I'm thinking about getting a custom grind cam for a 1987 305 TPI 5-Speed and can't decide which LSA to get... 112 or 114? Ideas?

 

That's not much information upon which to base a decision.

There are a lot of factors affecting cam profile, such as:

* What is the total duration of intake and exhaust lobes?

* What is duration at .050" lifts?

* What is the valve acceleration rate (ramp)?

* What is the maximum overlap you can tolerate?

* What is the desired RPM range of operation for peak power?

* Are emissions an issue?

* Is this a daily driver, super stock, or all-out race configuration?

* Do you need vacuum to apply your brakes or to satisfy engine controls such as a stock ECM?

Any additional information you can supply would be very helpful.

 

My car is a daily driver, basically stock 305 engine, 5-Speed w/3.45 gears. I plan on getting the heads worked, and maybe going to a larger intake valve. I have just started to look at the car's diagnostic port with a laptop PC, and plan to get into PROM burning in a few months. The off-the-shelf cam I'm interested in is a Crane 2032, P/N 104224.

I believe the LSA is 112
Lift: int. 452, ex. 465
@ .050: int. 214, ex. 220
Advertised: int. 270, ex. 276

I don't understand the ramp specs...

@.050 int. opens 0.0 BTDC, closes 34.0 ABDC, max. lift 107 ex. opens 47.0 BBDC closes (7.0) BTDC max. lift 117

I think I'd be better off getting a custom grind cam with a little more lift, but I still want to use the stock heads without any special machineing for more valve lift. And maybe I'd be smart to go with 114 LSA too? The "@ .050" durations on the 2032 look good to me. Oh, and passing smog is an issue, I live in California.

 

Here's a great off the shelf cam with more lift than the one you listed. it is computer friendly. I do not know about the smog though. Summit can tell you I'm sure. I ran it in my 305 5-speed and I liked it. Spun a bearing before I could get any times though.

http://store.summitracing.com/partdetail.asp?part=28925