Don Terrill’s Speed-Talk

rickb33x

So do port work with the 1.89 intake? will the head flow close to 7000 rpm?

rickb33x

706 with 2.00 intake and porting is what I was thinking but to what extent? exhaust is pretty much open and with little restriction.

rickb33x

We are allowed porting, bigger piston bore size(must use the 3.622 stroke though, rpm range is 3,200-6,800 I believe on a 3/8 dirt oval (7,000rpm pill).

rickb33x

Walter R. Malik wrote: ↑Tue Apr 06, 2021 11:20 pm What are the LS cylinder head rules...?

ANY O.E.M. 5.3L heads or do they need to be the Truck heads ...?

I gather any OEM LS head, and porting is allowed.

rickb33x

I can always run ethanol free gas. That's what I normal run.

rickb33x

What would be the ideal head for the 5.3 in this situation?
3/8 mile dirt track,
Likely run a E-85 gas, such as what's available through VP race fuels.
Max compression between 9.5:1-9.7:1

rickb33x

E-85 is legal, though I would likely get the E-85 from a source that I know it's the correct blend and not from a regular gas station.
It is a 3/8 mile dirt track so just need to figure out what gearing they are running since we have to run a rev limit of 7,000 rpms.

rickb33x

I'm a competitor. Only the stock cam, or CT525 cam in rules. Tri-Y aren't allowed in either class. They also have a muffler mandate to cut down decibals but not real restrictive(tube muffler maybe 8" in length. the B mod class with a regular race engine must use 2bbl, but a B mod with a 5.3 can use ...

rickb33x

So we have the 5.3 engine as an option for two different classes. 2300 lbs B Mod(max 2650 weight), or a stock car class which is 2950 lbs minumum. I'm looking at the overall cost so having back ups as an economical and from a future aspect as the engines are slowly gaining use in many racing classes...

rickb33x

Have used 1.265 springs and tech never complained. Valve covers with oil sprayers can be used. I've never had issues with the grooved pivot ball.

rickb33x

not wissota rules but thats an interesting read.

rickb33x

Sadly we are restricted to no more than 10.0:1 or below Krooser. Porting is allowed. I'm considering the cast iron powermaxx 185cc head thru Summit. I gather with a bit of work they are pretty decent alternative to Vortec(used and most likely cracked), or expensive vortec bowtie small runner heads. ...

rickb33x

My biggest concern is the 3/8" screw in stud rule in relation to the .584 lift on the intake. We are not allowed stud girdles. Plan to focus on getting the geometry as dead on as possible, and wondering if stud stress is relative to pushrod length. Screw-in 3/8" studs will have no problem if the ge...

rickb33x

My biggest concern is the 3/8" screw in stud rule in relation to the .584 lift on the intake. We are not allowed stud girdles.
Plan to focus on getting the geometry as dead on as possible, and wondering if stud stress is relative to pushrod length.

rickb33x

PRH wrote: ↑Thu Sep 24, 2020 3:13 pm
Must have cast iron cylinder heads, original valve angle and location.

Any aftermarket cast iron head with stock valve angle, and no valve size limitation

Don Terrill’s Speed-Talk

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