Recent content by cookietruck

Valves are closed for a leakdown. I wouldn’t expect bad guides to show up in that test. Is this the thread where the valve stem seals for two cylinders weren’t seated on the guides?

Can you temporarily make the idle too rich to see if it smooths out the 1600-1800 rpm range? Also, maybe try a different ignition box?

The new zealand castings. Indy x head. 1213 gasket.

Yeah. 2nd cut was def a waste. Seems the sweet spot with these heads is a nice valve job, back cut and a bowl blend. (And the promaxx and AFR heads already have that) And if you’re really on a budget try to score the complete SM heads 40% off and run ‘em. Need more than that just go straight...

Lolz

Central texas

141200 converter. New in box. Got a little looser converter to use which should work better with my cam. I was thinking this would be similiar to factory histall converter. Should be 24-2600stall. 11”. “1000rpm over stock”. 450 plus shipping.

Yeah true. If you really want steel heads. Send them to KG engines for the cnc program. $850. Plus valve job and guides etc…$1400 in for machine work alone. Seems like no matter what option you choose, to get heads in this bracket it’s gonna be $1700-2500.

Did you use a backcut valve? The promaxx and AFR both show about 191cfm at .300” lift ok their websites. I thought the speedmaster would be further down than this. Seems like pretty much a wash.

I have a new in box TCI breakaway converter i grabbed on sale because I figured it would work well with a 280 cam and 3.23 gears. It’s be 11” and should be “1000 rpm” over stock…sounds like a factory 340 hi stall or something similar. Didn’t want anything too mushy. Anyway, pm me if you want...

I would wait til november sales and either 1. Get speedmaster heads complete for $750 Or of budget allows 2. Promaxx heads (20 or 30% off) Def get an airgap copy intake. Run a cam that will work well with 3.23 gears. 268-270 duration range and tighter lsa. Little looser converter if possible...

I would run a step smaller cam than either of those. Measure everything to make sure you will have good compression.

What end gaps are you trying to fit?

Yep All the file fit i see for 4.07 bore are 1/16”

These work? https://www.summitracing.com/parts/hsn-2m139070