[Ericnova]

If they are actual Pro TopLine cylinder heads....those are very good cylinder heads, better than Dart.
PRoTopline was bought up by Racing Head Service (RHS) and they still sell the heads.

Exactly what intakes have you tried to fit??
Have you researched the head numbers to see which version of the head you have?? They made a range of sizes, from stock replacement to Full Race.

Performer RPM, not Air Gap.....Or Weiand Stealth....should be an easy fit. ideal intake for a street engine, stock or modified.

 

[Ericnova]

123 20002 oa 1926 1002 stamped on the front face. valve cover off, ProLine,,, 5 embossed. gotta go to work, i`ll look these up later,,,, thanx.

I can save you the trouble of looking it up, I've got the Pro Toplines catalog from 2002....

" 123 2000 20A " is listed as Pro Aluminum Lightning, 220cc intake runner volume, 72cc combustion chamber volume, 2.02"/1.6" valves as delivered but can go to as big as 2.10" intake valve.
They have a .100" raised roof intake port (that's how most all aftermarket heads get their bigger volume runners, raise the port roof).
That's why a standard Performer intake isn't going to fit.

220 cc intake runner is a pretty big head, recommended for 383-400+ cubic inch running 7500 rpm peak.

Sounds like maybe your trying to turn a race horse into a stable pony??!!

 

[Ericnova]

I forgot to add, Pro Toplines recommended intake manifold for this head is the Edelbrock #2925....which is the Super Victor. It was never meant to fit a stock port size Performer intake.
It also lists the as-cast flow numbers if you need them, just ask. Pretty solid numbers, its a good flowing head.