LT-1 camshaft in base 71 engine
Thread Starter
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
LT-1 camshaft in base 71 engine
I'm changing the camshaft in my base 71 350 with 270 bhp numbers matching all original engine.
Can I put the LT-1 camshaft in and hope for the same horsepower?
I have Performer intake and long tube headers on the car.
Or are there better camshafts on market to go with stock setup?
Can I put the LT-1 camshaft in and hope for the same horsepower?
I have Performer intake and long tube headers on the car.
Or are there better camshafts on market to go with stock setup?
Dr. Detroit
Joined: Mar 2012
Posts: 10,093
Likes: 4,017
From: New Braunfels Texas
Use the 262 Comp for automatic and the 268H for 4 speed......both cams will boost power about 40-50 hp over the stock 270hp cam......will run excellent with the 2101 Performer and long tubes.
The factory LT-1 cam is a solid lifter deal and you do not have studs and the guide plates necessary for this........
Jebby
The factory LT-1 cam is a solid lifter deal and you do not have studs and the guide plates necessary for this........
Jebby
Thread Starter
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
Use the 262 Comp for automatic and the 268H for 4 speed......both cams will boost power about 40-50 hp over the stock 270hp cam......will run excellent with the 2101 Performer and long tubes.
The factory LT-1 cam is a solid lifter deal and you do not have studs and the guide plates necessary for this........
Jebby
The factory LT-1 cam is a solid lifter deal and you do not have studs and the guide plates necessary for this........
Jebby
Does this cam provide enough vacuum for power brakes?
Do you have the complete part number of the cam?
Primoz
Last edited by Primoz; Oct 22, 2021 at 12:12 PM.
Dr. Detroit
Joined: Mar 2012
Posts: 10,093
Likes: 4,017
From: New Braunfels Texas
https://www.summitracing.com/parts/cca-k12-262-4
You should install at least roller tipped Comp Magnum rocker....and make sure you measure the pushrod with the quick checker.......buy only 1 piece pushrods from Trick Flow or Trend. A set of umbrella valve seals from Sealed Power is perferred too. You will need an adjustable length pushrod as well.
The 262 or 268H provide plenty of vacuum for brakes and lights/wipers.
https://www.summitracing.com/parts/man-42137
Jebby
Last edited by Jebbysan; Oct 22, 2021 at 12:25 PM.
Thread Starter
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
I got recommended CompCams High Energy CL12-210-2 and avoid xtreme energy and go with high energy and magnum ones.
Recommendation came from very respectable builder.
The whole kit:
https://www.summitracing.com/parts/cca-k12-210-2
Recommendation came from very respectable builder.
The whole kit:
https://www.summitracing.com/parts/cca-k12-210-2
Last edited by Primoz; Oct 22, 2021 at 12:33 PM.
Dr. Detroit
Joined: Mar 2012
Posts: 10,093
Likes: 4,017
From: New Braunfels Texas
I got recommended CompCams High Energy CL12-210-2 and avoid xtreme energy and go with high energy and magnum ones.
Recommendation came from very respectable builder.
The whole kit:
https://www.summitracing.com/parts/cca-k12-210-2
Recommendation came from very respectable builder.
The whole kit:
https://www.summitracing.com/parts/cca-k12-210-2
It will run well with the 268H and the th400.
Jebby
Last edited by Jebbysan; Oct 22, 2021 at 01:02 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,365
Likes: 6,345
From: At my Bar drinking and wrenching in Lafayette Colorado
Primoz -
I see you're fact-checking me against Jebby... that's pretty funny... Do you know that Jebby and I work together and share info on a lot of this stuff? We both have similar backgrounds and do the same type of work. You can usually ask both of us the same question, and you'll get the same answer without either of us talking to the other... (but we usually do anyway).
Lars
I see you're fact-checking me against Jebby... that's pretty funny... Do you know that Jebby and I work together and share info on a lot of this stuff? We both have similar backgrounds and do the same type of work. You can usually ask both of us the same question, and you'll get the same answer without either of us talking to the other... (but we usually do anyway).
Lars
Last edited by lars; Oct 22, 2021 at 09:02 PM.
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Thread Starter
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
Primoz -
I see you're fact-checking me against Jebby... that's pretty funny... Do you know that Jebby and I work together and share info on a lot of this stuff? We both have similar backgrounds and do the same type of work. You can usually ask both of us the same question, and you'll get the same answer without either of us talking to the other... (but we usually do anyway).
Lars
I see you're fact-checking me against Jebby... that's pretty funny... Do you know that Jebby and I work together and share info on a lot of this stuff? We both have similar backgrounds and do the same type of work. You can usually ask both of us the same question, and you'll get the same answer without either of us talking to the other... (but we usually do anyway).
Lars
Thanks to you and Jebby for all the help and advice! Greatly appreciated!
Last edited by Primoz; Oct 22, 2021 at 11:01 PM.
Burning Brakes
Joined: Oct 2020
Posts: 1,148
Likes: 265
From: The frozen wastes...
I've noticed you usually recommend this one for stockish builds. Is that due to the stock head limitations? A few ov my friends have 275-280ish range cams in their 350's, and they work great. None are running stock, untouched heads though. I'm also assuming 4-speed, and no converter BS to deal with.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,170
From: Hermosa
Look at the dyno profiles on the two cams provided by comp.
They are almost identical with the 262 slightly outperforming the 268 at the top of the rpm range. The 262 provides more vacuum if you want that. The dyno's are results from 9:25:1 CR. If you're lower than that ( you likely are) I would go with the 262 vs the 268 just due to better torque due to less duration and overlap. However the 268 does have better valve lift and more duration, a good choice for more CR if that's something you might be looking to do. I suspect if the cr was closer to 10:1 the 268 would outperform the 262 by a pretty good margin.
https://www.compcams.com/xe268h
https://www.compcams.com/xe262h
They are almost identical with the 262 slightly outperforming the 268 at the top of the rpm range. The 262 provides more vacuum if you want that. The dyno's are results from 9:25:1 CR. If you're lower than that ( you likely are) I would go with the 262 vs the 268 just due to better torque due to less duration and overlap. However the 268 does have better valve lift and more duration, a good choice for more CR if that's something you might be looking to do. I suspect if the cr was closer to 10:1 the 268 would outperform the 262 by a pretty good margin.
https://www.compcams.com/xe268h
https://www.compcams.com/xe262h
Dr. Detroit
Joined: Mar 2012
Posts: 10,093
Likes: 4,017
From: New Braunfels Texas
Jebby
Dr. Detroit
Joined: Mar 2012
Posts: 10,093
Likes: 4,017
From: New Braunfels Texas
I've noticed you usually recommend this one for stockish builds. Is that due to the stock head limitations? A few ov my friends have 275-280ish range cams in their 350's, and they work great. None are running stock, untouched heads though. I'm also assuming 4-speed, and no converter BS to deal with.
A 406 has no lack of torque so I put a “bottom of the page cam” in it…..but it runs and drives VERY nice….a lot of this has to do with the Dart wet flow heads….
Back to the 268H…..it is a solid old grind…..
Interesting on the 262…..
The 268H sounds a lot lot better….I can tell you that…..
I doubt highly you could tell the power of the two cams back to back….but for an auto, the 262 pulls a converter better….
Maybe I am biased by sound! Lol!!!
Jebby
Thread Starter
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
Also another thing.
If I wan't to go with roller cam does that provide any additional bonuses for me and my street/weekend style driving? Or is just an expensive option minding that I opearate on a budget?
Last edited by Primoz; Oct 24, 2021 at 06:32 AM.
Pro
Joined: Jul 2021
Posts: 719
Likes: 156
No matter what your budget is; a roller cam-lifters is a good thing. Because flat tappet failures do happen and happen quite often during cam break-in / or soon thereafter. Those flat tappet Failures can be Very costly. Roller cam-lifters require virtually no break-in; nor do they require life-long diet of special oil and/or high-Zinc supplements (as do Most flat tappet cams).
Yes; roller cam-lifters are considerably more expensive (to purchase) than are flat tappet cam-lifters.
Are you risk-averse? Or, are you feeling lucky?
Pick your poison.
FWIW, if a project begins with a later sbc (later than C3 era); those motors either came OE w/ roller lifters or More readily accept less-expensive OE roller lifters.
For both environmental and political reasons, auto manufacturers universally adopted roller lifters decades ago; after recently REQUIRED catalytic converters were being ruined by the high-Zinc oils (which were typical for that era). That era is long-gone and so are Most of the high-Zinc oils.
Yes; roller cam-lifters are considerably more expensive (to purchase) than are flat tappet cam-lifters.
Are you risk-averse? Or, are you feeling lucky?
Pick your poison.
FWIW, if a project begins with a later sbc (later than C3 era); those motors either came OE w/ roller lifters or More readily accept less-expensive OE roller lifters.
For both environmental and political reasons, auto manufacturers universally adopted roller lifters decades ago; after recently REQUIRED catalytic converters were being ruined by the high-Zinc oils (which were typical for that era). That era is long-gone and so are Most of the high-Zinc oils.
Thread Starter
Drifting
Joined: Jul 2012
Posts: 1,255
Likes: 297
From: Slovenia, EU
2017 C3 of Year Finalist
Just got the word that my heads are done! 
2 valves were bent. Slightly.
My engine builder recommended this camshaft kit:
https://www.compcams.com/xtreme-ener...all-block.html
Anyone uses this cam?
2 valves were bent. Slightly.
My engine builder recommended this camshaft kit:
https://www.compcams.com/xtreme-ener...all-block.html
Anyone uses this cam?
Dr. Detroit
Joined: Mar 2012
Posts: 10,093
Likes: 4,017
From: New Braunfels Texas
Just got the word that my heads are done!
2 valves were bent. Slightly.
My engine builder recommended this camshaft kit:
https://www.compcams.com/xtreme-ener...all-block.html
Anyone uses this cam?
2 valves were bent. Slightly.
My engine builder recommended this camshaft kit:
https://www.compcams.com/xtreme-ener...all-block.html
Anyone uses this cam?
Jebby