487X vs. 487 vs 993 SBC Cylinder Heads

[njk53]

John you have a PM

[Mike Taylor 3601]

The flow bench doesn't tell the whole story,but is pretty good start, myself I have checked 882,624 for 350's 450,416 for 305's 743 for 4.3 and by flow numbers are almost identical.
.450'' lift is highest lift went to these were junkyard heads cleaned and checked,we checked a dozen or more 882, have checked close to that many 450,416 ,have only checked a couple 624 and 4.3 heads.
165-175cfm @25'' around .400 lift
Mike Taylor 3601

[ron mattson]

Call me I have lots of parts for that combo
And have done lots of testing. 218-391-8559

[ron mattson]

1 those heads are all good and very similar
In both flow and hp.
2 the 487x is allowed but there is more of
A difference between good castings and
Bad castings than there is from one casting
Number to another.
3 horsepower can vary greatly from one
To another but 410- 430 depending on the
Dyno will get you down the track very well.
I have heard of some making more but the
Best dyno is 1320 ft long and it does not matter
What the dyno sheet said it made its the
Et ticket that does! Hope that answered your
Questions.

[JRyan]

AMEN to the 1320 dyno Ron. We have three different Olds engines for our SS/NA Cutlass, all very different combinations. NONE of the engines have been on a real dyno, and I think most would say our car runs OK.

Jerry

[njk53]

If 487X, 487, & 993 share similar air flow capacity, in your opinion which casting is the best choice regarding casting integrity (robustness), resistance to cracks, core shift, etc. is the best of the bunch?

[Dwight Southerland]

Flip a coin.