Hey guys I just got a set of Fast Burn heads off ebay. There isn't must out their about them or build-ups of combos with them. Is anyone running these heads? What combo, car or really anything on how they perform?
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Hey guys I just got a set of Fast Burn heads off ebay. There isn't must out their about them or build-ups of combos with them. Is anyone running these heads? What combo, car or really anything on how they perform?
If these are GM part number 12464298, you have the following:
“Aluminum Fast Burn Cylinder Head Assembly”
They’re CNC-machined aluminum cylinder heads from GM Performance. They will fit all small blocks (283 – 400) made between 1958 – 2000. I hope that they are “stock” as there is no performance to be gained from any porting/polishing activity and in the hands of less than an expert; any work will actually degrade the performance. They also will have the GM and flaf logo on the ends (see below).
They're drilled and tapped for early and Vortec manifolds and you can use flange-mount or center bolt-style valve cover. Reports say that these heads, with cam #12370847 (Hydraulic Roller Cam - 234/242 duration - 539/558" lift), intake #12496822 (Vortec Eliminator) with a 750 cfm carb on a 383 produce 500 plus horsepower.
They’re pretty much a bolt-on head. No muss-no fuss. Should be a good set for just about any small block (except 305).
Have Fun,
Glenn
On my set of fast burns, we had to move the exhaust bolt holes up about 0.180" in the heads to make the exhaust ports match the headers..... suggest you do a gasket match comparison of your headers with the heads.
Also, the bolt pattern in the end of the head for the accessory mount might be different from what you have now.
mike in tucson
On GMPP's website it says that 0.530 is the max valve lift without mods. Is this becuse the retainer hits the seal (like vortec heads) or are the valvesprings fully compressed?
Mine is running the GM Hot Cam 24502586
with 1.6 rockers. Lift is advertised at
@ 1.5 ratio lift is 0.492”/0.492”
@ 1.6 ratio lift is 0.535” /0.525”
Have not had a problem (that I know of)
mike in tucson
Wow - I see that on their web site (0.530 max). I know that Sallee builds a 383 with the above parts.
http://www.sallee-chevrolet.com/Chev...leeZZ450HP.cfm
They may, of course, relieve the spring bases. Perhaps others have some "hands on" with larger cams using the Fast Burn heads.
Just saw your post Robot - and there we have the real life example of a lift just beyond 0.530 without issues.
I had the fast burn heads on a mild 406 in an 86 Iroc. The best it ran was an 11.82. They are a decent head but not the greatest sbc head. You need a vortec style intake as well.
I plan on building a 406. There is a 355 in the car. Does anyone think i can make 500 horsepower with the 355 at 9.5:1 compression, AirGAP intake headers and big cam(how big TBD with answers to question). Also a 750 holley and nothing but an alt. hanging off the front? open to opinion...
no problem with nitrous....
i want to go straight up.
You'll need AFR heads to get that kind of hp without nitrous.
Quote:
Originally Posted by rumrumm
Yes as you said AFR heads and a healthy solid roller should get you 500 na.