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Topic: Telling the difference between a HO cam and otherwise? (Read 1286 times) previous topic - next topic

Telling the difference between a HO cam and otherwise?

Just like it says...
Going to pick up a cam in a day or two and I don't feel like being scammed.

Telling the difference between a HO cam and otherwise?

Reply #1
firing order is easiest way to tell

SO 1-5-4-2-6-3-7-8

HO 1-3-7-2-6-5-4-8


now if your getting a stock cam, as far as i know only 302 HO and 351w got this wiring order for the smallblocks. all aftermarket 5.0/5.8 cams got this firing order also. so if your only worried about getting a cam that will work with all the other componants you should be set. most people wont try to sell a lunati as if it were a regular HO.
1988 Thunderbird sport
2004 Ford F150 Lariat
2008  Chevrolet Cobalt Sport
2007 Suzuki DR-Z400S dual sport/Supermoto
1988 Thunderbird LX - sold
1988 Mercury Cougar XR-7 with GST kit - gone

Telling the difference between a HO cam and otherwise?

Reply #2
Quote from: grutinator;189068
firing order is easiest way to tell

SO 1-5-4-2-6-3-7-8

HO 1-3-7-2-6-5-4-8


now if your getting a stock cam, as far as i know only 302 HO and 351w got this wiring order for the smallblocks. all aftermarket 5.0/5.8 cams got this firing order also. so if your only worried about getting a cam that will work with all the other componants you should be set. most people wont try to sell a lunati as if it were a regular HO.


Well I know someone wouldnt pose a Lunati as a reg HO.
I am planning on buying a regular HO and don't want to be sold an SO.

The only way to identify it is by the lobe locations?

Telling the difference between a HO cam and otherwise?

Reply #3
its the only way i know of unless someone chimes in with an easier way.
1988 Thunderbird sport
2004 Ford F150 Lariat
2008  Chevrolet Cobalt Sport
2007 Suzuki DR-Z400S dual sport/Supermoto
1988 Thunderbird LX - sold
1988 Mercury Cougar XR-7 with GST kit - gone

Telling the difference between a HO cam and otherwise?

Reply #4
Don’t chance it buy new there cheap enough if you safe gamble is wrong your doing the job twice. New aftermarket cam is around 200. Stock is under 100.
Check out http://www.mustangsunlimited.com for stock replacements.

Telling the difference between a HO cam and otherwise?

Reply #5
I couldn't find it on the site, but thanks for the link, I most likely will be using that site.:hick:

Telling the difference between a HO cam and otherwise?

Reply #6
Quote from: 88XR7;189129
I couldn't find it on the site, but thanks for the link, I most likely will be using that site.:hick:


There web site sucks I can’t find it either in the catalog its on page 120 2 part #
M6250a311 goes for $70.95 duration 280*/290* 204/214  on 1.6 total lift 448I & 472E
M6250a312 goes for $64.95 duration 290/300 214/224 on 1.6 rr total lift 472I & 496E
Don’t know if there stock replacements but I’m assuming so. Maybe other will imput

Telling the difference between a HO cam and otherwise?

Reply #7
Quote from: Innes;189144
There web site sucks I can’t find it either in the catalog its on page 120 2 part #
M6250a311 goes for $70.95 duration 280*/290* 204/214  on 1.6 total lift 448I & 472E
M6250a312 goes for $64.95 duration 290/300 214/224 on 1.6 rr total lift 472I & 496E
Don’t know if there stock replacements but I’m assuming so. Maybe other will imput


I don't think they are but are close...
HO is 210/210 .444/.444

The first looks like a Cobra cam and isn't the second a TFS Stage 1?

Telling the difference between a HO cam and otherwise?

Reply #8
Quote
isn't the second a TFS Stage 1?


Nope...

TFS Stage 1 specs:
Intake Duration at 050 inch Lift: 221
Exhaust Duration at 050 inch Lift: 225
Duration at 050 inch Lift: 221 int./225 exh.
Advertised Intake Duration: 275
Advertised Exhaust Duration: 279
Advertised Duration: 275 int./279 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.499 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Valve Lift with Factory Rocker Arm Ratio: 0.499 int./0.510 exh. lift
Lobe Separation (degrees): 112


Both of those #'s are Ford Performance part #'s
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Telling the difference between a HO cam and otherwise?

Reply #9
the Ford A-311 and A-312 camshafts above are hyd. flat tappet camshafts for the older non roller engines. I've used both in the past (in my '65 Mustang coupe) with good results. The A-312 pulls really strong from around 4,000rpm-6,500rpm with a Edelbrock Performer RPM intake, Holley 600, and an Accel electronic distributor, on an otherwise stock '65 289. The A-311 pulls a little bit harder at low rpm (might work better in a heavy car like a T-bird), but not nearly as strong up top as the A-311. I also used the anti-pump up lifters with those cams. One thing I find interesting is the camshaft card that came with the A-311 I bought back in 1991 listed the advertised duration as 295/310 degrees instead of the current advertised 290/300, duration at .050 was listed the same as it is now.

Telling the difference between a HO cam and otherwise?

Reply #10
Quote from: Spraguepsycho1;189617
the Ford A-311 and A-312 camshafts above are hyd. flat tappet camshafts for the older non roller engines. I've used both in the past (in my '65 Mustang coupe) with good results. The A-312 pulls really strong from around 4,000rpm-6,500rpm with a Edelbrock Performer RPM intake, Holley 600, and an Accel electronic distributor, on an otherwise stock '65 289. The A-311 pulls a little bit harder at low rpm (might work better in a heavy car like a T-bird), but not nearly as strong up top as the A-311. I also used the anti-pump up lifters with those cams. One thing I find interesting is the camshaft card that came with the A-311 I bought back in 1991 listed the advertised duration as 295/310 degrees instead of the current advertised 290/300, duration at .050 was listed the same as it is now.


Looks like your right after readings what you said I opened the book again on the page w/all the ffrp cams shafts. The 2 I listed above actually state for 5.0L engine and liter type hydraulic all the rest (B,E,F,X, and Z303) for lifter type state hydraulic roller. Sorry cant use those
Looks like they are some good choices for the guys who don’t have roller motors 85 and older

Telling the difference between a HO cam and otherwise?

Reply #11
I'm actually going to be trying the A-311 in my '86 non ho roller block as soon as I can afford to buy a set of gaskets. Pulling the engine and aod from my T-Bird (freebie that has major electrical problems and body damage), and swaping it over to carb to put in my Mustang. I'll let everybody know how it works when it's done.