Engine guys help inexperianced please
Thread Starter
Instructor
Joined: Jan 2006
Posts: 165
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From: Richmond Tx
Engine guys help inexperianced please
Here is the set up as I got it. Opinions on changes especially heads. Thanks
1980
350 SB L48
Holly 750 w/Mech secondaries
Edelbrock Performer RPM Manifold
Stock heads
Hooker Headers
Erson Cam Hydraulic Flat Tappet, pn ERS-E110321, Duration 284/284, Lift 472/472
B&W Stall Converter, 2500
Hypertech Distributor/Ignition w/vacume advance
I don't know about pistons but will assume stock at this time. I plan to try to bore scope soone to determine if possible. I don't want to buy heads and then find out the compression will be wrong. Am I missing anything? Still learning.
1980
350 SB L48
Holly 750 w/Mech secondaries
Edelbrock Performer RPM Manifold
Stock heads
Hooker Headers
Erson Cam Hydraulic Flat Tappet, pn ERS-E110321, Duration 284/284, Lift 472/472
B&W Stall Converter, 2500
Hypertech Distributor/Ignition w/vacume advance
I don't know about pistons but will assume stock at this time. I plan to try to bore scope soone to determine if possible. I don't want to buy heads and then find out the compression will be wrong. Am I missing anything? Still learning.
Safety Car
Joined: Dec 2004
Posts: 4,071
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From: San Diego CA
284/284? The hell? That some wierd smog legal cam or something?
If your engine is basically stock, the best deal for the money on heads is GMPP Vortec heads. They'll bring your compression to about 9.5:1 as the '80 L48 is 8.2:1.
You got true duals?
If your engine is basically stock, the best deal for the money on heads is GMPP Vortec heads. They'll bring your compression to about 9.5:1 as the '80 L48 is 8.2:1.
You got true duals?
Thread Starter
Instructor
Joined: Jan 2006
Posts: 165
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From: Richmond Tx
Here is the poop from Erson
http://go.mrgasket.com/newproducts/CAT_PDF/ERSON.PDF
Fair idle. Reasonable fuel efficiency. Good low- and mid-range horsepower. Great camshaft for street rods or slightly modified street cars, 4-barrel and headers.
E110321 Hi-Flow AH ,2,250- 5,000 RPM, , Duration Advertized 284° IN .284° EX, Duration @.050 = 220 IN, 220EX, Gross Lift 472" IN 472" EX ,Lobe center 108°, Advance 0° , Valve Lash .000" IN ..000" EX
http://go.mrgasket.com/newproducts/CAT_PDF/ERSON.PDF
Fair idle. Reasonable fuel efficiency. Good low- and mid-range horsepower. Great camshaft for street rods or slightly modified street cars, 4-barrel and headers.
E110321 Hi-Flow AH ,2,250- 5,000 RPM, , Duration Advertized 284° IN .284° EX, Duration @.050 = 220 IN, 220EX, Gross Lift 472" IN 472" EX ,Lobe center 108°, Advance 0° , Valve Lash .000" IN ..000" EX
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Safety Car
Joined: Dec 2004
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From: San Diego CA
Originally Posted by jackson
Higs: you're on the right track ... scope cylinder to determine piston type (dish/flat/dome).
Kalway: 284* is advertized duration ... probably 215*to 225* @ 0.050"
Kalway: 284* is advertized duration ... probably 215*to 225* @ 0.050"
Lot of duration for 8.2:1 compression.
Safety Car
Joined: Dec 2004
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From: San Diego CA
Well your exhaust is done. Your intake is good, you're already cam'd. Next step looks like heads, to me. I'm looking at GMPP Vortec heads, due to the price. Requires a vortec compatible intake manifold and self-aligning rockers but I'm a fan of the vortec head design. Good bump up in compression from those 76cc heads, as the GMPP ones are 64cc.
Thread Starter
Instructor
Joined: Jan 2006
Posts: 165
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From: Richmond Tx
What do you think about Edelbrock RPM 202 Heads, 64CC? Just trying to find some heads that will mate up well with the intake and bump the compression some if the pistons are stock. Not sure about the CC's and how they effect things. Also, please someone explain the difference in "Advertised Duration" and "Duration @.050". Appreciate the help.
Pro
Joined: Jan 2002
Posts: 624
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From: Marietta ga
duration @ .050 is measured as implied, .050 up the lobe ramp. Different cam companies have different standards of duration based on where they say the ramp begins. By using a standard starting point, .050, you can compair different cams from different companies....
Le Mans Master
Joined: Sep 2001
Posts: 7,739
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From: Unreconstructed, South Carolina
Originally Posted by Kalway
@.050 it would be ~226 because mine is 272/282 and 214/224 @.050.
Pro
Joined: Feb 2004
Posts: 564
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From: Pittsburgh PA
I agree with the above posts. As long as you don't push past 5500-6000, your pistons (assuming stock cast) should live fine.
The last step is to install some good IRON heads (since you're probably running low compression, I'd stay with iron heads- aluminum heads allow more compression before detonation, but because they are a more efficient conductor of heat, they actually make less HP then identical iron heads, where the heat isn't dumped to the cooling system, but adds to the burned gases pushing the pistons down harder). Don't bother with valve sizes less than 2.02 intake, 1.60 exhaust. If you can afford to find some that have been ported, than even better!
Finally, I'd recommend looking at the Innovate LC-1 O2 sensing system, to dial-in your carb, and find out where the actual air-fuel ratio is at... Between dialing in your carb, and playing with your ignition, you'll have enough HP to keep you happy....
At least, for a WHILE...........
The last step is to install some good IRON heads (since you're probably running low compression, I'd stay with iron heads- aluminum heads allow more compression before detonation, but because they are a more efficient conductor of heat, they actually make less HP then identical iron heads, where the heat isn't dumped to the cooling system, but adds to the burned gases pushing the pistons down harder). Don't bother with valve sizes less than 2.02 intake, 1.60 exhaust. If you can afford to find some that have been ported, than even better!
Finally, I'd recommend looking at the Innovate LC-1 O2 sensing system, to dial-in your carb, and find out where the actual air-fuel ratio is at... Between dialing in your carb, and playing with your ignition, you'll have enough HP to keep you happy....
At least, for a WHILE...........
Safety Car
Joined: Dec 2004
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From: San Diego CA
Originally Posted by jackson
You cannot figure it exactly ... because the relationship between ADV & 050 is not linear ... different cams have different major & minor intensities ... that's why I stated a range. Once upon a time many cams were symmetrical ... plenty new ones still are.
Pro
Joined: Feb 2004
Posts: 564
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From: Pittsburgh PA
Originally Posted by Higs
For what it's worth the casting # on my current heads is 462624 & B27-0. Thanks
http://forums.corvetteforum.com/showthread.php?t=274504