[C1] 327CI/300HP Camshaft USA made
02-14-2019, 12:38 PM
#1
Instructor
Thread Starter
327CI/300HP Camshaft USA made
Since I am buying #matching heads for my 58, thought I also replace the cam/lifters/timing chain.
I like to get something like the blueprint 327 engine/300HP cam, because I think I've got 327ci/350HP cam exhibiting low vacuum (12) at idle and not so much low end torque.
Which camshaft manufacturer is USA made?
I had a new Elgin cam kept in box in door but now after 18-years rust.
Thanks,
Eric
I like to get something like the blueprint 327 engine/300HP cam, because I think I've got 327ci/350HP cam exhibiting low vacuum (12) at idle and not so much low end torque.
Which camshaft manufacturer is USA made?
I had a new Elgin cam kept in box in door but now after 18-years rust.
Thanks,
Eric
02-14-2019, 12:46 PM
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2015 C2 of Year Finalist
Sealed Power made by Federal Mogel should be USA made yet
02-14-2019, 04:13 PM
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The 327/350 is not short of torque at low rpm.
02-14-2019, 04:59 PM
#4
Instructor
Thread Starter
Just stock replacement type.
Motor rebuilt prior owner 1980s and compression when I check was around #125.
I figured the 300HP cam would be best all around?
Aloha,
Eric
Motor rebuilt prior owner 1980s and compression when I check was around #125.
I figured the 300HP cam would be best all around?
Aloha,
Eric
02-14-2019, 06:02 PM
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See post #2.
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Nowhere Man (02-14-2019)
02-14-2019, 08:32 PM
#6
Le Mans Master
If your compression is only at 125 you have something wrong.
Wrong heads with large chambers.
Wrong Pistons with a dished design
Way too much camshaft with overlap bleeding your compression down, this would give you a rough lumpity lump idle.
Engine is flat worn out
Since you mention you are changing back to factory heads I suspect you have the wrong heads on that engine.
I would think a factory 327 would have between 150 and 200 pounds compression depending on the pistons installed, the factory heads were pretty close to 64cc in most cases back then.
Later heads if installed may be 72 or 76cc dropping your compression.
If you have an L79 cam in that car it would not respond well to large chamber heads.
Get your head casting numbers and see what you are working with.
Mark
Wrong heads with large chambers.
Wrong Pistons with a dished design
Way too much camshaft with overlap bleeding your compression down, this would give you a rough lumpity lump idle.
Engine is flat worn out
Since you mention you are changing back to factory heads I suspect you have the wrong heads on that engine.
I would think a factory 327 would have between 150 and 200 pounds compression depending on the pistons installed, the factory heads were pretty close to 64cc in most cases back then.
Later heads if installed may be 72 or 76cc dropping your compression.
If you have an L79 cam in that car it would not respond well to large chamber heads.
Get your head casting numbers and see what you are working with.
Mark
02-15-2019, 01:15 PM
#7
Eric, I asked this same question several years back on another Corvette forum. Duke Williams has a lot of information about building this particular engine. His recommendation for the camshaft was to use a Sealed Power #CS 274. A label claims it is manufactured in the U.S.A.
Ken
Ken
02-16-2019, 10:52 AM
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Sealed Power (Federal Mogul) CS-274 is built to the GM blueprints for the 3896929 camshaft, which was used in probably a couple of million engines from the late sixties to the early eighties, including the '67 327/300 HP engine used in Corvettes and other Chevrolet models. This is commonly referred to at the "300 HP" camshaft. It replaced the prior base engine camshaft used from '57 to '66, which is long out of production. The ...929 had identical performance characteristics, nearly the same specs, but milder lobe dynamics, so it's easier on the valve train.
The CS-274 can be purchased for as little as 50 bucks. I also recommend the truck roller timing chain, Cloyes C-3023K truck roller chain, about 25 bucks.
Another option if you want 300 HP type idle behavior and low end torque with L-79 type top end power and revs is the "Special 300 HP" configuration with the McCaw Special camshaft. Search thread started by me and study the "Tale of Two Camshafts" article for all the details.
napaonline.com is a good site to find OE replacement parts manufactured by Federal Mogul, however, these same parts are available in other "brands" via different marketing channels, so select a supplier based on price and convenience.
Duke
The CS-274 can be purchased for as little as 50 bucks. I also recommend the truck roller timing chain, Cloyes C-3023K truck roller chain, about 25 bucks.
Another option if you want 300 HP type idle behavior and low end torque with L-79 type top end power and revs is the "Special 300 HP" configuration with the McCaw Special camshaft. Search thread started by me and study the "Tale of Two Camshafts" article for all the details.
napaonline.com is a good site to find OE replacement parts manufactured by Federal Mogul, however, these same parts are available in other "brands" via different marketing channels, so select a supplier based on price and convenience.
Duke