since Tracy Dennis announced the "game changer" SR20 heads. So what's the latest and greatest using these 20 degree heads, who has what, how many cubes, built by who, making how much HP and running what in a pipe rack at what weight?

If I had to, I would call par or sdpc. Par engines seem to be fast, but Britt Cummings has one from sdpc I believe that runs in the 450 range which is about as fast as I would want to go.

PAR has their own 20 degree port they are putting in bare castings that seem to do better than the sr20 head. they call it elite 20. he sells a lot of them for what it is worth. he builds a lot of 598 20*.

ep-Duggins has worked as hard as anybody on improving the 20 degree stuff

I have a couple friends running 4.30's at 157ish both with 615's

The 615 short deck is Probably PAR’s biggest seller...I like um a little bigger...

How much bigger and why do you like the 20 degree over the 9 degree?

9 degree is a great motor but you just can’t beat the 20 stuff out there now....if weight wasn’t a issue the 9 would eat the 20 up but it doesn’t not much faster at all an considerably more expensive....but the main reason I would highly recommend the 20 is parts are readily available at the track....nobody has a 9 degree let alone parts....

But if you went 9 degree I would go the X BLOCK route now it is very impressive

I've seen some pretty nice variations of the 20's at Rick's shop. You know what SR stands for. Also RIP Mr Dennis. He was a good guy.

Par 632 SR20
1975 LB Mullis 4 Link 3197 M/T 4:10
4.49 in decent air not great air cecil county
was best
super consistant

quote:

Originally posted by 1320racer:
How much bigger and why do you like the 20 degree over the 9 degree?

Sent u a PM

If I were doing a 20 degree I would look at Shafiroff’s 20 degree heads. They use standard valve covers and a standard manifold.

Vern, Shafiroff always has the best advertised prices but when you compare apples to apples the real costs of his engines is within a few dollars of his competitors. That said, you don't see many of his engines in use in division 1.

quote:

Originally posted by TOP38:
Sent u a PM

you got mail

622 PAR in a 1800 pound Racetech. For comparison, was dialed .38 the week you were at 42 for the ACE race.

quote:

Originally posted by WHOMPWHOMP:
9 degree is a great motor but you just can’t beat the 20 stuff out there now....if weight wasn’t a issue the 9 would eat the 20 up but it doesn’t not much faster at all an considerably more expensive....but the main reason I would highly recommend the 20 is parts are readily available at the track....nobody has a 9 degree let alone parts....

The concession for using the 9 degree heads is about 30 lbs. but they are at least 60HP better depending on who's port in the head and whether you run conventional, 20 degree, 9, 11, 12, 14 degree spread ports, you should have spare rockers, pushrods and valve springs.

I'm not familiar with the X block.

quote:

Originally posted by TheBlueTruck:
I've seen some pretty nice variations of the 20's at Rick's shop.

Rick has an 18 degree "conventional" head.

I ran the shyt out of mine at the DRR at HUNTSVILLE....I broke a couple of the offset rockers but only after about 300 runs...other than that no problems...but I did start breaking the shyt out ring an pinions while running it which seemed strange..

how big is your 20 degree engine, how much HP doers it make and what ET/MPH does it run at what weight and on what fuel?

As far as I know, KB had the quickest/fastest 20 degree engine in dragster in the country running 6.60s @ 198 and has also ran 190 in Super Comp BUT it is no 615 or even a 632 and his car is very light. I'm told that this engine is now in Cameron Manual's car.

X14 fuel...1895lb. mine is a 638... been 4.32...making some changes to it now...camshafts have came along way since these heads started out.....an yes Manuel did buy it....KB going back to the popular 615’ as far as I know as of now....he runs the shyt out of stuff like myself...

KB as driven my stuff an will pick up .08 min with him...