrain/motor problems.
This has been one the most debated cams in 2v history. So many cars have had issues with them over the years and had serious valvetrain/motor problems.
rispoli_23
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- Jul 7, 2008
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go with cms stage 1's just make sure they are degreed ... they mak good power and sound good .. my car had 60k on it and used the stock springs it now has 80k
I put in VT Stage 2 cams and decided to change out the springs anyways. It was a pita because we didn't have a very good spring tool. Anyways, I do have a video of pictures I took while my dad and I did the install..
http://csledd.com/ellie/cams/cams-install.wmv
http://csledd.com/ellie/cams/cams-install.wmv
nickmckinney
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Comp are still stuck in Chebbie land. Their springs they spec for PI heads are actually speced for NPI install heights and are a tenth of an inch off for PI heads. You install their specified springs in your PI heads and you are no better off than the stock springs.
At 113 intake centerline which is what they are doing now you have 0.000000001" of clearance in a stock PI motor no matter who made the piston.
I had (still have) the 270's in my car naturally aspirated with both stock pistons, and then a 5cc dish diamond. I never had ptv issues. I had the cams properly degreed and used the 113 springs, now I have 125's. I did however have the cams installed in SVO heads which may offer some additional clearance, but I am not sure on that. They have been decked like 3 times so any additional clearance is probably gone.
Honestly you should never re-use springs when going to a new cam profile. There are a multitude of reasons to change springs even if you just install new stock springs you are better off...even in a stage one cam.
I don't know of anyone who has swapped springs with the motor in the car.
I would never suggest re-using springs, especially when the cam has a different net lift and lift rate. You are setting yourself up for potential failure. Doing something right the first time is the best way to save money in this hobby. Good luck, the 270 is a great cam when properly installed properly.
Honestly you should never re-use springs when going to a new cam profile. There are a multitude of reasons to change springs even if you just install new stock springs you are better off...even in a stage one cam.
I don't know of anyone who has swapped springs with the motor in the car.
I would never suggest re-using springs, especially when the cam has a different net lift and lift rate. You are setting yourself up for potential failure. Doing something right the first time is the best way to save money in this hobby. Good luck, the 270 is a great cam when properly installed properly.
nickmckinney
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SVO (and NPI for that matter) heads have a full 1/10 of an inch more PTV clearance on the intake valve than a stock PI head. The 5.4 PI also has 1/10 of an inch more clearance than a 4.6 PI. 1/10 of an inch is like the Grand Canyon and the stock 4.6 PI is like a drainage ditch on the side of the road for comparison.
In my experience with the Comp 270's this has happened more often than not.
Crush!
nickmckinney
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An SVO head with a mild swirl dam and quench pad would have made monster power. If Ford would have made the SVO head with a smaller 42cc chamber like the PI head and installed it in the Mustang, it would have been something serious indeed.
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