bosco022

I had an old ASA National Tour Series LS1 laying around and a friend wanted to use it for his tube frame SCCA Camaro road race build.
He wanted to go with a carb version, so I took it to Byron Koury Racing Engines in Deland, Fl.

Byron checked the motor out and decided it was in good condition and a low hour unit so a rebuild was not necessary.

The following was done however:

* new GM LS2 type timing chain
* upgraded aftermarket pushrods
* new LS6 valve springs
* Comp Cams rocker trunion kit
* Edelbrock performer RPM intake manifold
* Holley 750 Carb

These motors of course came with the GM .525/.525 226/236 110 lsa cam and a single stage dry sump set up. Also ATI damper and Moroso dry sump pan. Bone stock 853 heads.

On a known "STINGY" Superflow engine dyno it made the following:

434 lbs ft of torque at 3700
455 HP at 6500

At 3500 rpm it was already making 426 torque and held 400 plus until 5900.

Actually power had not fallen off at 6500, so it could have been a small bit better.

By my experience these mild LS1 make excellent, cheap road race power with very good reliability. They run even better than the numbers would suggest.

Some earlier tests we have done show they made a bit more torque with the stock EFI and bit less HP.

bosco022

Also we used the Daytona Sensors system for ignition.

rithsleeper

Awesome numbers. Good info for someone seeing about engine choices.

bosco022

I remember we did a nearly identical motor a couple years ago except for it had 243 heads instead of the 853's. It made 465 HP and the same torque.

This would suggest that the 243's were only about 10 HP better than the 853's that many folks junk. By my experience, all of the LS cathedral port heads flow very well.

REVHARD

always good results with the ASA cam in LS1/LS6's. I really wonder why when doing a search that I don't see more setups and dyno graphs using this cam and combo. GM did all the homework for us to provide a killer and reliable setup and nobody seems to run it?

crimlwC6

I plan on installing it this summer (downtime for Phoenix). I almost bought the Howard cam remake of the ASA until I did some research and the lobe 'improvement' makes for harsher ramp up rates and potentially kills the valvetrain. Thoughts on whether it is better to replace the springs or just let it be and install the cam? 04 LS6 from a CTSV with 2 seasons on the motor, completely stock.

REVHARD

Yes, the Howards version does not have the ramp rate of the factory GMPP ASA cam. I have been contemplating adding a cam myself. No other reason other than boredom. I would like a few more ponies No matter how much I want to wonder towards a G5x1 or some other "smaller" newer style cam that's similar. I always stray back to the ASA for its good reliable power, solid torque curve and ramp rate.

Have you made a decision on cylinder heads? I plan to get my factory 243's cnc'd. I'm just undecided on a spring. My budget allows me to go to something better like a PSI 1511 or a PAC 1218 with a trunion upgrade.

bosco022

Another "easy on the valve train", good torque road race cam is the ISKY 280/290 LS cam. It is something like .535/.540 232/242 on a 110. Reportedly makes about 10-15 more HP than the ASA cam with similar drivability.

Pretty sure this is the Spec Trans Am 2 cam provided by Schwanke to TA teams.