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Cam LSA question

6K views 23 replies 5 participants last post by  tjet 
#1 ·
I have a question regarding the lobe seperation angle on a cam.
Will a cam with 232* @ .050" with a 112 LSA have a similar idle as a cam with 224* @ .050" with 110 LSA?
 
#2 ·
nope. They are 2 completely different cams and will behave in two completely different ways.

There's a LOT more to a cam than LSA, and damn the man who passed a long the idea that it is the most significant number involved in cam timing- it is no more significant than duration or lift. They ALL affect the manner of a cam.
 
#3 ·
I want to run the biggest hyd flat tappet cam possible without changing the torque converter or gears. The stall on the tq converter is around 2500. I'd like to install a comp magnum 280H, but I think the 230 dur + the 110 LSA may be too choppy. I'm thinking it may behave better with a 112 LSA

(355, 10:1, Dart 200 heads, Streetmaster intake, Q-jet, Tri-y 1-5/8 headers w/2.5 pipes, 3.54 diff, 3500# truck)
 
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#11 ·
Will look into it. I'd like to stick with a single pattern cam if possible (single pattern has a more old school "rhythmic" sound unlike the dual pattern cams like my XE cam IMO) The streetmaster intake I have on my vette pulls harder than the Weiand 8004 I had on it, plus it has an oil fill tube which is a feature I need. Another intake option I may consider is an Edelbrock C-26 dual quad.

Trying to achive a 60's hotrod look & sound with this engine - it's going in my 59 Chev pickup
 

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#16 ·
Just to follow up, I got a reply from Comp Cams about getting their 280H Magnum with a 112 LSA ISO 110:

Tracey, we can help you with this for sure. We can grind that on what
ever LSA you would like. The 112 LSA will smooth the idle out a little...
And push the power band to the higher RPM side. It will also lessen the detonation threshold.

How much RPM are you looking for? Let me know and we will go from there. Thanks.


Please use the "reply" button so that I can keep track of the
conversation.

[name removed]
Technical Consultant

COMP Performance Group™
3406 Democrat Rd.
Memphis, TN 38118
 
#19 ·
Ive seen a couple non airgap RPM manifolds modified for a fill tube with the EGR in the tube (I think). Cool deal. I'd use a 300-36 manifold and a Holley. Or go Dual Quads. The 60s are my favorite era for Hot Rodding. You went from 283s to 350s; dual quads, tri-power, superchargers, turbochargers...Its wide open. That street master has to go though. As far as the cam; Im a UDHarold fan, or Id call Isky but thats personal preference. Dont forget the CherryBombs!
 
#21 ·
Hmm, so the streetmaster is incorrect for a 60's looking engine. When did Edelbrock make them?

I would have never guessed a single plane would help MPG :cool:

Wanna trade for a dual quad intake? I think my dad has a couple old AFB's in the garage

This is it
 

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#22 ·
torkers were very popular back in the early 70s/tarantula/scorpion,,,,,,back in the sixties,the z-28 intake was around but expensive,offenhauser had some unpopular intakes back then. The only intake I currently have is the holley street dominator,and its not impressive or retro.
 
#24 ·
The current engine has a torker, but it's on an Olds 455 that I installed in high school. It has a bent rod, so I'm replacing it with a 350. I would like to keep the Olds, but I can't justify the 9-11 MPG. (My 350 vette will get around 17 mpg cruising at 65) + rebuilding a sbc is waaay cheaper. The Olds also had an overheating issue I just couldn't fix either.
I am going to use the current Olds TH400 though with a Summit adapter
 

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