I remember someone (Black Echo I think) saying that Holley 502-7 (670cfm 4.3 truck TB) was a better one to use than the 502-6
(87-89 5.7L V8 truck). Here's my problem. I have a 400ci small block and I want a TB big enough to flow enough air to feed it (the stock 350 L05 ain't gonna cut it). I am converting to multipoint, so all I care about is the TB's airflow, not its injectors (not going to be using them). So which would be better for my application?




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Kelly 'GhoSSt' Rosato
1996 Impala SS, 383 LT4 (14.65 up here, 13.24 lower)
1984 Firebird, +.060 350 (Vortech Heads, HOT Cam, and schtuff)
1993 Caprice, 5.7 TBI (stock . . . FOR NOW)

"And if you wrong us, shall we not revenge? Revenge. The villany you
teach me, I will execute, and it shall go hard but I will better the
instruction."

Shylock in Act III, Scene I of 'Merchant of Venice' by William Shakespeare

 

Did you see the TB unit the Grumpy posted for sale?
https://www.thirdgen.org/messgboard/...ML/000282.html

 

I think that the injectors are the only difference between those two part numbers. I once e-mailed Holley about the differences, the worthless e-mail that I got back said something like "the injector sizes are different, the connectors might be different". Duh, I already knew that.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

Yeah, I saw that when he first posted it. Very different from the TBI tb. I'm not interested in doing that much work.

Kelly 'GhoSSt' Rosato

 

id like to see a pic of that grumpy., if you read this.