Topic: rocker arm question
in Forum: C3 Engines
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jredding
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Miramar, FL - USA
Joined: 3/16/2004
Posts: 672
Vette(s): 1972 coupe/350 cid/mild cam/4 spd/20 ft. paint (looks perfect from 20 ft.), but it sure runs nice.
Can tired, stock heads benefit from a set of those fancy, anodized roller rockers or would it be throwing your money away? Some make claims of reduced oil and cylinder head temperatures. Can anybody confirm this?
Thanks.
JR
Thanks.
JR
Sarge81
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WEST SENECA, NY - USA
Joined: 12/3/2001
Posts: 2379
Vette(s): 1981 Blue Ice Met. w/pearl ghost flames
TKO500 5speed.
LS1 Swap
3.45 Dana 44.
I've heard of people gaining around 15+ hp with roller rockers. Less friction ='s more power and less heat. Right? But, I don't think that oil and cylinder head temps will be greatly lower though.
And if your heads are tired, I would personally have them freshened up, or get a good set of aftermarket heads. Just out of curiousity, what exactly are you looking to do or accomplish?
Sarge
And if your heads are tired, I would personally have them freshened up, or get a good set of aftermarket heads. Just out of curiousity, what exactly are you looking to do or accomplish?
Sarge
TKO500 5 spd.
Borgeson Steering Box
Born 8/1981
Sequence #3975
Click here to see more pics of my Vette on CarDomain.
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior.
All I need is time and money! Getting there!
Sarge is on the money. They can also help depending on the rocker ratio. If you increase the ratio, the valve opens further, and the engine breathes better.
But as aready asked, What is the problem now?
But as aready asked, What is the problem now?
jredding
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Miramar, FL - USA
Joined: 3/16/2004
Posts: 672
Vette(s): 1972 coupe/350 cid/mild cam/4 spd/20 ft. paint (looks perfect from 20 ft.), but it sure runs nice.
| Sarge81 said: Just out of curiousity, what exactly are you looking to do or accomplish? Sarge |
Trying to gain hp without venturing too deeply into the engine, I guess. Higher CFM carb and hi-rise manifold, headers, etc....you know, shadetree mechanic stuff. The previous owner installed a mild cam and nothing else. By the way, happy Veterans Day, Sarge.
JR
jredding
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Miramar, FL - USA
Joined: 3/16/2004
Posts: 672
Vette(s): 1972 coupe/350 cid/mild cam/4 spd/20 ft. paint (looks perfect from 20 ft.), but it sure runs nice.
| kstyer said: Sarge is on the money. They can also help depending on the rocker ratio. If you increase the ratio, the valve opens further, and the engine breathes better. |
That just opened a whole new can of worms for me, Ken. I had no idea there were varying rocker ratios. What's the stock ratio on a base engine 350(1972) and if you were gonna be conservative, what would you increase it to?
JR
BTW, there are no temperature issues.
|UPDATED|11/11/2004 5:37:11 PM (AZT)|/UPDATED|
Tumarr
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Batavia, IL - USA
Joined: 3/27/2003
Posts: 622
Vette(s): 496 big block, Dragvette 6 link, 12 bolt IRS conversion, Going for fastest Vette IRS E/T
Well stock is about 1.5 ratio and a common upgrade is 1.6 for small blocks. I am running 1.6 rollers right now on my motor.
|UPDATED|11/11/2004 5:49:11 PM (AZT)|/UPDATED|
|UPDATED|11/11/2004 5:49:11 PM (AZT)|/UPDATED|
jredding
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Miramar, FL - USA
Joined: 3/16/2004
Posts: 672
Vette(s): 1972 coupe/350 cid/mild cam/4 spd/20 ft. paint (looks perfect from 20 ft.), but it sure runs nice.
| Tumarr said: Well stock is about 1.5 ratio and a common upgrade is 1.6 for small blocks. I am running 1.6 rollers right now on my motor. |
Thanks, Tom....good info!
JR
cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
I like the comp cams magnum pro roller rockers
blackbigblock
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Welch, MN - USA
Joined: 7/18/2003
Posts: 201
Vette(s): 1974 Black 454 Stingray coupe, turbo 400 tranny, barry grant 750 carb, hooker super competition headers, moves along!
and what's the stock ratio on a bigblock, and what would be a good upgrade?? great info...
|IMG|http://www.imagestation.com/picture/sraid142/p29edeeda980a8aa16c5a61f6cbacf25e/f6a6be42.jpg|/IMG|
cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
stock ratio on a big block is 1.7... I have never seen anyone use a different ratio...
I just looked and it seems comp cams doesnt seem to sell a different ratio for the BB.. they sell 1.5,1.55,1.6,1.65 for the small block
I wonder why??
maybe Ken knows the answer !!
correction
in a few of their lines they sell various alternate sizes 1.6 (SS),1.72(mag),1.73(SS), and 1.8(SS)
but 1.7 seems to be the norm... there are many more options for every other engine..
|UPDATED|11/12/2004 2:44:04 AM (AZT)|/UPDATED|
I just looked and it seems comp cams doesnt seem to sell a different ratio for the BB.. they sell 1.5,1.55,1.6,1.65 for the small block
I wonder why??
maybe Ken knows the answer !!
correction
in a few of their lines they sell various alternate sizes 1.6 (SS),1.72(mag),1.73(SS), and 1.8(SS)
but 1.7 seems to be the norm... there are many more options for every other engine..
|UPDATED|11/12/2004 2:44:04 AM (AZT)|/UPDATED|
in Forum: C3 Engines
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