Stroker 445 with 428CJ exhaust - worthwhile?

[427LX]

Where have you guys been hiding?  The "Stock Appearing" racers as in F.A.S.T. have been running VERY well stock intake and exhaust manifolds with 2 1/2 inch exhaust systems as required
for years! They port them out to the max with grinding and extrude honing process.

[jayb]

FE exhaust manifolds do not respond well to the Extrude Hone process.  I've seen 428CJ exhaust manifolds tested before and after Extrude hone, and the engine picked up a whopping 5 HP.  The FAST guys make power with cubic inches and head and intake modifications.  The exhaust manifolds, on the FE anyway, are still a bottleneck.

My former trunk monkey Joel has a 700 HP FAST hemi that uses the stock exhaust manifolds, but the hemi exhaust manifolds are really free flowing, much better than any FE exhaust manifold.

[turbohunter]

IIRC Kugel was making new iron exhaust manifolds copied off the old Galaxie deals.
Wonder how those do?

[e philpott]

Galaxy manifolds won't fit shock tower cars

[turbohunter]

Oh yeah, Cougar
Duh

[mike7570]

OP, R J Sledge has a set of REF Tri-Y headers for sale on the Class Racer Forum. 

[thatdarncat]

IIRC Kugel was making new iron exhaust manifolds copied off the old Galaxie deals.
Wonder how those do?

They are supposed to be exact copies of the shorty cast iron headers, except they took off the choke heat protrusion. The results of those manifolds are in this great book - The Great FE Intake Comparo!

[turbohunter]

Never heard of it

[plovett]

Where have you guys been hiding?  The "Stock Appearing" racers as in F.A.S.T. have been running VERY well stock intake and exhaust manifolds with 2 1/2 inch exhaust systems as required
for years! They port them out to the max with grinding and extrude honing process.

I don't mean to freak out the concours guys, but maybe cut those 428 CJ exhaust manifolds in half and port them properly with a grinder?   Then weld them back together? 

paulie

[FE4SPDMustang]

Where have you guys been hiding?  The "Stock Appearing" racers as in F.A.S.T. have been running VERY well stock intake and exhaust manifolds with 2 1/2 inch exhaust systems as required
for years! They port them out to the max with grinding and extrude honing process.

I don't mean to freak out the concours guys, but maybe cut those 428 CJ exhaust manifolds in half and port them properly with a grinder?   Then weld them back together? 

paulie
The standard 67 exhaust "logs" are horrible. I was considering using the 68' CJ units and I was told that the port at the head couldn't be increased to get flow numbers enough to justify funds that would be expended on extrude hone or any other current process. I wound up with Hookers. I weigh 211 pounds and the car is slightly lower than stock because of the Arning drop I partially smashed the tubes. I was thinking about the JBA Tri-Y headers. Something will have to be done eventually.

[e philpott]

OP, R J Sledge has a set of REF Tri-Y headers for sale on the Class Racer Forum.

Not legal in FAST ,

[cheeser]

Ok, it appears I can make decent power with a stroked motor and good heads, with slight hit do to the CJ heads.  I believe my CJ manifolds are reproductions and thought about extrude honing as well...noticed there seemed to be minimal benefits, especially for the cost.

This combo of a stroker with nice heads and 428 CJ exhausts would be interesting to see on a dyno.

[FE4SPDMustang]

40-60HP is significant. 12% based on 500HP is quite a bit. I know the Tri-Y design lost some power over longtube as well. Tower cars are always problematic.

[cheeser]

40-60HP is significant. 12% based on 500HP is quite a bit. I know the Tri-Y design lost some power over longtube as well. Tower cars are always problematic.

I can’t disagree, but may be a choice some can live with to eliminate other impacts.

[Joe-JDC]

I spent the day today on the dyno with my little Y Block Ford.  It is a 346 cubic inch, iron head, 9.4:1 compression, and 228* @ .050" camshaft with .510" lift.  It made several pulls with 405 tq/402 hp on pump gas with 38* total timing.  750 Summit VS carb, and FPA '55 Thunderbird headers.  I had a set of '56 Ford exhaust manifolds, and Thunderbird exhaust manifolds that I ported and polished the interior, rounded the passages, opened up the flanges, etc., with 2' of 2" exhaust tubing bolted up to the flanges.  Lost 35tq, and 35 hp straight across four dyno pulls.  It was a simple test to verify the differences between the ported manifolds and a good pair of FPA headers.  I made 565tq/595hp with the same set of headers on my 375Y that I built for EMC in 2018.  Joe-JDC