Engine ideas.
09-02-2020, 05:02 PM
#51
Supreme Member
iTrader: (14)
Join Date: Nov 2008
Location: Milwaukee
Posts: 2,003
Received 145 Likes
on
119 Posts
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: Engine ideas.
The FIRST manifold is primarily designed for the pre-87 bolt pattern heads (which is why I got the AFR 195's because if anything, it will fit better). But has the ability to bolt and seal to a Vortec. Any port misalignment (I'm sure there was some) was not noticeable either during assembly or on my dyno numbers using stock Vortec's. I think the variation is minor.
As for the low lift flow on the AFR's..... if it is in fact worse than a Vortec it doesn't seem to show up in any of the dyno charts comparing the two that I have seen. They seem to act almost identically till you get up higher in the RPM where you need that extra flow and then the AFR's just keep climbing while the iron Vortec falls off.
AFR is also now selling "budget, as-cast" versions of their heads - without all the CNC porting, etc. They are inexpensive and outperform a Vortec easily.
https://www.airflowresearch.com/195c...cylinder-head/
$477 each fully assembled with the same high quality parts used in the CNC versions. That's insanely cheap.
GD
As for the low lift flow on the AFR's..... if it is in fact worse than a Vortec it doesn't seem to show up in any of the dyno charts comparing the two that I have seen. They seem to act almost identically till you get up higher in the RPM where you need that extra flow and then the AFR's just keep climbing while the iron Vortec falls off.
AFR is also now selling "budget, as-cast" versions of their heads - without all the CNC porting, etc. They are inexpensive and outperform a Vortec easily.
https://www.airflowresearch.com/195c...cylinder-head/
$477 each fully assembled with the same high quality parts used in the CNC versions. That's insanely cheap.
GD
09-02-2020, 05:40 PM
#52
Supreme Member
Re: Engine ideas.
Lets hope the ports are in the right locations!
https://www.speed-talk.com/forum/vie...hp?f=1&t=60873
09-02-2020, 05:52 PM
#53
Member
Thread Starter
Join Date: Oct 2009
Location: Battle Ground
Posts: 190
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 Trans Am
Engine: 305
Transmission: 700R4
Re: Engine ideas.
Neat thread on post 44, skinny. For as little money as it will cost me I will do a before and after test of the ram air. Can't hurt, might help. So why not?
09-02-2020, 06:11 PM
#54
Supreme Member
Re: Engine ideas.
Indeed.
Despite being a carburetor guy and having a cowl hood (that was intended to used as a source of cold air) I'm intending to build what it takes to incorporate the TPI filter case to that carb.
I absolutely think it's the way to go.
Despite being a carburetor guy and having a cowl hood (that was intended to used as a source of cold air) I'm intending to build what it takes to incorporate the TPI filter case to that carb.
I absolutely think it's the way to go.
Thread
Thread Starter
Forum
Replies
Last Post