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05-09-2008, 10:18 AM
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#1 (permalink)
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Bosscat
Join Date: Feb 2001
Posts: 25
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F303 E303 w/ 165 AFRs
Shooting for low to mid-range power, till about 6100rpms. Its a 68 block bored 60 over, block checked good at that bore, I think it comes out to a 311 in my math is correct.
I know these are fairly old cams, but I have them in my garage. Would I see that much better power with a new Comp Cams cam or another OTS cam?
Intake will be a an air gap, if I go carb, or Corbra/GT-40 if I go EFI.
11:1 Comp ratio using 94 oct gas and 75 shot, car will weigh around 3100 with driver, and shorty heads.
Gears will be 3.93s, with IRS if that means anything. Trans is a T5 good for 500hp w/ 2.95 first and .63 5th.
Thanks for any help,
Tony (in England)
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\'70 Boss 302 Cougar Eliminator
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05-10-2008, 04:20 AM
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#2 (permalink)
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Spali32
Join Date: Mar 2004
Posts: 879
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Re: F303 E303 w/ 165 AFRs
Sell it on Craigslist....Comp Cams XE cams for sure!! Way better performance.
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 www.spalisautodetailing.com
347 Stroker/XE284H(284/296 dur, 240/246 dur @ .050), BG 650 VS Speed Demon, Ported Victor Jr intake, Jack Roush World Product (ported from 180cc to 195cc) Jr Heads(upgraded to 2.02/1.60 valves) 260cfm/190cfm @ .550 lift, 11:1 comp... 450-475HP
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05-10-2008, 09:19 AM
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#3 (permalink)
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Bosscat
Join Date: Feb 2001
Posts: 25
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Re: F303 E303 w/ 165 AFRs
Looking at the cam numbers, it appears to be a pretty aggressive ramp on those cams for flat tappets, more stress on the valve train, wouldn't you think? Or am I way off base on this one?
Cheers,
Tony
______________________________________
\'70 Boss 302 Cougar Eliminator
Last edited by Bosscat : 05-10-2008 at 10:44 AM.
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05-10-2008, 02:20 PM
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#4 (permalink)
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Bumblebee
Join Date: Oct 2007
Posts: 769
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Re: F303 E303 w/ 165 AFRs
Bosscat
E303and F303 are rollers....
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Coming soon to a mid GA Blacktop 65 Galaxie LTD 2D Fastback Rescued Kudzu Queen 99 5.0, 93 GT40 Heads P&P'd, 10.2:1 hyper slugs,E303 Roller Cam, 1.6:1 roller rockers, Edelbrock performer intake, Holley 600, Shortie Headers.
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05-10-2008, 02:57 PM
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#5 (permalink)
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Bosscat
Join Date: Feb 2001
Posts: 25
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Re: F303 E303 w/ 165 AFRs
Yep, what I was getting at for a flat tappet the XEs have an aggressive ramp.
Bumblebee,
I see you have an E303, do you think it would be worth putting an XE into your engine, over your roller?
______________________________________
\'70 Boss 302 Cougar Eliminator
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05-10-2008, 05:14 PM
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#6 (permalink)
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Spali32
Join Date: Mar 2004
Posts: 879
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Re: F303 E303 w/ 165 AFRs
They are aggressive ramps for a reason....POWER. They are newer technology. Stress on the valvetrain?? They may work faster but it's not nothing to be concerned about having faster valvetrain motion. I'm sure Comp Cams put a lot of research/developement into building them.
Scroll down to 5.0 hydraulic rollers.
http://www.compcams.com/technical/Ca.../72-75_230.pdf
______________________________________
www.spalisautodetailing.com
347 Stroker/XE284H(284/296 dur, 240/246 dur @ .050), BG 650 VS Speed Demon, Ported Victor Jr intake, Jack Roush World Product (ported from 180cc to 195cc) Jr Heads(upgraded to 2.02/1.60 valves) 260cfm/190cfm @ .550 lift, 11:1 comp... 450-475HP
Last edited by Spali32 : 05-10-2008 at 06:43 PM.
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05-10-2008, 11:08 PM
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#7 (permalink)
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Bumblebee
Join Date: Oct 2007
Posts: 769
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Re: F303 E303 w/ 165 AFRs
I'm gonna stick with the e-303for this build. I have another 302 roller block I may play with a more aggressive cam later on. I am building on a budget right now (arent we all?) and got a deal on the 303.
Bumble
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Coming soon to a mid GA Blacktop 65 Galaxie LTD 2D Fastback Rescued Kudzu Queen 99 5.0, 93 GT40 Heads P&P'd, 10.2:1 hyper slugs,E303 Roller Cam, 1.6:1 roller rockers, Edelbrock performer intake, Holley 600, Shortie Headers.
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05-10-2008, 11:12 PM
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#8 (permalink)
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Bosscat
Join Date: Feb 2001
Posts: 25
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Re: F303 E303 w/ 165 AFRs
I hear ya, man 
______________________________________
\'70 Boss 302 Cougar Eliminator
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05-11-2008, 06:30 AM
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#9 (permalink)
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plovett
Join Date: Nov 2002
Posts: 103
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Re: F303 E303 w/ 165 AFRs
Just for everybody's info, here are the spec's on the two cams.
E303 - 282/282 degrees adv., 220/220 degrees @ 0.050, .498/.498 lift, 110 LSA.
F303 - 288/288 degrees adv., 226/226 degrees @ 0.050, .512/.512 lift, 114 LSA.
I like the tighter lobe separation angle of the E303, but your compression ratio is begging for more duration which makes me lean to the F303. The nitrous shot might like the wider LSA of the F303 better, too.
In my opinion, keep the motor carbureted and use the F303.
paulie
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1967 Cougar. 517 hp. 432 cid FE. C6, 9 inch rear.
Last edited by plovett : 05-11-2008 at 06:31 AM.
Reason: typo
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05-11-2008, 08:24 AM
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#10 (permalink)
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Bosscat
Join Date: Feb 2001
Posts: 25
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Re: F303 E303 w/ 165 AFRs
Paulie,
Thanks for the advice.
I am leaning towards EFI though, because of the price of gas, and it does not seem to be getting any cheaper.
Tony
______________________________________
\'70 Boss 302 Cougar Eliminator
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