Head and Cam combo help
Thread Starter
Instructor
Joined: Jul 2006
Posts: 159
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Head and Cam combo help
would these ebelbrock performer RPM heads work good with this comp cams extreme energy 274 cam??
heads:
64cc Combustion Chamber
170cc Intake Runner
2.02" Intake and 1.60" Exhaust Valves
1.46" Diameter Springs - .575" Max Lift
cam:
Duration at 050 inch Lift: 230 int./236 exh.
Advertised Intake Duration: 274
Advertised Exhaust Duration: 286
Advertised Duration: 274 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.487
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.490
Valve Lift with Factory Rocker Arm Ratio: 0.487 int./0.490 exh. lift
i want some performance but i dont want too much
thanks for lookin and comments are very welcome
heads:
64cc Combustion Chamber
170cc Intake Runner
2.02" Intake and 1.60" Exhaust Valves
1.46" Diameter Springs - .575" Max Lift
cam:
Duration at 050 inch Lift: 230 int./236 exh.
Advertised Intake Duration: 274
Advertised Exhaust Duration: 286
Advertised Duration: 274 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.487
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.490
Valve Lift with Factory Rocker Arm Ratio: 0.487 int./0.490 exh. lift
i want some performance but i dont want too much
thanks for lookin and comments are very welcome
Melting Slicks
Joined: Feb 2003
Posts: 2,529
Likes: 27
From: Auburndale Florida
2025 C2 of the Year ('64-'66) Finalist - Unmodified
St. Jude Donor '03-'05-'06-'07-'09
Need to know transmission and rear gear ratio.
I just built a 383, alum heads, ram horns, performer intake, roller cam (503/510 lift, 224/230 duration) for a 308 rear gear automatic car.
I just built a 383, alum heads, ram horns, performer intake, roller cam (503/510 lift, 224/230 duration) for a 308 rear gear automatic car.
Melting Slicks
Joined: Feb 2003
Posts: 2,529
Likes: 27
From: Auburndale Florida
2025 C2 of the Year ('64-'66) Finalist - Unmodified
St. Jude Donor '03-'05-'06-'07-'09
Its most likely a 308, that with an automatic you need to stay on the conservative side with duration numbers. Unless you are planning a torque converor change to a higher stall. Otherwise the car will bog, might sound good, but it wil not be any fun to drive. Others will chime, but I would not go much over a total duartion of 270 with a stock converter. So if you find a cam with modern profiles like Comps XE series, they have quick ramps and get a good duration @ .050 and still stay with the 270 total number. A real popular cam is the XE 262 and XE 268. Do some research. Its better to undercam than to overcam!!!
Melting Slicks
Joined: Feb 2003
Posts: 2,529
Likes: 27
From: Auburndale Florida
2025 C2 of the Year ('64-'66) Finalist - Unmodified
St. Jude Donor '03-'05-'06-'07-'09
Assuming the rear gear is a 308, I would recomend the XE 262 for a good solid fun to drive car and posible the XE 268...but nothing more. Unless you have a lower gear and a higher stall speed convereter.
Need to look at the VooDoo cams by Lunati. They have a nice cam about the same profiles but on a 112 LSA vs 110. The 112 would give a better idle, better vacuum for the lights, brakes etc and I am told the VooDoos are quieter than the Comp's XE from valve train noise
Need to look at the VooDoo cams by Lunati. They have a nice cam about the same profiles but on a 112 LSA vs 110. The 112 would give a better idle, better vacuum for the lights, brakes etc and I am told the VooDoos are quieter than the Comp's XE from valve train noise
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Le Mans Master
Joined: Oct 2001
Posts: 5,943
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From: Wildwood IL
I would like to see at least 180cc runners on your heads. Opens up top end flow quite a bit for any cam you choose, but still retains your low end torque. Don't know if those Edelbrocks are available in 180cc though....
Eddie
Eddie
Race Director
Joined: May 2005
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From: Millington Illinois
St. Jude Donor '08-'09
Also a better option for future upgrades.
Racer
Joined: Mar 2005
Posts: 393
Likes: 3
From: Dallas, TX
have you looked into any of the XS series cams, solid lifters that is with at least a 180 and maybe a 195 intake port, possibly an Comp Cams XS268S, heres the link to there catalog, http://www.compcams.com/technical/Ca...07/108-219.pdf certainly you can find a cam to suit your needs. good luck.
-alex
-alex
Thread Starter
Instructor
Joined: Jul 2006
Posts: 159
Likes: 0
the reason i want the 170cc is because i have this chevy high performance magazine and they tested a bunch of different heads on a 383 and the edelbrocks made more power and low end torque than competition products 180's, 6 less lb-ft and 3 less horsepower than trick flow 195's and more power and torque than dart 215's and the edelbrock 170's made the most average torque and most average horsepower out of the 8 different heads that they tested... im stickin with them, o and they were using the exact cam i mentioned but im goin with a smaller one thanks for all the help
Last edited by arctic74vette; Jan 23, 2007 at 12:00 PM.
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
...and on the page after the CHP article was a full-page Edelbrock ad?
In my opinion, a 170cc head on a 383 isn't enough unless you're building for a dump truck. Seems a 170 head would more suited for a 327 or 305 or something. I'd look at something at least in the 190 range for your 383 and don't worry about torque,..you'll have plenty with your 383. All things equal or fairly equal, no way a 170 head will produce the HP of a 190.
As far as cam, good suggestions above. You don't mention exhaust, but if you're installing good flowing heads and headers you'd be better off with a single pattern cam in my opinion,..maybe Comp's 270 Magnum (224* @ .50, .470" lift), or if you're staying with the 3.08's out back, Comp's HE-268 would be fine. A dual pattern would be more suited for stock manifolds and exhaust.
Good luck!
In my opinion, a 170cc head on a 383 isn't enough unless you're building for a dump truck. Seems a 170 head would more suited for a 327 or 305 or something. I'd look at something at least in the 190 range for your 383 and don't worry about torque,..you'll have plenty with your 383. All things equal or fairly equal, no way a 170 head will produce the HP of a 190.
As far as cam, good suggestions above. You don't mention exhaust, but if you're installing good flowing heads and headers you'd be better off with a single pattern cam in my opinion,..maybe Comp's 270 Magnum (224* @ .50, .470" lift), or if you're staying with the 3.08's out back, Comp's HE-268 would be fine. A dual pattern would be more suited for stock manifolds and exhaust.
Good luck!
Melting Slicks
Joined: Feb 2003
Posts: 2,529
Likes: 27
From: Auburndale Florida
2025 C2 of the Year ('64-'66) Finalist - Unmodified
St. Jude Donor '03-'05-'06-'07-'09
I have 190's on my 383.....bought the heads before my project evolved into a 383....If I was to do it over I would go for the 200-220;s with a modest roller cam...Think about a 396 with oval port heads...still bigger than 220 cc small block heads and almost the same cubes!!
Racer
Joined: Oct 2006
Posts: 435
Likes: 18
From: Florida
many good points made, but for mild performance, with a 268 cam a head that flows past .400 lift really isnt needed. with the auto this should be a responsive driver if thats your intentions. remember that crosss section not port volume is primary concern, inherent physical length on the big block head would account for more port volume.